Before operating with a different type of gas, carry out the following steps:
1. Fit the gas diaphragm in the gas valve unit (if necessary, see table). If
the boiler is modified, for G30/G31 (butane/propane) :
Tab.44 Gas diaphragm for G30/G31 (butane/propane)
Gas diaphragm for G30/G31 (butane/propane) Ø (mm)
AMC 15 3.95
AMC 25 3.95
AMC 25/28 MI 3.95
AMC 35 -
2. Set the fan speed as indicated in the table (if necessary). The setting
can be changed with a parameter setting.
Tab.45 Factory settings G20 (H-gas)
Code Display text Description Adjustment range 15 25 25/28
MI
35
DP003 Abs. max fan DHW Maximum fan speed on
Domestic Hot Water
1000 Rpm – 7000 Rpm 4500 5600 6200 6200
GP007 Fan RPM Max CH Maximum fan speed
during Central Heating
mode
1400 Rpm – 7000 Rpm 4500 5600 4600 6200
GP008 Fan RPM Min Minimum fan speed
during Central Heating
+ Domestic Hot Water
mode
1400 Rpm – 4000 Rpm 1800 1900 1900 1850
GP009 Fan RPM Start Fan speed at appliance
start
1000 Rpm – 4000 Rpm 3700 3000 3000 4000
Tab.46 Adjustment for gas type G30/G31 (butane/propane)
Code Display text Description Adjustment range 15 25 25/28
MI
35
DP003 Abs. max fan DHW Maximum fan speed on
Domestic Hot Water
1000 Rpm – 7000 Rpm 4100 4900 5400 5400
GP007 Fan RPM Max CH Maximum fan speed
during Central Heating
mode
1400 Rpm – 7000 Rpm 4100 4900 3850 5400
GP008 Fan RPM Min Minimum fan speed
during Central Heating
+ Domestic Hot Water
mode
1400 Rpm – 4000 Rpm 2200 1900 1900 1850
GP009 Fan RPM Start Fan speed at appliance
start
1000 Rpm – 4000 Rpm 3700 3000 3000 4000
3. Check the setting of the gas/air ratio at full and part load.
For more information, see
CU-GH08 control unit settings, page 85
7.3.2 Fan speeds for overpressure applications
In the event of an overpressure application (e.g. CLV), the volume flow of
the fan must be adjusted in accordance with the table below.
Fig.68
Installing gas diaphragm
7 Commissioning
7686707 - v.01 - 06092018 AMC 71
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