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Fig.68
Installing gas diaphragm
AD-3000834-01
Tab.45
Factory settings G20 (H-gas)
Code
Display text
DP003
Abs. max fan DHW
GP007
Fan RPM Max CH
GP008
Fan RPM Min
GP009
Fan RPM Start
Tab.46
Adjustment for gas type G30/G31 (butane/propane)
Code
Display text
DP003
Abs. max fan DHW
GP007
Fan RPM Max CH
GP008
Fan RPM Min
GP009
Fan RPM Start
7686707 - v.01 - 06092018
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)
AMC 15
AMC 25
AMC 25/28 MI
AMC 35
2. Set the fan speed as indicated in the table (if necessary). The setting
can be changed with a parameter setting.
Description
Adjustment range
Maximum fan speed on
1000 Rpm – 7000 Rpm 4500
Domestic Hot Water
Maximum fan speed
1400 Rpm – 7000 Rpm 4500
during Central Heating
mode
Minimum fan speed
1400 Rpm – 4000 Rpm 1800
during Central Heating
+ Domestic Hot Water
mode
Fan speed at appliance
1000 Rpm – 4000 Rpm 3700
start
Description
Adjustment range
Maximum fan speed on
1000 Rpm – 7000 Rpm 4100
Domestic Hot Water
Maximum fan speed
1400 Rpm – 7000 Rpm 4100
during Central Heating
mode
Minimum fan speed
1400 Rpm – 4000 Rpm 2200
during Central Heating
+ Domestic Hot Water
mode
Fan speed at appliance
1000 Rpm – 4000 Rpm 3700
start
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.
Gas diaphragm for G30/G31 (butane/propane)
15
15
7 Commissioning
Ø (mm)
3.95
3.95
3.95
-
25
25/28
35
MI
5600
6200
6200
5600
4600
6200
1900
1900
1850
3000
3000
4000
25
25/28
35
MI
4900
5400
5400
4900
3850
5400
1900
1900
1850
3000
3000
4000
AMC
71
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