Electricity Supply; External Controls - Viessmann VITODENS 200 WB2A Installation & Servicing Instructions Manual

3 Installation Requirements
3.7 Gas Supply
e)
The governor at the meter must give a constant outlet pressure of 20 mbar
(8 in.wg) when the appliance is running. Alternatively for LPG appliances the
supply pressure should maintain 37 mb (14in wg)
f)
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.
g)
The complete installation must be tested for gas soundness.

3.8 Electricity Supply

a)
Wiring external to the appliance must be in accordance with BS 7671 (the
current I.E.E Wiring Regulations) for electrical installation and any local
regulations which apply.
b)
The mains cable must be at least 0.75 mm (24/0.2 mm) PVC insulated to
BS 6500 table 16.
c)
WARNING: THIS APPLIANCE MUST BE EARTHED. (Failure to provide a
satisfactory earth connection would be a safety hazard and may also result in
appliance malfunction).
d)
The method of connection to the mains supply must facilitate complete
electrical isolation of the appliance. 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 controls) may be used.

3.9 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 thermostat as
described in Section 4.
Supplied By www.heating spares.co Tel. 0161 620 6677
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