2.7.7
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.
•
Roof terminal to have a minimum equivalent free area of 10,000mm
2
.
2.7.8
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
.
2.7.9
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.
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
(See Figure 18 for wiring diagram)
Controller
Switch Type
Speeds
ZGS2
2 - position rocker
Low (I) High (II)
Note: The unit may also be wired to a Building Management System (BMS)
(See Section 2.9.1 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.
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