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Servicing Instructions - Page 25
GRAVITY DHW/PUMPED CENTRAL HEATING
NOTE: If the boiler is fitted with a right hand flue, remove flue
elbow as described in Section 1 preparing the Boiler
operations F, G, page 22.
7.
Disconnect the fan supply leads from the connector
adjacent to the fan.
8.
Remove the screws securing the fan mounting plate
leaving in place the three screws identified with a red
circle or adjacent 'F' mark in Fan Plate. Remove
mounting plate complete with fan.
9.
Remove spring clip retaining overheat bulb to return
pipe.
10.
Remove two split grommets one at the top right hand
side of the casing and one in the base of the boiler.
11.
Withdraw bulb through the holes.
12.
Replacement is the reverse of removal. Ensure the
rubber grommets make a good seal around the
capillary. Ensure that the capillary is secure in clips
provided. Refer to Fig. 2.
13.
Follow the full commissioning procedure as detailed in
the COMMISSIONING section of these instructions.
Page 18.
BOILER THERMOSTAT
4.
Remove door by undoing the two lower fixing screws
and lifting door off the two upper hinge brackets.
5.
Disconnect the fan supply leads from the connector
adjacent to the fan.
6.
Remove the screws securing the fan mounting plate
leaving in place the three screws identified with a red
circle or adjacent 'F' mark in Fan Plate. Remove
mounting plate complete with fan.
7.
Disconnect the electrical connections as follows:-
two white from rear of thermostat Refer to FIGS. 27, 28.
8.
Pull off the outer thermostat knob.
9.
Remove inner thermostat post by undoing the two
securing screws.
10.
Remove the nut securing the thermostat to the control
box.
11.
If the boiler is fitted with a left hand flue, remove the flue
elbow as described in Section 1 'Preparing the Boiler'
operations F, G, Page 22.
12.
Remove the clip securing the thermostat bulb to the flow
pipe.
13.
Remove the split grommet in the base of the boiler and
the split grommet in the fan chamber. Feed the capillary
and bulb through the holes.
Supplied By www.heating spares.co Tel. 0161 620 6677
14.
Replacement is the reverse of removal. The bulb of the
new thermostat should be coated with heat conducting
paste. Ensure the rubber grommets in the base of the
boiler and the fan chamber make a good seal around
the capillary.
15.
Ensure that the capillary is secure in the clips provided.
NOTE polarity of electrical connections on thermostat is
not important.
Follow the full commissioning procedure as detailed in
the COMMISSIONING section of these instructions.
Page 18.
GRAVITY HOT WATER/PUMP OVER-RUN THERMOSTAT.
Refer to FIG. 2.
4.
Remove door by undoing the lower fixing screws and
lifting door off the two upper hinger brackets.
5.
Disconnect the electrical connections as follows:—
2 red wires from terminal NO or 4
2 brown wires from terminal NC or 2
1 white and 1 blue wire from terminal C or 3
6.
Remove the screw securing the thermostat to the
control box.
7.
Remove the split pin retaining the thermostat bulb in the
pocket and withdraw the bulb.
8.
Remove the split grommet in the base of the boiler.
Feed the capillary and bulb through the hole.
9.
Replacement is the reverse of removal. The bulb of the
new thermostat should be coated with heat conducting
paste. Ensure the rubber grommet makes a good seal
around the capillary.
10.
Ensure that the capillary is secure in the clips provided.
Follow the full commissioning procedure as detailed in
the Commissioning section of these instructions.
Page 18.
SIGHT GLASS
WARNING: GREAT CARE SHOULD BE TAKEN WHEN
HANDLING AND DISPOSING OF A BROKEN SIGHT
GLASS.
3.
Remove door by undoing the lower fixing screws and lift
door off the two upper hinge brackets.
4.
Remove three M4 nuts from sight glass retainer and
remove sight glass assembly, see above.
5.
Replacement is the reverse of removal. Taking care that
the clear circle in the sight glass lines up viewing hole in
combustion chamber door. NOTE new gaskets must be
used when sight glass is fitted.
25
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