TRX085 Residential Condensing Gas Boiler Instructions

: June 12, 2024
: NTI

Table of Contents

TRX085 Residential Condensing Gas Boiler
Product Information
Product Usage Instructions
Cascade System Installation
Table of Contents
Part 1 – General Safety Information
4, b-FL5 = Follower #5, b-FL6 = Follower #6, b-FL7 = Follower #7
Current Temperature
Quick Access Menus
CASCADE MANAGEMENT
EMERG Emergency Mode
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

TRX085 Residential Condensing Gas Boiler

TRX085-Residential-Condensing-Gas-Boiler

Product Information

The TRX and FTVN Cascade System Installation is designed for residential condensing gas boilers. The heat exchanger of the boiler bears the ASME H Stamp. The package includes various components such as BUS Connectors, SYS Connector, System Sensor, and Instructions.

Item #1: BUS Connectors (p/n 87101) – Quantity: 8
Item #2: SYS Connector (p/n 87102) – Quantity: 1
Item #3: System Sensor (p/n 84010) – Quantity: 1
Item #4: Instructions (p/n 87098) – Quantity: 1

Product Usage Instructions

Danger: This document must only be used by a qualified installer/service technician. Before installing, read all instructions in the installation manual and these instructions specifically for Cascade System. Perform the steps in the given order to avoid property damage, personal injury, or death.

Warning: Improper installation, adjustment, alteration, service, or maintenance can void the product warranty and cause property damage, personal injury, or death. Also, this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Notice: The manufacturer reserves the right to make product changes or updates without notice. The surfaces of these products contacted by potable water contain less than 0.25%lead by weight as required by the Safe Drinking Water Act.

Part 1 – Cascade Water Piping
Follow the piping instructions in the installation manual to avoid voiding the warranty and potential property damage, personal injury, or death.

Part 2 – Cascade Control Set-Up
Refer to the installation manual for cascade control set-up instructions.

Part 3 – Cascade Wiring
Refer to the installation manual for cascade wiring instructions.

Part 4 – Cascade Controls
This section covers the master boiler homescreen overview, follower boiler homescreen overview, cascade master menu structure, and cascade follower menu structure. Refer to the provided documentation for detailed instructions.

Part 5 – Troubleshooting
If you encounter any issues with the cascade system, refer to the troubleshooting section for assistance.

Caution: The maximum number of boilers that can be installed in a cascade system is eight (8). Installing more boilers than the specified limit can cause system problems, property damage, premature boiler failure, and will not be covered by the product warranty.

Make sure to follow all instructions carefully and consult a qualified installer/service technician if needed.

TRX and FTVN

Cascade System Installation

Residential Condensing Gas Boiler

Heat Exchanger Bears the ASME “H” Stamp

Included with TRX/FTVN Cascade Kit (p/n 87099):

Item #

Description

Quantity

1

BUS Connectors (p/n 87101)

8

2

SYS Connector (p/n 87102)

1

3

System Sensor (p/n 84010)

1

4

Instructions (p/n 87098)

1

DANGER
This document is provided in addition to other documentation and does not replace the installation manual. This document must only be used by a qualified installer / service technician. Read all instructions in the installation manual before installing. Then, if installing a Cascade System, read these instructions. Only then proceed with installation. Perform steps in the given order. Failure to do so could result in substantial property damage, severe personal injury, or death.

87098 Revision Date 10.7.20

WARNING
Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause property damage, severe personal injury, or death.
California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
NOTICE
The manufacturer reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature.
The surfaces of these products contacted by potable (consumable) water contain less than 0.25% lead by weight as required by the Safe Drinking Water Act, Section 1417.

PPaartr1t -1C-aGsceandeerWaaltSear PfeiptiyngInformation

CAUTION
A maximum of eight (8) models may be installed in a cascade system. Installing more than the maximum amount of boilers in a cascade system will result in system problems, property damage, and premature boiler failure. Such problems ARE NOT covered by product warranty.
On Boiler Only Heating Installation Unless a boiler is connected to an Upstream IWH, cap the DHW fitting as indicated in the figures and disconnect the electrical connection of the 3-way valve motor while the boiler is operating in central heating mode. This will lock the valve motor in central heating mode and ensure freeze protection operates properly. Failure to disconnect the valve may disable boiler freeze protection and result in property damage.
In mixed temperature applications, a mixing valve is required for the protection of low temperature loops.

WARNING
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.
NOTES: 1. These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. Primary / Secondary Loop: All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees. 4. The minimum individual boiler pipe size of DHW piping should be ¾” diameter and CH piping should be 1″ in diameter. 5. Circulators are shown with isolation flanges. The alternative is standard flanges with full port ball valves. Purge valves can be used with circulator
flanges as an alternative. 6. Piping shown is Primary/Secondary. 7. Install a minimum of 12 diameters of straight pipe upstream of all circulators. 8. Unit is equipped with built-in primary pump. This pump is sized to ensure proper flow rate through the boiler heat exchanger and related piping
provided the piping is done correctly. 9. IWH Applications – a mixing valve is recommended if the DHW temperature is set above 119oF.
2

Part 1 – General Safety Information

3

RT

TS

OD

S

MASTER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

FOLLOWER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

FOLLOWER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

RT

OD

DOWNSTREAM
INDIRECT FIRED WATER HEATER
TS

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

UPSTREAM
INDIRECT FIRED WATER HEATER
TS
S

NOTICE

Piping for Models: TRX085, TRX120, TRX110C, TRX150C

In this plumbing application, parameter 25.1.6 needs to be adjusted to setting

This ensures the CH pump will not operate during DHW demands.
Follow the Establishing Boilers as Master and Followers instructions when connecting to the BUS terminals. Connecting to the BUS terminals without following these instructions could damage the main PCB.

Figure 1 – Three (3) Cascaded Boilers with Upstream or Downstream Indirect Water Heater – Piping and Wiring for TRX085, TRX120, TRX110C, TRX150C Models ONLY

RT

TS

OD

S

MASTER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

FOLLOWER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

FOLLOWER
120VAC JUNCTION BOX

DHW PUMP

CH PUMP

RT

OD

DOWNSTREAM
INDIRECT FIRED WATER HEATER
TS

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

120V 120V 120V 120V 120V 120V

T B

5V IN

BUS TT2 OD TNK SYS TT1

PCB / CONTROL PANEL

UPSTREAM
INDIRECT FIRED WATER HEATER
TS
S

Part 1 – General Safety Information
4

Piping for Models: TRX150, TRX199, TRX199C FTVN085, FTVN110, FTVN150, FTVN199, FTVN110C, FTVN150C, FTVN199C

NOTICE
In this plumbing application, parameter 25.1.6 needs to be adjusted to setting

This ensures the CH pump will not operate during DHW demands.
Follow the Establishing Boilers as Master and Followers instructions when connecting to the BUS terminals. Connecting to the BUS terminals without following these instructions could damage the main PCB.

Figure 2 – Three (3) Cascaded Boilers with Upstream or Downstream Indirect Water Heater – Piping and Wiring for TRX150, TRX199, TRX199C, and all FTVN models ONLY

Part 1 – GPeanrte2ra- lCSasacfaedteyCIonnfotrroml Saetti-oUnp
When setting up a cascade system, one boiler must be configured as a Master and the other boilers must be configured as Followers. Establishing Boilers as Master and Followers: NOTE: Disconnect the WiFi PCB on each Follower boiler prior to setting up the cascade system. Only the Master boiler should be connected to WiFi. See Figure 3.

Disconnect here on every Follower boiler
CN18 Rd
Wh

Wh

Gr Bk

1 1

120V 120V 120V 120V 120V 120V CN7

TB

5V IN

CN4

BUS TT2 OD TNK SYS TT1

GN L 120 VAC

CN24

CN9

CN1

FUSE 5A

1 CN22

1

Return temp.

probe

Bl

Outlet

Bl Rd

temp. probe

Rd

1 CN26

CN23
CN6 CN10
1

CN2

Br

Flue temp.

Br

probe

CN16

1

1 CN19 1 CN12

Wh

CN3

Bl

GATEWAY WIFI

D.H.W.

Flow

Gry

Br

Rd

CN5

Bl

Bk

1 CN20

sensor

Br

Water

Br Br

1

pressure switch

Bk Bk Br

CN8

Bk

D.H.W

Rd
Figure 3 – Disconnect the WiFi PCB on each Follower Boiler

NOTE: Start with all boilers powered OFF and with no wires connected to each boiler’s BUS connection.

1. Disconnect WiFi PCBs – Permanently disconnect the WiFi PCB on each Follower boiler. Only the Master boiler can be connected to WiFi. 2. Establish the Cascade Master – Connect power to the boiler chosen as the Master. Enter the Technical Menu and set parameter 0.4.6 =
b-MAS. Connect the System Sensor at “SYS” of the Master boiler with the SYS connector. See Part 3 – Cascade Wiring. The System Sensor and SYS connector are included in this kit. 3. Establish Followers – Connect power to the boiler chosen as Follower #1. Enter Technical Menu and set parameter 0.4.6 = b-FL1. Repeat for remaining Follower boilers, taking care to set a unique value for each Follower, e.g. “b-FL2″ through b-FL7”. NOTE: Each Follower must have a unique address. Giving boilers the same address will result in a Configuration Conflict (CONFL) error code. 4. Establish Communication – DISCONNECT POWER TO ALL BOILERS. Daisy-chain (connect in parallel) the BUS terminal of all boilers with the BUS connectors included in this kit. Take care to maintain the correct polarity of “B” and “T” terminals. Connect power to all boilers. Program the Cascade System (Master Boiler): The following parameters must be configured at the boiler configured as the Master (0.4.6 = b-MAS). NOTE: Set parameter 0.4.6 prior to adjusting other settings using the Establishing Boilers as Master and Followers procedure. Menu level 25 is not accessible unless 0.4.6 is set to b-MAS.

Parameter

Description

Value

Default Setting

0.4.6

Cascade Boiler Address (Master boiler must be set to b-MAS)

UNDEF = undefined, b-SIN = single boiler, b-MAS = master boiler, b-FL1 = Follower #1 boiler, b-FL2 = Follower #2, b-FL3 = Follower #3, b-FL4 = Follower

4, b-FL5 = Follower #5, b-FL6 = Follower #6, b-FL7 = Follower #7

b–SIN

2.0.1

DHW Preheating

0 = Disabled, 1 = Enabled

1

Enables / disables DHW Comfort Function on Combi models (not applicable to non-Combi models) – see par. 25.2.1. NOTE: When connected to a cascade system, DHW COMFORT Function is automatically turned on.

Combi Models – DO NOT MODIFY

0 = Combi

0

2.2.8

Non-Combi Models Type of DHW control for Upstream IWH

1 = Storage with Tank Sensor 2 = Storage with Aquastat

2

Applicable when an Upstream IWH is connected directly to the Master boiler. Not applicable for Combi models. NOTE: An Upstream IWH cannot be connected to a Master boiler when there is a Downstream / System IWH, i.e. when 25.2.2 = 1 or 2.

2.10.3

Emergency Setpoint

68-179°F

113°F

Sets Master boiler operating temperature when there is a malfunction of the BUS circuit. Can also be adjusted via the CH +/- buttons of the respective boiler, while operating in Emergency mode.

4.2.0

Temperature Range of CH System (Zone 1 TT1)

0 = Low Temp (68-122°F) 1 = High Temp (86-179°F)

1

Establishes range of parameters 4.2.5 and 4.2.6. Refer to parameter 5.2.0 and 6.2.0 for CH Zone 2 and 3.

4.2.5

Maximum CH Temperature Setting (Zone 1 TT1)

68-122°F (when 4.2.0 = 0) 86-179°F (when 4.2.0 = 1)

120 (4.2.0 = 0) 179 (4.2.0 = 1)

Sets the maximum allowable boiler operating temperature for CH Zone 1, limiting Automatic Temperature Control and manual adjustment from the User Menu. Refer to parameter 5.2.5 and 6.2.5 for CH Zone 2 and 3.

5

Part 1 – General Safety Information

Parameter

Description

Value

Default Setting

Minimum CH Temperature Setting (Zone 1 TT1)

68-122°F (when 4.2.0 = 0) 86-179°F (when 4.2.0 = 1)

80 (4.2.0 = 0) 120 (4.2.0 = 1)

4.2.6

Sets the minimum allowable boiler operating temperature for CH Zone 1, limiting Automatic Temperature Control and manual adjust-

ment from the User Menu. Refer to parameter 5.2.6 and 6.2.6 for CH Zones 2 and 3.

25.1.6

System CH Pump Activation Logic

0 = System CH pump runs for CH and DHW

demands 1 = System CH pump only runs during CH de-

0

mands

For applications configured as illustrated in Figures 1 and 2, where the System CH pump must be off during DHW demands, configure 25.1.6 = 1.

25.2.0

DHW Setpoint Temperature

97-140°F (Combi models) 104-140°F (Non-Combi models)

125

Establishes DHW temperature for the entire cascade system, including Combi boilers and Upstream IWH connected to individual boilers. Not applicable to Downstream IWH when Master parameter 25.2.2 = 2, or to Upstream IWH connected to Follower when parameter 3440.2.8 = 2, or Master when parameter 2.2.8 = 2 (and 25.2.2 = 0). Also settable by pressing the DHW +/- buttons from the home screen.

25.2.2

System DHW Mode (Applicable to Downstream IWH)

0 = CH Only

1 = Storage with Tank Sensor

0

2 = Storage with Aquastat

With 25.2.2 = 0, the Master boiler can be configured to heat an Upstream IWH connected only to the Master boiler. In this case, choose the DHW activation device (Tank Sensor or Aquastat) via parameter 2.2.8.

System DHW Charging Priority

0 = Alternating

1 = Timed Concurrent / Alternating

0

2 = Concurrent

25.2.6

0 = Alternating DHW and CH will not operate simultaneously. Priority switches between DHW and CH at an interval defined by the CH/DHW Shifting Priority Time (parameter 25.0.8); first priority is DHW. If 25.0.8 = 0, then DHW has priority indefinitely. 1 = Timed Concurrent / Alternating DHW and CH operate simultaneously for the period defined by the CH/DHW Shifting Priority Time (parameter 25.0.8). After the time elapses operation returns to Alternating until the end of the DHW request. 2 = Concurrent DHW and CH can operate simultaneously indefinitely.

Table 2 – Critical cascade parameters to be configured at the Master boiler. See E. Complete Cascade Technical Menu Parameters for a complete list of parameters.
Program the Cascade System (Followers): The following parameters must be configured at the each Follower boiler (0.4.6 = b-FL1 – 7). NOTE: Set parameter 0.4.6 prior to adjusting other settings using the Establishing Boilers as Master and Followers procedure. Each Follower must be set to a unique address, i.e., Follower #1 to b-FL1, Follower #2 to b-FL2, etc. NOTE: Menu level 34 is applicable to Follower #1 (0.4.6 = b-FL1); menu levels 35 to 40 are applicable to Followers #2 to 7 respectively. For clarity, the follow table omits menu levels 35 through 40.

Parameter

Description

Value

Default Setting

UNDEF = undefined,

b-SIN = single boiler,

b-MAS = master boiler,

b-FL1 = Follower #1 boiler,

0.4.6

Cascade Boiler Address (Follower boilers must be set to b-FL2 = Follower #2,

b-FL1, 2 – 7)

b-FL3 = Follower #3,

b-FL4 = Follower #4,

b-FL5 = Follower #5,

b-FL6 = Follower #6,

b-FL7 = Follower #7

b–SIN

34.0.1

DHW Preheating

0 = Disabled, 1 = Enabled

1

Enables / Disables DHW Comfort Function on Combi models (not applicable to non-Combi models) see par. 25.2.1. NOTE: When connected to a cascade system, DHW Comfort Function is automatically turned on.

34.2.8

Combi Models – DO NOT MODIFY

0 = Combi

0

Non-Combi Models Type of DHW control for Upstream IWH

1 = Storage with Tank Sensor 2 = Storage with Aquastat

2

Applicable when an Upstream IWH is connected directly to the individual Follower boiler. Not applicable for Combi models.

Emergency Setpoint

68-179°F

113°F

34.10.3

Sets Follower boiler operating temperature when communication with Master is lost. Can also be adjusted via the CH +/- buttons of the respective boiler, while operating in Emergency mode.

Table 3 – Critical cascade parameters to be configured at each Follower boiler. See E. Complete Cascade Technical Menu Parameters for a complete list of parameters.

6

WARNING
Install wiring and electrically ground boiler in accordance with the installation manual, the authority having jurisdiction or, in the absence of such an authority, follow the National Electrical Code, NFPA 70, and/ or CSA C22.1 Electrical Code-Part 1 in Canada. Failure to follow all applicable local, state, and national regulations, mandates, and building supply codes for guidelines to install the electrical power supply could result in property damage, serious personal injury, or death.
ELECTRICAL SHOCK HAZARD To ensure safety, turn off electrical power supply at service entrance panel before making any electrical connections to avoid possible electric shock hazard. Failure to do so could result in property damage, serious personal injury, or death.
Jumping out control circuits or components WILL VOID product warranty and can result in property damage, personal injury, or death.
It is of extreme importance that this unit be properly grounded. It is very important that the building system ground is inspected by a qualified electrician prior to making this connection. Electrical power must only be turned on when the boiler is completely filled with cold water. Failure to follow these instructions could result in component or product failure, serious injury, or death.
CAUTION
Label all wires prior to disconnecting when servicing the boiler. Wiring errors can cause improper and dangerous operation. Failure to follow these instructions may result in property damage or personal injury.
CAUTION
NOTE: Some newer thermostat models may draw too much power from the boiler and will require an additional power supply to operate properly. Review the instructions provided with the thermostat to determine if an additional power supply is needed. Failure to do so could result in improper boiler and/or thermostat operation.
DO NOT CONNECT 120V TO ANY CONTROL WIRING CONNECTION! DOING SO WILL RESULT IN IMPROPER OPERATION AND POSSIBLE DAMAGE TO THE BOILER. SUCH DAMAGES ARE NOT COVERED BY PRODUCT WARRANTY!
NOTE: Figures 1 and 2 are provided as further references for wiring cascade systems.
1. Connecting Power (120V) for DHW and CH Circulators NOTE: The CH and downstream IWH circulators MUST BE CONNECTED to the Master Boiler to ensure proper operation. To connect power for the CH and DHW external pump at the boiler junction box: 1. Shut off the power supply at the boiler and at the circuit breaker. 2. Shut off the gas at the manual shutoff. 3. Remove the boiler front cover. 4. Disconnect the three clips and open the junction box 5. Insert the circulator power cable through the hole in the side panel;
use an appropriate strain relief/conduit hub to secure the cable to the side panel. 6. Connect the cable on the connector CN5 (CH pump) and CN4 (DHW pump). See Electrical Wiring Diagram, Figure 4.

Part 1 – GeneralPSaarfte3t-yCIansfcoadrme Watiriionng

CN1 CH DHW
N PUMP PUMP

POWER-IN
DHW PUMP FUSE 5AT

L
CH PUMP FUSE 5AT

CN4

L

N

DHW PUMP

CN5

L

N

CH PUMP

CN6

Figure 4 – 120V Connections for DHW and CH Circulators
7. Verify that the new cable is correctly positioned inside the control panel.
8. Reconnect the cover of the junction box. 9. Reinstall the boiler front cover 10. Restore gas to the boiler. 11. Restore power to the boiler.
2. Low Voltage Wiring Connections To access the low voltage wiring connections: 1. Shut off the power supply at the boiler and at the circuit breaker. 2. Shut off the gas at the manual shutoff. 3. Remove the boiler front cover. 4. Remove the screw securing the control panel to the cross-member
(not applicable for TRX085, 120, 110C, and 150C models. 5. Push in the tabs and pull the control panel housing forward. 6. Disconnect the two clips. See Figure 5.

Figure 5 – Releasing the Two Clips
7. Open the control panel cover to have access to the main PCB. See Figure 6.

Figure 6 – Access to Low Voltage Wiring Connections
7

Part 1 – General Safety Information

Outdoor Sensor

Tank temp. probe

System Sensor

Cascade Connection

Room Thermostat

1

2

3

4

5

6

7

NOTICE
Take care to route the BUS communication cables and other low voltage wiring away from line voltage cables to avoid electrical interference which can cause operation issues or damage the main PCB.

CN1

120V 120V 120V 120V 120V 120V

TB

5V IN

BUS TT2 OD TNK SYS TT1

Figure 7 – Low Voltage Wiring Connections
3. Wiring a Cascade System NOTE: Disconnect the WiFi PCB on each Follower boiler prior to setting up the cascade system. Only the Master boiler should be connected to WiFi.
NOTE: Use the Establishing Boilers as Masters and Followers procedure, outlined in Part 2, when connecting boilers together on the BUS.

CAUTION
Ensure cascade wiring between boilers always runs from the BUS “T” connection to the next BUS “T” connection, and BUS “B” connection to the next BUS “B” connection. “T” to “T”; “B” to “B”.
Failure to follow these instructions will result in improper system operation, wasted time, money, and possible property damage and personal injury. Such damages ARE NOT covered by product warranty.

Master Boiler Low Voltage Wiring
BUS Network – Communication between cascaded boilers (up to 8) and/or NTI Room Sensors (up to 3) and/or one BUS NTI Multifunctional Kit. Maintain correct polarity of “B” and “T” terminals. Use a minimum of 20 AWG cable, preferably twisted pair, up to a maximum of 164 feet.
Room Thermostat 2 – Dry contact input for System CH Zone 2 demands. Parameters 5.1.0 through 5.7.5 are applicable to TT2 Zone 2 demands. NOTE: Zone 1 (TT1) demands take priority over Zone 2 (TT2) demands.
Outdoor Sensor – Connect to factory provided outdoor senOD sor to allow Automatic CH Temperature Control (or connect
Master boiler to WiFi and use Internet Weather).
Tank Sensor or Aquastat – Connect to a tank sensor or Aquastat installed in a Downstream IWH heated by the entire cascade system and set via 25.2.2. Or, installed in an Upstream IWH connected to the Master boiler and set via 2.2.8. TNK NOTE: The Master boiler cannot heat both a Downstream and an Upstream IWH. NOTE: If 25.2.2 = 1 or 2, the Master boiler considers the IWH to be Downstream and uses the entire cascade to service it regardless of the setting of parameter 2.2.8.
System Sensor Connect to a system sensor installed on the supply line of the secondary loop DO NOT INSTALL IN SYS PRIMARY LOOP. NOTICE: Failure to install a system sensor will cause the cascade system to operate in Emergency Mode.
Room Thermostat 1 Dry contact input for System CH Zone 1 demands. Parameters 4.1.0 through 4.7.5 are applicable to TT1 Zone 1 demands. NOTE: Zone 1 demands (TT1) take priority over Zone 2 (TT2) demands.

Follower Boiler Low Voltage Wiring

BUS Network – Communication between cascaded boilers (up to 8) and/or NTI Room Sensors (up to 3) or one NTI BUS Multifunctional Kit. Maintain correct polarity of “B” and “T” terminals. Use a minimum of 20 AWG cable, preferably twisted pair, up to a maximum of 164 feet.

Auxiliary Limit Switch Input Input does not function as a TT2 CH Zone 2 input, but functions as a limit switch input with
parameter 34-40.2.3 = 0.

OD

Not Applicable – Input does not function on Follower boilers.

Tank Sensor or Aquastat – Connect to a tank sensor or

TNK

Aquastat installed in an Upstream IWH connected to the respective Follower boiler. Set to Tank Sensor or Aquastat

via parameter 34-40.2.8.

SYS

Not Applicable – Input does not function on Follower boilers.

TT1

Not Applicable – Input does not function on Follower boilers.

8

Part 1 – GeneraPlaSrta4fe- CtyasIcnafdoerCmoantirolns

A. Master Boiler Homescreen Overview When viewing the Cascade Master Homescreen, the following screens will appear on the display and alternate every three (3) seconds.

This screen displays if the master boiler is turned off with the ON/OFF button.

Master Homescreen 1 – Overall System Details This screen signifies that this is a master boiler with two (2) followers: A three (3) boiler cascade system. The CASCADE text below further lets the user know that this is a cascade system. The system is currently meeting a CH Zone 1 demand. The bars to the left and right of the screen detail how close the DHW and CH temperatures are to the setpoint.

MAS Denotes Flame Detected Denotes a Three (3) Master Boiler with Power Level Boiler System

Figure 11 – Master Homescreen 3 – Boiler Off
NOTE: The screen will continue to rotate between the five (5) homescreens. The Supply Temperature screen will indicate “blOFF”.

Master Homescreen 4 – Cascade Master Operating Power Level This screen displays the current operating power level percentage of the cascade master. A power level of 50% is displayed below.

PL Denotes Boiler Current Cascade Master

Power Level

Power Level Percentage

Figure 8 – Master Homescreen 1 – Overall System Detail
Master Homescreen 2 – System Temperature This screen displays the current temperature read by the cascade System NTC Sensor. 138oF is displayed below.

SY Denotes System Sensor

Current Temp Read by System Sensor

Figure 12 – Master Homescreen 4 – Cascade Master Power Level

Master Homescreen 5 – Current Indirect Water Heater Tank Temperature / Aquastat Status (of Downstream/System IWH) This screen displays the current temperature read by a connected DHW NTC Tank Sensor. 120oF is displayed below.

TK Denotes

Current Temperature

DHW Tank Status Read by Sensor

Figure 9 – Master Homescreen 2 – System Temperature
Master Homescreen 3 – Boiler Supply Temperature This screen displays the current temperature read by the master boiler supply sensor. 150oF is displayed below.

bL Denotes Boiler Current Temp Read by

Supply Sensor

Boiler Supply Sensor

Figure 13 – Master Homescreen 5 – Current Temperature Read by DHW Sensor

This screen displays if an aquastat is connected. ON will appear if there is a DHW demand; OFF if there is no demand.

TK Denotes

Current Aquastat

DHW Tank Status Status

Figure 10 – Master Homescreen 3 – Boiler Supply Temperature

Figure 14 – Master Homescreen 5 – Current Status of the DHW Aquastat
9

Part 1 – General Safety Information

B. Follower Boiler Homescreen Overview When viewing the display on a specific follower boiler the following homescreens will appear and alternate every three (3) seconds.

Follower Homescreen 1 – Boiler Details This screen signifies that this is a follower boiler and its reference number is “2”.

b–FL Denotes Follower Boiler

2 Denotes Reference #

Follower Homescreen 3 – Boiler Operating Power Level This screen displays the current operating power level percentage of the follower boiler. A power level of 40% is displayed below.

PL Denotes

Current Power Level

Boiler Power Level Percentage

Figure 18 – Follower Homescreen 3 – Boiler Power Level

Figure 15 – Follower Homescreen 1 – Boiler Details

Follower Homescreen 2 – Boiler Supply Temperature
This screen displays the current temperature read by the follower boiler supply sensor. 140oF is displayed below.

bL Denotes Boiler Supply Sensor

Current Temp Read by Boiler Supply Sensor

Follower Homescreen 4 – Indirect Water Heater Tank Temperature / Aquastat Status (of Upstream /Local IWH) This screen is only displayed on the follower if it is connected to a DHW NTC Tank Sensor or Aquastat. This screen displays the current temperature read by a connected DHW NTC Tank Sensor. 120oF is displayed below.

TK Denotes

Current Temperature

DHW Tank Status Read by Sensor

Figure 16 – Follower Homescreen 2 – Boiler Supply Temperature
This screen displays if the follower boiler is turned off with the ON/OFF button.

Figure 19 – Follower Homescreen 4 – Current Temperature Read by DHW Sensor

This screen displays if an aquastat is connected. ON will appear if there is a DHW demand; OFF if there is no demand.

TK Denotes

Current Aquastat

DHW Tank Status Status

Figure 17 – Follower Homescreen 2 – Boiler Off NOTE: The screen will continue to rotate between the five (5) homescreens. The Supply Temperature screen will indicate “blOFF”.
Figure 20 – Follower Homescreen 4 – Current Status of the DHW Aquastat

10

Part 1 – General Safety Information

C. Technical Menu – Cascade Master Menu Structure The technical menu levels and parameter selection options for boilers configured as Master and Followers are different than those configured as standalone boilers. The differences are as follows:
Master Boiler Retains the technical menu levels available in a standalone boiler while adding menu level 25 for parameters specific to Cascade Management. NOTE: Some parameters normally accessed via menu levels 2 and 8 for a single boiler are now accessed via the Cascade Management menu see below:
· Automatic Temperature Control moves from 2.2.4 to 25.1.0 · Outdoor Temperature Reading Correction: from 2.4.9 to 25.1.1 · CH Boost Interval: from 2.4.4 to 25.1.2

· DHW Setpoint Temperature: from 2.0.0 to 25.2.0 · DHW Comfort Function: from 2.5.0 to 25.2.1 · Anti-legionella Function: from 2.5.7 to 25.2.3 · CH Supply Setpoint (diagnostic read only): from 8.3.0 to 25.3.0 · Outdoor Temperature (diagnostic read only): from 8.3.5 to
25.3.2
Follower Boiler Retains technical menu level 0 for setting the boiler address. Loses menu levels 4, 5, and 6 normally used for managing CH settings (Followers do not manage CH), and moves menu levels 2 and 8 to new menu level 34 (for Follower 1) [35-40 for Follower 2-7].
NOTE: The Master boiler also has access to the Follower menu of each Follower in the cascade system.

Quick Access Menus

0 NETWORK

25 Cascade Manager Parameters

4 User Interface

0 General

MENU Complete menu, with access to all parameters – see the following pages for details.

2 Boiler Parameters 0 General 1 Free Parameters 2 Settings

1 System Settings 2 Domestic Hot Water 3 System Diagnostics 4 Cascade Diagnostics

ERR – Fault The display shows the last 10 errors with the code, description, and date.

3 Central Heating-1 4 Central Heating-2 5 Domestic Hot Water

5 Error History 6 Reset Menu 34…40 Cascade Follower 1 – 7 Parameters

Press “+” (2) to scroll through errors

6 Boiler Manual Settings

0 General

7 Test & Utilities

1 Free Parameters

PCB Direct Access to the Parameters:

8 Reset Factory Settings 4 Zone1 Parameters

2 Settings 3 Central Heating-1

219, 220, 228, 229, 231 – 234, 247, 253, 257 (only when parameter 228 =1)

0 Setpoint 1 S/W Changeover 2 Z1 Settings

4 Central Heating-2 5 Domestic Hot Water 6 Boiler Manual Settings

DHW – Domestic Hot Water settings Direct Access to the Parameters: 228
CH1 – Heating Zone 1 settings Direct Access to the Parameters: 420, 422, 423, 425, 426, 475

3 Z1 Diagnostics 7 Z1 Regulation parameters 5 Zone2 Parameters 0 Setpoint 1 S/W Changeover 2 Z2 Settings 3 Z2 Diagnostics

7 Test & Utilities 8 Reset Factory Settings 9 Other-1 10 Other-2 11 Boiler Statistics-1 12 Boiler Statistics-2 13 Boiler

CH2- Heating Zone 2 settings Direct Access to the Parameters:

7 Z2 Regulation parameters 6 Zone3 Parameters

14 Boiler Temperature 15 Storage

520, 522, 523, 525, 526, 575

0 Setpoint

16 Service

CH3- Heating Zone 3 settings Direct Access to the Parameters:
620, 622, 623, 625, 626, 675

1 S/W Changeover 2 Z3 Settings 3 Z3 Diagnostics 7 Z3 Regulation parameters

17 Error History 18 Free Parameters 42 BMS Parameters 0 General

MODE – Boiler working MODE Press “+” (2) to select:

8 Service Parameters 0 Boiler Statistics -1

1 Analog Level Settings 2 Diagnostics

(Only DHW) (CH + DHW) –
(Only CH)

1 Boiler Statistics -2 2 Boiler 3 Boiler Temperature 4 Storage

BMS – Building Management System settings Only applicable with 0-10V / 4-20mA Clip-In Board installed

5 Service 6 Error History 7 Free parameters 8 Reset Factory Settings 9 Other – 1

10 Other – 2

11 NTI Zone Controller Parameters

0 General

1 Diagnostics

Figure 21 – Menu Structure

11

Part 1 – General Safety Information

D. Technical Menu – Cascade Follower Menu Structure

Quick Access Menus

0 NETWORK

4 User Interface

MENU Complete menu, with access to all parameters – see the following pages for details.

34…40 Cascade Follower 1 – 7 Parameters 0 General 1 Free Parameters 2 Settings

ERR – Fault The display shows the last 10 errors with the code, description, and date.
Press “+” (2) to scroll through errors

3 Central Heating-1 4 Central Heating-2 5 Domestic Hot Water 6 Boiler Manual Settings 7 Test & Utilities

PCB Direct Access to the Parameters:
34…40.19, 34…40.20, 34…40.28, 34…40.29, 34…40.31-34, 34…40.47, 34…40.53

8 Reset Factory Settings 9 Other-1 10 Other-2 11 Boiler Statistics-1 12 Boiler Statistics-2 13 Boiler

14 Boiler Temperature

15 Storage

16 Service

17 Error History

18 Free Parameters

19

20

28

29

31

32

33

34

47

53 Boiler Temperature

Figure 22 – Follower Menu Structure

12

E. Complete Cascade Technical Menu Parameters Description

Part 1 – General Safety Information
Value

Menu Sub-Menu Parameter
Default Setting

ACCESS the Complete Menu

1. Simultaneously press the “+” and “-” buttons for 5 seconds. The display shows 222.
2. Press the “+” button to select 234 , the service code. 3. Press the OK button. The display shows the first “quick setting” PCB.
4. Press the “+” button until the display shows MENU. 5. Press the OK button to access the complete menu.
Burning Hours Harmonization

2 7 7 Sets the burner run hours statistics to equal the average of the other boilers in the cascade. Used when replacing the PCB on the Master boiler. Perform this function ONLY on the boiler where the PCB has just been replaced.

CASCADE MANAGEMENT

25 0 GENERAL

Max CH Adjustable Power Percentage

0 – 100

100

25 0 0

Maximum Total Cascade CH Power

Max DHW Adjustable Power Percentage

0 – 100

100

25 0 1

Maximum Total Cascade DHW Power

25 0 2 Cascade Manager Turnover Logic

0 = Minimum Switches Off – On 1 = Maximum Power Division

0

Cascade Manager Turnover Hysteresis

0 – 20%

2

25 0 3

Sets the difference in power level between switching on and switching off the next boiler. See 25.0.4 and 25.0.5.

Cascade Manager Min Turnover Level

0 – par. 25.0.5 (%)

20

25 0 4 Sets the power level threshold where the next boiler is switched off. Switches off if required power is < 25.0.4 – 25.0.3. To avoid short-cycling, ensure 25.0.4 is set to less than half of 25.0.5 setting. Applicable only when parameter 25.0.2 = 0.

Cascade Manager Max Turnover Level

par. 25.0.4 – 100 (%)

70

25 0 5 Sets the power level threshold where the next boiler is switched on. Switches on if required power is > 25.0.5. Switches off if required power is < 25.0.5 – 25.0.3. Off logic only applicable if parameter 25.0.2 = 1.

CH On Differential Temperature

0 – 36oF

11

25 0 7

Determines how much the System temperature can drop below target before turning the cascade back on.

CH/DHW Shifting Priority Time

0 – 1440 minutes

45

25 0 8

NOTE: See 25.2.6 – System DHW Charging Priority

25 1 SYSTEM SETTINGS

Automatic Temperature Control

0 = OFF, 1 = ON

1

25 1 0

Normally managed via par. 2.2.4 for a standalone boiler.

Outdoor Temperature Reading Correction

-5 – +5oF

0

25 1 1

Normally managed via par. 2.4.9 for a standalone boiler.

CH Boost Interval

0 – 60 (minutes)

16

25 1 2 Sets the time delay between the automatic adjustments of the boiler target temperature in increments of +/- 7°F (normally managed via par 2.4.4 for a standalone boiler). Only applicable when the type of temperature control is set to Basic Temp. Control (Parameter 4.2.1 – 5.2.1 – 6.2.1 = 1)

Plant Frost Protection

0 = OFF, 1 = ON

0

25 1 3 CH system pump operates 10 minutes every 6 hours when outdoor temp = < 25oF; operates continuously when outdoor temp < 23oF.

25 1 5 System Pump Overrun

0 – 15 minutes or OC (On Continuously)

5

System Pump Activation Logic

0 – 1

25 1 6 0 = Always Active System pump runs for CH and DHW demands 1 = Only CH System pump only runs during CH demands

1 13

Part 1 – General Safety Information

Menu Sub-Menu Parameter
Default Setting

Description

Value

25 2 DOMESTIC HOT WATER – Applicable for Downstream / System IWH

DHW Setpoint Temperature Combi Models

97 – 140°F

125

DHW Setpoint Temperature Non-Combi Models

104 – 140°F

125

25 2 0 Establishes DHW temperature for the entire cascade system, including Combi boilers and Upstream IWH connected to individual boilers. Not applicable to Downstream IWH when Master parameter 25.2.2 = 2, or to Upstream IWH connected to Follower when parameter 34-40.2.8 = 2, or Master when parameter 2.2.8 = 2 (and 25.2.2 = 0). Also settable by pressing the DHW +/- buttons from the home screen.

DHW Comfort Function (only applicable to Combi Models) 2 = Always On

2

Comfort function keeps the DHW heat exchanger of a Combi boiler warm when a DHW demand is not active, thereby re25 2 1 ducing the amount of time needed to heat the hot water when a demand occurs. Function activates conditionally once per
Comfort Anti-Cycling Time, par 2.5.1 on the Master boiler, par. 34-40.5.1 on Follower boilers. To deactivate DHW Comfort Function of a Master boiler set par 2.0.1 = 0. To deactivate DHW Comfort Function at a Follower boiler set par 34-40.0.1 = 0.

25 2 2 System DHW Mode

0 = CH Only

1 = DHW Tank NTC

0

2 = DHW Tank Thermostat

25 2 3 Anti-Legionella Function

0 = Off 1 = On

0

System DHW Charging Priority

0 = Alternating

1 = Timed Concurrent / Alternating

0

2 = Concurrent

25 2 6 0 = Alternating DHW and CH will not operate simultaneously. Priority switches between DHW and CH at an interval defined by the CH/DHW Shifting Priority Time (parameter 25.0.8); first priority is DHW. If 25.0.8 = 0, then DHW has priority indefinitely.
1 = Timed Concurrent / Alternating DHW and CH operate simultaneously for the period defined by the CH/DHW Shifting
Priority Time (parameter 25.0.8). After the time elapses operation returns to Alternating until the end of the DHW request.
2 = Concurrent DHW and CH can operate simultaneously indefinitely.

DHW Modulation Setpoint

68 – 179oF

179

25 2 7

System target temperature during a DHW demand. Not applicable for Combi models.

DHW On Differential Temperature

0 – 36oF

0

25 2 8 Determines how much the DHW storage tank temperature can drop below target before initiating a DHW demand. Only applicable when 25.2.2 = 1.

25 3 SYSTEM DIAGNOSTICS – READ ONLY

25 3 0 System CH Supply Setpoint

Actual calculated System CH Target temperature

25 3 1 System Supply Temperature (in oF)

Actual temperature read by System sensor

25 3 2 Outdoor Temperature (in oF) 25 3 3 DHW Storage Temperature (in oF) 25 3 5 System Pump Status 25 3 6 DHW Pump Status 25 4 CASCADE DIAGNOSTICS – READ ONLY 25 4 0 Cascade Power Level (in %) 25 4 1 Total Number of Cascaded Boilers

Only with outdoor sensor connected Only with NTC tank sensor connected and 25.2.2 = 1 0 = OFF, 1 = ON 0 = OFF, 1 = ON

25 4 2 Available Cascaded Boilers

Does not count operating or locked out boilers

25 4 3 Active Cascaded Boilers

Boilers currently operating

14

Part 1 – General Safety Information

Menu Sub-Menu Parameter
Default Setting

Description

Value

25 4 4 Cascade Manager Status

1 = Stand-by, 2 = Meeting CH Demand, 5 = CH Temperature Reached, 8 = System Storage Loading, 9 = System Storage Loading Temp Reached, 20 = Pump Antifreeze, 21 = Burn Antifreeze, 27 = Plant Frost Protection with Burner Blocked, 28 = System Tank Frost Protection, 29 = System Antilegionella Function, 30 = Chimney, 31 = Air Purge, 51 = Lockout Volatile, 72 = External Control CH Serving, 74 = External Control DHW Serving, 75 = External Control CH Temp Reached, 77 = External Control DHW Temp Reached, 101 = Initialization

25 5 ERROR HISTORY – READ ONLY

25 5 0 Last 10 Errors

Displays the Last 10 Errors

25 5 1 Reset Error List

OK = Yes, ESC = No

25 6 RESET MENU

Automatically resets all parameters to the factory defaults.
WARNING: Always check PCB settings if restoring factory
default settings on a replacement controller. Replacement Reset: OK = yes, ESC = no 25 6 0 controllers have generic settings that may not be specific to
the boiler model.

Only applicable to parameters in menu levels 2 and 25 of the Master boiler.

34 – 40 FOLLOWER BOILER 1 – 7 34 – 40 0 GENERAL

DHW Preheating

0 = Disabled, 1 = Enabled

1

34 – 40 0 1

Enables/disables DHW Comfort Function on Combi models (not applicable to non- Combi models). See par 25.2.1.

34 – 40 1 FREE PARAMETER

DHW Flow Detection Device Type

0 = Flow Switch, 1 = Flow Meter

Varies

34 – 40 1 9 Default: 0 for TRX085, 120, 110C, 150C Default: 1 for TRX150, 199, 199C, FTVN085, 110, 150, 199, 110C, 150C, 199C

Combi models use a flow meter. Not applicable for non-Combi models.

34 – 40 2 SETTINGS

Ignition Power %

0 – 100

34 – 40 2 0

Must be set in accordance with parameter 2.2.0 – see boiler Installation Manual.

TT2 Input Configuration 34 – 40 2 3

0 = Auxiliary Limit Switch, 1 = Room thermostat zone 2

1

NOTE: TT2 cannot work as a room thermostat input on a follower boiler.

34 – 40 2 5 NOT USED

Combi Models CANNOT BE MODIFIED

0 = Combi

0

34 – 40 2 8 Non-Combi Models

0 = NOT USED

Type of DHW control for Indirect Hot Water Heater (Tank 1 = Storage with Tank Sensor

2

Sensor or Aquastat)

2 = Storage with Aquastat

Boiler Heating Capacity (MBH) 34 – 40 2 9
Only if the PCB is changed

0 – 200

34 – 40 3 CENTRAL HEATING – 1

34 – 40 3 1 NOT USED

34 – 40 3

Absolute Max DHW power percentage 2 CANNOT BE MODIFIED

0 – 100

Must be set in accordance with parameter 2.3.2 – see boiler Installation Manual.

34 – 40 3

Absolute Min boiler power percentage 3 CANNOT BE MODIFIED

0 – 100

Must be set in accordance with parameter 2.3.3 – see boiler Installation Manual.

15

Part 1 – General Safety Information

Menu Sub-Menu Parameter
Default Setting

Description

Value

34 – 40 3

Absolute Max CH percentage 4 CANNOT BE MODIFIED

0 – 100

Must be set in accordance with parameter 2.3.4 – see boiler Installation Manual.

34 – 40 3 5 NOT USED 34 – 40 3 6 NOT USED

34 – 40 3 7 Boiler Pump Post Circulation Time (After CH)

0 – 15 minutes or OC (On Continuously)

3

34 – 40 4 CENTRAL HEATING – 2

CH Fan Post-Purge

0 = 2 minutes, 1 = 5 minutes

1

34 – 40 4 3 Default: 0 for TRX085, 120, 150, 199, 110C, 150C, 199C Default: 1 for FTVN085, 110, 150, 199, 110C, 150C, 199C

34 – 40 4 7 Pressure Detection Device

1 = Pressure Switch

1

34 – 40

5

DOMESTIC HOT WATER (Applicable for Upstream / Local [Individual Boiler] IWH) NOTE: Parameters 34 – 40.10.1 and 34 – 40.10.2 are also for Upstream / Local (Individual Boiler) IWH Management

34 – 40 5 1 DHW Comfort Anti-cycling Time

0 – 120 (minutes)

60

DHW Start Delay 34 – 40 5 2
Anti “water hammering”

5 – 200 (0.5 to 20 seconds)

5

34 – 40 5 3 DHW Switch Off Logic

0 = anti-scale (stop at > 144°F) 1 = + 7 °F /setting

0

DHW Post Purge and Pump Cycle

0 = OFF, 1 = ON

1

OFF = 30 second post-circulation and 2 minute post-ventilation (or 3 minute post-circulation and 5 minute post-ventilation if

34 – 40 5

4

the boiler temperature requires it) ON = When setting is ON, time for post- circulation is 3 minutes, while the time for post-ventilation is 5 minutes.

Default: 0 for TRX085, 120, 150, 199, 110C, 150C, 199C Default: 1 for FTVN085, 110, 150, 199, 110C, 150C, 199C

CH Start Delay Following DHW

0 – 30 (minutes)

0

34 – 40 5 5

Setting is only applicable following a DHW demand from an Upstream IWH connected to the individual follower.

34 – 40 6 BOILER MANUAL SETTINGS

34 – 40 6 0 Manual mode activation

0 = OFF, 1 = ON

0

Boiler pump control

0 = OFF, 1 = ON

0

34 – 40 6 1

Set Parameter 260=1

Fan control

0 = OFF, 1 = ON

0

34 – 40 6 2

Set Parameter 260=1

3 way valve control 34 – 40 6 3
Set Parameter 260=1

0 = DHW, 1 = Heating

0

34 – 40 6 4 DHW Pump Control

0 = OFF, 1 = ON

0

34 – 40 7 TEST AND UTILITIES

34 – 40 7 34 – 40 7

Test Mode 0

TEST+ TEST+ TEST+

= Max Heating power = Max DHW power = Minimum power.

TEST Mode can also be activated by pressing the Reset button for 10 seconds. Test Mode deactivates after 30 minutes or by pressing Reset.

Air-purge cycle 1
See First Ignition section.

0 = OFF, 1 = ON

16

Part 1 – General Safety Information

Menu Sub-Menu Parameter
Default Setting

Description

Value

34 – 40 7 4 Floor drying cycle

0 = OFF

1 = Functional Heating

2 = Curing Heating 3 = Functional Heating + Curing Heating

0

4 = Curing Heating + Functional Heating

5 = Manual

34 – 40 7 34 – 40 7

5 Floor dry Supply setpoint temperature

77 – 140°F

131

Burning Hours Harmonization
7 Sets the burner run hours statistics to equal the average of the other boilers in the cascade. Used when replacing the PCB on a Follower boiler. Perform this function ONLY on the boiler where the PCB has just been replaced.

34 – 40 8 RESET MENU

34 – 40 8

Automatically resets all parameters to the factory defaults.
WARNING: Always check PCB settings if restoring factory
default settings on a replacement controller. Replacement Reset: OK = yes, ESC = no 0 controllers have generic settings that may not be specific to
the boiler model.

Only applicable to parameters in menu level 34-40 of respective Follower boiler.

34 – 40 10 OTHERS 2

34 – 40 10 0 NOT USED

DHW Modulation Setpoint

68 – 179oF

179

34 – 40 10 1

Boiler target temperature during a DHW demand. Not applicable for Combi models.

DHW On Differential Temperature

0 – 36oF

0

34 – 40 10 2 Determines how much the DHW storage tank temperature can drop below target before initiating a DHW demand. Only applicable when 2.2.8 = 1.

Emergency Setpoint

68 – 179oF

113

34 – 40 10 3 Sets Follower boiler operating temperature when communication with the Master is lost, or when the System Sensor is disconnected. See Cascade Instruction Manual.

34 – 40 10 4 NOT USED 34 – 40 10 5 NOT USED 34 – 40 10 6 NOT USED 34 – 40 50 BOILER STATISTICS – 1 – READ ONLY 34 – 40 50 0 3 way valve cycles No. (n x10) 34 – 40 50 1 Boiler Pump On Hours (h x10) 34 – 40 50 2 Boiler pump cycles No. (n x10) 34 – 40 50 3 Boiler Power On Time (h x10) 34 – 40 50 4 Fan On Hours (h x10) 34 – 40 50 5 Number of fan cycles (n x10) 34 – 40 50 6 CH number of flame detections (n x10) 34 – 40 50 7 DHW number of flame detections (n x10) 34 – 40 51 BOILER STATISTICS – 2 – READ ONLY 34 – 40 51 0 CH Burner On Hours (h x10) 34 – 40 51 1 DHW Burner On Hours (h x10) 34 – 40 51 2 Number Of Flame Faults (n x10) 34 – 40 51 3 Number Of Ignition Cycles (n x10) 34 – 40 51 4 Average CH Cycle Length (min) 34 – 40 51 6 Number of times the Priority Timer (2.10.4) has elapsed, switching priority from DHW to CH (or vice versa).

17

Part 1 – General Safety Information

Menu Sub-Menu Parameter
Default Setting

Description

Value

34 – 40 52 BOILER STATISTICS – 3 – READ ONLY 34 – 40 52 1 Fan Status 34 – 40 52 2 Fan Speed RPM 34 – 40 52 3 Boiler Pump Status 34 – 40 52 4 3 Way Valve Position
DHW Flow Rate (in US gpm) 34 – 40 52 5
Not applicable to Non-Combi models

0 = OFF, 1 = ON
0 = OFF, 1 or 2 = ON 0 = DHW, 1 = Central Heating

34 – 40 52 6 APS Status

0 = Open, 1 = Closed

34 – 40 52 8 Gas Power (kW)

34 – 40 53 BOILER TEMPERATURE – READ ONLY

34 – 40 53 1 CH Supply Temperature (in °F)

34 – 40 53 2 CH Return Temperature (in °F)

DHW Outlet Temperature (in °F) 34 – 40 53 3
Not applicable to Non-Combi models

34 – 40 53 4 Exhaust Flue Temperature (in °F)

34 – 40 54 STORAGE – READ ONLY

Displays current tank temperature (in °F) 34 – 40 54 0
Only with NTC tank sensor connected

34 – 40 55 BOILER

Months to next maintenance

0 – 60 (months)

12

34 – 40 55 0 If enabled (8.5.1 = 1), a notification is made on the display (and via the Tele-diagnostic Service, if applicable), warning that it is

time for maintenance

34 – 40 55 1 Enable Maintenance Warning

0 = OFF, 1 = ON

0

Maintenance Warning Reset 34 – 40 55 2
Resets Maintenance Advice and clears the Warning. 34 – 40 55 4 SW Version – Display Interface 34 – 40 55 5 SW Version – Main Controller

Reset? OK= Yes, Esc = No

34 – 40 55 7 Floor Drying Total Remaining Days

0 – 26 Days

34 – 40 56 ERROR HISTORY – READ ONLY

10 last errors

ERROR 0 – ERROR 9

34 – 40 56 0 This parameter displays the last 10 boiler errors, indicating the error code, day, month and year of occurence. When the parameter is accessed, the errors are listed from ERROR 0 to ERROR 9.

34 – 40 56 1 Error list reset – Clears Error History

Reset? OK = yes, ESC = no

34 – 40 57 FREE PARAMETERS – READ ONLY

34 – 40 57 2 NOT USED

34 – 40 57 4 Boiler flow switch

0= OFF, 1= ON

34 – 40 57 6 Safety flame sensor

0= OFF, 1= ON

34 – 40 57 8 Boiler power level (%)

0 – 100 (0 = minimum power, 100 = maximum power)

34 – 40 57 9 Boiler Flame Signal Measured by the Control Table 4 – Complete Parameters List

The flame signal must exceed 18 to initially detect the presence of flame. Flame loss is detected if the signal drops below 15.

18

Part 5 – TroublesPhaoorti1ng- General Safety Information
The Cascade Master can display all faults generated by the cascade system, whether the boiler is the Master or a Follower.

Display

Description

Possible Remedies

Error Type

1. Connect System Sensor to Master boiler SYS terminal – see Wiring a Cascade System.

115

System Sensor Open Short 2. Check cable between System Sensor and Master boiler.

Circuit

3. Ensure that the System Sensor is a 10k Ohm NTC.

4. Replace System Sensor. If problem persists replace the main control.

Warning (Auto Reset)

150 System Sensor Overheat

Press the Reset button to clear the Error Code.

If Error happens again:

1. Check for the correct functioning and positioning of the supply and return temperature probes of each Warning

boiler.

(Auto

2. Ensure that the System Sensor is a 10k Ohm NTC.

Reset)

3. Check for the correct functioning and positioning of the System Sensor – check sensor resistance vs

Sensor Temperature Resistance table in boiler Installation Manual. Replace System Sensor.

441

Follower Boiler BUS Connection

Missing

from

Press Reset to clear the Error Code. If Error happens again: Check the BUS wiring. Ensure it is intact and connected. Repair if necessary.

Warning (Manual Reset)

CONFL Configuration Conflict

Each boiler connected to the BUS must have a unique address (parameter 0.4.6). No boiler can be configured

as «b-SIN».

Blocking

1. Press OK. Choose and correct the boiler address. Press OK again.

(Auto

2. If above process does not work, access parameter 0.4.6 and set the correct boiler address – see Cascade Reset)

Control Set-Up.

NOAVL Boiler Address Unconfigured

Boiler address is undefined (0.4.6 = UNDEF). 1. Press OK. Choose and correct the boiler address. Press OK again. 2. If above process does not work, access parameter 0.4.6 and set the correct boiler address – see Cascade
Control Set-Up.

Blocking (Auto Reset)

EMERG Emergency Mode

1. The Follower has been disconnected from the BUS or no longer sees the Master on the BUS – check the

BUS connections. See Wiring a Cascade System.

2. The control has sensed a short circuit on the BUS connection. Disconnect the field wiring from the BUS

connection and confirm wiring. 3. Verify that the BUS polarity («B» and «T» connections) is consistent on all devices connected to the BUS.

Warning

4. If problem persists replace the main control.

NOTE: When in Emergency Mode the boiler operates in CH mode with a target boiler temperature =

Emergency Setpoint (2.10.3 for Master boiler, 34-40.10.3 for Follower boilers).

Table 5 – Boiler Error Codes
Important Contact a qualified service technician for assistance if a Lockout Error occurs frequently. For safety reasons, the boiler will permit a maximum of five (5) resets in 15 minutes (five [5] presses of the RESET button). A sixth (6th) attempt within this 15 minute period will lock out the boiler permanently. The boiler will only operate again after the electrical supply has been disconnected and reconnected. Repeated Lockout Error conditions could indicate a serious error with the boiler or installation. Failure to contact a qualified service technician to troubleshoot the error could result in substantial property damage, serious personal injury, or death. *Error is resettable remotely via NTI Tele-Diagnostic Service, NTI Remote Contractor.

19

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NTI Boilers Inc.
30 Stonegate Drive Saint John, NB E2H 0A4 Canada
Technical Assistance: 1-800-688-2575 Website: www.ntiboilers.com Fax: 1-506-432-1135
87098 Revision Date 10.7.20