Viessmann VITODENS 100-W Installation And Service Instructions Manual page 28

Preparing for installation
Preparing for installation
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
2
0.75 mm (24/0.2 mm) PVC insu-
lated to BS 6500 table 16.
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.
28
(cont.)
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.