INSTALLATION

INSTALLATION

45 TWO SPRING CLOSED VALVE

Pumped only

Notes.

1. Some earth wires are omitted for clarity. Ensure proper earth continuity when wiring.

2. Numbering of terminals on thermostats is specific to the manufacturer.

3. This is a fully controlled system - set the boiler thermostat to maximum.

4. Switchmaster valve has grey and orange auxiliary switch leads but the grey wire must be connected to the live supply.

LEGEND

gy

grey

b

blue

y/g

yellow/green

bk

black

or

orange

br

brown

v

violet

r

red

pk

pink

y

yellow

 

 

w

white

 

 

46 FROST PROTECTION

Central heating systems fitted wholly inside the house do not normally require frost protection as the house acts as a 'storage heater' and can normally be left at least 24 hrs. without frost damage. However, if parts of the pipework run outside the house or if the boiler will be left off for more than a day or so, then a frost thermostat should be wired into the system.

This is usually done at the programmer, in which case the programme selector switches are set to OFF and all other controls MUST be left in the running position.

The frost thermostat should be sited in a cold place but where it can sense heat from the system.

Wiring should be as shown, with minimal disturbance to other wiring of the programmer.

Designation of the terminals will vary but the programmer and thermostat manufacturer's leaflets will give full details.

If a boiler is installed in a garage it may be necessary to fit a pipe thermostat.

Diagram A shows a double pole frost thermostat, which should suffice for all systems which do not use the OFF terminals of the programmer.

Diagram B shows a 'change-over' frost 'stat', which will cover most systems which do use CH OFF. If, however, on such a system the HW pipework is in an isolated part of the house, a second frost 'stat may be used to protect it. If in doubt, ask your installer for advice.

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classic HE - Installation & Servicing

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IDEAL INDUSTRIES HE12, HE9, HE18, HE15 manual Installation TWO Spring Closed Valve, Frost Protection

HE12, HE15, HE18, HE9 specifications

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