neptronic SKS4 Steam Steam Humidifier User Manual

neptronic SKS4 Steam Steam Humidifier

Specifications

• Product: SKS4 Steam to Steam Humidifier

• Model: SKS4-ESL-230302 (V2.03)

• Installation Instructions and User Manual: 4011008

• Designed for humidification use

• Main water supply: Mains, reverse osmosis, de-mineralized or
  partially softened water

• Maximum water pressure: 70 psig (480 kPa)

• Manufacturer: Neptronic

• Manufacturer Location: Montreal, Canada

Product Usage Instructions

Safety Precautions
When installing the steam supply, only skilled and qualified technical personnel should perform the work. It is the customer’s responsibility to ensure the suitability of the technical personnel. Local regulations regarding steam installations should be observed.

All electrical installation work should be carried out by skilled and qualified technical personnel, such as an electrician or a technician with appropriate training. The customer is responsible for ensuring the suitability of the technical personnel. Local regulations regarding electrical installations should be observed.

Health & Safety

To prevent the growth of Legionella and similar conditions, users are required to:

• Follow correct use instructions
• Use the humidification system only for its intended purpose
• Ensure the SKS4 electrical panel access door is always closed to prevent accidental access to live electrical parts
• Use mains, reverse osmosis, de-mineralized or partially softened water as the water supply
• Do not introduce any other fluid or chemical into the system without consulting Neptronic or its authorized distributor
• Ensure the water supply does not exceed the maximum pressure of 70 psig (480 kPa) and complies with local regulations

Installation Instructions

Refer to the provided Installation Instructions and User Manual (4011008) for detailed installation steps and guidelines.

Correct Use

The SKS4 Steam to Steam Humidifier is designed specifically for humidification use. Any other application is not considered appropriate for the intended purpose. The manufacturer cannot be held liable for any damage resulting from incorrect use.

Access
It is important to never leave the SKS4 electrical panel access door open to avoid accidental access to live electrical parts. Always ensure the access door is closed securely.

Water Supply

The Neptronic systems are designed to be used with mains, reverse osmosis, de- mineralized, or partially softened water. Do not attempt to introduce any other fluid or chemical into the system without consulting Neptronic or its authorized distributor. The water supply must not exceed the maximum pressure of 70 psig (480 kPa) and must comply with local regulations.

FAQ

Q: Can I use this humidifier for purposes other than humidification?
A: No, the SKS4 Steam to Steam Humidifier is designed only for humidification use. Using it for other purposes is not considered appropriate and may result in damage.

Q: What type of water should I use with this humidifier?
A: The humidifier is designed to be used with mains, reverse osmosis, de- mineralized, or partially softened water. Do not introduce any other fluid or chemical without consulting Neptronic or its authorized distributor.

Q: What is the maximum water pressure allowed for this humidifier?
A: The maximum water pressure should not exceed 70 psig (480 kPa).

Steam to Steam Humidifier

SKS4 Series Installation Instructions and User Manual
4011008
READ AND SAVE THESE INSTRUCTIONS
SKS4-ESL-230302 (V2.03)

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Safety
Steam Supply
All work concerned with steam supply installation MUST only be performed by skilled and qualified technical personnel. The customer is always responsible for ensuring the suitability of the technical personnel. Please observe the local regulations concerning the provision of steam installations.

Electricity
All work concerned with electrical installation MUST only be performed by skilled and qualified technical personnel, such as an electrician or a technician with appropriate training. The customer is always responsible for ensuring the suitability of the technical personnel. Please observe the local regulations concerning the provision of electrical installations.

Health & Safety
Neptronic has considered the aspects of the design of their humidification systems to reduce as much as possible the risk of Legionnaires’ disease and other similar conditions, but it is important that users are also aware of their responsibilities. To prevent the growth of Legionella, users are required to:
· Avoid water temperature that favours the growth of Legionella (68 to 113°F [20-45°C]). · Avoid water stagnation.
· Clean and disinfect the humidification system.
· Have a competent person carry out a risk assessment of the water system supplying the humidifier, to ensure that the water supply is of an acceptable quality.

Correct Use
Neptronic systems and its products are designed only for humidification use. Any other application is not considered appropriate for the intended purpose. The manufacturer cannot be made liable for any damage resulting from incorrect use.

Access
The SKS4 electrical panel access door MUST never be left open, in order to avoid accidental access to live electrical parts.

Water
Neptronic systems are designed to be used with mains, reverse osmosis, de- mineralized or partially softened water. On no account must a user attempt to introduce any other fluid or chemical into the system without first consulting Neptronic or its authorized distributor. Water supply must not exceed the maximum pressure of 70 psig (480 kPa), or the pressure limits laid out in the Installation Instructions and must comply with local regulations.

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Foreword

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Neptronic Company Overview

Founded in 1976, we’re a private corporation that designs, manufactures and distributes products for the HVAC industry. Our product line includes intelligent controllers, electronic actuators, actuated valves, humidifiers and electric heaters.

Our products are designed and manufactured by over 250 dedicated employees in our 7,500 m2 (80,000 ft2) state-of-the-art facility located in Montreal, Canada. Using a vertical integration model, our entire manufacturing chain is under one roof, from software and hardware development, to SMT circuit board assembly, to sheet metal fabrication, to product testing, ensuring that our products are engineered to last.

We currently hold several national and international patents and with our continued commitment to research and development, we provide innovative products and technologies for the ever-evolving challenges of the HVAC industry. Exporting over 70% of our sales, we have an exclusive distribution network around the globe that provides comprehensive solutions to our worldwide customers.
About the Manual
These installation and operation instructions have been developed to facilitate the installation of the SKS4 humidifier.
· The strict application of these instructions will ensure the conformity of your installation and operation as per the manufacturer’s recommendations.
· The application of these instructions is one of the conditions for the application of the warranty.
· The application of these instructions does not ensure, at any time conformity to procedures, regulation or local codes, regarding electric installation and connection to local water supply.
This product has been declared conform to applicable Canadian, American and European standards.
2021©: All rights reserved. This document cannot be reproduced totally or partially by any means whether, electronic, mechanical, photocopy, recording or other, without prior written authorization of Neptronic.
General Warranty
This product is subject to the terms and conditions described at http://www.neptronic.com/Sales-Conditions.aspx.

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

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Overview

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Handling and Lifting

Lifting or handling MUST be carried out by trained and qualified personnel. Ensure that the lifting operation has been properly planned, assessed for risk and that the equipment has been checked by a competent Health & Safety representative, and effective control measures are in place.
It is the customer’s responsibility to ensure that the operators are trained in handling heavy goods and to enforce the relevant lifting regulations.
The SKS4 humidifier MUST be handled and lifted with care at all times and remain in its original packaging for as long as possible, prior to installation.
The SKS4 humidifier package may be carried using a forklift from the underside. Exercise caution before lifting to ensure that the load is balanced.
Lifting of the SKS4 humidifier MUST always be carried out using the appropriate Neptronic Lifting bracket. The lifting sling angle must be greater than 30° to the horizontal. Refer to Dimensions and Weight section for system dry weights.

Slide lifting flap here
Illustration 1 – SKS4 Humidifier Lifting Bracket
Unpacking
The SKS4 humidifier is shipped inside carton boxes or in a wooden crate. Remove packing and skids prior to commissioning.

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List of Accessories Supplied

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

The following accessories are supplied with the SKS4 humidifier: · 2 adjustable collars per steam outlet for the connection of the steam hose. · 1 strainer (option). · 1 actuated control valve (AM060 actuator with globe valve) (option). · 1 float and thermostatic steam trap for the condensate return (option). · 1 Installation Instructions and User Manual.
Other Related Documents
· Wiring diagram · Start-up check list · BACnet Communication Module User Guide (for humidifiers with BACnet option) · Modbus Communication Module User Guide (for humidifiers with Modbus option)

Technical Specifications

SKS4 Nomenclature

Model

Maximum Capacities

Heat Exchanger
Type

Voltage Code

SKS4 – 1 2 5 0 – SLP A

Available maximum capacities in lb/h or kg/h at maximum pressure/temperature

A=120 B=208

Available voltages (Vac)

C=240

Code SLP

Material & Pressure Range of Heat Exchanger
Stainless Low Pressure

Illustration 2 – SKS4 Humidifier Nomenclature

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Steam Output Capacities

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Table 1 – Stainless Steel Heat Exchanger

Model*

Nb of Heat Exc.

Output Steam Capacity (lb/h) [kg/h] for Supply Steam Pressure (2)

5 PSI

8 PSI

10 PSI 12 PSI

15PSI

[34.5kPa] [55.1kPa] [68.9kPa] [82.7kPa] [103.4kPa]

SKS4-050-SLP

1

17 [8]

27

33

40

[12] [15] [18]

50 [23]

SKS4-100-SLP

1

33 [15]

53 [24]

67 [30]

80 [36]

100 [45]

SKS4-130-SLP

1

43 [19]

69 [31]

87 [39]

104 [47]

130 [59]

SKS4-190-SLP

1

63 [28]

101 [46]

127 [57]

152 [69]

190 [86]

SKS4-290-SLP

1

97 [44]

155 [70]

193

232

290

[87] [105] [132]

SKS4-390-SLP

1

130 [59]

208

260

312

390

[94] [118] [142] [177]

SKS4-500-SLP

1

167

267

333

400

500

[76] [121] [151] [182] [230]

SKS4-690-SLP

1

230 [104]

368 [167]

460 [209]

552 [251]

690 [314]

SKS4-950-SLP

1

317 [144]

507 [230]

633 [287]

760 [345]

950 [432]

SKS4-1250-SLP

2

417 [189]

667 [303]

833 [378]

1000 [454]

1250 [568]

Steam Outlet Qty & Ø (in) [mm] (1x) 2” [51] (1x) 3” [76] (1x) 3” [76] (1x) 3” [76] (1x) 4” [100] (1x) 4” [100] (1x) 5” [125] (1x) 5” [125] (2x) 4” [100] (2x) 5” [125]

Note: (*) In-between capacity models are available upon request to factory.
1 – Power supply can be 120Vac 1.5A, 208Vac 0.75A or 240/250Vac 0.75A (60Hz).
2 – Raw steam pressure at actual point of connection to humidifier. 3 – Maximum static duct pressure is 5” w.c. [1.250 kPa]. For higher static duct pressures, please consult Neptronic or its authorized distributor.

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Dimensions and Weight
Standard Humidifier
A B
G

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

E

6″ (15cm)

C H

D

I

F

2nd Steam Outlet on SKS4-950 & 1250
Control Panel
Raw Steam Inlet
Condensate Return Outlet
Disconnect Switch Water Supply Inlet Pan Drain Outlet Main Drain Outlet

Illustration 3 – SKS4 Humidifier Dimensions

Table 2 – Dimensions and Weight (Stainless Steel Heat Exchanger) Dimensions (in) [cm]

Model

A

B

C

D

E

F

G

SKS4-050-SLP SKS4-100-SLP SKS4-130-SLP SKS4-190-SLP SKS4-290-SLP SKS4-390-SLP SKS4-500-SLP SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP

19.8 [50.3] 19.8 [50.3] 19.8 [50.3] 22.9 [58.2] 22.9 [58.2] 27.6 [70.0] 27.6 [70.0] 30.9 [78.5] 30.9 [78.5] 30.9 [78.5]

45.8 [116.3] 45.8 [116.3] 45.8 [116.3] 45.7 [116.2] 45.7 [116.2] 58.6 [148.9] 58.6 [148.9] 58.6 [148.9] 58.6 [148.9] 58.6 [148.9]

26.2 [66.5] 26.2 [66.5] 26.2 [66.5] 29.4 [74.7] 29.4 [74.7] 27.3 [69.3] 27.3 [69.3] 34.3 [87.1] 34.3 [87.1] 42.5 [108.0]

43.5 [110.5] 43.5 [110.5] 43.5 [110.5] 46.8 [118.8] 46.8 [118.8] 44.6 [113.3] 44.6 [113.3] 51.7 [131.2] 51.7 [131.2] 59.9 [152.1]

7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.2 [18.2] 7.2 [18.2] 8.1 [20.6] 6.6 [16.8] 6.6 [16.8]

2.4 [6.0] 2.4 [6.0] 2.4 [6.0] 2.3 [5.8] 2.3 [5.8] 4.1 [10.5] 4.1 [10.5] 4.2 [10.6] 4.2 [10.6] 4.1 [10.5]

11.7 [29.8] 11.7 [29.8] 11.7 [29.8] 11.4 [29.0] 11.4 [29.0] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2]

1st Heat Exc. H1 I1
13.4 [34.0] 10.7 [27.2] 10.6 [26.9] 7.9 [20.1] 10.6 [26.9] 7.9 [20.1] 11.0 [27.9] 7.8 [20.0] 11.0 [27.9] 7.8 [20.0] 11.7 [29.7] 8.0 [20.3] 11.7 [29.7] 8.0 [20.3] 13.2 [33.5] 9.5 [24.1] 13.2 [33.5] 9.6 [24.3] 12.4 [31.4] 8.8 [22.2]

2nd Heat Exc. H2 I2 –
24.0 [60.8] 20.4 [51.9]

Weight (lb) [kg]

Empty

In Operation

255 [116] 265 [120] 270 [122] 310 [141] 315 [143] 395 [179] 400 [182] 470 [213] 475 [215] 570 [259]

457 [207] 487 [221] 484 [220] 578 [263] 616 [280] 828 [376] 822 [373] 1102 [501] 1168 [531] 1574 [715]

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Humidifier with OSHPD Special Seismic Certification Preapproval (OSP)

A

E

6″ (15cm)

2nd Steam Outlet on SKS4-950 & 1250

B
Control Panel

C D

Raw Steam Inlet

G

H I

F

Use 12x ½” (12mm) bolts and

washers (not supplied) to secure

J

the humidifier to the floor.

Illustration 4 – OSHPD Humidifier Dimensions

Table 3 – OSHPD Humidifier Dimensions and Weight (Stainless Steel Heat Exchanger)

Model A

SKS4-050-SLP SKS4-100-SLP SKS4-130-SLP SKS4-190-SLP SKS4-290-SLP SKS4-390-SLP SKS4-500-SLP SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP

19.8 [50.3] 19.8 [50.3] 19.8 [50.3] 22.9 [58.2] 22.9 [58.2] 27.6 [70.0] 27.6 [70.0] 30.9 [78.5] 30.9 [78.5] 30.9 [78.5]

Dimensions (in) [cm]

B

C

D

E

F

G

45.7 [116.2] 45.7 [116.2] 45.7 [116.2] 45.7 [116.2] 45.7 [116.2] 58.7 [149.1] 58.7 [149.1] 58.7 [149.1] 58.7 [149.1] 58.7 [149.1]

26.2 [66.5] 26.2 [66.5] 26.2 [66.5] 29.4 [74.7] 29.4 [74.7] 27.3 [69.3] 27.3 [69.3] 34.3 [87.1] 34.3 [87.1] 42.5 [108.0]

30.1 [76.5] 30.1 [76.5] 30.1 [76.5] 33.3 [84.6] 33.3 [84.6] 31.2 [79.2] 31.2 [79.2] 38.2 [97.0] 38.2 [97.0] 46.2 [117.3]

7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.1 [18.1] 7.2 [18.2] 7.2 [18.2] 8.1 [20.6] 6.6 [16.8] 6.6 [16.8]

2.4 [6.0] 2.4 [6.0] 2.4 [6.0] 2.3 [5.8] 2.3 [5.8] 4.1 [10.5] 4.1 [10.5] 4.2 [10.6] 4.2 [10.6] 4.1 [10.5]

11.7 [29.8] 11.7 [29.8] 11.7 [29.8] 11.4 [29.0] 11.4 [29.0] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2] 11.9 [30.2]

1st Heat Exc. H1 I1
13.4 [34.0] 10.8 [27.4] 10.6 [26.9] 8.0 [20.2] 10.6 [26.9] 8.0 [20.2] 11.0 [27.9] 7.8 [20.0] 11.0 [27.9] 7.8 [20.0] 11.7 [29.7] 8.0 [20.3] 11.7 [29.7] 8.0 [20.3] 13.2 [33.5] 9.5 [24.1] 13.2 [33.5] 9.6 [24.3] 12.4 [31.4] 8.8 [22.2]

2nd Heat Exc. H2 I2 –
24.0 [60.8] 20.4 [51.9]

Condensate Return Outlet
Disconenct Switch
Water Supply Inlet
Pan Drain Outlet Main Drain Outlet

Weight (lb) [kg]

J

Empty

In Operation

22.3 [56.6] 22.3 [56.6] 22.3 [56.6] 25.3 [64.3] 25.3 [64.3] 30.0 [76.1] 30.0 [76.1] 33.3 [84.7] 33.3 [84.7] 33.3 [84.7]

255 [116] 265 [120] 270 [122] 310 [141] 315 [143] 395 [179] 400 [182] 470 [213] 475 [215] 570 [259]

482 [219] 487 [221] 484 [220] 578 [263] 616 [280] 828 [376] 822 [373] 1102 [501] 1168 [531] 1574 [715]

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Weather Proof Enclosure

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Raw Steam Inlet Condensate Return Outlet

Water Supply Inlet Drain Outlet

Steam Outlet

A

D

C
Power Supply and Electrical Controls

B

E

Illustration 5 – Weather Proof Enclosure Dimensions

Table 4 – Weather Proof Enclosure Dimensions and Weight (Stainless Steel Heat Exchanger)

Dimensions (in) [cm]

Weight (lb) [kg]

Model

A

B

C

D

E

Empty

In Operation

SKS4-050-SLP

SKS4-100-SLP

SKS4-130-SLP SKS4-190-SLP SKS4-290-SLP

46.1

45.9

51.5

85.2

[117.2] [116.6] [130.9] [216.5]

84.6 [214.9]

SKS4-390-SLP

SKS4-500-SLP

SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP

50.2 [127.5]

50 [127]

72.5

85.2

84.6

[184.2] [216.5] [214.9]

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555 [252] 565 [256] 570 [258] 610 [277] 615 [279] 695 [315] 700 [318] 870 [394] 875 [396] 970 [440]

757 [343] 787 [357] 784 [356] 878 [399] 916 [416] 1128 [512] 1122 [509] 1502 [682] 1568 [712] 1974 [896]

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Installation Overview

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Installation Method Statement
WARNING: Risk of electric shock. Disconnect the appliance from electric supply before commencing installation. Note: All installation work must conform to local codes and regulations.
All work related to the installation of the SKS4 humidifier MUST only be performed by skilled and qualified technical personnel (e.g. electricians, plumbers or technicians with appropriate training). The customer is responsible for ensuring their suitability. For the installation of the SKS4 humidifier and its associated components, no special tooling is required above that of a fitter’s toolkit.
Installation Steps
Step 1: Unit Positioning and Mounting Step 2: Steam Distribution Pipe Installation Step 3: Raw Steam Supply Connection Step 4: Water Supply Installation Step 5: Water Drain Connection Step 6: Electrical Supply Connections Step 7: Electrical Control Connections
Clean Steam Outlet(s)
Control Panel

Power Supply and Electrical Controls
Main Drain Outlet Pan Drain Outlet
Water Supply Inlet Legs (Optional)

Illustration 6 – SKS4 Humidifier Overview

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Step 1 – Unit Positioning and Mounting
Location
WARNING: Failure to follow these guidelines will void the warranty.
Consider the following points before deciding the location for the SKS4 humidifier: · Plan a location that is easy to access and permits an easy inspection and servicing of the humidifier. · Do not install the humidifier where failure of the appliance could cause damage to the building structure or to other expensive equipment. · Ensure that the location is well ventilated and that the ambient temperature is less than 86°F (30°C). · For humidifiers having the weather proof enclosure, ensure that the humidifier is installed in a location in which the outside temperature lies between -40°F (-40°C) and 122°F (50°C). · Consider the total steam line length between the humidifier and the steam distributor based on the steam line material type: o For flexible steam hose, total steam line must not exceed 16 feet (5 meters). For longer distances, use insulated hard piping. o For insulated hard piping, the total steam line is determined by the humidifier capacity: one equivalent foot for each lb/hr capacity of the humidifier (0.67 m for each kg/hr), with a maximum of 50 feet (15 m). For longer steam line runs, consult factory. · The SKS4 humidifier must be installed in a way that ensures that the steam hose length is kept to the shortest possible length. · The SKS4 humidifier must be installed with provision for the steam supply piping connections and steam condensate trap installation.

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Positioning

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

· The SKS4 humidifier can be provided with adjustable legs (optional) in order to ensure proper level when installed directly on the floor. Provide a level, solid foundation for the humidifier and ensure that the floor beneath the humidifier is water proof to withstand any water spillage during servicing or in the event of a problem. Ensure that the humidifier is properly attached through its legs using anchors to the floor.
· The SKS4 humidifier must be properly levelled, in order to ensure proper return of condensate through the heat exchanger.
Minimum Clearances
· The following minimum clearances are indicated for inspection and servicing access. The SKS4 humidifier is designed for a zero clearance to combustible materials.
· Leave a clearance of at least 39” (1 m) to the front panel and 24″ (0.6 m) on the left, right and back sides of the humidifier.
· Leave a clearance of at least 30” (0.75 m) on top of the humidifier.

m2i4n”im(0u.m6m) 24m” (in0i.m6mum)

30″ (0.75m) minimum

24m” (in0i.m6mum) m3in9im” (u1mm)

Illustration 7 – SKS4 Minimum Clearances (Floor Mounted)

Ceiling Installation
The SKS4-050, 100 & 130-SLP models can also be hung by the ceiling using the appropriate lifting and hanging bracket. Provide the following clearances when hanging these models to the ceiling:
27.4″ (69.5 cm)
7.6″ (19 cm)

43.5″ (110 cm)

Rod and Nuts 3/8″ (M10) minimum

Lifting and Hanging Bracket

Illustration 8 – Minimum Clearances for Models SKS4-050, 100 & 130-SLP (Ceiling Mounted)

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Floor Mounting – Humidifier with OSHPD Preapproval (OSP)
For SKS4 humidifiers with the OSHPD Special Seismic Certification Preapproval (OSP) option, the floor legs must be secured to the floor using 12 bolts and washers of 1/2″ (12mm) diameter (not supplied).

E

D

Rear Legs

Front Legs

12x ؽ” (12mm)

F

G

C

B

A

Illustration 9 – OSHPD Humidifier Floor Mounting Dimensions (Bottom View)

Table 5 – OSHPD Humidifier Floor Mounting Dimensions

Model SKS4-050-SLP SKS4-100-SLP SKS4-130-SLP SKS4-190-SLP SKS4-290-SLP SKS4-390-SLP SKS4-500-SLP SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP

A
11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2] 11.1 [28.2]

B
31.1 [79.1] 31.1 [79.1] 31.1 [79.1] 31.1 [79.1] 31.1 [79.1] 44.1 [112.1] 44.1 [112.1] 44.1 [112.1] 44.1 [112.1] 44.1 [112.1]

Dimensions (in) [cm]

C

D

E

2.7

5.4

2.2

[6.9] [13.7] [5.6]

2.7

5.4

2.2

[6.9] [13.7] [5.6]

2.7

5.4

2.2

[6.9] [13.7] [5.6]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

2.7

5.4

2.3

[6.9] [13.7] [5.9]

F
16.5 [41.9] 16.5 [41.9] 16.5 [41.9] 19.3 [49.1] 19.3 [49.1] 23.9 [60.8] 23.9 [60.8] 27.3 [69.4] 27.3 [69.4] 27.3 [69.4]

G
19.8 [50.3] 19.8 [50.3] 19.8 [50.3] 22.9 [58.2] 22.9 [58.2] 27.6 [70.0] 27.6 [70.0] 30.9 [78.5] 30.9 [78.5] 30.9 [78.5]

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Minimum Clearances – Weather Proof Enclosure
· The following minimum clearances are indicated for inspection and servicing access. The SKS4 humidifier is designed for a zero clearance to combustible materials.
· Leave a clearance of at least 45” (1.1 m) to the front panel and 24″ (0.6 m) on the left, 36″ (0.91 m) on the right and 72″ (1.8 m) back sides of the humidifier.
· Leave a clearance of at least 48” (1.2 m) on top of the humidifier.

48″ (1.2m) minimum

Illustration 10 – Weather Proof Enclosure Clearances

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Page | – 15 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Weather Proof Enclosure Installation on Floor/Roof
The base of the SKS4 humidifier must be secured to the floor/roof using ½” (12mm) diameter bolts and washers (not supplied). Use the provided ½” (12mm) diameter holes to secure the SKS4 humidifier to the floor/roof.
Use Ø ½ (12mm) bolts and washers (not supplied) to secure the humidifier to the floor/roof
Illustration 11 – Floor/Roof Installation

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Page | – 16 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Step 2 – Steam Distribution Pipe Installation
Fundamental Design Concepts
Follow these general installation rules in order to avoid any restrictions inside the distribution pipes and the humidifier, as well as condensation accumulation, which can lead to severe water accumulation in the duct or a humidifier malfunction.
CAUTION: Risk of malfunction. Avoid kinks, sags and areas where condensate can be trapped.
· The minimum steam pipe gradient must be 7°, i.e. 5” (125mm) rise in 40” (1m) run. · The total length of flexible steam hoses must not exceed 16 feet (5 m). For insulated rigid piping, it must not exceed
50 feet (15 m). · The lowest point of any steam hose or rigid pipe must be the humidifier. If the humidifier cannot be the lowest
point of the piping, install one or more steam traps (S Type) at the lowest point(s) of the steam supply piping. The steam separator (S trap) must be installed higher than the static pressure of the system by at least 2″ (51 mm). · Use rigid copper piping whenever possible. Flexible steam hoses can be used for short runs (up to 16 feet or 5 m) or for interconnecting between rigid pipe runs. Ensure that there are no kinks and that the hose does not sag when using flexible tubing. Do not use flexible hoses for curved portions of the steam line. · When using rigid copper pipe, insulation must be used to diminish condensation build up.
Incorrect Installation

SKS

Illustration 12 – Steam Distribution Pipes: Incorrect Installation

Minimum 12” (305mm)

Correct Installation Humidifier with 2 S.A.M.E2 manifolds
15%

SKS

Static pressure + 2” (50mm)

Correct Installation humidifier with Multisteam.
15% Minimum 12”
(305mm)
SKS

Illustration 13 – Steam Distribution Pipes: Correct Installation

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Static pressure + 2” (50mm)
Page | – 17 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Steam Dispersion System Selection
In order to prevent the accumulation of condensation in air ducts, Neptronic has designed three basic configurations of steam distribution systems to provide the most economical solution for any particular application.
Steam Absorption Manifold (S.A.M.E2) Horizontal Duct
The S.A.M.E2 system is suitable for installations where absorption distances are short, less than 5 feet (1500 mm), and/or low duct temperatures are in effect. S.A.M.E2 are used in applications with restricted duct dimensions.
air
900
Illustration 14 – Steam Absorption Manifold (S.A.M.E2) Horizontal Duct
Steam Absorption Manifold (S.A.M.E2) Vertical Duct
The S.A.M.E2 system for vertical ducts is used when the absorption distances are normal and the requirement is for an economical and efficient solution.

Illustration 15 – Steam Absorption Manifold (S.A.M.E2) Vertical Duct
Multi-Steam System
The Multi-Steam system is used in critical locations in air handling systems, particularly where absorption distances are very short, less than 3 feet (900 mm), or where low air duct temperatures are present. The Multi-Steam is custom made to the dimensions of the duct or AHU. Instructions to install the Multi- Steam system are described in a specific installation instructions manual enclosed with the Multi-Steam system.

air

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Illustration 16 – Multi Steam System

Page | – 18 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Steam Dispersion General Recommendations

Follow these general rules based on the steam capacity of the humidifier:
· The connection pipe sizes between the SKS4 humidifier and the steam distributor in the duct must be: o 2” (51mm) for capacities up to 90lb/h (41kg/h) o 3” (76mm) for capacities up to 242lb/h (110kg/h) o 4” (100mm) for capacities up to 440lb/h (200kg/h) o 5” (125mm) for capacities up to 690lb/h (314kg/h)
· For all humidifiers having a capacity below 220lb/h (100kg/h), use standard Neptronic S.A.M.E2 steam distribution pipes. A Multi-Steam system can be offered if shorter absorption distances are required.
· For all humidifiers having a capacity above 220lb/h (100kg/h), use the Multi-Steam system.
· For all humidifiers having a capacity above 690lb/h (314kg/h), use 2 Multi- Steam units per air handling unit (AHU) or air duct with an equal duty split to each Multi-Steam system.

S.A.M.E2 System

Positioning the S.A.M.E2

The steam manifold must be mounted and secured through the side of the air handling unit or duct. Ensure that provisions are made for safe accessibility, ideally with an observation light and window. Ensure that the construction of the duct wall is suitable enough to support the steam pipe for the duration of the installation life.
The dimension of the hole size in the duct must be as follows:

Steam Manifold Ø 2 ” (54 mm)

Hole Size ØA
2″ (51 mm) 3″ (76 mm)

5” (120mm)
ØA

4” minimum (102mm)

5” (120mm)

Illustration 17 – Duct Hole Dimensions and Minimum Distance
WARNING: Risk of condensation. Ensure that the minimum distance at the end of the manifold is at least 4″ (102 mm) from the top of the duct.

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Page | – 19 –

Placement of Steam Pipe in Horizontal Duct
2 Pipes

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
3 Pipes

H 24” minimum
(600mm)
1/5 H

2/5 H
air

1/2 H
H 36” minimum
(900mm)

1/6 H

1/3 H
air

8” (200mm)

10” (250mm)

10” (250mm)

Illustration 18 – Pipe Placement: Horizontal Duct Note: Steam pipe must be supported on the end by appropriate duct hanger or strap (supplied by others).
Placement of Steam Pipe in Vertical Duct

1/4 W

2 Pipes
W 24” minimum
(600mm)
1/2 W

1/4 W

1/6 W

3 Pipes

W
36” minimum (900mm)

1/3 W

1/3 W

1/6 W

Illustration 19 – Pipe Placement: Vertical Duct

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Page | – 20 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Steam Pipe Work to Duct Connections with S.A.M.E2
Models SKS4-050-SLP
For these models, a single Ø2” (51mm) feed pipe must be connected to two S.A.M.E2 steam manifolds with a suitable reduction at the lowest point to allow a ؽ” (15mm) condensate drain from the main steam supply.
Insulated pipe

Ø2” (51mm)

Min. 2/5 H

Air Duct

H

ؽ” (15mm)

Static pressure + 2” (50mm)

Min. 4” (100mm)
Steam distribution manifolds (S.A.M.E2) minimum lenght = 35” (900mm)

Illustration 20 – SKS4-050-SLP Steam Pipe Connections
Models SKS4-100-SLP
For these models, a single Ø3” (76mm) feed pipe must be connected to two S.A.M.E2 steam manifolds with a suitable reduction at the lowest point to allow a ؽ” (15mm) condensate drain from the main steam supply.
Insulated pipe

Ø3” (76mm)

Min. 2/5 H

Air Duct

H

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ؽ” (15mm)

Static pressure + 2” (50mm)

Min. 4” (100mm)
Steam distribution manifolds (S.A.M.E2) minimum lenght = 35” (900mm)

Illustration 21 – SKS4-100-SLP Steam Pipe Connections

Page | – 21 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Models SKS4-130-SLP & SKS4-190-SLP
For these models, a single Ø3” (76mm) feed pipe must be connected to three S.A.M.E2 steam manifolds with a suitable reduction at the lowest point to allow a ؽ” (15mm) condensate drain from the main steam supply.

Insulated Pipe

Min. 1/3 H

Air Duct

Ø3″ (76mm)

H

ؽ” (15mm)

Static Pressure + 2″ (50mm)

Min. 4″ (100mm)
Steam Distribution Manifolds (S.A.M.E2) minimum length = 35″ (900mm)

Illustration 22 – SKS4-130-SLP & SKS4-190-SLP Steam Pipe Connections

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Page | – 22 –

Multi-Steam System

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Selection of Multi-Steam System
· For all Multi-Steam units, use the Neptronic Humidisoft program to size the unit.
· Where two Multi-Steam units are required (duties in excess of 690lb/h [314kg/h]), make your selection using the following rules:
o Divide the air flow volume in half. o Divide the AHU / air duct width in half. o Height of the duct must remain at 100% its height. o This will size the Multi-Steam units so that they can be placed side by side.
· For installation of Multi-Steam units, refer to the Neptronic Multi-Steam Installation Instructions.

Air duct

Mounting bracket must be level horizontally
Rod, bolt, nut and washer assembly

Min. 2” (50 mm)

Min. 2” (50 mm)
Steam supply hose or rigid pipe to Humidifier

Min. 2” (50 mm)

ؽ” (15mm)

Static pressure + 2” (50mm)

Condensate drain pipe to steam trap Header must be pitched toward condensate drain

Illustration 23 – Multi-Steam (Horizontal Duct)

Air flow

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Air duct

10% slope is integrated in header design
Steam supply hose or rigid insulated pipe
to Humidifier (by others)
Neptronic Humidifier

Air flow

Rod, bolt, nut and washer assembly (by others)
Condensate drain pipe (by others) Static pressure + 2” (50mm)

Illustration 24 – Multi-Steam (Vertical Duct)

Page | – 23 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Steam Pipe Work to Duct Connections with Multi-Steam

Models SKS4-050-SLP to SKS4-690-SLP

For these models, a single Ø2” (51mm), Ø3” (76mm), Ø4” (100mm) or Ø5” (125mm) feed pipe must be connected to a single Multi-Steam with a suitable reduction at the lowest point to allow a Ø1/2” (15mm) condensate drain from the main steam supply.

Min. 7° pipe slope

Insulated Pipe

Air Duct

Ø2″ (51mm) or Ø3″ (76mm) or
Ø4″ (100mm) or Ø5″ (125mm)

ؽ” (15mm)

Static Pressure + 2″ (50mm)

Multisteam

Total length of steam conduit must not exceed 16 feet (5m).

Illustration 25 – SKS4-050-SLP to SKS4-690-SLP Steam Pipe Connections
Models SKS4-950-SLP & SKS4-1250-SLP
For these models, two Ø4” (100mm) or Ø5” (125mm) steam outlets must be connected to two Multi-Steam with a suitable reduction at the lowest point to allow a Ø1/2” (15mm) condensate drain from the main steam supply. If the two Ø1/2” (15mm) condensate pipes are connected, the common condensate drain must be Ø3/4” (20mm).

Air Duct

Total length of steam conduit must not exceed 16 feet (5m)

Min. 7° pipe slope Insulated Pipe
Ø4″ (100mm) (x2) or Ø5″ (125mm) (x2)

ؽ” (15mm)

ؾ” (20mm)

Static Pressure + 2″ (50mm)

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Illustration 26 – SKS4-950-SLP & SKS4-1250-SLP Steam Pipe Connections

Page | – 24 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Step 3 – Raw Steam Supply Connection

Steam supply piping must conform to local codes and regulations. Any installation work must be carried out by suitably qualified personnel.
· Risk of distortion and failure. Steam piping installation must be supported so that no strain are imposed on the humidifier steam inlet flange and control valve.
· Pipes must be inspected for dirt and chips after threading and reaming the end of pipes.

Union Dimensions and Installation

Table 6 – Raw Steam Supply Dimensions Model
SKS4-050/100/130-SLP SKS4-190/290-SLP
SKS4-390/500/690-SLP SKS4-950-SLP SKS4-1250-SLP

Raw Steam Inlet ؾ” (20mm) Ø1” (25mm)
Ø1-1/4” (32mm) Ø1-1/2” (40mm) Ø1-1/4” (32mm) (x2)

Condensate Return Outlet
ؾ” (20mm)
ؾ” (20mm)
Ø1-1/4” (32mm)
Ø1-1/2” (40mm)
Ø1-1/4” (32mm) (x2)

Note: Model SKS4-1250-SLP is equipped with two heat exchangers and therefore has two raw steam inlets and two condensate return outlets.
Typical Raw Steam Installation
· A strainer as well as a shut off valve (not supplied) must be installed upstream to the actuated control valve on the raw steam supply pipe.
· Vacuum breakers (not supplied) must be installed between the SKS4 heat exchanger and the actuated control valve.
· Brass coupling must be used between the heat exchanger stainless steel pipes and steam inlet / condensate outlet piping.
· The condensate must be evacuated efficiently. Therefore, a condensate pocket (not supplied) and stream trap must be installed to ensure proper condensate elimination.
· After installation, field piping and humidifier steam piping must be checked for leaks. All leaks MUST be sealed prior to commissioning the Humidifier.

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Page | – 25 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Steam Supply Size
The size of the steam supply pipe and the control valve must be calculated considering 1.5 times more raw steam compared to the clean steam produced and distributed into the AHU.

STEAM

Vacuum breaker (supplied by others)
Pressure gage (supplied by others)
Shut off valve (supplied by others)
Piping (by others)

SKS4
12″ [30cm] minimum

Strainer (supplied)
Actuated control valve (supplied) Float & thermostatic steam trap (supplied)
Steam Trap (supplied by others) Small capacity to eliminate possible condensate from raw steam line

CONDENSATE RETURN

Cap (supplied by others)
Check valve (supplied by others) Condensate pocket (supplied by others) Diameter should be ½” [25mm] higher than condensate pipe

Cap (supplied by others)

Illustration 27 – SKS4 Pipework for Raw Steam

Raw Steam Supply and Condensate Installation
· Connect the raw steam inlet to an adequate steam supply with actuated control valve, strainer and shut off valve.
· One control valve is required for each raw steam inlet.
· Control valve must be fitted with a mechanism and be electrically wired so that the valve returns to the closed position when no air flow is detected in the AHU.
· In case of two condensate outlets, each individual condensate outlet requires an individual steam trap. Do not `’group trap”.
· Float and thermostatic type steam traps are recommended for the condensate from the heat exchanger and must be fitted no less than 12” (30cm) below the condensate outlets, with condensate pocket fitted before the trap.
· Thermostatic type steam traps are recommended as the small capacity trap to eliminate condensate from the raw steam line.

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Page | – 26 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Positioning the Control Valve
· Install the actuated valve (AM060 actuator with globe valve) between 20 to 30 degrees from vertical in order to reduce the convection heat to the actuator.
20-30º
ELECTRIC ACTUATOR

VALVE BODY

A

A STEAM SUPPLY SIDE

B

A B

A

FLOW DIRECTION

Illustration 28 – Control Valve Orientation and Angle

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Page | – 27 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Step 4 – Water Supply Installation

Water supply installation must conform to Local and National Codes. Any installation work must be carried out by suitably qualified personnel.

Water Inlet Specifications
The SKS4 humidifier is designed to be used with tap, reverse osmosis and deionised water. · For normal operation, pre-treatment of water is not necessary. · As the humidifier is equipped with the Neptronic Anti-Foaming Energy Conservation (AFEC) system, which drains the humidifier in the presence of foam to ensure clean and safe operation, the use of softened water is not required. If a third party requires a water softener for any operational or equivalency purposes, ensure that the water dilution feature is enabled. To enable this function, configure the value of the BlowdownRate setting located in the Installation menu (see page 47 for details). · Water Inlet Specifications: o Maximum water supply pressure: 25 to 70 psig (170 to 480kPa) o Minimum water temperature: 39°F (4°C) o Maximum water temperature: 86°F (30°C)
Chloride Concentration in Water Supply

The presence of chlorides (Cl-) can cause corrosion to the humidifier components that operate at elevated temperatures, such as the evaporation chamber. Damage from corrosion is not covered under warranty.
Here are some general guidelines to follow for chloride concentration based on the type of water used:

Water Source RO/DI
Softened Tap

Chloride (mg/L or PPM) < 5 < 30 < 50

Water Treatment Guidelines

Water treatment, such as reverse osmosis and deionization, can dramatically reduce the service requirements of the humidifiers in hard water environments. The use of purified water allows for longer operation time in between drain intervals, which can be important for maintaining humidity control in high- demand applications.

Here are some general guidelines to follow in regard to water treatment:

Total Hardness (mg/L or PPM)
<50
61-120
120-180 181-800

800

Description
Soft
Moderately Hard
Hard Very Hard Extremely Hard

RO Recommended?
No Optional (based on application
requirements) Yes Yes
Yes, High-TDS System Required

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Page | – 28 –

Water Supply Line Installation

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

· To facilitate servicing, a shut off valve (not supplied) must be installed in the water line, close to the humidifier.
· It is recommended to install a water hammer arrestor, in order to absorb hydraulic shock and minimize water hammer when the fill valve closes.
· To install the water supply, connect to the male threaded part of the pipe and tighten it.

Model

Water Inlet Connection Size

SKS4-XXXX

½” (15mm) NPT Male

Shut-off Valve Manometer Water Hammer

(Isolation Valve)

Arrestor

Water Filter Check Valve

Water Inlet Connection

Note: The shut-off valve (isolation valve), water filter, manometer, water hammer arrestor and check valve are all supplied by others
Illustration 29 – Water Supply Connections

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Page | – 29 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Step 5 – Water Drain Connection

Water drain installation must conform to Local and National Codes. Any installation work must be carried out by suitably qualified personnel.

Water Drain Specifications

· Water drain temperature: 140°F (+60°C)

Model
SKS4-050 to 290-SLP SKS4-390 to 1250-SLP

Water Drain Outlet Connection Size Ø7/8” (22mm)
Ø1 3/8” (35mm)

Pipe Ø for Length More Than 15ft (4.5m)
Ø1 ½” (40mm)
Ø2″ (50mm)

Maximum Drain Flow Rate
12gpm (48 l/min)
24gpm (96 l/min)

Water Drain Installation

· Water drain outlet connection must be connected to drain pipe of sufficient size.
· It is recommended to use Ø7/8” (22mm) or Ø1 3/8” (35mm) minimum standard copper or stainless steel hydraulic pipes.
· The installed drain piping must be rated for a temperature of 212°F (100°C).
· Water main drain and drip pan must be kept separate to the open drain. Do not connect the main drain and the drip pan before the open drain, they must not be piped together or to other appliances.
· Minimum water drain pipe gradient must be of ¼” (6.5mm) per foot (300mm) horizontal run.
· No drain trap must be installed on the humidifier drain pipes.
· The maximum equivalent pipe length of the main drain must not exceed 15ft (4.5m) between the drain outlet of the humidifier and the open drain. Otherwise, the drain pipe diameter must be increased to the value indicated in the table above.
· A minimum 1” (25mm) air gap must be kept between the connection of the humidifier drain pipes and the open drain line.

SKS4

Drip Pan Ø ½ (15mm)

Main Drain Ø (22mm) or Ø 1 (35mm)
Building water drain Ø 3 (80mm) minimum

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Illustration 30 – Water Drain Connections

Page | – 30 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Stage 6 – Electrical Supply Connections
CAUTION: Risk of electric shock. Disconnect the humidifier from the electric supply before proceeding with the connection. All work concerned with electrical installation MUST only be performed by a qualified electrician and must conform to the procedure, regulation and local codes.
· Use copper conductors only. · The electrical supply must also be isolated for the purpose of emergency and servicing. · The isolator must have a contact separation of at least 0.12″ (3mm). · The humidifier is equipped with a built- in disconnect switch, to turn off the power without opening any access
doors. · An external over current protection must be installed on the supply, adjacent to the humidifier. It is also
recommended to install a circuit breaker. · To provide strain relief to the supply cable, install a knock-out (not supplied) at the bottom of the electrical
compartment of the humidifier. · Ensure that the size of the wire conductors is appropriate for the current supplied. · Ensure that the incoming power cable is secured via a suitably sized cable gland. · Ensure that each terminal connection is properly secured. · Ensure that the ground conductor is equipped with a ring terminal and is connected directly to the electrical
panel. Do not use raw steam piping as an electrical ground.
Ground

Disconnect Switch

L1

L2

or (L)

(N)

Illustration 31 – Power Supply Connection

Electrical Power Supply

The SKS4 humidifier requires the following single phase power supply:

Model SKS4-050 to 290-SLP SKS4-390 to 1250-SLP

Voltage
120Vac – 1ph 208Vac – 1ph 240Vac – 1ph

Current 4A 8A

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Page | – 31 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Step 7 – Electrical Control Connections
Printed Circuit Board

1 23 45
JP6 WATER LEVEL

1 23 JP7
WATER TEMP+FOAM

1 234 JP9
WATER VALVES

LCD1

ETHERNET BOARD
JP3

12 JP10
DRAIN PUMP

1 234 JP12
STEAM VALVE

JP13 1

THERMAL SWITCH

2

ETHERNET PCB

SD1 Micro SD card port
CN2
USB drive port

JP4
ETHERNET BOARD

Electrical Control Connections

TB4

TB1 TB2 TB3

TXD
JP1 RXD

EOL

EOL

JP2
TXD RXD

NETWORK PCB

NETWORK BOARD

JP5

TB5 TB6

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TB7 WATER LEAK DETECT
12
Illustration 32 – Printed Circuit Board Interface

JP20 1 POWER 2
JP25 1 2
Page | – 32 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
The Printed Circuit Board (PCB) is equipped with an advanced microprocessor, which controls all of the functions of the humidifier. All electrical control connections have been grouped alongside the bottom left corner of the PCB.
Electrical Control Connections

TB1 TB2 TB3

TB4

RS 485 A+

1

(HRL24) B-

2

Network Contacts

RS 485

(BACnet MS/TP A+

1

or Modbus RTU) B-

2

24 Vac

1

Airflow switch

2

Safety Contacts

High limit humidistat

3

Interlock

4

On/Off demand contact

5

Power Output Analog Inputs Analog Output

Common

1

24 Vac

2

Control Demand

3

Room Humidity

4

Duct Humidity

5

Steam Output

6

Alarm Contacts Service Contacts

Common

1

Normally Open

2

Normally Closed

3

Common

1

Normally Open

2

Normally Closed

3

TB5 TB6

Illustration 33 – Electrical Control Connections

Safety Contact Connections

The Airflow switch contact must be wired between terminals TB3 1&2. If this contact opens, operation of the SKS4 unit will stop. The unit will display the airflow switch as open, but will not generate an alarm. If an airflow switch is not used, install a jumper between terminals TB3 1&2.
The High limit humidistat contact must be wired between terminals TB3 1&3. If this contact opens, operation of the SKS4 unit will stop and an alarm message will be displayed. If a high limit humidistat is not used, install a jumper between terminals TB3 1&3.
The Interlock must be wired between terminals TB3 1&4. If this contact opens, operation of the SKS4 unit will stop. The unit will display the Interlock as open, but will not generate an alarm. If Interlock is not used, install a jumper between terminals TB3 1&4.

Dry Contacts

Two series of volt free contacts are provided:

1. Alarm Contacts

2. Service Contacts

· These contacts are used to switch a low voltage, ideally 24V, with a switching current of no more than 3 Amps.

· Each series has one Normally Closed contact and one Normally Open contact.

· It is recommended to use the Normally Closed contact, as this contact will open in the event of a humidifier fault.

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Page | – 33 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

TB1 TB2 TB3

TB4

1 2

Alarm contacts Service contacts

1 2

1 2
3 4 5
1 2 3
4 5 6

Common

1

Normally Open

2

Normally Closed

3

Common

1

Normally Open

2

Normally Closed

3

Illustration 34 – Alarm and Service Contact Wiring

TB5 TB6

Humidifier Control

Analog Signals
For operation of modulating humidifiers, the analog signal(s) must be connected between terminals TB4 1 and TB4 3, 4 and/or 5. To configure the source of the signal(s), access the Control sub-menu located in the Installation menu (see page 47).
Humidity Control by Humidistat (External Mode)
Humidity controlled externally, using HRO20 humidistat:

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Illustration 35 – Control Signal from HRO20 Humidistat

Page | – 34 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Humidity controlled externally, using HRO20 humidistat with SHR10 or SHC80 as space sensor:

Illustration 36 – Control Signal from HRO20 Humidistat with Remote Humidity Sensor (SHR10 or SHC80)
Humidity Control by Humidifier (Internal Mode)
Humidity controlled internally, using SHR10 or SHC80 as space sensor:

Illustration 37 – Humidity Signal from Remote Humidity Sensor (SHR10 or SHC80)
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Page | – 35 –

Humidity Control by External Signal
Humidity controlled externally, using an external signal source:

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Illustration 38 – Control Signal from External Device

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Page | – 36 –

Network Communication

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

If the control signal is from a BACnet MS/TP or Modbus RTU network, connect terminals TB2 1&2 to the network (RS485 A+ & B-).
If the control signal is from a HRL24, connect terminals TB1 1&2 to the network (RS485 A+ & B-).
The network control signal(s) must be selected by accessing the Control sub- menu located in the Installation menu (see page 47). To setup the communication parameters, access the Integration menu (see page 51).

Note: BACnet MS/TP is configured by default. To change the communication interface to Modbus RTU, access the NtwrkOption setting located in the Network sub-menu of the Integration menu (see page 51).

Illustration 39 – Network Communication Connections

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Page | – 37 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Controls Placement (Steam Dispersed into a Duct or AHU)
A typical humidifier control system includes the following along with the humidifier: · A wall or return duct humidistat · A high limit duct humidistat · An airflow switch
Placement of these devices is critical to the proper operation of the overall system. · The return air humidistat must always be located in the return air duct, in order to ensure accurate sensing of the air from the humidified space. · Alternatively, a room humidistat can be used. The room humidistat must be located on an inside wall or column. It must not be near any discharge air from supply ducts or sources of heat or cold. · The airflow switch must be placed in a position capable of accurately opening on a loss of air flow, in order to prevent the humidifier from running when there is no air to absorb humidity. · The high limit humidistat must be positioned far enough, minimum 15 ft (4.6 m), downstream of the steam dispersion manifold(s) to prevent over humidification of the duct that could result in condensation. · Any device that may be triggered by high humidity levels in close proximity to the steam dispersion manifold must also be positioned at least 15 ft (4.6m), downstream of the dispersion manifold(s).
15′ minimum (4.6m)

Fresh Air

Return Air

Air

Return SHC80 Humidity sensor
Or room HRO20 humidistat

Air flow switch

Steam dispersion manifold

SHS80 high limit for constant flow and VAV application
(or any other device detecting hum idity)

Illustration 40 – Controls Placement (Steam Dispersed into a Duct or AHU)

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Page | – 38 –

Steam Actuated Valve

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

· For models SKS4-050-SLP to SKS4-950-SLP (1 control valve), connect the humidifier to the actuated valve (AM060 actuator with globe valve) as per the illustration on the left.
· For models SKS4-1250-SLP (2 control valves), connect the humidifier to the control valves (AM060 actuators with globe valves) as per the illustration on the right.

Common 24VAC Analog Signal Output Feedback in Vdc
Common 24VAC Analog Signal Output Feedback in Vdc

SKS4 Humidifier
1 2 34

SKS4 Humidifier

1234

1 2345

12345

12345

Control Valve

Control Valve 1

Control Valve 2

Models SKS4-050 to 950-SLP

Model SKS4-1250-SLP

Illustration 41 – Control Valve Connection

· Ensure that DIP switch #4 is set to the “ON” position on the AM060 actuator.

ON 1 2 34

1 = OFF 2 = OFF 3 = OFF 4 = ON

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Rotation: Up Fail safe return: Down
Input in Vdc Feedback in Vdc
Illustration 42 – AM060 Actuator DIP Switch Settings

Page | – 39 –

Controller Configuration

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Back/Menu Button Up Arrow Button

Enter Button Plus Button

Down Arrow Button

Minus Button

Power Button

Drain Button Status Display

Illustration 43 – SKS4 Controller

Control Panel Features

The following are the features of the Control Panel and their description:

Table 7 – Humidifier Control Panel Description

Feature

Description

Indicates that the humidifier is turned on. The LED will begin blinking as the
(Blue) system is initializing.

Status Display Power Button Drain Button

(Red)
O
(Off)

Indicates that the alarm is issuing a warning and that the system must be verified.
Indicates that the humidifier is turned off.
The power button is used to turn the humidifier on or off. Must be pressed and held for 3 seconds to perform the related action, in order to prevent accidental activation. Even when the humidifier is powered off, the controller remains operational. The drain button is used to manually activate the drain cycle. Must be pressed and held for 3 seconds to perform the related action, in order to prevent accidental activation. Even when the humidifier is powered off, a drain cycle may be initiated. Once the manual drain cycle is completed, the system will automatically be powered off. To turn the humidifier back on, press and hold the power button.

Up and Down Arrow Buttons

The up arrow button is used to scroll to the next menu item or parameter. The down arrow button is used to scroll to the previous menu item or parameter.

Plus and Minus Buttons
Back/Menu Button
Enter Button

The plus button is used to increase the value of the displayed parameter.
The minus button is used to decrease the value of the displayed parameter.
The back/menu button is used to go to previous menu or to access the Main Menu page from the Idle Screen. The enter button is used to advance to the next sub-menu, to access the selected option or to confirm set parameter value.

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Page | – 40 –

Idle Screen

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

When the controller is in operation, the unit displays the following information on the Idle Screen:

Table 8 – Idle Screen Display Description

Setting HumDemand:

Default Current value

Range (* indicates no configuration; display only)

• (min: 0.00%, max: 100.00%)

ControlState:

Current value

• (Off, Normal, LowLimit, HighLimit, NoAirFlow, Interlock)

PowerOutput: State:

Current value Current value

• (min: 0.00%, max: 100.00%)
• (Off, Idle, LineRinse, TankRinse, Filling, Draining, Heating, Boiling, Alarm)

Description/Notes
Displays the current humidity demand value. Displays the current state of the safety control circuit and whether the circuit has been disconnected due to a safety switch. Displays the measured power output of the system as a percentage of the total power.
Displays the current state of operation of the humidifier.

Illustration 44 – Idle Screen Display

Menu Access

· From the Idle Screen, the Main Menu can be accessed by pressing the Back/Menu button , enabling access to the General menu.
· To view other menu options and perform configurations to the system, press Enter while on the Idle Screen to advance to the Login Screen, where a valid password must be entered.
· Four different passwords can be used, each granting access to an additional menu option depending on the access level assigned to the provided password.
· If a password of higher access is provided, all menu options accessible with the use of a lower level password will also be unlocked.

Table 9 – Access Levels

Access Level
1

Password None

2

2222

3

3322

4

4433

5

5544

Menu Unlocked General User Service
Installation Integration

Description/Notes Grants access to General menu. Grants access to General and User menus. Grants access to General, User and Service menus. Grants access to General, User, Service and Installation menus. Grants access to General, User, Service, Installation and Integration menus.

Note: To modify or retrieve lost passwords, please contact factory.

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Page | – 41 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
A. After accessing the Login Screen, use the + or – buttons to increase or decrease the value of the number that is highlighted.
B. Use the , buttons to scroll to the next or previous number. C. Press Enter to confirm the password once completed. If you enter the wrong password, the SKS4 controller
displays a “Login Failed” message. D. The Back/Menu button may also be used to return to the Idle Screen display.
Illustration 45 – Login Screen
Menu Navigation and Configuration
A. Use the , buttons to select the desired menu category and press Enter to advance to the next sub-menu. B. Use the + and – buttons to increase and decrease values. Use the , buttons to scroll to the next or previous
parameter. Values are saved as soon as a change is made. C. Press the Back/Menu button to go back one menu. The current menu location is displayed at the top of the
screen. D. To exit completely, press the Back/Menu button until you return to the Idle Screen. After 5 minutes of inactivity,
the controller will automatically return to the Idle Screen.

Illustration 46 – Main Menu Page
Note: Available settings and range selections may vary depending on current configuration. The tables in the following sections display all the possible selections. The Description/Notes column indicates the conditions required for the associated setting to appear.

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Page | – 42 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Menu – General [Level 1 – No password required] Press the back/menu button from the Idle Screen to access the General menu.

Sub-Menu

Setting AirFlow: SupplyHighLimit:

Default Closed Closed

Status Control

Interlock:
OccupancyState: ControlState: BoilerDemand: PowerOutput: ServiceDue: State:
WtrProbeFail:

Closed
Current value Current value Current value Current value No Current value
None

RoomDemand:

Current value

SupplyHLDemand: Current value

HumDemand: AirFlow:

Current value Closed

SupplyHighLimit: Closed

Interlock:

Closed

Physical IO

BinExtDemand: ControlInput: RoomRH:

0% Current value Current value

SupplyHLRH:
WtrLeakDet: WtrLvlLow: www.neptronic.com

Current value
Ok Current value

Range ( indicates no configuration; display only) (Closed, Open)

• (Closed, Open)
• (Closed, Open) (Occupied, Unoccupied, Vacant, Off) (Off, Normal, LowLimit, HighLimit, NoAirFlow, Interlock) (min: 0.00%, max: 100.00%) (min: 0.00%, max: 100.00%) (No, Yes) (Off, Idle, LineRinse, TankRinse, Filling, Draining, Heating, Boiling, Alarm) * (None, Capacitive, Resistive, Both)
• (min: 0%, max: 100%)
• (min: 0%, max: 100%) (min: 0%, max: 100%) (Closed, Open)
• (Closed, Open)
• (Closed, Open)
• (0%, 100%) (min: 0.00%, max: 100.00%) (min: 0.00%, max: 100.00%)
• (min: 0.00%, max: 100.00%)
• (Ok, Leak) * (Inactive, Active)

Description/Notes
Displays the status of the airflow switch. If Open is displayed, it indicates that the airflow is not detected by the air pressure switch. Displays the status of the high limit contact. If Open is displayed, it indicates that the humidity level has exceeded the setpoint on the high limit humidistat. Displays the status of the interlock. If Open is displayed, it indicates that the humidifier is stopped as a result of the interlock safety being open. Displays the current occupancy state. Displays the current state of the safety control circuit and whether the circuit has been disconnected due to a safety switch. Displays the measured humidity demand of the humidifier.
Displays the measured power output of the system as a percentage of the total power.
Displays whether the humidifier is due for servicing.
Displays the current state of operation of the humidifier.
Displays which one of the water level sensor’s probes is currently not functioning properly. Displays the room humidity demand value. (Only appears if ControlProfile is set to an internal control mode or HumCntrlDemandSrc is set to RoomDemand.) Displays the supply high limit humidity demand value. (Only appears if ModHLProfile is set to an internal control mode or HumCntrlHLSrc is set to SupplyHLDemand.) Displays the current humidity demand value. Displays the status of the airflow switch. If Open is displayed, it indicates that the airflow is not detected by the air pressure switch. Displays the status of the high limit contact. If Open is displayed, it indicates that the humidity level has exceeded the setpoint on the high limit humidistat. Displays the status of the interlock. If Open is displayed, it indicates that the humidifier is stopped as a result of the interlock safety being open. Displays whether there is currently a humidity demand, when an On/Off humidifier is used. (Only appears when using an On/Off humidifier.) Displays the current control input reading. Displays the room humidity reading value. (Only appears if ControlProfile is set to InternAnalog or RoomRHSrc is set to RoomRH.) Displays the supply high limit humidity reading value. (Only appears if ModHLProfile is set to InternAnalog or SupplyHLReadingSrc is set to SupplyHLRH.) Displays whether a water leak has been detected. If Leak is displayed, it indicates that there is a leak within the water line. Displays the status of the resistive low water level sensor.
Page | – 43 –

Sub-Menu

Setting WtrLvlHigh: WaterTemp:

Default Current value Current value

Physical IO System

FoamSensor:

NoFoam

ThermalCutout: DrainValve:

Closed Current value

CabinetTemp:

Current value

ContactorsFuse:
PowerOutFdbck: AlarmWarnRelay: ServiceWarnRelay: WtrLvlValve: TankWtrValve: DrainCoolValve: DrainPump: SteamVlvCtrl:
DrainPump2:

Normal
Current value Current value Current value Current value Current value Current value Current value Current value
Current value

DrainPump3:
WaterLevel: SteamValveFdbck:

Current value
Current value Current value

SysStatus:

Operational

Vendor: Model: AppVersion: SerialNo: Profile: MCULoad: MemoryLoad:
Runtime:

Neptronic 2.03.20220503 Current value Current value
Current value

ResetReason:

None

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SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Range ( indicates no configuration; display only) (Inactive, Active) (min: 32.00°F, max: 257.00°F) [min: 0.0°C, max: 125.0°C] Units: C, F

• (NoFoam, Foam)
• (Closed, Open)
• (Off, On)
• (min: -4.00°F, max: 212.00°F) * [min: -20.00°C, max: 100.00°C] Units: C, F
• (Normal, Blown Fuse)
• (min: 0.00%, max: 100.00%) (Off, On) (Off, On) (Off, On) (Off, On) (Off, On) (Off, On) * (min: 0.00%, max: 100.00%)
• (Off, On)
• (Off, On)
• (min: 0.0%, max: 120.0%) (min: 0.00%, max: 100.00%) (Operational, Operational Read-Only, Download required, Download in progress, Non-operational, Backup in progress) (min: 0.0%, max: 100.0%) * (min: 0.0%, max: 100.0%)
• (min: 0sec, max: 999999999sec)
• (None, BOR, Pin, POR, Soft, IWDG, WWDG, LPWR, Unknown)

Description/Notes
Displays the status of the resistive high water level sensor.
Displays the temperature of water in the evaporation chamber.
Displays whether foam has been detected within the evaporation chamber. If Foam is displayed, it indicates that the Anti-Foaming Energy Conservation (AFEC) system has detected foam. The humidifier will drain for a few minutes and return to normal operation. Displays the status of the thermal switch circuit on the PCB. If Open is displayed, it indicates that the wire has been incorrectly connected to the PCB. Displays the status of the normally open drain valve. (Only appears for units with weatherproof enclosure.)
Displays the temperature measured inside of the cabinet. (Only appears for units with the weather proof enclosure.)
Displays the current status of the PCB fuse. If Blown Fuse is displayed, the fuse must be replaced. Displays the feedback value of power output analog output. Displays the status of the alarm warning relay. Displays the status of the service warning relay. Displays the status of the water level sensor supply valve. Displays the status of the evaporation chamber water supply valve. Displays the status of the internal drain cooler valve. Displays the status of the first drain pump. Displays the value of the control signal coming from the actuated steam valve. Displays the status of the second drain pump. (Only appears for models having a second drain pump.) Displays the status of the third drain pump. (Only appears for models having a third drain pump.) Displays the percentage of water remaining in the evaporation chamber. Displays the value of the feedback signal coming from the actuated steam valve.
Displays the current system status.
Displays the name of the vendor of the product. (Always Neptronic) Displays the humidifier model name. Displays the current application software version. Displays the serial number of the humidifier. Displays a short profile for the configured device. Displays the current microcontroller load. Displays the current memory load. Displays the number of seconds that the system has been powered on. This value is reset every time the system id shut off. Displays the reason for the previous system reset: None = No Reset; BOR = Brownout Reset; Pin = Pin Reset (using PCB Reset Button); POR = Power-on Reset; Soft = Software Reset; IWDG = Independent Watchdog; WWDG = Windowed Watchdog; LPWR = Low Power Reset; Unknown = Unknown Cause

Page | – 44 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Menu – User Settings [Level 2 – Requires level 2 (or higher) password in order to access]

Sub-Menu Command Control System
Interface

Setting OccupSchedule:

Default –

RoomDemandLoop

[3]

RoomRHStp:

RoomRHUnocStp:

RoomRHVacStp:

SupplyHLLoop

[1]

SupplyHLStp: UTCOffset: Daylight Savings:

LocalDateTime:

Local Display

[5]

BacklightLvl:

Contrast:

KeypadBuzzer:

Language:

Units:

HRL

[3]

40.0%
30.0% 20.0%
80.0% -300min No YYYY-MM-DD 00:00:00
25% 10% Inactive English Imperial

Temperature:

Current value

TempBias: Humidity: HumidityBias: LockSetpnt:

0.00°F [0.00°C] Current value 0.0%RH
Unlock

Range 00:00 Monday to Sunday Event 1 to Event 6
min: 0.0%, max: 100.0%
min: 0.0%, max: 100.0% min: 0.0%, max: 100.0%
min: 0.0%, max: 100.0% min: -720min, max: 720min No, Yes
min: 0%, max: 100% min: 0%, max: 30% Inactive, Active English, French, Spanish Metric, Imperial

• (min: -40.0°F, max: 500.0°F) [min: -40.0°C, max: 260.0°C] Units: C, F min: -18.00°F, max: 18.00°F [min: -10.00°C, max: 10.00°C] Units: °C, °F (min: 0.0%, max: 100.0%) min: -10.0%RH, max: 10.0%RH Units: %RH Unlock, Lock

Description/Notes
Create a customized occupancy schedule with up to six events per day.
Only appears if ControlProfile is set to an internal control mode or HumCntrlDemandSrc is set to RoomDemand. Define the room demand setpoint value used during Occupied state. (Only appears if RoomRHStptSrc is set to Internal.) Define the room demand setpoint value used during Unoccupied state. Define the room demand setpoint value used during Vacant state. Only appears if ModHLProfile is set to an internal control mode or HumCntrlHLSrc is set to SupplyHLDemand. Define the supply high limit demand setpoint value. Configure the value of the UTC offset. Select whether to enable daylight savings or not.
Configure the current date and time.
Select the backlight level of the LCD screen. Select the contrast level of the LCD screen. Select whether to enable or disable the key press sound. Select the device language. Select whether to use a metric or imperial system of units for the local device. For units connected to the HRL24 controller. Only appears if ControlProfile or RHSrc is set to HRL.
Displays the room temperature value measured by the HRL24 controller.
Set the bias value for the temperature measured by the HRL24 controller.
Displays the room humidity value measured by the HRL24 controller. Set the bias value for the humidity measured by the HRL24 controller. Displays whether the setpoint obtained from the HRL24 controller can be modified or not.

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Page | – 45 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Menu – Service [Level 3 – Requires level 3 (or higher) password in order to access]

Sub-Menu Status Command

Setting RunTime: OnTime: ServRunTime: ServOnTime:
ManCalibTime:
ServiceDue:
DrainSchedule:
Request:

Default 0.00hr 0.00hr 0.00hr 0.00hr
0.00hr
No
–
None

Range ( indicates no configuration; display only) *

• (Yes, No) 00:00 Monday to Sunday Event 1 to Event 6
  None, Reset Alarms, Drain, Reset Counters, Filling, WaterCalib

Description/Notes
Displays the total runtime of the unit. Displays the total operating time of the unit. Displays the runtime of the unit, since the last servicing. Displays the operating time of the unit, since the last servicing. Displays the amount of time that has been elapsed since the last manual calibration of the water level sensor. (Only appears if WtrAutoCalib is set to Off). Displays whether the humidifier is due for servicing.
Create a customized draining schedule with up to six events per day.
Perform one of the following actions for the humidifier: reset warning alarms, initiate a drain cycle, reset service counters, fill the evaporation chamber or calibrate the water level sensor.

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Page | – 46 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Menu – Installation [Level 4 – Requires level 4 (or higher) password in order to access]

Sub-Menu Import User Config Export User Config

Setting

DrainInterval:

Quick Config

IdleTime: BlowdownRate: ServInterval:

ServOperation:

Control

FillMode:

ControlProfile:

ModHLProfile:

RoomDemandLoop

[6]

RoomPropGain: RoomIntgrlTime: RoomDrvtveTime: RoomProbBand:

RoomRHSrc:

RoomRHStptSrc:

SupplyHLLoop

[6]

SupplyHLPropGain: SupplyHLIntgrl: SupplyHLDrvtveTime: SupplyHLProbBand:

SupplyHLReadingSrc:

SupplyHLStpntSrc:

HumidityControl

[5]

HumLowDeadBand:

Default
6hr 24hr 0% 1000hr Allowed
Pulsed
ExternAnalog
Disabled
20.0 0.0sec 0.0sec 5.0% None None
10.0 0.0sec 0.0sec 10.0% None None

Range (* indicates no configuration; display only)
min: 0hr, max: 24hr
min: 0hr, max: 72hr min: 0%, max: 100% min: 1000hr, max: 3000hr
Not Allowed, Allowed
OneShot, Pulsed ExternAnalog, ExternNetwork, InternAnalog, InternNetwork, HRL, Custom Disabled, ExternAnalog, ExternNetwork, InternAnalog, InternNetwork, Custom
min: 1.0, max: 200.0 min: 0.0sec, max: 900.0sec min: 0.0sec, max: 60.0sec min: 1.0%, max: 100.0% None, RoomRH, Network, HRL None, Internal, ControlInput
min: 1.0, max: 200.0 min: 0.0sec, max: 900.0sec min: 0.0sec, max: 60.0sec min: 1.0%, max: 100.0% None, SupplyHLRH, Network None, Internal, ControlInput

Description/Notes
Import all the controller configuration values onto the SD card. A SD card must be inserted in order to import the values. Export all the controller configuration values onto the SD card. A SD card must be inserted in order to export all the values. Set the frequency of the drain cycle. In general, a more frequent drain cycle is required as the water hardness level rises. The drain cycle setting does not affect the AFEC system. Set the amount of time the humidifier can remain in standby mode until an automatic drain cycle is performed. Define the rate of boiler blowdown or water dilution, in order to minimize water impurities.
Set the time of operation before the humidifier calls for servicing. Select whether to enable the unit to continue producing steam, even when it is due for servicing. When set to Allowed, the unit will continue operating even when a service alarm is active. Select the water filling method for the fill valve: When set to OneShot, water will continuously flow. When set to Pulsed, water will flow in short bursts. Select a preconfigured control mode profile for the modulating humidity demand. Select the Custom option to configure individual settings. (Network option only applicable for BACnet models.) Select a preconfigured control mode profile for the modulating high limit demand. Select the Custom option to configure individual settings. (Network option only applicable for BACnet models.) Only appears if ControlProfile is set to an internal control mode or HumCntrlDemandSrc is set to RoomDemand.
Set the value of the room demand proportional gain.
Set the value of the room demand integral time.
Set the value of the room demand derivative time.
Set the value of the room demand proportional band.
Select the reading source for the room demand. (Network option only applicable for BACnet models.) Select the room demand setpoint source.
Only appears if ModHLProfile is set to an internal control mode or HumCntrlHLSrc is set to SupplyHLDemand.
Set the value of the supply high limit demand proportional gain.
Set the value of the supply high limit demand integral time.
Set the value of the supply high limit demand derivative time.
Set the value of the supply high limit demand proportional band.
Select the reading source for the supply high limit demand. (Network option only applicable for BACnet models.)
Select the supply high limit demand setpoint source.

1.00%

min: 0.00%, max: 100.00%

Set the lower limit deadband value for the humidity demand.

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Page | – 47 –

Sub-Menu

Setting

NtwkTimeout:

Control Physical IO

HumCntrlDemandSrc:

HumCntrlHLSrc:

HumCntrlBinDemandSrc:

ControlInput

[6]

Signal: ControlInput: Min: Max: Bias: SignalType:

RoomRH

[7]

Signal: RoomRH: Min: Max: Bias:

AlwaysShow:

SignalType:

SupplyHighLimRH

[7]

Signal:

SupplyHLRH:

Min:

Max:

Bias:

AlwaysShow:

SignalType:

WtrLvlSig: WtrLvlLowSig:

WtrLvlHiSig:

WaterTemp

[3]

WtrTempSig:

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Default
900sec
ControlInput None None

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Range (* indicates no configuration; display only)
min: 1sec, max: 900sec
None, ControlInput, RoomDemand, Network None, ControlInput, SupplyHLDemand, Network None, BinaryExtDemand

Description/Notes
Define the amount of time the humidifier may attempt to connect to the BACnet or Modbus network before it stops operating due to a communication error. (Only appears if ControlProfile or ModHLProfile are set to InternNetwork or ExternNetwork.) Select the humidity control demand source for modulating humidifiers. (Network option only applicable for BACnet models.) Select the humidity control high limit source for modulating humidifiers. (Network option only applicable for BACnet models.) Select the humidity control demand source for On/Off humidifiers.

0.000V 0.00% 0.00% 100.00% 0.00% 0-10Vdc

• (min: 0.000V, max: 15.000V) * (min: 0.00%, max: 100.00%) min: 0.00%, max: 100.00% min: 0.00%, max: 100.00% min: -10.00%, max: 10.00% 0-10Vdc, 2-10Vdc, 4-20mA, 0-20mA

Displays the value of the control demand analog input signal. Displays the actual value of the control demand analog input. Set the minimum value of the control demand analog input. Set the maximum value of the control demand analog input. Set the bias value for the control demand analog input. Select the signal type for the control demand analog input.

0.000V 0.00% RH 0.00% RH 100.00% RH 0.00% RH
On
0-10Vdc

• (min: 0.000V, max: 15.000V) * (min: 0.00% RH, max: 100.00% RH) min: 0.00% RH, max: 100.00% RH min: 0.00% RH, max: 100.00% RH min: -10.00% RH, max: 10.00% RH
  Off, On
  0-10Vdc, 2-10Vdc, 4-20mA, 0-20mA

Displays the value of the room humidity analog input signal. Displays the actual value of the room humidity analog input. Set the minimum value of the room humidity analog input. Set the maximum value of the room humidity analog input. Set the bias value for the room humidity analog input. Select whether to always display the RoomRH setting, regardless of the configuration selected in the ControlProfile setting. Select the signal type for the room humidity analog input.

0.000V 0.00% RH 0.00% RH 100.00% RH 0.00% RH On 0-10Vdc 0Hz 0.000V 0.000V

• (min: 0.000V, max: 15.000V) (min: 0.00% RH, max: 100.00% RH) min: 0.00% RH, max: 100.00% RH min: 0.00% RH, max: 100.00% RH min: -10.00% RH, max: 10.00% RH Off, On 0-10Vdc, 2-10Vdc, 4-20mA, 0-20mA (min: 0.000V, max: 30000V) (min: 0.000V, max: 10.000V) (min: 0.000V, max: 10.000V)

Displays the value of the duct or supply high limit humidity analog input signal. Displays the actual value of the duct or supply high limit humidity analog input. Set the minimum value of the duct or supply high limit humidity analog input. Set the maximum value of the duct or supply high limit humidity analog input. Set the bias value for the duct or supply high limit humidity analog input. Select whether to always display the SupplyHLRH setting, regardless of the configuration selected in the ModHLProfile setting. Select the signal type for the duct or supply high limit humidity analog input.
Displays the value of the water level feedback signal.
Displays the value of the resistive low water level sensor signal.
Displays the value of the resistive high water level sensor signal.

0.000V

• (min: 0.000V, max: 10.000V)

Displays the value of the water temperature sensor signal. Page | – 48 –

Sub-Menu

Setting WaterTemp:

WaterTempBias:

FoamSig:

CabinetTemperature

[3]

CabTempSig:

CabinetTempBias:

Physical IO
System Extended Config

CabinetTemp:

SteamOutFdbck

[5]

Signal: Bias: Min: Max: PowerOutFdbck:

WaterProbe

[4]

LowPosReading: HighPosReading: AbsLowPosReading: AbsHighPosReading:

ResetFactory:

InstallationDate: AlarmBuzzer: SysLogLevel:

WtrLvlReplace:

MinSteamOut:

DrainInterval:

DrainVolume:

MaxOutput:

www.neptronic.com

Default
122.0°F [50.0°C] 0.00°F [0.00°C] 0.000V
0.000V 0.00°F [0.00°C] 32.0°F [0.0°C]

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Range ( indicates no configuration; display only) (min: 32.0°F, max: 257.0°F) [min: 0.0°C, max: 125.0°C] Units: C, F min: -18.00°F, max: 18.00°F [min: -10.00°C, max: 10.00°C] Units: °C, °F (min: 0.000V, max: 10.000V)

• (min: 0.000V, max: 10.000V) min: -18.00°F, max: 18.00°F [min: -10.00°C, max: 10.00°C] Units: °C, °F (min: -4.0°F, max: 212.0°F) [min: -20.0°C, max: 100.0°C] Units: C, F

Description/Notes Displays the temperature of water in the evaporation chamber.
Set the bias value for the water temperature sensor. Displays the value of the foam sensor signal. Only appears for units with the weather proof enclosure. Displays the value of the cabinet interior temperature sensor signal. Set the bias value for the cabinet interior temperature sensor.
Displays the temperature measured inside of the cabinet.

0.000V 0.000V 0.000V 0.000V 0.00%

• (min: 0.000V, max: 10.000V) min: -1.000V, max: 1.000V min: 0.000V, max: 10.000V min: 0.000V, max: 10.000V * (min: 0.00%, max: 100.00%)

0Hz

• (min: 0Hz, max: 30000Hz)

0Hz

• (min: 0Hz, max: 30000Hz)

0Hz

• (min: 0Hz, max: 30000Hz)

0Hz

• (min: 0Hz, max: 30000Hz)

No

No, Yes

YYYY/MM/DD Disabled Debug
7day

Normal, Disabled None, Emergency, Alert, Critical, Error, Warning, Notice, Info, Debug
Min: 0day, max: 7day

5%

min: 1%, max: 25%

6hr

min: 0hr, max: 24hr

100%

min: 25%, max: 100%

100%

min: 0%, max: 100%

Displays the value of the power output feedback signal.
Set the bias value for the power output feedback signal.
Set the minimum value of the power output feedback signal.
Set the maximum value of the power output feedback signal.
Displays the value of the power output feedback.
Only appears if WtrAutoCalib is set to Off.
Displays the low position value of the water level sensor.
Displays the high position value of the water level sensor.
Displays the absolute low position value of the water level sensor.
Displays the absolute high position value of the water level sensor. Select Yes in order to reset the humidifier back to its original factory configuration settings. WARNING: There is no way to recover previous configurations once the device has been reset. Set the device installation date. Select whether to enable or disable the alarm buzzer sound whenever there is a system warning. This will not affect the Status Display LED. Select the type of information to be stored on log file. (The humidifier must be connected to an SD card.) Set the amount of time the humidifier may run using only the resistive water level probes, if there is an issue with the capacitive probe, before an alarm message is displayed. Set the minimum steam production demand value, below which no steam will be produced. Set the frequency of the drain cycle. In general, a more frequent drain cycle is required as the water hardness level rises. The drain cycle setting does not affect the AFEC system. Define the volume of water that is drained from the chamber, relative to the total capacity of the chamber. Set the maximum steam output of the humidifier relative to its total capacity. (Only applicable for modulating humidifiers.)
Page | – 49 –

Sub-Menu

IdleTime:

Setting

IdleTempStpnt:

BlowdownRate: ServInterval: IdleRinseInterval: ActrDeadband:

ServOperation:

Extended Config

Line Rinse: PwrUpDrain: FillMode:

IdleRinseOn:

IdleRinseOff:
WtrAutoCalib: StartupRinse:

Default 24hr 32°F [0°C] 0% 1000hr 3day 5% Allowed
On Off Pulsed
Off
Off
On Off

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Range (* indicates no configuration; display only) min: 0hr, max: 72hr min: 32°F, max: 140°F [min: 0°C, max: 60°C] Units: C, F min: 0%, max: 100% min: 1000hr, max: 3000hr min: 1day, max: 7day min: 0%, max: 25%
Not Allowed, Allowed
Off, On Off, On
OneShot, Pulsed
Off, On
Off, On
Off, On Off, On

Description/Notes
Set the amount of time the humidifier can remain in standby mode until an automatic drain cycle is performed.
Set the idle temperature setpoint value for the evaporation chamber when there is no demand.
Define the rate of boiler blowdown or water dilution, in order to minimize water impurities.
Set the time of operation before the humidifier calls for servicing.
Set the amount of time the humidifier stays in “Idle” or “Off” mode, before the evaporation chamber undergoes an automatic rinse cycle.
Set the deadband value for the steam actuated valve.
Select whether to enable the unit to continue producing steam, even when it is due for servicing. When set to Allowed, the unit will continue operating even when a service alarm is active. Select whether to perform an automatic pipe line rinse cycle upon each start-up of the humidifier. Select whether to enable an automatic draining cycle each time the humidifier is powered on. Select the water filling method for the fill valve: When set to OneShot, water will continuously flow. When set to Pulsed, water will flow in short bursts. Select whether to enable automatic rinse cycles while the humidifier is turned on and remains in “Idle” or stand-by mode. To select the amount of time the humidifier remains inactive before a rinse cycle is performed, configure the value of the IdleRinseInterval setting. Select whether to enable automatic rinse cycles while the humidifier is turned off and remains inactive. To select the amount of time the humidifier remains inactive before a rinse cycle is performed, configure the value of the IdleRinseInterval setting. Select whether to enable or disable the automatic calibration of the water level sensor. Select whether to perform an automatic tank rinse cycle upon each startup of the humidifier.

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Page | – 50 –

Menu – Integration [Level 5 – Requires level 5 password in order to access]

Sub-Menu

Setting NtwrkOption:

Default BACnet

Range (* indicates no configuration; display only)
BACnet, Modbus

Device

[4]

DeviceName: Location: Description:

DeviceInstance:

HTTPServer

[1]

HttpServerUnits:

BACnetServer [3] Language: ListMode:
Units:

BACnetMSTP [10]

0153001 (0x000255a9)
Imperial
English Integrator Imperial

Metric, Imperial
English, French, Spanish Integrator, Advanced, Factory Metric, Imperial

Network

MaxMaster:

127

min: 1, max: 127

MaxInfoFrames:

AutoBaud: BaudRate: MAC: RxValid: RxInvalid: RxLost: Tx: TxLost:

BACnetIP

[6]

RxValid: RxInvalid: RxLost: Tx: TxLost:

BACnetIPPort:

1
Yes 38400 001 0 0 0 0 0
0 0 0 0 0
47808

min: 1, max: 100
No, Yes 9600, 19200, 38400, 76800

• • • • • min: 0, max: 65535

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Description/Notes Select whether to connect to a BACnet MS/TP or Modbus RTU communication interface on terminal TB2 of the humidifier PCB.
Establish a name for the device. Establish a designated location for the unit. Establish a brief description for the unit.
Define the device instance value.
Select whether to use a metric or imperial system of units for the HTTP server. For models connected to the BACnet network. Select the language for the BACnet server. Select the category of BACnet objects to display. Select whether to use a metric or imperial system of units for the BACnet server. Only appears if NtwrkOption is set to BACnet. Configure MaxMaster value to increase network efficiency when there are less than 127 devices on the network. For optimal efficiency, set value to the highest MAC address in the MS/TP network. Configure the maximum number of information messages the controller may transmit, before it must pass the token to the next controller. Enable or disable automatic baud rate detection. Select the baud rate for data transfer. Set the MS/TP network MAC address.
Displays information on the received communication frames for troubleshooting purposes.
Displays information on the transmitted frames for troubleshooting purposes. For models connected to BACnet IP.
Displays information on the received communication frames for troubleshooting purposes.
Displays information on the transmitted frames for troubleshooting purposes. Set the User Datagram Protocol (UDP) port number. BACnet port number is set by default.

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Page | – 51 –

Sub-Menu

Setting ModbusServer [1] Units: ModbusRTU1In [4] MAC: Autobaud:
PortConfig:
BaudRate: ModbusTCPIP0In [2] KeepAliveTimeOut:

Listening Port:

SMTP

[7]

SSL:

Network

Port:

ServerAddr: From:

To:

Username: Password:

Notify

[3]

Alarm:

Warning:

AppMsg:

BACnetETH

[5]

RxValid: RxInvalid: RxLost: Tx: TxLost:

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Default

Range (* indicates no configuration; display only)

Imperial

Metric, Imperial

1 Yes
No Parity, 2 Stop Bits
19200

min: 1, max: 247
No, Yes No Parity, 2 Stop Bits Even Parity, 1 Stop bit Odd Parity, 1 Stop bit 9600, 14400, 19200, 38400, 57600

5min 502

min: 1min, max: 1440min min: 0, max: 65535

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Description/Notes
For models connected to Modbus. Select whether to use a metric or imperial system of units for the Modbus server. Only appears if NtwrkOption is set to Modbus. Set the Modbus MAC address. Enable or disable automatic baud rate detection.
Select the Modbus communication port configuration.
Select the baud rate for data transfer. For models connected to Modbus TCP/IP Set the amount of time the communication stays open before connection is cut out, when no signal is received from the device. Set the communication port number. Modbus TCP port number is set by default.

Off

Off, On

25
192.168.100.100 Current value
Current value Current value Current value

25, 587

If turned to On, a secure socket layer will be used to encrypt the communication between the device and the email server (Port value must be set to 587 and Username and Password settings must be filled out). If turned to Off, the default socket will be used (use Port 25 to use server without login account or Port 587 if login details for email account have been entered). If set to 25, server to server email transfer is enabled (can only be used if SSL is set to Off). If set to 587, client to server email transfer is enabled.
Configure the server IP address for the email account.
Set the email address that will be sending the humidifier notification messages. Set the email address that will be receiving the humidifier notification messages.
Set the login username for the email account.
Set the login password for the email account.

Off

Off, On

Off

Off, On

Off

Off, On

0

0

0

0

0

If turned to On, then the humidifier alarm messages will be sent to the email configured in the SMTP sub-menu. If turned to On, then the humidifier warning messages will be sent to the email configured in the SMTP sub-menu. If turned to On, then the humidifier event messages will be sent to the email configured in the SMTP sub-menu. For models connected to BACnet Ethernet.
Displays information on the received communication frames for troubleshooting purposes.
Displays information on the transmitted frames for troubleshooting purposes.
Page | – 52 –

Sub-Menu Communication

Setting

IPSettings

[10]

DHCP:

RstIPSetting:

StaticAddress: StaticSubnetMask: StaticDefaultGateway: StaticDnsServer: ActualAddress: ActualSubnetMask: ActualDefaultGateway: ActualDnsServer:

ETHSettings

[1]

EthernetMacAdd:

Default
Inactive
No 192.168.1.100 255.255.255.0 192.168.0.100 192.168.10.50 Current value Current value Current value Current value
Current value

Range (* indicates no configuration; display only)

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Description/Notes

Inactive, Active No, Yes

Select whether to enable Dynamic Host Configuration Protocol (DHCP) to automatically provide an IP address. Select whether to restart the IP module, in order to allow recent parameter modifications to be effective. Configure the static IP address. Configure the static subnet mask. Configure the static default gateway. Configure the static DNS server. Displays the actual IP address. Displays the actual subnet mask. Displays the actual default gateway. Displays the actual DNS server.

Displays the MAC address of the Ethernet interface. (Only applicable if using an Ethernet connection.)

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Page | – 53 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

List of Alarms

Table 10 – List of Alarms

Display AirFlow SupplyHighLimit Interlock
HighLimitCutout ThermalCutout WtrLvlLow WtrLvlHigh WaterTemp CabinetTemp FoamSensor

Description Indicates that the airflow sensor is open. This fault does not trigger the alarm contact (no message will be displayed), but will prevent the humidifier from running. Verify that the signal from the airflow sensor is present at the controller’s input on the PCB and verify wiring. Indicates that the high limit item is open. Verify that the signal from the supply high limit sensor is present at the controller’s input on the PCB and verify wiring. Indicates that the interlock and the cut-out circuitry are open. This fault does not trigger the alarm contact (no message will be displayed), but will prevent the humidifier from running. Verify that the signal from the interlock sensor is present at the controller’s input on the PCB and verify wiring. Indicates that the high limit cutout has been activated due to a humidity reading that exceeds the high limit setpoint. Ensure that the high limit humidistat is operating correctly and that the distance between the sensor and the steam dispersion manifold is sufficient (15 ft [4.6 m]). Indicates that the thermal switch circuit is open. Verify that the wire going to the thermal switch connection on the PCB is properly connected. Indicates that the resistive low water level sensor is defective or incorrectly wired. Check sensor and verify
wiring.
Indicates that the resistive high water level sensor is defective or incorrectly wired. Check sensor and
verify wiring.
Indicates that the evaporation chamber water temperature sensor is defective or incorrectly wired. Check
sensor and verify wiring.
Indicates that the cabinet temperature sensor is defective or incorrectly wired. Check sensor and verify wiring. (Only applicable for humidifiers having the weatherproof option.)
Indicates that the foam cutout sensor is defective or incorrectly wired. Check sensor and verify wiring.

ContactorsFuse MemoryCard (Warning) USB Device (Warning) Foam (Warning) ManWtrCalib (Warning) WaterLevel (Warning)
WaterLevel (Alarm)
FailedPump FillTimeout BlockedPiping HeatTimeout
Overheat
WaterLeak TankBlocked
RefillDelay
NtwkCtrlSt

Indicates that there is an issue with the printed circuit board fuse. Check the status of the fuse and replace
it if defective.
Indicates that the SD card has been detected, but it is not operating correctly or is non-functional. Verify the SD card and replace if defective. Indicates that the USB device has been detected, but it could not be read or is not operating correctly. Verify the functionality of the USB device and replace if defective. If Detected is displayed, it indicates that the foam sensor has detected foam and the humidifier is now draining. Once the drain cycle has ended, the warning message will disappear.
Indicates that the water level sensor must be manually calibrated. See Manual Water Level Calibration section on page 56 for details. (Only applicable if WtrAutoCalib is set to Off.) If Replace is displayed, it indicates that there a problem with either the capacitive or resistive water level probes. Ensure that all the water level probes have been wired properly. If the error persists, the warning message will change into the alarm message described below. If Defect is displayed, it indicates that the water level sensor is defective or not working properly. Verify its operation and replace it if necessary. If the sensor is replaced, the humidifier will need to be turned on while there is a humidity demand in order to recalibrate the water level sensor. If NoCalib is displayed, it indicates that the water level sensor is not calibrated or must be recalibrated. Ensure that WtrAutoCalib is set to On for automatic calibration. If WtrAutoCalib has been changed to Off, ensure that the water level sensor has been manually calibrated. Indicates that there was an error during draining due to a pump failure. Verify that the drain pump is operating correctly and that it is not being hindered or obstructed. Indicates that the water level sensor has not reached the desired value within the programmed delay. Verify and remove any obstructions in the water inlet line and verify that the shut-off valve is not closed. Indicates that there was an error during draining due to a blockage in the pipes. Verify and remove any obstructions in the piping and ensure that the drain outlet is not clogged. Indicates that the water temperature in the evaporation chamber has not reached the boiling point within the programmed delay. Verify the temperature of the supply water. Indicates that the evaporation chamber temperature sensor has detected a temperature reading greater than or equal to 221°F (105°C). Verify the operation of the water level sensor and ensure that the water supply piping is not obstructed. Indicates that a water leak has been detected. Verify the water line for signs of leaks and ensure that all piping and water connections have been properly installed and secured. Indicates that there was an error while filling the evaporation chamber due to a blockage in the pipes. Verify and remove any obstructions in the piping and ensure that the water inlet is not clogged. Indicates that the evaporation chamber has not been refilled with more water within the programmed delay after it has begun evaporating, due to a blockage in the pipes. Verify and remove any obstructions in the piping and ensure that the water inlet is not clogged. Indicates that the communication attempt to the BMS server has exceeded the delay defined by the NtwkTimeout setting. Verify the wiring between the humidifier and the BACnet or Modbus network and ensure proper connection. (Only applicable for humidifiers having the BACnet or Modbus option).

Alarm Reset Automatic Automatic Automatic
Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic Automatic
Manual
Manual
Manual Manual Manual Manual Manual Manual Manual Manual
Manual *

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Page | – 54 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Display HRLState AntiFreeze ServiceDue

Description Indicates that there is a communication error when attempting to connect to the HRL24 controller. Verify the wiring between the humidifier and the HRL24 and ensure that the controller is functioning properly. (Only applicable for humidifiers connected to the HRL24 controller). If Drain is displayed, it indicates that the drain valve is open, and the unit will empty itself to avoid freezing. This ensures that the unit will produce steam normally when it will be switched ON by a demand. Indicates that the due date for servicing the humidifier has arrived. See Service section on page 60 for details.

• Use Reset Alarms function in Request setting (see page 46). ** Use Reset Counters function in Request setting (see page 46).

Alarm Reset Manual Manual Manual **

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Page | – 55 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Manual Water Level Calibration

If the humidifier is not equipped with the pure DI humidifier option and uses ultrapure water, the water level sensor must be manually calibrated to obtain a more accurate sensor reading. To turn off the automatic calibration of the water level sensor, access the WtrAutoCalib setting located in the Extended Config sub-menu of the Installation menu and set its value to Off. Once this is done, the water level sensor will need to be manually calibrated by using the following steps:

1. To view the water level sensor, remove the front access panel.

2. To begin the manual water level calibration process, access the Request settings located in the Command sub-menu of the Service menu, and set its value to WaterCalib.

Step 1.

The water level sensor will then initiate a drain cycle. Wait until it has finished draining. The draining process can be stopped at any time by pressing and holding Enter for 3 seconds.

Step 2.

Verify that no water remains in the water level sensor and press and hold Enter for 3 seconds to proceed. If the water has not been drained completely, open the manual drain valve to remove the remaining water.

Step 3. Step 4.

The water level sensor will then start filling until it reaches the resistive low probe. The automatic filling process can be stopped at any time by pressing and holding Enter for 3 seconds.
Once the Low level message appears on the controller, verify that the water has reached the resistive low water level probe.
· If the water has not reached the resistive low water level probe, use the + button to resume filling.
· If the water level sensor has been overfilled, open the manual drain valve to remove the additional water.
· Once the water has reached the resistive low probe, press and hold Enter for 3 seconds to proceed.

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Page | – 56 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Step 5. Step 6.

The water level sensor will then start filling until it reaches the resistive high probe. The automatic filling process can be stopped at any time by pressing and holding Enter for 3 seconds.
Once the High level message appears on the controller, verify that the water has reached the resistive high water level probe.
· If the water has not reached the resistive high water level probe, use the + button to resume filling.
· If the water level sensor has been overfilled, open the manual drain valve to remove the additional water.
· Once the water has reached the resistive high probe, press and hold Enter for 3 seconds to proceed.

3. The manual water level calibration process is now complete.
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Page | – 57 –

Start-up Procedure

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Initial verification and start-up must be carried out by suitably qualified personnel.
It is strictly recommended to follow this start-up procedure in order to avoid any anomaly resulting from inaccurate installation of the components.
Initial Verification

Clearance

Ensure that the humidifier cabinet is installed in a location in which the humidifier can be serviced correctly.

2. Verify that the power supply (voltage) conforms to the appliance name plate on

Electrical Supply

the side of the humidifier. Confirm that 24Vac is present between terminals TB4 1&2 on the printed circuit

board.

4. Ensure that water is supplied to the humidifier and that a shutoff valve is placed

outside the humidifier.

5. With the water shutoff valve turned on, check that the drain connections are

Water Supply

connected to the main drain line with sufficient diameter. Ensure that there are

no apparent leaks.

6. Confirm that the drain piping is properly connected with a pitch of at least ¼”

(6.5mm) per foot (300mm).

7. Verify that the steam distributors are properly installed into the ventilation duct.

Clean Steam 8. Verify that the flexible steam hoses and rigid steam supply pipes are shorter

than 16 ft (5 m) in total, are properly sloped and have condensation “S” traps

wherever required.

9. Confirm that raw steam is supplied to the humidifier and that the supply line is

hot upstream the control valve. The pressure must not exceed 15 PSI (103.4

kPa).

Raw Steam 10. Confirm that the shut-off valve located outside the humidifier is closed. With the

Supply

shut-off valve turned on, check for leaks or hissing sounds.

11. When using raw steam supply, verify the type and size of the condensate return

steam trap. The steam trap must be of float type and of sufficient dimension,

according to the capacity.

12. Ensure that the control valve is properly connected to the output control signal of the humidifier.

13. Ensure that the Airflow switch is properly installed and connected to the printed circuit board. If an Airflow switch is not used, verify that a jumper is connected between terminals TB3 1&2.

14. Ensure that the High limit duct humidistat is properly installed and connected to the printed circuit board. Verify that the setpoint is properly adjusted. If a High limit duct humidistat is not used, verify that a jumper is connected between terminals TB3 1&3.
Controls 15. Ensure that the Interlock is properly connected to the printed circuit board. If the
Interlock is not used, verify that a jumper is connected between terminals TB3 1&4.

16. If a room or duct humidistat is used, verify that it is correctly installed and properly connected to the humidifier. Verify that the setpoints are properly adjusted.

17. Turn the power on using the disconnect switch or circuit breaker.

18. Confirm the control set-up of the humidifier and verify that the setpoints are properly adjusted.

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Page | – 58 –

Start-Up

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

1. Proceed to start-up the humidifier, as follows:

a) Turn on the humidifier by pressing and holding the Power button for 3 seconds. Verify that the controller Status Display LED is blue.

b) Verify that there is a humidity demand displayed on the LCD screen of the humidifier.

Start-up

c) Ensure that the water supply valve connected to the humidifier is turned on and that water is flowing directly to the humidifier water supply inlet. Ensure that the water shut off valve is turned off.
d) Verify the water level as water is filling the evaporation chamber by using the control panel to access the WaterLevel setting located in the Physical IO sub-menu of the General menu. Ensure that there are no water leaks along the water line.

e) Once the evaporation chamber has been filled, observe the system for water and steam leaks during several minutes of operation.

2. Check the location of the Airflow switch in the system and its operation by

Safety Test

stopping the fan. With no air movement, the humidifier should automatically

stop.

3. Turn off the humidifier by pressing and holding the Power seconds.

button for 3

4. Conduct a drain cycle by pressing and holding the Drain button for 3

Drain and Reset

seconds. Ensure that the evaporation chamber has been emptied.

5. Once the drain cycle is complete, restart the humidifier by pressing and holding

the Power button for 3 seconds.

6. Reset the Airflow switch if needed.

End 7. The humidifier is now ready for normal operation.

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Page | – 59 –

Service

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

WARNING: Danger of hot water. Drain water before servicing.
The humidifier requires regular periodic service to ensure efficient and trouble-free running. Regular service involves manually cleaning the humidifier and the strainer located on the steam line. Generally, frequency of cleaning can range from two months to once a year, depending on the following factors:
· Quality of water · Frequency of automatic drain cycles · Demand placed on the humidifier All SKS4 humidifiers are programmed for 1000 hours of operation. This is a default factory setting. To view the number of hours the humidifier has run and the number of service hours, use the control panel to access the Service Menu (see page 46 for more details).
After 1000 hours of operation have passed, the Status Display LED on the control panel will turn red, indicating that the humidifier is due for servicing. Although the humidifier will continue to operate, it is imperative that service is performed as soon as possible, in order to ensure proper functionality.
Cleaning the Humidifier
Cleaning the humidifier involves the following steps:
Stage 1 – Drain the Evaporation Chamber Stage 2 – Shut Down the Electrical Supply Stage 3 – Disassemble the Humidifier Stage 4 – Clean the Components Stage 5 – Reassemble the Humidifier Stage 6 – Restart the Humidifier
Stage 1 – Drain the Evaporation Chamber
Before commencing the cleaning procedure, ensure that the evaporation chamber is cool and comfortable enough to handle, as the evaporation chamber and its contents can be extremely hot and can cause burning. To allow the evaporation chamber to cool, initiate a drain cycle:
1. Press and hold the Power button for 3 seconds to switch off the humidifier.
2. Press and hold the Drain button for 3 seconds to initiate a drain cycle and empty the evaporation chamber.
Stage 2 – Shut Down the Electrical Supply
CAUTION: Risk of electric shock. The electric supply of the humidifier must be shut down. Disconnect the power at the External Breaker/Fused Disconnect before commencing servicing. Once the drain cycle is complete, remove the power supply to the humidifier at the disconnect switch or the breaker.

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Page | – 60 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Stage 3 – Disassemble the Humidifier
1. Remove the painted top cover by manually turning the two thumb screws located on each side of the humidifier. 2. Remove the second cover made of stainless steel, by using the wrench found underneath the top cover (supplied)
in order to remove the nuts connected to the stainless steel cover.
3. Remove both scale pans from the humidifier.

Illustration 47 – Removal of Scale Pans
Stage 4 – Clean the Components
1. Clean the scale pans and the evaporation chamber: · Empty out all accumulated scale build-up from the scale pans and remove the residue that has accumulated inside the chamber. · To clean out any remaining scale, use a stiff brush (synthetic filament only) and some vinegar or any weak acid suitable for cleaning stainless steel.
WARNING: The use of a wire brush or any non-recommended acid will void the warranty.
· Do not scrape off the walls of the scales pans or the evaporation chamber. · Ensure that the water inlet aperture is not blocked. 2. Remove the excess water using the manual drain valve, in order to clean the scale pan area. 3. Close the manual drain valve.

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Illustration 48 – Manual Drain Valve

Page | – 61 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Stage 5 – Reassemble the Humidifier
1. Reinstall both scale pans. Ensure that the drain hole remains free from any obstruction. 2. Close the stainless steel cover using the wrench (supplied) and ensure that it is tightened properly to prevent
steam loss. 3. Close the painted top cover by turning the four thumb screws. 4. Turn the power back on at the disconnect switch or the breaker.
Stage 6 – Restart the Humidifier
1. Press and hold the Power button for 3 seconds to power on the humidifier. 2. Conduct a performance test by verifying the water level of the evaporation chamber as it is filled with water. Verify
that there are no leaks.
3. Conduct a drain test by turning off the humidifier using the Power button and performing a drain cycle using the Drain button .
4. Restart the humidifier to resume normal operation by pressing and holding the Power button for 3 seconds. 5. To reset the service counters and clear the alarm warning after servicing:
a. Using the control panel, access the Request setting located in the Command sub-menu of the Service menu. b. Select the Reset Counters value and press Enter to reset the service counters. 6. Ensure that the drain cycles are set for every 6 hours of operation. This is the factory default setting and is recommended for city water.
· To configure the drain cycle frequency, use the control panel to access the DrainInterval setting located in the Quick Config or Extended Config sub-menus of the Installation menu.
After the water boils for 6 hours in the chamber, it is laden with minerals and solutions. This affects the humidity output and the efficiency of the humidifier. Diluting the boiling water with a drain cycle will improve the performance of the humidifier.
Strainer Maintenance
Perform the following steps for strainer maintenance: 1. Turn off the steam supply coming to the strainer on the steam supply pipe. 2. Unscrew the meshing cap.

Illustration 49 – Meshing Cap 3. Clean the meshing cap by removing any debris located inside of it. 4. Reassemble the meshing in the strainer body using the cap. 5. Reopen the steam supply on the steam supply line.
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Page | – 62 –

Troubleshooting

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Table 11 – Troubleshooting Guide

Problem

Possible Cause

Power is not being supplied to the humidifier.

Humidifier does not operate (Screen turned Off)

The low voltage fuse is open.
Wire harnesses inside the humidifier are not secured properly.

Humidifier does not operate (Screen turned On, Status Display LED: Off)
Humidifier does not produce steam (No demand)
No water inside the evaporation chamber or Humidifier does not stop draining
Humidifier does not drain

The humidifier is not powered on.
No analog signal detected. Air flow is not detected by air pressure switch. High limit humidistat is open. Interlock contact is open. Control wires are not properly secured to the terminal blocks. Humidifier is being filled with water but has not yet reached or does not reach the high limit of the water level sensor. Humidifier is not being filled with water. Drain valve is clogged. During a drain or foaming cycle, the water level sensor has sensed that the water level has not decreased.

Humidifier is always on Foam cycle (FoamSensor setting displays Foam)

Excessive foaming condition inside the evaporation chamber.

Humidifier is operating and the Status Display LED is Red (ServiceDue setting displays On)
Humidifier does not operate (Screen turned Off, Status Display LED: Blue)
Humidifier is producing steam (Screen turned Off, Status Display LED: Blue)

The humidifier is due for servicing.
The following components can be the cause of this problem: water level sensor, PC board or LCD display. The display FFC cable is not connected properly. The LCD display is defective.

Corrective Action Check the main power supply and fuses. Verify the disconnect switch and the circuit breaker. Check the transformer and the low voltage fuse. Verify that the low voltage circuit is complete. Check the wires harnesses and the main PC board. Verify that all connections have been made properly.
Verify that the Power button has been pressed and held for 3 seconds for correct activation.
Verify the setting of the control input.
Check the fan operation.
Check the operation of the high limit humidistat. Check the interlock contact. Verify the connections of the wires to the control terminal blocks. – Verify that the drain valve is open. – Check if the shutoff valve on the water supply line is open. – Verify the operation of the fill valve. – Check that the fill valve strainer and the external strainer are not blocked. Check the drain valve. Verify that the drain pump, the fill and drain water pipe connections and the water level sensor chamber are not obstructed.
– Verify the quality of the supply water. – Verify if chemical products were used to clean the evaporation chamber during maintenance. Rinse the chamber properly with water. – Check the setting of the drain cycle. Reduce the time between drain cycles.
Service the humidifier (see Service section on page 60). Use Request setting in Service menu to reset counters (see page 46).
Call factory for troubleshooting instructions.
Verify that the connections of the FFC cable are properly secured and are on the correct side. Replace the LCD display.

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Page | – 63 –

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
Exploded View and Bill of Material
General
5
4
3 2
6 7 1

Illustration 50 – General Exploded View
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Page | – 64 –

Item 1

Description
Scale pans

2

Heat exchanger 1

3

Heat exchanger 2

4

Evaporation chamber gasket

5

Evaporation chamber cover

6

Heat exchanger flange washer

7

Heat exchanger gasket

Actuated steam control valve

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

Model
SKS4-50-SLP to SKS4-290-SLP SKS4-390-SLP to SKS4-1250-SLP
SKS4-050-SLP SKS4-100-SLP SKS4-130-SLP SKS4-190-SLP SKS4-290-SLP SKS4-390-SLP SKS4-500-SLP SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP
SKS4-1250-SLP
SKS4-050-SLP to SKS4-130-SLP SKS4-190-SLP and SKS4-290-SLP SKS4-390-SLP and SKS4-500-SLP SKS4-690-SLP to SKS4-1250-SLP SKS4-050-SLP and SKS4-130-SLP SKS4-190-SLP and SKS4-290-SLP
SKS4-390-SLP SKS4-500-SLP SKS4-690-SLP SKS4-950-SLP SKS4-1250-SLP SKS4-050-SLP to SKS4-130-SLP SKS4-190-SLP and SKS4-290-SLP SKS4-390-SLP to SKS4-950-SLP SKS4-1250-SLP SKS4-050-SLP to SKS4-130-SLP SKS4-190-SLP and SKS4-290-SLP SKS4-390-SLP to SKS4-1250-SLP SKS4-050-SLP to SKS4-130-SLP SKS4-190-SLP and SKS4-290-SLP SKS4-390-SLP to SKS4-690-SLP, SKS4-1250-SLP SKS4-950-SLP

Part Number
SPS9000-7R SPS9000-8R
SPS20050 SPS20100 SPS20130 SPS20190 SPS20290 SPS20390 SPS20500 SPS20690 SPS20950 SPS21250A
SPS21250B
SPS6100 SPS6200 SPS6300 SPS6400 SPS9010-12 SPS9020-12 SPS9030-12-390 SPS9030-12-500 SPS9040-12-690 SPS9040-12-950 SPS9050-12 SPS20100-8R SPS20290-8R SPS20500-8R SPS201250-8R SPS60130 SPS60290 SPS60500 SF SKDB0075BAM SF SKDC0140BAM
SF SKDD0200BAM
SF SKDE0280BAM

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Page | – 65 –

Plumbing Compartment

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual
14 13 12

Item 8 9 10 11
12
13 14

11

8

10

9

Illustration 51 – Plumbing Compartment Exploded View

Description
Drain valve Drain pump Water supply valve (2-way) Water supply valve (3-way)
Water level sensor
Water temperature sensor Foam sensor

Model
All models All models SKS4-390-SLP to SKS4-1250-SLP All models SKS4-050-SLP SKS4-100-SLP to SKS4-1250-SLP All models All models

Part Number
SP4233-59 SPG4101 SPG4104 SP6008 SW SK4WLTR1-HEAD SW SK4WLTR2-HEAD SW SK4TEMPSENS-12 SWGAFECPROBE-ASS

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Page | – 66 –

Electrical Compartment

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

15 16 17
18

Item 15 16
17
18

Illustration 52 – Electrical Compartment Exploded View

Description
Display

Model
All models

Printed circuit board Transformer
Disconnect switch

All models
SKS4-050-SLPA to SKS4-290-SLPA SKS4-050-SLPB to SKS4-290-SLPB SKS4-050-SLPC to SKS4-290-SLPC SKS4-390-SLPA to SKS4-1250-SLPA SKS4-390-SLPB to SKS4-1250-SLPB SKS4-390-SLPC to SKS4-1250-SLPC
All models

Part Number
SW SKS4DISPLAY-AS
NW SKS4MAINSS SP3380 SP3308
DP10-3103 SP3390 SP3392 SP3389
DP13-3004

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Page | – 67 –

Weather Proof Enclosure

SKS4 Steam to Steam Humidifier
Installation Instructions and User Manual

19 20

Item 19 20 21

21

Illustration 53 – Weather Proof Enclosure Exploded View

Description
Thermostat

Model
All outdoor models

Cooling fan

All outdoor models

Motorized drain valve

All outdoor models

Part Number
NF TRO24-EXT1 SP3001 SP6016

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Page | – 68 –

Notes

400 Lebeau blvd, Montreal, Qc, H4N 1R6, Canada www.neptronic.com
Toll free in North America: 1-800-361-2308 Tel.: 514-333-1433 Fax: 514-333-3163
Customer service fax: 514-333-1091 Monday to Friday: 8:00am to 5:00pm (Eastern time)

References

• Neptronic | Home - Humidifier Distributor & HVAC Products
• Neptronic | Home - Humidifier Distributor & HVAC Products

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