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7.1.2 Thermostatic radiator valves
If the radiators have thermostatic radiator valves or valves that
can be closed to isolate the flow completely from the return, a
minimum amount of water circulation (6ltrs/min *) must be
maintained by installing a manual fixed bypass as this will not
interfere with the pump modulation, (* also see §9.5).
7.1.3 Underfloor heating
Underfloor heating with pump
For eective operation of the DHW supply any undesired
circulation through the appliance as a result of a second pump
in the CH circuit must be avoided.
Connect the underfloor heating system in a hydraulically
neutral manner to the appliance, or install the CH circuit with
an normally open zone valve ( I ) to prevent flow through the
appliance heat exchanger when there is no CH demmand.
see §9.5. for minimum permissible water circu lation through
the boiler heat exchanger.
Underfloor heating connection diagram
A. Boiler
B. Under floor circulation pump
C. Thermostatic mixing valve
D. Spring-operated non-return valve
E. Normally closed 230V~ zone valve (Radiators)
E
1
. Normally closed 230V~ zone valve (Under floor)
F. Radiators (Fitted with TRV's except room stat location)
G. Programmable room thermostat
H. Limit thermostat
I. Normally open 230V~ zone valve (powered via X4 terminal 3)
A
G
H
F
B
C
D
I
E
E1
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