&
The governor at the meter must give
a constant outlet pressure of 21
mbar +/- 1mbar. when the appliance
is running.
&
The gas supply line should be
purged.
Warning
: Before purging open all
doors and windows, also extinguish
any cigarettes, pipes and any other
naked lights.
&
The complete installation must be
tested for gas soundness.
Electricity Supply
&
Wiring external to the appliance
must be in accordance with BS
7671 (the current I.E.E Wiring Reg-
ulations) for electrical installation
and any local regulations which
apply.
&
The mains cable must be at least
0.75 mm
2
(24/0.2 mm) PVC insu-
lated to BS 6500 table 16.
&
Warning:
This Appliance must be
earthed. (Failure to provide a satis-
factory earth connection would be a
safety hazard and may also result in
appliance malfunction).
&
The method of connection to the
mains supply must facilitate com-
plete electrical isolation of the appli-
ance. Either a 3A fused three pin
plug and unswitched shuttered
socket outlet, both complying with
BS 1363, or a 3A fused double pole
switch having a 3 mm contact
separation in both poles and serving
only the boiler (and its external con-
trols) may be used.
External Controls
To ensure optimum performance,
Viessmann offer a range of external
controls however the appliance may
be used with any certificated room
thermostat or time clock room thermo-
stat.
Installation Requirements
(cont.)
28
Preparing for installation
58
62
670
GB
