Protherm 100 User Instructions - page 19
19
Replacement of parts
To gain access to the boiler components, proceed as follows:
•
Isolate boiler from electrical supply.
•
Remove outer case by grasping and gently pulling forwards.
•
Supporting sealed chamber cover, unclip two clips securing cover to sealed chamber and lift off cover.
•
Gently squeeze the two moulded plastic clips securing the lower front panel to the side panels; the lower front
panel will now hinge down.
To replace fan
•
Disconnect power supply and earth leads to fan.
•
Supporting fan, unscrew and remove two screws securing
fan to front of flue hood, see diagram 18.
•
Gently ease fan forwards and out of boiler.
•
Fit replacement fan in reverse order to removal making sure
that mounting plate engages correctly onto flue hood
Important:
Ensure that fan outlet is correctly fitted into flue elbow
at top of boiler.
To replace air pressure switch
•
Locate air pressure switch in upper left hand corner of
sealed chamber.
•
Pull off clear plastic tube from base of switch.
•
Remove electrical connections from switch.
•
Unscrew and remove two screws securing switch to upper panel and remove switch
– (or unclip air pressure switch from plastic holder – depends on type of switch used).
•
Fit electrical connections to replacement switch as follows:
One to the microswitch connection marked ‘NO 2’
One to the microswitch connection marked ‘COM 3’
•
Fit replacement switch in reverse order to removal.
Important:
Refit clear plastic tube as follows:
Tube from tapping point of flue hood to switch point ‘P 2 -’
To replace pump
Drain down heating circuit only of boiler as follows:
•
From below boiler, close isolating valves on flow and return connec-
tions 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.
•
Undo screw
A
and remove pump electrical connection cover, see
diagram 19.
•
Unscrew electrical connections and disconnect pump cable.
•
Supporting pump, unscrew pump connection nuts at top and rear of
pump. 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 gas valve module
•
Locate gas valve module attached to side of gas valve,
see diagram 20.
•
Unscrew screw (
a
) securing cover onto gas valve module.
•
Remove cover and disconnect multi-plug from module.
•
Disconnect ignition and flame sense leads from module and withdraw module from gas valve.
•
Fit replacement module in reverse order to removal.
•
Reconnect ignition and flame sense leads, the connections are uniquely sized to ensure correct replacement.
•
Refit cover ensuring all sealing grommets are correctly located in module body.
A
Diagram 19
Diagram 18