Water Components; Pump; Diverter Valve; Water Pressure Gauge - Potterton Envoy System 30 Installation & Service Instructions Manual

Servicing & Replacement of Parts - Page 24
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Fig.24
24 Servicing & Replacement of Parts
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17) Water Components.

Replacement of Pump, Diverter Valve (If Fitted) and Water
Pressure Gauge.
a) Remove decorative & functional doors as described in
'Servicing Boiler'.
b) Remove blanking screw and attach a hose to the drain
valve on the return pipe isolating valve.
c) Release system pressure by opening the pressure relief
valve on the boiler flow pipe.
d) Turn off the isolating cocks on the flow and return pipe
connections to the boiler and the boiler will drain.
e) Remove the clamping screw and lower the expansion
vessel to provide access to the water components.

Pump:

f) Disconnect the in-line connector on the pump supply
cable.
g) Undo the union nuts on the inlet and outlet connections
and lift out the pump.
h) Replacement is the reverse of removal. New seals
should be used on re-assembly.
Diverter Valve (If Fitted):
f) Disconnect the valve wiring from connections within the
plastic junction box. Release the cable restraint.
g) Disconnect the electrical connectors from the water
pressure switch.
h) Disconnect the pressure gauge connection from the
pressure relief valve.
j) Disconnect the D.H.W flow pipe at the union nut above
the diverter valve.
k) Disconnect the CH flow connection at the bracket where
it connects with the heat exchanger pipe.
l) Disconnect the CH flow pipe from the isolating cock.
m) Disconnect the nut at the base of the pressure relief
valve and swing the pipe out of the way.
n) Carefully lift out the assembly.
p) Replacement is the reverse of removal.

Water Pressure Gauge:

f) Disconnect the pressure gauge connector from the
pressure relief valve.
g) Disconnect the pressure gauge from the bracket under
the controls panel and remove the gauge.
h) Replacement is the reverse of removal.
Publication No. 559787