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1.0 General Description / Physical Specification
1.1 Overview
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. Heat 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 Section 2.8.5 Electrical).
1.1.3 This product features on the PCDB as a high efficiency version and part of the process requires the Installation
Checklist for MVHR 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 WM
• 125mm Ducting (rectangular ducting can be used, where appropriate)
• ZGS2 Hardwired switch providing switching between low and high (option)
• ZGRC1 Hardwired boost and system status controller, switching between low and high (option)
• ZGS1 Hardwired switch providing switching between low, AUX and high (option)
1.1.5
Packaging includes:-
1 x Heat 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.
