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15
Connect the gas supply to the gas service cock using a suitable
jointing compound.This is located at the lower right hand corner
of the appliance. See fig 29.
4.7
WATER CONNECTIONS
See Section 3.7 for detailed information.
The appliance has two 22mm and two 28mm compression
connections.
The upper two are flow connections and the lower two are return
connections.
FULLY PUMPED CH & DHW SYSTEMS
The flow must be connected to the upper 22mm connection.
The return must be connected to the lower 22mm connection.
PUMPED CH & GRAVITY DHW SYSTEMS
The CH flow must be connected to the upper 22mm connection.
The CH return must be connected to the lower 22mm connection.
The GRAVITY flow must be connected to the upper 28mm
connection and must continue upwards to the cylinder.
The GRAVITY return must be connected to the lower 28mm
connection.
4.8
WIRING INSTRUCTIONS
The appliance comes from the manufacturer with the Aquastat set
for a FULLY PUMPED system since these are the most popular and
give the householder the most economical heating system.
However, should the boiler be installed for use with a combined
PUMPED CH & GRAVITY DHW system, the small ‘jumper’ plug in
the front of the control box must be repositioned in the gravity
position. (fig 24)
Wiring diagrams fo fully pumped and gravity circuits are shown in
Figs 25,26 & 27.
22
PIPEWORK INSTALLATION
23
MAINS WIRING TO BOILER
24
4.8.2
BOILER CONNECTIONS
This boiler must have a permanent mains supply and be earthed.
Connect the mains supply cable, the pump live and the switched
live to the terminal block situated at the front right hand side of
the boiler. It is essential to clamp all these wires using the cable
clamp adjacent to the terminal block. Standard colours for the
supply are :- brown - live (L), blue neutral (N) and green/yellow -
earth (E).
The outer insulation on the cable should not be cut back beyond
the cable clamp.
Ensure the earth wire is longer than remaining wires to ensure it
will be the last to become disconnected should excessive strain be
put on the cable.
PUMPED & GRAVITY OPERATION
4.8.1
FULLY PUMPED OR COMBINED
28mm
DHW FLOW
22mm
HEATING
FLOW
28mm
DHW
RETURN
22mm
HEATING
RETURN
L
PERMANENT
LIVE
2
PUMP LIVE
CONNECTION
1
SWITCHED LIVE
CONNECTION
CABLE
RESTRAINING
CLAMP
N
NEUTRAL
EARTH
RESET
BUTTON
GAS CONNECTION
4.6
