Tab.33 Checking and setting values for gas type G20 / G25 / G25.1 / G27 / G31
Boiler model
Maximum CO (ppm)
POWER HT+ 1.130
< 250
POWER HT+ 1.150
< 250
POWER HT+ 1.200
< 250
POWER HT+ 1.250
< 250
Tab.34 Authorised CO
2
ranges at minimum output
Boiler model
Type G20
Type G25
Type G25.1
Type G27
Type G31
POWER HT+ 1.130
8.5 +0/-0.2
8.5 +0/-0.2
10.0 +0/-0.2
8.5 +0/-0.2
9.7 +0/-0.2
POWER HT+ 1.150
8.5 +0/-0.2
8.5 +0/-0.2
10.0 +0/-0.2
8.5 +0/-0.2
9.7 +0/-0.2
POWER HT+ 1.200
9.0 +0/- 0.2
8.9 +0/-0.2
9.3 +0/-0.3
8.4 +0/-0.2
10.0 +0/-0.2
POWER HT+ 1.250
8.45 +0/- 0.2
8.9 +0/-0.2
9.3 +0/-0.3
8.4 +0/-0.2
10.0 +0/-0.2
8.4.4
Gas valve basic settings
Tab.35 Settings values for a new gas valve
Boiler model
Nominal heat input:
Number of turns for the gas flow rate set
tings screw
Minimum heat input:
Number of turns for the OFFSET set
tings screw
POWER HT+ 1.130
4 + 1/4
2
POWER HT+ 1.150
4
2 + 1/2
POWER HT+ 1.200
1 + 1/4
7 + 3/4
POWER HT+ 1.250
1 + 3/8
8 + 5/8
1 Gas flow rate setting screw
The settings screw is screwed down as far as it will go and is then
unscrewed according to the number of turns given in the above
table.
2 OFFSET setting screw:
1
.
Remove the protective cap.
2
.
Use a Torx screwdriver (T40) or flat-head screwdriver (10 mm).
3 The settings screw is screwed down as far as it will go and is then
unscrewed according to the number of turns given in the above
table.
4 Refit the cap using a Torx screwdriver (T40) or flat-head
screwdriver (10 mm).
Fig.96
Gas valve for POWER HT+ 1.130
and POWER HT+ 1.150
MW-5000727-1
8 Commissioning
72
POWER HT +
7702630 - v02 - 11082018
