Protherm 80E User, Installation And Servicing Instructions - page 24
23
To replace pump
Drain down heating circuit only of boiler as follows:
•
From below boiler, close isolating valves on flow and return con-
nections to boiler.
•
Open boiler drain valve on left hand side of hydraulic
block.
Note:
It is not necessary to drain down entire heating circuit
to carry out this work.
Simplification:
for simpler work remove gas valve mod-
ule and right side cover.
•
Disconnect pump cable.
•
Remove 2 clips fixing pump, see diagram 20.
•
Unscrew 2 screws securing the pump to boiler bottom.
•
Lift up the pipe and remove pump by lifting forward and out of boiler.
•
Fit replacement pump in reverse order to removal.
•
Open isolating valves on flow and return connections.
•
Refill, vent and pressurise boiler. Check for leaks.
To replace safety valve
•
Drain down heating circuit of boiler as described previously.
Simplification:
for simpler work remove gas valve module and pump as described previously.
•
Remove expansion vessel hose from hydraulic block.
•
Remove draining pipe from safety valve and unscrew safety valve.
•
Fit replacement safety valve in reverse order to removal.
Important:
Seal the safety valve thread by jointing compound.
To replace domestic heat exchanger
•
Drain down heating circuit of boiler as described previously.
Drain down hot water circuit of boiler as follows:
•
From below of boiler, close cold water inlet isolating valve.
•
Open a hot tap to drain hot water circuit.
•
Remove gas valve.
•
Unclip pump and pull forwards.
•
Disconnect expansion flexible hose at connection to vessel
fixing.
•
Remove fixing screws and plate exchanger over hydraulic
block, see diagram 21.
•
Fit replacement heat exchanger in reverse order to removal,
ensuring seals are correctly positioned in hydraulic block.
•
Open isolating valves on flow and return connections, refill, vent and pressurise boiler.
Check for leaks.
•
Open cold water isolating valve. Check for leaks.
To replace overheat thermostats
Important:
Isolate boiler from electrical supply before this operation –
connections to overheat thermostats are mains voltage.
•
Locate overheat thermostats (
a
) and (
c
) to left hand side of sealed
chamber above thermistor, see diagram 22.
•
Unclip thermostat from pipe.
•
Pull off electrical connections from thermostat.
•
Fit replacement thermostat in reverse order to removal.
Note:
No heat sink compound is required. The polarity of the connections
is not important.
To replace heating water thermistor
•
Locate thermistor (
b
) clipped onto flow pipe to left hand side of sealed
chamber below overheat thermostat, see diagram 22.
•
Unclip thermistor from pipe.
•
Pull off electrical connections from thermistor.
•
Fit replacement thermistor in reverse order to removal.
Note:
No heat sink compound is required. The polarity of the connections is not important.
Diagram 21
Diagram 20
Diagram 22