3.6
WATER SYSTEM
Connect the flow and return pipework to the boiler. Ensure a detachable coupling is used
at connection to the boiler (ie compression fitting) to enable heat exchanger removal if
required. Details of system requirements are given in Chapter 2 - Section 2.7 Water
Systems.
Connections:
35 mm compression X 35 mm compression.
3.7
GAS SUPPLY
Connect the gas supply to the appliance. Details of gas supply requirements are given in
Chapter 2 - Section 2.6 Gas Supply. Supply of adequate gas pressure (with the boiler
running) is critical to ensure reliable operation of the boiler.
Connections:
0.75 inch BSP male.
3.8
ELECTRICAL SUPPLY
The entry point for the electrical supply cable is in the base of the appliance (see Section
2.2 Service Connections fig. 2.1.2) via a cordgrip bush. Feed the cable through this bush
and route inside the cabinet to the connection strip located to the front bottom right of the
cabinet.
1.
The electrical supply must be as specified in Chapter 2 - Section 2.4 Electrical
Supply.
WARNING :
THIS APPLIANCE MUST BE EARTHED.
2.
All external controls and wiring must be suitable for mains voltage. Wiring should
be in 3 core PVC insulated cable not less than 24/0.2 mm (0.75mm) to BS 6500
Table 16.
3.
The supply connection may be via a 10 amp fused double pole switch, serving
only the boiler and system controls. (Refer to Chapter 2 - Section 2.4 Electrical
Supply).
4.
Securely tighten the terminal screws and route the cable through the re-openable
cable clips. Ensure all cables are secured and that the cord grip bush is tightened
to securely grip the main cable at entry to the cabinet.
The mains cable must be connected to the terminals as follows:-
N
-
Blue wire (Neutral)
L
-
Brown wire (Live)
-
Yellow/Green Wire (Earth)
Ensure connection is made such that if the cable slips in its anchorage the current
carrying conductors become taut before the earthing conductor.
WD51/2/1997 Chapter 3 : Installation
The Keston 170 Condensing Boiler
Installation & Servicing Instructions
Page : 19
