gledhill GB35C, Design, Installation And Servicing Instructions

Page 9

c

ONDENSING 

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OMBI BOILE

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7.0  

cOMMISSIONING

7.4  cHEcKING THE BOILEr FuNcTIONS

This appliance is factory set and sealed. No adjustments are necessary. Access to sealed inner casing 
panel is not required.

a) 

Domestic hot water

Fully open a hot water tap. The boiler will sense the hot water demand and the burner will light, This will 
be indicated on the display as follows: -

- 

bar ‘a’ and/or bar ‘b’ will be ON to indicate that the HW demand is active

- 

bar ‘c’ will be ON to indicate that the boiler pump is on

- 

dot ‘D1’ will be on to indicate that the burner is on.

- 

Digits  – 4 will display system pressure e.g. ‘P1.6’

If the burner fails to light after 3 ignition attempts, ignition lockout will occur. To reset the appliance the 
central button (S1) beneath the display should be pressed.

With the boiler in operation for approximately 5 – 10 minutes check that the gas supply pressure is 
maintained at 0 mbar. Recheck with all other gas appliances also in operation.

The water outlet temperature will be automatically regulated to about 60oC. Check that the temperature 
stays approximately constant as the hot water tap is gradually closed and the boiler switches off (if CH 
not calling) when the hot water tap is closed.

If necessary the gas rate can be checked after running the boiler for 10 minutes with all other gas 
appliances and pilot lights (if any) in the dwelling turned off. The approximate value of the gas rate is 
3.6 m3/h.

If suitable equipment allows, a measurement of the CO can be obtained to further check the correct 
operation of the appliance. This can be taken from the flue sampling point located on the boiler flue 
turret elbow or the vertical flue adapter. Check that the readings are consistent with the details contained 
in the Technical Data Section 3 of these instructions.

Upon completion, shut the DHW tap, replace the sampling point cap and remove the gas pressure gauge, 
Check that the gas pressure sensing point is gas tight.

b) 

central heating

Ensure that the central heating timer and the room thermostat are calling for heat and all radiators are 
open i.e. being heated. Also no hot water taps should be open during this measurement. The boiler will 
now be operating in the CH mode and this will be indicated on the display as follows: -

- 

bar ‘d’ will be ON to indicate that the CH demand is active

- 

bar ‘c’ will be on to indicate that the boiler pump is on

- 

dot ‘D1’ will be on to indicate that the burner is on

- 

Digits  – 4 will display system pressure e.g. ‘P1.6’

With the CH timer and room thermostat calling for heat, fully open all the radiator valves and allow the 
heating system to heat up. Balance the radiators as necessary giving the required temperature difference 
across the heating system and set the bypass valve if necessary.

Allow the system to achieve full temperature and then switch off and isolate the appliance. Drain the 
system whilst still hot from the lowest part of the system ensuring all parts of the system are emptied. 
Fill and vent and treat the system as described previously.

c) 

user controls

Check that all external controls e.g. room thermostat and the central heating programmer are fully 
functional and give the expected response to the user operation.

Check the operation of the on/off switch and the appliance reset button on the boiler. When the burner is lit, 
the dot ‘D1’ will be on constantly. A fault is indicated by flashing dot ‘D’. To reset press ‘set/reset’ button S1.

as shown in ‘figure 7.1’
(Page 7)

as shown in ‘figure 7.1’
(Page 7)