Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 22 / 46

Page 22
6.12 CIRCULATING PUMP ITEM 24
NOTE: The base section of the pump should never
require replacement. Instructions detail replacement of
the pumphead.
6.13.1 Refer (o Section 6.1. 6.2.1. 6.3 (drain CH circuit)
and 6.4.
6.13.2 Remove electrical cover from pump — one screw.
6.13.3 Disconnect two wires and remove the earth
connection — one screw.
6.13.4 Undo two alien screws and remove pump-head.
6.13.5 When replacing, speed adjuster is at top. Set to
the speed setting previously used.
6.14 THERMOSTATS AND TEMPERATURE /
PRESSURE GUAGE
6.14.1 Refer to sections 6.1, 6.2.1, 6.2.4 (right hand side
panel), 6.2.5 (except Anticondensing Thermostat) and 6.4
Fig 6.4
POSITION OF THERMOSTATS AND
THERMOSTAT PHIALS
Thermometer/pressure gauge only — drain CH circuit
— Section 6.3.
6.14.2 Identify the phial of the thermostat or ther-
mometer to be replaced (fig. 6.4).
6.14.3 Remove the spring clip from the respective
phial boss.
6.14.4 Trace the capillary to the control body.
6.14.5 Safety (overheat) thermostat, item 65
i) Unscrew the reset button cover.
II) Disconnect two leads.
iii) Unscrew locknut and remove thermostat.
6.14.6 Anticondensing thermostat, item 62
i) Disconnect two leads and remove thermostat.
ii) Remove the two screws attaching the anticon-
densing thermostat to the fixing bracket.
6.14.7 Boiler thermostat, item 61
i) Remove control knob.
ii) Remove two fixing screws.
iii) Disconnect two electrical leads.
6.14.8 Pressure temperature gauge, item 67
I)Unscrew the pressure sensor (Union, item 29).
ii) Depress two plastic clips and push gauge out.
forwards
Fig 6.5 PRESSURE RELIEF VALVE
6.15.1 Refer to Sections 6.1. 6.2.1 (right). 6.2 4. 6 3
(Drain CH circuit) and 6.4
6.15.2 Disconnect the water pressure gauges probe
(placed on the top of the valve).
6.1 5.3 Disconnect the valve from the union on the
respective pipe coming out of the boiler Remove the
valve
WARNING- It is essential to fit a suitable discharge
pipe (1 5mm diameter) 10 the pressure relief valve