Keston Combi 35kw User Manual download pdf (Page 29)

INSTALLATION

Keston Combi - Installation and Servicing

EXTERNAL ELECTRICAL CONTROLS

Wiring External to the Boiler

The fuse rating should be 3A.

Wiring external to the boiler MUST be in accordance with

the current I.E.E. (BS.7671) Wiring Regulations and any

local regulations.

Frost Protection

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

programmer selector switches are set to OFF and all the

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.

Note. If the boiler is installed in a garage it may be

necessary to t a pipe thermostat, preferably on the return

pipework.

Earths are not shown for clarity but must never be

omitted.

OpenTherm Programmable Room Temperature Control

Note. These terminals MUST ONLY be connected to an

OpenTherm Controller, (such as the Keston Chronothern Room

Controller (c.17.4.21.00.0). Connecting any other device /

control wiring may destroy the primary PCB.

1. Isolate the mains supply to the boiler.

2. Remove the front panel. Refer to Frame 39.

3. Swing the control box down into the servicing position. Refer

to Frame 45.

4. Remove the control box cover. Refer to Frame 57, no’s 3

and 4.

5. Unclip the 3 way in-line connector containing 2 purple wires

and 2 red wires.

6. Connect this 3 way connector to the 3 way connector

containing 2 purple wires wired from the 4 way terminal

block.

7. Connect the two wires from the OpenTherm Programmable

Room Temperature Control to the two LH connections of the

terminal block as shown.

8. Re-assemble in reverse order.

3G9990a

Room Stat Frost Stat

Mains In

Programmable Room Stat

Room Stat Frost Stat

Mains In

Use of General Live for Room Stat

Programmable

Room

Stat

Room

Stat

Optional

Frost Stat

Optional

Frost Stat

INSTALLATION

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Keston Combi 35kw User Manual Page 29

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