HAMWORTHY HEATING LTD
20
CHESIL-ELECTRONIC
500001181/K
10.7 Replacement Of display PCB (Part No. 533901786) on Floor Mount Unit
The display PCB is assembled to the rear side of the inclined panel of the Floor mounted unit see Figure 27.
To replace :-
1)
Isolate the unit from the mains electrical supply.
2)
Remove securing screws found either side of the inclined top panel.
3)
Lift panel off and lay flat on top of the sheet metal front cover.
4)
Loosen screws securing the plastic box enclosing the display PCB to the inclined sheet metal panel.
5)
Disconnect ribbon cable plug from Display PCB.
6)
Remove the earth lead connection.
7)
Unfasten screws securing the display PCB on the stand off’s in the plastic box.
8)
Remove the display PCB from the stand offs and replace the PCB.
9)
Reassemble everything in reverse order making sure the seal is in place on the enclosure & reconnect the
mains electrical supply to the unit.
10.8 Replacement Of Low Water Level Switch (Part No. 531203006)
The tank contains a water level switch for general alarm indication.
1)
Isolate the unit from the mains water & electrical supplies.
2)
Remove the screw securing the front cover and remove front cover.
3)
Remove the lid from the main control box & disconnect terminals 1 & 2 on the control PCB.
4)
Loosen the nut off the cable gland through which the cable of the level switch is fed to the control box.
5)
Withdraw the terminalised end of the level switch cable through the cable gland and heat shrink tube.
6)
Drain the supply tank of water. Refer to Figure 31.
7)
Undo the nut on the outside of the tank securing the float switch to the tank and remove the defect float
switch. Refer to Figure 32.
8)
Replace the level switch and secure the bulkhead nut, ensuring the seal on the inside of the tank is cor-
rectly located and the float is operating correctly.
Figure 28 - Removal Of Inclined Panel
Figure 27 - Display PCB Location
Floor Standing Unit
Figure 30 - Assembly Of Display PCB In Enclosure
Figure 29 - Enclosure Disassembly
Summary of Contents for 563216020
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