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WD53/0/1999
3.9
ELECTRICAL SUPPLY
The entry point(s) for the electrical supply cable(s) is in the base of the appliance (see
Section 2.2 Service Connections fig. 2.1.2) via two cord grip bushes. Feed the cable(s)
through its 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 :
2.
All external controls and wiring must be suitable for mains voltage. Supply wiring
should be in PVC insulated cable not less than 1.0mm
(material code H05VV-F). Pump wiring from the boiler pump connection should
be in 3 core PVC insulated cable not less than 0.5mm
(material code H05VV-F).
3.
The permanent live supply connection may be via a 10 amp fused double pole
switch, serving only the boiler. (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 supply cable(s) must be connected to the main terminals as follows:-
Terminal 2
Terminal 1
Terminal 3
Terminal 17 & 18
The pump cable, if used, must be connected to the pump terminals as follows:-
Terminal 6
Terminal 4
Terminal 7
NB:
Ensure connection is made such that if the cable slips in its anchorage the current
carrying conductors become taut before the earthing conductor.
3.10
EXCHANGING A BOILER
Before removing an existing boiler add Fernox Supafloc , or equivalent cleaning agent, in
accordance with the manufacturers instructions. Open all radiator valves and fire the
boiler. When the system is fully heated, shut off the gas supply and drain down the central
heating system.
Important
The Keston condensing boiler contains components which could be damaged or blocked
by grease, dirt or solder etc. It is essential that sludge or scale is removed from an existing
system.
The guarantee provided with the Keston does not cover damage caused by system debris
or sludge.
Connect the new boiler as instructed in this manual and fit in accordance with Sections
3.1 to 3.8
For sealed systems, fill to a pressure of about 2.7 bar. Check the complete system for
water soundness. If leaks need to be rectified using flux or solder the system must be
flushed cold again before proceeding.
Installation & Servicing Instructions
Chapter 3 : Installation
THIS APPLIANCE MUST BE EARTHED.
N
-
L
-
E
-
-
N
-
L
-
E
-
The system circulating pump should not have a locked rotor current rating
exceeding 2A if powered via Terminal 4 of the boiler main terminal block.
The Keston 260 & 340 Condensing Boilers
2
to BS 6500 Table 16
2
to BS6500 Table 16
Blue wire (Neutral) for 10A permanent supply
Brown wire (Live) 10A permanent supply
Yellow/Green Wire (Earth)
On/Off User controls volt free control link
Pump neutral wire (blue)
Pump live wire (brown)
Pump earth (yellow/green)
Page : 15
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