Zehnder Rittling ComfoAir 155 WM User manual

ComfoA r 155 WM
Mechanical Ventilation with eat Recovery
Installat on Instruct ons
CA155WM-GB

2
Page
1.0 General Descr pt on / Phys cal Spec f cat on ........................... 3 - 4
2.0 Installat on Instruct ons .............................................................. 4
General Preparation ...................................................................... 4
Configuration ................................................................................. 5
Mounting ....................................................................................... 6
Access for Maintenance ............................................................... 7
Condensate Drain ......................................................................... 7
Ducting Guidelines ....................................................................... 8
Electrical ....................................................................................... 9
Wiring the Unit .............................................................................. 10
Connecting to the BMS ................................................................. 11
3.0 On-S te Comm ss on ng ............................................................. 14
4.0 Guarantee ..................................................................................... 20
Contents

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1.0 General Descr pt on / Phys cal Spec f cat on
1.1 Overv ew
1.1.1 The ComfoAir 155 WM is a ventilation system designed to provide improved indoor air quality in dwellings.
As a whole house system, the unit continuously extracts air from the non-habitable rooms and supplies fresh,
filtered air to habitable rooms. eat that is recovered from the air drawn from the bathrooms and kitchen is
passed through a heat exchanger and the heat that is recovered is transferred, to temper the supply air in
habitable rooms to provide a comfortable indoor environment.
1.1.2 A boost speed facility is provided to increase the ventilation rate, e.g. when cooking or showering, providing a
comfortable indoor environment. A two speed operation can be done via the Switch-Live (SL), a ZGS2 SL boost
switch or a ZGRC1 boost and alert controller can be used to provide this operation. A three speed operation can
be done via the ZGS1, or combining the Switch-Live with a ZGS2 SL switch for the AUX speed.
(See Sec ion 2.8.5 Elec rical).
1.1.3 This product features on the PCDB as a high efficiency version and part of the process requires the Installation
Checklist for MV R products to be completed and submitted to building control, available at
www.ncm-pcdb.org.uk along with all other relevant paperwork.
1.1.4 Ancillary Items Required
ComfoAir 155 W
• 125mm Ducting (rectangular ducting can be used, where appropriate)
• ZGS2 ardwired switch providing switching between low and high (option)
• ZGRC1 ardwired boost and system status controller, switching between low and high (option)
• ZGS1 ardwired switch providing switching between low, AUX and high (option)
1.1.5 Packaging includes:-
1 x eat Recovery Unit
1 x Wall Fixing Bracket (ComfoAir 155 WM)
Quick User / Quick Installer Guide
1.1.6 Warning: This appliance can be used by children aged from 8 years and above and persons
with reduced physical, sensory or mental capabilities or lack of experience and knowledge if
they have been given supervision or instruction concerning use of the appliance in a safe
way and understand the hazards involved. Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by children without supervision.
1.1.7 Where an open-flued oil or gas-fuelled appliance is installed, precautions must be taken to
avoid a back-flow of gases into the room.
1.1.8 The design, material specification and installation must only be carried out by "competent
persons". Electrical installation must be carried out by a qualified Electrician.
1.1.9 'If the supply cord is damaged, it must be replaced by a special cord / assembly available
from the manufacturer or its service agent. The replacement must be carried out by a
qualified electrician in accordance with IEEE or local regulations'.
1.1.10 Observe appropriate safety precautions if working on steps or ladders. Wear eye protection
when breaking out walls or window materials.
1.1.11 To disassemble the unit, disconnect from mains supply and use a screwdriver to segregate
the electronic components and motors from the plastic housing. Dispose items in
accordance with WEEE.

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1.1.12 WEEE Statement
This product may not be treated as household waste. Instead it should be handed to
an appropriate collection point for the recycling of electrical and electronic equipment.
For more detailed information about the recycling of this product, please
contact your local council office or your household waste disposal service.
1.2 Physical Specifications
ComfoAir 155 W
2.0 Installation Instructions
2.1 General Preparation
2.1.1 The ComfoAir 155 WM unit is supplied with 4 x 125mm Ø spigots.
• 125mm ducting with connectors can be used (see Ancillary Section page 3) to provide performance levels
required for compliance with local Building Regulations.
2.1.2 Installation of the unit should be in accordance with the current editions of Building Regulations, N BC
Compliance Guide and BS7671: IEE Wiring Regulations.
2.1.3 The design, material specification and installation must only be carried out by "competent persons". Electrical
installation must be carried out by a qualified Electrician.
2.1.4 I PORTANT NOTE: Gases from fuel-burning equipment must not be
drawn into any living areas. If any room, where air is extracted, contains
a fuel-burning appliance such as a central heating boiler, then either of
the following should be undertaken:
• The flue must be of the room sealed or balanced flue type or;
• Allowance must be made for an adequate supply of air into the room.
546
125
50
594
298
644
Front View Side View

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2.2 Pos t on ng
2.2.1 The ComfoAir 155 WM unit must be installed vertically and can be either wall or floor mounted to enable
effective condensate drainage in either a kitchen/service cupboard or secured to a vertical structure in the loft
space. If located within a cold space, it is recommended that the bottom of the unit is insulated to prevent
freezing around the condensate connection. Duct spigots must be upright at top of unit.
2.2.2 It is not advisable to install the unit directly above a bedroom or living room ceiling, or in an area that is part of a
living area or bedroom.
2.2.3 Consideration must be given to allow for adequate access for servicing, maintenance and any fault diagnostics
(See Sec ion 2.5 Access for Main enance).
2.2.4 The unit can be configured for right and left hand installation at a touch of a button by following the steps within
the Commissioning Wizard (See Sec ion 3.1.4 Commissioning Wizard) and does not require any internal
changes. (See Figures overleaf for duc ing configura ion).
2.3 Conf gurat on
Note: To change the handing of the unit, follow the simple steps within the Commissioning Wizard (See Sec ion
3.0). Automatically done for you via software.
ComfoA r 155 WM
Left Hand
EXTRACT
SUPPLY
EXHAUST
INTAKE
Right Hand (factory setting)
INTAKE
EXHAUST
SUPPLY
EXTRACT

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2.4 Mount ng
2.4.1 The ComfoAir 155 WM unit is supplied with one wall fixing bracket. The bracket is a long strip and has two
adjustable fixing points located at the end of the bracket. Screws and fixings not supplied.
2.4.2 Proceed to align the wall bracket taking into account the available wall space to mount the unit, ensuring that the
wall can support 20kg.
2.4.3 Use a spirit level to assist mounting and levelling the bracket. Securely fix bracket to wall using suitable fixings.
2.4.4 The unit fixes to the wall bracket by slotting the bracket attached to the back of the unit and hooking into place.
Note:
• Fixing Bracket height will be critical in kitchen
cupboard.
• There should be no movement once correctly
located and the filters should be accessible by
easily removing the panels on the front of the unit.
(See Section 4.1.8 within the User / Homeowner Guide).
Fixing Bracket

7
2.5 Access for Ma ntenance
Footprint of ComfoAir 155 W
2.6 Condensate Dra n
2.6.1 It is important that any condensate MUST be drained away.
• The ComfoAir 155 WM unit is provided with a condensate drain located at the base of the unit
underneath (See Figures 1-3).
The drain plug allows a condensate drain hose (21.5mm diameter) to be push connected and solvent
welded/sealed. Please ensure a water tight seal is achieved.
2.6.2 The drain must have a 5º fall and can either be chased into the wall or run downwards from the unit into the
nearest waste water network. Ensure that steps are taken to minimise the risk of mechanical damage to the
drainage pipe work.
I PORTANT NOTE: The condensate drain must incorporate a waterless
trap or U bend to create an air block and avoid leakage of smells back
into the unit. If the unit is installed within a loft space, please ensure
that the condensate drain is insulated to prevent against freezing.
2.6.3 In some instances, a condensate connecting point will already be provided as part of the building design.
The position of this point, relative to where the unit is to be installed should be checked for any connection
misalignment and any necessary adjustment made before proceeding any further.
500mm
Side ViewTopView
500 mm
250 mm

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ComfoA r 155 WM
2.7 Duct ng Gu del nes
2.7.1 Please refer to design drawings for proposed ducting layout.
2.7.2 Four spigots are provided for connection of the ducting;
• ComfoAir 155 WM - 125mm nominal diameter
Ductwork should be securely connected to spigots. Failure to do this will cause unnecessary air leakage and
impair performance. Ducting must be connected to all four spigots according to right or left hand configuration
(See Section 2.3 for Configuration). It is recommended that a minimum distance of 200mm is maintained
between the ComfoAir 155 WM and any ducting bends.
2.7.3 To prevent condensation, ensure that the intake and exhaust ductwork from the unit is insulated.
2.7.4 Where ducts are exposed in unheated areas, such as roof spaces, they must be insulated with at least 25mm of
insulation.
2.7.5 If applicable, Fire Dampers UST BE FITTED in accordance with Part B of the Building Regulations.
2.7.6 Rigid Ducting
• Install using the fewest number of fittings to minimise resistance to air flow.
• Where possible, final connection to grilles and unit should be made with a flexible connection.
• Mechanically fix ducts using metal jubilee clips and appropriate non-hardening sealant for air tightness.
WARNING: Do not use screws for connection and ensure jubilee clips
are not over tightened.
2.7.7 Flexible Ducting
• Ensure ducting lengths are kept to a minimum and ducting is pulled taut so that it is smooth and straight.
A maximum of 300mm should be used on each spigot.
• Mechanically fix ducts using metal jubilee clips and tape seal for air tightness.
W ARNING: Should be in accordance with local Building Regulations.
Figure 1 - Close up view
of condensate
Figure 2 - Front View Figure 3 - Side View
Min 5º fall

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2.7.8 The intake fresh air should be directly from the outside.
• If drawn through a wall, an external grille should be fitted.
• If drawn through a roof, a recognised roof terminal should be fitted.
• Ensure that the free area opening of the grille/terminal is a minimum of 90% of the free area of the ducting
being used.
2.7.9 The exhaust air must exit to the outside through a wall or roof and must be protected by a wall grille or
recognised roof terminal.
• Roof terminal to have a minimum equivalent free area of 10,000mm2.
2.7.10 Intake and exhaust pipes should be installed at least 1m apart to avoid the cross contamination of airflows.
2.8 Electrical
2.8.1 WARNING: The appliance MUST be earthed.
All wiring must conform to IEE or local Wiring Regulations (minimum allowance on switch-live is 12V).
2.8.2 The installation must be carried out by a qualified Electrician.
2.8.3 All units are suitable for a 230V ~ 50 z single phase supply fused at 3A.
2.8.4 A triple-pole switch having a minimum contact separation of 3.0mm must be used to provide isolation for
the unit.
2.8.5 The recommended switches for use with this product are the Zehnder;
ZGS2 - Optional 2-position hardwired switch
ZGRC1 - Optional boost + system status hardwired remote switch
ZGS1 - Optional 3-position hardwired switch
(See Section 2.9 for wiring diagrams)
Note: The unit may also be wired to a Building anagement System (B S)
(See Section 2.9.5 for wiring details).
2.8.6 The controllers must not be mounted in a bathroom or above/closer than 1 metre to a cooker where it could be
affected by excessive heat or moisture.
2.8.7 The ComfoAir unit is supplied with a pre-wired mains flexible cord - PVC sheathed, 5-core green/yellow, grey,
brown, black & blue. Size 0.75mm.
2.8.8 'If the supply cord is damaged, it must be replaced by a special cord/assembly available from the
manufacturer or its service agent. The replacement must be carried out by a qualified Electrician in
accordance with IEE or local regulations'.
ZGS2 ZGS1
Controller Switch Type Speeds
ZGS2 2 - position rocker Low (I) igh (II)
ZGRC1 Single push button Low (I) igh (II)
ZGS1 3 - position rocker Low (centre), AUX (I), igh (II)
ZGRC1

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2.9 Wiring Diagrams Key: Earth = Green / Yellow
Neutral = Blue
Brown = Permanent Live
Black = AUX speed
Grey = igh speed
2.9.1 Two speed control via a light switch
2.9.2 Two speed control via ZGS2 switch
2.9.3 Three speed control via ZGS1 switch
2.9.4 Three speed control via a light switch for trickle & boost speeds and an AUX speed activation via a ZGS2 switch
Flying lead from CA155
Flying lead from CA155
Flying lead from CA155Flying lead from CA155