Notes on the documentation 4
0020289288_02 MicraCom Installation and maintenance instructions 9
4 Notes on the documentation
▶ Always observe all the operating and installation instruc-
tions included with the system components.
▶ Pass these instructions and all other applicable docu-
ments on to the end user.
These instructions apply only to:
Product article number
Article num-
ber
Gas Council
Number
MicraCom 24c-AS/1 (H-GB)
0010026136 47-019-58
MicraCom 28c-AS/1 (H-GB)
0010026137 47-019-59
5 Product description
This product is a gas-fired wall-hung condensing boiler.
5.1 Product design
2
1
3
4
12
13
16
14
15
17
11
7
5
6
7
8
9
10
1 Electronics box
2 Expansion relief valve
for heating
3 Condensate siphon
4 Pump
5 Gas valve assembly
6 Ignition and flame con-
trol electrode
7 Restrictor for the refer-
ence pressure pipe
8 Burner
9 Venturi
10 Heat exchanger
11 Reference pressure
pipe for the gas valve
assembly
12 Fan
13 Expansion vessel
14 Domestic hot water
plate heat exchanger
15 Domestic hot water
volume flow sensor
16 Pressure sensor
17 Prioritising diverter
valve
5.2 Safety Devices
5.2.1 Electrical Supply Failure
The boiler will not work without an electrical supply. Normal
operation of the boiler should resume when the electrical
supply is restored.
Reset any external controls, to resume normal operation of
the central heating.
If the boiler does not resume normal operation reset the
boiler. If the boiler does not resume normal operation after
this call your Installation/Servicing company or Glow worm
service.
5.2.2 Overheating Safety
The boiler software is designed to recognise the potential for
an overheat lockout and will shutdown before this happens.
To restart the boiler, press the button more than 3s.
If the boiler fails to resume normal operation and all external
controls are calling for heat, then call your Installation/ Servi-
cing company or Glow worm service.
5.2.3 Frost protection
The appliance has a built in frost protection device that pro-
tects the boiler from freezing. With the gas and electric sup-
plies ON and irrespective of any room thermostat setting, the
frost protection device will operate the pump when the tem-
perature of the boiler water falls below 8°C.
A timer is used so that the temperature can be checked peri-
odically. After 10 minutes the pump will be stopped if the
temperature is higher than 10°C or has already reached
35°C. The burner will activate if the boiler temperature does
not reach 10°C after 30 minutes or at any time if the temper-
ature drops to 5°C.
The burner will switch off when the temperature reaches
35°C.
5.2.4 Condensate Drain Blockage
During freezing conditions the condensate drain can become
blocked, this may be due to the forming of ice in the con-
dense drain external to the house. Release an ice blockage
by the use of warm cloths on the pipe.
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