INSTALLATION

INSTALLATION

33 EXTERNAL ELECTRICAL CONTROLS

Wiring external to the boiler MUST be in accordance with the current I.E.E. (BS.7671) Wiring Regulations.

For Ireland reference should be made to the current ETCI rules for electrical installations.

The external fuse rating should be 3A.

Route the electrical supply flexible cord and the external control flexible cord as illustrated.

Lock the flexible cords in place with the clamps provided.

230V supply

ELECTRICAL CONNECTIONS FOR A COMBI BOILER

Optional Programmer Kits

Optional digital programmer kits are available with their relevant instructions.

Both 24hr and 7day kits are available.

thermostat should be wired into the system.

To maintain frost protection with the programmer selector switches set to OFF, all the 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.

External Programmers

On the combi boilers, this should be of the single channel type (as this boiler does not incorporate a pre---heat facility for the instantaneous hot water service).

Programmers with room thermostat --- see diagram B.

Note. lf the boiler is installed in a garage it may be necessary to fit a pipe thermostat, preferably on the return pipework.

Earths are not shown for clarity but must never be omitted.

A

Optional frost’stat

Room thermostat

 

 

 

 

 

 

 

 

L

N

 

T

T

 

 

 

 

 

 

Power supply

 

 

 

 

terminal block

 

 

2

1External controls

3terminal block

Note: the switch contacts of any external programmer, room or frost thermostat must be volt free. Connecting a switched live feed to external controls terminal block may be dangerous and will result in serious damage to the boiler.

Room Thermostat

This should be wired as shown in diagrams A.

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 hours without frost damage.

This appliance is provided with a built in anti---freeze system that operates the boiler when the temperature is below 5 ûC. Therefore, when the boiler is not lit and used in cold weather, with consequent risk of freezing do not isolate the boiler from the electricity supply or close the gas inlet cock.

B

External programmer

Optional frost’stat

T

Room thermostat

L N

T

Power supply terminal block

2 1

3

External controls

terminal block

 

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

N.B. These diagrams are schematic only and do not show external terminal strips etc.

28

mini HE --- Installation & Servicing

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Mamiya C28, C32, C24 manual External Electrical Controls, Electrical Connections for a Combi Boiler

C28, C24, C32 specifications

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