Supplied By www.heating spares.co Tel. 0161 620 6677
24
80EC
Diagram 23
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.
To replace hot water thermistor
•
Pull off electrical connections from thermistor and unscrew thermistor (b) from left part of hydraulic block,
see diagram 21.
•
Remove gas valve module as described previously.
•
Fit replacement thermistor in reverse order to removal.
Note:
The polarity of the connections is not important.
To replace printed circuit board (PCB)
Important:
Isolate boiler from electrical supply before this operation.
•
Gently squeeze metal clip securing the control panel box, lift it up and hinge down.
•
From behind control panel box, unscrew and remove 4 screws securing PCB cover to panel.
•
Pull off electrical plugs from PCB.
•
Remove 4 screws securing PCB to panel and lift out PCB.
•
Fit replacement PCB in reverse order to removal.
To replace display and control panel board
Important:
Isolate boiler from electrical supply before
this operation.
•
Remove PCB cover as described in
‘To replace PCB’
.
•
Pull off electrical plug of display (A) from PCB, see
diagram 23.
•
Remove 4 screws securing PCB to panel and lift out
PCB.
•
Remove 4 screws securing display and control panel
bord to panel and gently lift it out.
•
Fit replacement display and control panel board in re-
verse order to removal.
To replace timeclock
•
Remove PCB cover as described in
‘To replace PCB’.
•
Disconnect clock electrical connections from PCB. Unclench plastic clips securing
timeclock to lower front panel and remove timeclock from panel.
•
Fit replacement timeclock in reverse order to removal.
To replace pressure gauge
•
Drain boiler as described in
‘To replace pump’.
•
Unclip pressure gauge clip and pull it out.
•
Disconnect pressure gauge cable.
•
Fit replacement pressure gauge in reverse order to removal.
To replace heat exchanger
•
Drain down heating circuit of boiler only as described previ-
ously.
•
Remove sealed and combustion chamber covers and side
cases as described previously.
•
Remove overheating termostats from heat exchanger pipes.
•
Pull off spring clips securing heat exchanger pipes to heat
exchanger.
•
Manoeuvre heat exchanger pipes down to disengage from heat
exchanger.
•
Gain acces to heat exchanger by removing fan and flue hood.
•
Remove heat exchanger by sliding forward and out of boiler.
•
Fit replacement heat exchanger in reverse order to removal.
•
Open isolating valves on flow and return connections, refill, vent and pressurise
boiler. Check for leaks.
Diagram 24
Summary of Contents for 80EC
Page 2: ...Supplied By www heating spares co Tel 0161 620 6677 ...
Page 19: ...Supplied By www heating spares co Tel 0161 620 6677 17 80EC FLUE CONFIGURATIONS Diagram 1 1 ...
Page 31: ...Supplied By www heating spares co Tel 0161 620 6677 29 80EC ...
Page 32: ...Supplied By www heating spares co Tel 0161 620 6677 27 March 2001 ...
