Danfoss 353704 Air Ventilation Units Installation Guide

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Installation guide
Danfoss Air ventilation unitsdanfoss.com

SAFETY NOTES

This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
Children must be supervised to ensure they do not play with the appliance.
In addition to changing the air filter and cleaning the exterior of the system, any service will require trained personnel.

BEFORE YOU START

Please check that the delivery of the Danfoss Air unit is complete according to the delivery note.
If you have ordered a complete Danfoss Air solution, a complete delivery note for the Air Flex duct system is included.
Check parts and elements to make sure nothing is damaged.
Note! Danfoss Air Flex ducts are subject to applicable Danish legislation and reference is made to:

• Danish Standard DS 428: Standard for fire safety measures for ventilation systems.
• Danish Standard DS 447: Standard for mechanical ventilation systems.

INSTALLING AIR UNITS

Ceiling unit a² and a³

1. a. (a2 units) Bend out the tabs at a 90 degree angle and install the 4 nipples 1a  as shown in the image to the right.
2. b. ( a3 units) Pull the inlet rings out of the duct connections 1b. Turn the duct connections over and install them using the supplied sheet metal screws (for screwdrivers, use the lowest torque setting).
3. Make a platform for the unit out of 16 mm plywood/MDF around 50 mm masonry batts.
4. Make sure the unit is installed with a slight back drop towards the condensation spigot. See sketch.
5. Install ducts on nipples/inlet rings. Fix the flaps to the duct and nipple, e.g. with self-tapping ventilation screws.
6. A water trap n must always be fitted to the device (ordered separately).
7. Install the siphon on the rafter m under the unit.
8. Connect the siphon to a drain o.
9. The condensation line l must be insulated where there is a risk of frost.
10. Connect the hose to the condensation outlet nozzle on the unit. Route the connected hose to the drain and ensure a slope of at least 1 cm/meter.
11. Remove the front panel and foam front, fill the condensation tray, check the drain function and reassemble the front.

NB: Never lift the unit in the duct connections. Lifting the system by the duct connections can cause a leak between the steel casing and the polystyrene core. A leak can be repaired by caulking the duct connection from the inside with an acrylic-based sealant.

Weight w¹ and w²

1. Place the mounting bracket j in the desired location on the wall (75 mm from the bottom of the bracket to the top of the unit), mark and drill holes. Use screws suitable for the wall surface (screws not included).
2. Make sure the bracket is fully installed in level.
3. Hang the device on the bracket.
4. Install the self-adhesive rubber spacers k on the lower, rear back plate.
5. Allow 60 cm of free space in front of the unit to ensure access for servicing.
6. A water trap I must always be fitted to the device (ordered separately).
7. Mount the siphon on the wall under the unit.
8. Connect the water trap to the drain n at the bottom of the unit.
9. The condensation line m must be insulated where there is a risk of frost.
10. Connect the hose to the condensation outlet nozzle on the unit. Route the connected hose to the drain and ensure a slope of at least 1 cm/meter.
11. Remove the front panel and foam front, fill the condensation tray, check the drain function and reassemble the front.

ATTENTION: To comply with safety standards and avoid the risk of malfunction, the supplied protective shield must be mounted on top of the w¹ device to cover the connection plate.

Service area
It is recommended to keep areas around the ventilation system free for accessibility for service and maintenance. For a2 and a3 models, the a firm surface is established in front of the system with a ground clearance of 1.2 m. recommendations are not is observed, servicing may be deemed to be unsafe from a health and safety perspective.

INSTALLING THE DANTHERM CONTROL PANEL

NB! Connect the control panel before connecting the 230V power supply
4.1 Connecting 10 m cable
1. The wide connector on the cable connects to the ventilation unit

The small connector on the cable connects to the Dantherm control panel
If the included 10 m cable is not long enough for installation, a longer cable can easily be connected via the screw terminals in the connectors.
Plug on the cable:
Large plug: 1. Lice to (2) 2. Orange 3. Orange/white 4. Black 5. Blue 6. Blue/white
Small connector: 1. Orange 2. Orange/white 3. black 4. Blue 5. Blue/white
4.2 Connecting 230V
230V is connected to the system via the supplied power cable. The following happens on first startup:

1. Firmware update starts automatically and the LEDs in the panel will now light up alternately during the update, which takes about 3 minutes.
2. During the last part of the update, the control panel will light up in all 4 steps for about 5 seconds.
3. Then everything switches off for about 5 seconds, followed by auto mode (steps 1-3).
4. The update is now complete.
5. Restart the ventilation system by switching the 230V power supply off and on again.

BALANCING THE NOMINAL AIR VOLUME

To achieve the best possible performance, it is essential that the main air volumes are regulated (this will help protect the house from fungus and rot). The system should not be set at outdoor temperatures below -3°C, as it will go into frost protection mode (indicated by a flashing icon on the display). If adjustment is required at outdoor air temperatures below -3°C, remove the power supply for 20 seconds to deactivate the frost protection for 90 minutes.
Note! Close all exterior doors and turn off the hood.

1. Remove the front panel from the device by pulling the handles.
2. Refer to the duct system drawing for suggested preset values for all air vents. Close the valves completely and then turn them a full turn towards ‘open’ (number of turns as indicated on the ductwork drawing). When balancing the unit where Danfoss has not dimensioned the duct system, adjust the supply and extract valves according to the instructions of the designer.
3. If dampers are included in the system, open them fully.
4. It is the nominal air volume that needs to be regulated. The nominal airflow is fan stage 3 in manual mode on the control panel. Install measuring hoses between the device’s measuring points on the exhaust side and the differential pressure gauge.
5. Find the required flow rate on the system diagram (sticker on the front) with the corresponding differential pressure value. If the pressure is too low, adjust the fan stage up until the desired pressure is reached.
6. The main airflow is adjusted by adjusting the potentiometer for the supply fan until the desired pressure difference is achieved. The potentiometer is located on the back of the control panel.
7. After adjusting the potentiometers, allow approximately 2 minutes for the unit to become stable again.
8. Move the measuring hoses to the measuring points on the supply air side and use the same procedure to adjust the supply air.
9. Once the main air volumes have been adjusted, an adjustment must be made to the individual valves. In most cases, this will result in minor changes to the selected base levels, but this can be done in the room by adjusting the valves or by using the Air Dial to fine-tune the base levels.

The potentiometers for balancing are located on the back of the control panel

TECHNICAL SPECIFICATIONS

6.1 a²device
Dimensions

1. Outdoor air
2. Discharge air
3. Extract air
4. Supply air
   Unit weight: 52 kg

Front view (without front panel)

1. Filter, room extract air
2. Filter, supply air
3. Flow diagram (for commissioning)
4. Reset button for filter
5. Differential pressure outlet for room extraction
6. Differential pressure outlet for room supply air

Capacity
External pressure [Pa]

Efficiency
η [%]

• 0.45 W/m³/h = “Passive House” requirement

Air volume [m³/h]| Pext. [Pa]| SEL [J/m³]| P1 **to. [W]**
---|---|---|---
160| 50| 615| 27
220| 70| 728| 44
220| 100| 854| 52
260| 70| 783| 57
260| 100| 894| 65
300| 90| 936| 78

Tab. 3: Capacity of a²device

| Extraction from rooms| Outdoor air|
---|---|---|---
| t = 21 °C   RH = 36%| t = -3 °C  RH = 80%| with condensation and 5% imbalance
| t = 20 °C   RH = 38%| t = 7 °C| according to EN13141-7 (dry)

Tab. 4: Air conditioner efficiency ratings for a²unit

Airflow m3/h| Pres sure
[Pa]| Measured by:| Frequency band [Hz], sound power Lw (A) [dB(A)]| Sound pressure
**Lp(A) (standard*
room) [dB(A)
---|---|---|---|---
63| 125| 250| 500| 1000| 2000| 4000| 8000**
162| 70| Air intake duct| 23| 34| 40| 36| 29| 25| 17| 18|
Extraction duct| 23| 33| 39| 37| 29| 24| 18| 18|
Cabinet| 40
162| 100| Air intake duct| 25| 35| 43| 38| 31| 28| 18| 18|
Extraction duct| 25| 36| 42| 39| 30| 25| 17| 18|
Cabinet| 41
216| 70| Air intake duct| 26| 36| 44| 39| 33| 30| 19| 18|
Extraction duct| 28| 36| 43| 41| 34| 29| 18| 18|
Cabinet|
216| 100| Air intake duct| 26| 37| 44| 40| 34| 31| 19| 18| 45
Extraction duct| 27| 37| 45| 42| 35| 30| 19| 18|
Cabinet|
250| 100| Air supply duct| 28| 39| 46| 42| 37| 33| 21| 18| 46
Air intake duct| 30| 39| 48| 45| 38| 33| 20| 18|
Cabinet| 49

• Sound pressure values calculated for a standard room with A = 10 m², H = 2.4 m and average attenuation 0.2.

Tab. 5: Audio data for a²device

6.2 a³device
Dimensions

1. Outdoor air
2. Discharge air
3. Extract air
4. Supply air
   Unit weight: 67 kg

Front view (without front panel)

1. Filter, room extract air
2. Filter, supply air
3. Flow diagram (for commissioning)
4. Reset button for filter
5. Differential pressure outlet for room extraction
6. Differential pressure outlet for room supply air

Capacity
External pressure [Pa]

Efficiency
η [%]

• 0.45 W/m³/h = “Passive House” requirement

Air volume [m³/h]| Pext. [Pa]| SEL [J/m³]| P1 **to. [W]**
---|---|---|---
200| 70| 787| 44
350| 70| 835| 81
450| 70| 973| 122
350| 100| 1000| 97

Tab. 6: Capacity of a³ device

| Extraction from rooms| Outdoor air|
---|---|---|---
| t = 21 °C  RH = 36%| t = -3 °C   RH = 80%| with condensation and 5% imbalance
| t = 20 °C   RH = 38%| t = 7 °C| according to EN131417-7 (dry)

Tab. 7: Air conditioner efficiency ratings for a³unit

Luft- mæng de m³/h| Tryk [Pa]| Målt ved:| Frekvensbånd [Hz], lydeffekt Lw (A) [dB(A)]| *Lydtryk Lp(A) (standard rum) [dB(A)]
---|---|---|---|---
63| 125| 250| 500| 1000| 2000| 4000| 8000**
350| 70| Indblæsning- skanal| 35| 45| 56| 49| 47| 44| 31| 16|
Udsugning- skanal| 35| 44| 54| 48| 48| 44| 31| 19|
Kabinet| 57
450| 100| Indblæsning- skanal| 39| 48| 62| 55| 52| 50| 37| 22|
Udsugning- skanal| 39| 47| 61| 55| 53| 48| 37| 20|
Kabinet| 61

• Værdier for lydtryk beregnet for et standardrum med A = 10 m², H = 2,4 m og gennemsnitlig dæmpning 0,2.

Tab. 8: Lyddata for a³-enhed

6.3 w¹ device

1. Supply air
2. Extract air
3. Discharge air
4. Outdoor air
5. Condensation drain| 6. Filter, room extraction
7. Filter, supply air
8. Differential pressure outlet for room extraction
9. Differential pressure outlet for room supply air
10. Reset button for filter
---|---

Device weight: 31 kg

Capacity
External pressure [Pa]

Efficiency
η [%]

• 0.45 W/m³/h = “Passive House” requirement

Air volume [m³/h]| Pext. [Pa]| SEL [J/m³]| P1 **to. [W]**
---|---|---|---
100| 35| 588| 16
100| 55| 682| 19
140| 60| 710| 28
140| 70| 759| 30
180| 70| 798| 40
180| 100| 945| 47

Tab. 9: Capacity of w¹ device

| Extraction from rooms| Outdoor air|
---|---|---|---
| t = 21 °C   RH = 36%| t = 5 °C  RH = 80%| with condensation and 5% imbalance
| t = 20 °C   RH = 38%| t = 7 °C| according to EN13141-7 (dry)

Tab. 10: Air conditioner efficiency ratings for the w¹ unit

Airflow m³/h| Press and print [Pa]| Measured by:| Frequency band [Hz], sound power Lw (A) [dB(A)]| Sound pressure *Lp(A) (standard room) [dB (A)
---|---|---|---|---
63| 125| 250| 500| 1000| 2000| 4000| 8000**
126| 70| Air intake duct| 20| 30| 41| 42| 38| 30| 19| 18|
Extraction duct| 18| 30| 41| 41| 30| 26| 18| 18|
Cabinet| 47
126| 100| Air intake duct| 22| 32| 46| 45| 39| 32| 21| 18|
Extraction duct| 22| 33| 43| 42| 32| 27| 19| 18|
Cabinet| 50
162| 70| Air intake duct| 23| 31| 43| 46| 41| 33| 22| 18|
Extraction duct| 26| 31| 42| 43| 33| 29| 21| 18|
Cabinet| 53
162| 100| Air intake duct| 28| 33| 44| 48| 43| 35| 23| 18|
Extraction duct| 29| 34| 44| 51| 37| 31| 23| 18|
Cabinet| 55
216| 70| Air intake duct| 28| 33| 44| 54| 46| 37| 28| 18|
Extraction duct| 27| 33| 43| 52| 39| 33| 27| 18|
Cabinet| 57
216| 100| Air intake duct| 28| 35| 45| 55| 46| 38| 29| 18|
Extraction duct| 32| 34| 44| 52| 40| 34| 28| 18|
Cabinet| 56

• Sound pressure values calculated for a standard room with A = 10 m², H = 2.4 m and average attenuation 0.2.

Tab. 11: Sound data for the w¹ device

6.4 w² device

1. Supply air
2. Extract air
3. Discharge air
4. Outdoor air
5. Condensation drain| 6. Filter, room extraction
7. Filter, supply air
8. Differential pressure outlet for room extraction
9. Differential pressure outlet for room supply air
10. Reset button for filter
---|---

Device weight: 45 kg

Capacity
External pressure [Pa]

Efficiency
η [%]

• 0.45 W/m³/h = “Passive House” requirement

Air volume [m³/h]| Pext. [Pa]| SEL [J/m³]| P1 **to. [W]**
---|---|---|---
160| 50| 700| 31
220| 70| 832| 51
220| 100| 963| 59
260| 70| 892| 64
260| 100| 996| 72
280| 90| 1000| 78

Tab. 12: Capacity of w²device

| Extraction from rooms| Outdoor air|
---|---|---|---
| t = 21 °C  RH = 36%| t = -3 °C  RH = 80%| with condensation and 5% imbalance
| t = 20 °C  RH = 38%| t = 7 °C| according to EN13141-7 (dry)

Tab. 13: Air conditioner efficiency ratings for the w²unit

Air vo- lume m³/h| Press and print [Pa]| Measured by:| Frequency band [Hz], sound power Lw (A) [dB(A)]| Sound pressure *Lp(A) (standard room) [dB (A)
---|---|---|---|---
63| 125| 250| 500| 1000| 2000| 4000| 8000**
126| 50| Air intake duct| 20| 30| 34| 36| 23| 19| 17| 18|
Extraction duct| 16| 31| 37| 36| 29| 21| 17| 18|
Cabinet| 39
162| 70| Air intake duct| 23| 33| 35| 40| 32| 24| 18| 18|
Extraction duct| 20| 33| 44| 39| 34| 26| 18| 18|
Cabinet| 44
162| 100| Air intake duct| 25| 36| 42| 42| 34| 28| 18| 18|
Extraction duct| 21| 33| 43| 41| 35| 28| 18| 18|
Cabinet| 46
216| 70| Air intake duct| 25| 34| 42| 42| 35| 28| 19| 18|
Extraction duct| 22| 34| 44| 43| 37| 31| 20| 18|
Cabinet| 47
216| 100| Air intake duct| 26| 36| 43| 44| 36| 30| 20| 18|
Extraction duct| 23| 34| 45| 44| 33| 32| 20| 18|
Cabinet| 49
250| 100| Air intake duct| 27| 36| 45| 45| 38| 31| 21| 18|
Extraction duct| 24| 37| 47| 45| 40| 34| 22| 18|
Cabinet| 53

• Sound pressure values calculated for a standard room with A = 10 m², H = 2.4 m and average attenuation 0.2.

Tab. 14: Audio data for w²device

FACTORY SETTING

7.1 Frost protection
How frost protection works

1. Frost protection for heat exchangers
   The controller has a built-in protection function against icing of the heat exchanger. If the return air temperature is below +2 °Cfor more than 1 1/2 hours, the unit will start reducing the fresh air volume (supply fan speed is reduced) until the return air temperature is at least +2 °Cagain. Frost protection will typically start when the fresh air (T1) is -6 to – 7 °Cor below.

2. Stop
   Operation stop at outdoor temperatures below -13 °C. If the outside air (T1) is below -13°Cfor more than 5 minutes, the unit will stop completely for 30 minutes.
   Then the unit starts up again for 5 minutes. If the temperature does not rise above -13°C, the unit will stop again for 30 minutes and so on.

Recommendation
To ensure balanced ventilation without intentional downtime, we recommend installing a preheating coil in areas where the outdoor temperature can be below -6 °Cfor long periods of the year. In other areas where the outside temperature is below -13 °C,  preheating is a prerequisite for optimal operation.

ERROR MESSAGE

Yellow LED (30 /min.) and beep sound.
The unit continues to run, but with ad- ditional power consumption and possible noise nuisance due to increased pressure loss in the dirty filter.| Filters are in need of replacement| Change the filters and reset the filter timer on the unit.
Red flashing LED (30/min.) and beep sound.
The unit continues to run in fail-safe mode, with the supply air fan constantly run- ning at the lowest speed (stage 1) and the extract air fan constantly running at stage 1 or 2.| One of the following components is faulty or has a poor connection:
• T3 extraction sensor
• T4 return sensor Or
One of the two fans is not reaching the desired speed.| Inspect and replace the sensor kit if neces- sary.
Check if the fans run smoothly and if the wires have lost their connection.
The unit is not running and there is no light in the control panel| The power is disconnected.| Check that the power cable is fitted cor- rectly.
There is water around/under the unit| A water trap has not been installed on the drain as prescribed.| Check and install the water trap as pre- scribed.
| The drain nozzle on the aggrega or the drain hose is frozen.| Install frost protection from the drain spout of the unit all the way to the drain, possibly using a heating cable (accessory).
| The drain is blocked in the hose or in the drip tray inside the unit.| Check that the drain is not blocked and clean with water and washing-up liquid if necessary.
The unit makes abnormal noise| Fan stage 4 is running (only intended to run for a short period of time)| Turn the unit down to level 1, 2, 3 or acti- vate automatic demand control.
| The filter is blocked.| Check and change the filter if necessary
| The airway may be partially blocked| Check that air inlets and ducts are not blocked by external elements.
| The unit is not regulated correctly.| Make sure the unit is properly registered.

Danfoss A/S
Climate Solutions • danfoss.com • +45 7488 2222
Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to form, fit or function of the product.
All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

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© Danfoss | HydronicS | Sub-systems | 2023.10

References

• Engineering Tomorrow | Danfoss

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