25
FOR GRAVITY D.H.W. AND PUMPED C. H.
When the boiler is to be used on a system with gravity
D.H.W. ensure that the overheat thermostat has been
disconnected as shown.
The overheat thermostat is now by-passed and will
allow the appliance to perform satisfactorily on gravity
circulation.
NOTE: Even though the overheat thermostat is not
operational, it must not be removed from the pocket in
the heat exchanger.
The recommended cable for connection to the
appliance terminal strip is 3-core 0.75mm
2
(24 x 0.2mm) P.V.C. IEC 53 code 227 (heat resistant).
WARNING: This appliance must be earthed.
Loosen securing screw sufficiently for the electrical
cover to be removed from the thermostat box.
Bare back input cable to
dimensions shown.
Fit input cable to terminal
block on left passing through
the grip provided.
The pump should be wired to the
junction box or programmer.
Replace electrical cover and securing
screw.
A cable clip is supplied in the kit to secure
the cable to the bottom of the combustion
box.
In the event of an electrical fault after installation of the
appliance, preliminary electrical system checks should
be carried out:- earth continuity, polarity and resistance
to earth.
3A
Fuse
Boiler
Thermostat
Gas
Valve
or
b
N
br
75
75
85
br
g/y
b