65
11-1 Electrodes -
(GMHB227 shown)
DANGER
Before servicing, turn off electrical power to boiler at
service switch. Close manual gas valve to turn gas
supply OFF to boiler. Failure to comply will result in
death or serious injury.
!
11.4 Draining the Boiler
• turn boiler off
• isolate electrical supply
• close boiler gas service cock
• allow boiler to cool
• drain boiler through onboard drain if available or
external drain valve.
11.5 Draining the Heating Circuit
• Follow all steps in 11.4.
• Close central heating flow and return valves.
• Connect suitable pipe to drain point.
• Route it to suitable container.
• Open drain tap.
11.6 Final Commissioning
• Allow heating system to heat. Balance the system to
achieve temperature difference across heating supply and
return pipes at the boiler.
• Check system for proper volume and pressure. See page 4
for acceptable volume and pressure.
• Turn off boiler.
• Thoroughly flush water pipe work. Clean filters in heating
return and supply water isolating valves.
• Repressurize the system.
11.7 Final Assembly
• Place front jacket in position over boiler. Ensure bottom is
located behind the control panel. Secure in position at top
using screws previously removed.
• If boiler is to be left in service with the User, set controls
and room thermostat.
• If boiler is not to be handed over immediately, close boiler
gas service valve and turn off electrical supply.
• If there is possibility of boiler being left during frost
conditions drain boiler and system. See section
11: Component Replacement Or Periodic Cleaning.
Manufacturer recommends attaching a label to the boiler
drawing attention to the fact that the system has been
drained.
NOTICE
When servicing the appliance, check the condition and
position of flame sensing electrode and replace it if
necessary.
11.8 Replacement Parts
Perform Automatic Calibration procedure described as follows
if one or more of the following components are replaced.
Check and adjust CO2% value as indicated in the Combustion
Table.
Components replaced:
• Primary heat exchanger
• Fan
• Gas valve
• Gas nozzle
• Burner
• Flame sensing electrode
0.20po (
+ 0.0
4)
5 m
m (
+1)
0.39po (
+ 0
.04)
10 m
m (
+1)
PN 240012369, REV A [08/31/2018]
11 - GENERAL MAINTENANCE AND CLEANING
Содержание GMHB227
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