9
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 10,000mm
2
.
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 ~ 50Hz 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 Management System (BMS)
(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) High (II)
ZGRC1 Single push button Low (I) High (II)
ZGS1 3 - position rocker Low (centre), AUX (I), High (II)
ZGRC1
