Water System; Gas Supply; Electrical Supply - Keston Qudos 28h User, Installation And Servicing Instructions

WD440/3/2007
4.6

WATER SYSTEM

Connect the flow and return HEATING CIRCUIT system pipework to the boiler. Details of
system requirements are given in Chapter 3 - Section 3.7 Water Systems.
Connections
For optimum performance after installation, this boiler and its associated central heating
system must be flushed in accordance with the guidelines given in BS7592:1992,
"Treatment of water in domestic hot water central heating systems".
This must involve the use of a proprietary cleaner, such as Fernox Superfloc, or
BetzDearborn's Sentinel X300 or X400. Full instructions are supplied with the products,
but for immediate information, please contact Fernox on 01799 550811 or BetzDearborn
on 0151 420 9563.
For long term protection against corrosion and scale, after flushing, it is recommended
that an inhibitor such a Fernox MB1 or BetzDearborn's Sentinel X100 is dosed in
accordance with the guidelines given in BS7593:1992.
4.7

GAS SUPPLY

Connect the gas supply to the appliance. Details of gas supply requirements are given in
Chapter 3 - Section 3.6 Gas Supply. Supply of adequate gas pressure (with the boiler
running) is critical to ensure reliable operation of the boiler.
Connections
4.8

ELECTRICAL SUPPLY

The entry point(s) for the electrical supply cable(s) is in the base of the appliance (see
Section 3.2 Service Connections fig. 3.1.2) via a cordgrip bush. Feed the cable through
the bush and route inside the cabinet to the connection strip located to the front bottom
right area of the cabinet.
1. The electrical supply must be as specified in Chapter 3 - Section 3.4 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 0.75mm
Table 16 (material code H05VV-F).
3. The permanent live supply connection may be via a 3 amp fused double pole
switch, serving only the boiler. (Refer to Chapter 3 - Section 3.4 Electrical Supply).
Any 230VAC system controls for the boiler must also be supplied via this isolator.
4. Basic Wiring Installation
Securely tighten the terminal screws and route the cable(s) 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. Remove the
factory fitted link wire between the room thermostat terminals on the boiler.
The supply cable(s) must be connected to the main terminals as follows:-
Ensure connection is made such that if the cable slips in its anchorage the current
carrying conductors become taut before the earthing conductor.
Installation & Servicing Instructions
Chapter 4 : Installation
: 0.75 inch BSPM
: 0.5 inch BSPM
THIS APPLIANCE MUST BE EARTHED.
Main Supply L
Main Supply N
Main Supply E
CH Demand SL1
System Pump L
System Pump N
System Pump E
The Keston Qudos 28h & Qudos 28hP Boilers
- Brown wire (Live) 3A permanent supply
- Blue wire (Neutral) for 3A permanent
- Yellow/Green Wire (Earth)
- 230V Switched Live - i.e. Room Thermostat
- Brown wire (Live) to system pump
- Blue wire (Neutral) to system pump
- Yellow/Green wire (Earth) to system pump
2
(8.0mm dia) to BS 6500
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