Gas Valves; Co Checking And Setting Values - Baxi POWER HT+ Series Installation And Service Manual

7 Commissioning
Fig.66 POWER HT+ 1.50 – POWER HT+
1.70
1
Fig.67 POWER HT+ 1.90 – POWER HT+
1.110
2
1
Tab.24 Checking and setting values for gas type G20
Diameter of the Venturi
Diameter of the nozzles
Minimum CO
2
(1)
Maximum CO
(1)
2
Maximum CO
(1) The CO value is valid with the front panel mounted. If the front panel is removed (open chamber), the value readout is lower by 0.2%.
2
62

7 7 .4.4 Gas valves

1 Gas flow rate setting screw
2 OFFSET setting screw:
3 Gas supply pressure outlet
3
2
MW-3000045-01
1 Gas flow rate setting screw
2 OFFSET setting screw:
3 Sealed chamber pressure signal
4 4 Gas supply pressure outlet
Tab.23 Settings values for a new gas valve on POWER HT +
The settings screw is screwed down as far as it will go and is then is un­
screwed according to the number of turns given in the following table.
Boiler model
3
POWER HT+ 1.50
POWER HT+ 1.70
POWER HT+ 1.90
POWER HT+ 1.110
7.4.5 CO
Unit POWER HT+ 1.50
mm 24
mm 3.70 (no. 2)
% 8.5
% 9.0
ppm < 250
Remove the plug
Use a 4 mm hexagonal spanner
Remove the plug
Use a flat-blade screwdriver
Nominal heating flow
rate:
Number of turns for the
gas flow rate settings
screw
12
13
2 + 2/3
2 + 1/3
checking and setting values
2
POWER HT+ 1.70 POWER HT+ 1.90
30 34
5.30 (no. 2) 5.60 (no. 2)
8.5 8.5
9.0 9.0
< 250 < 250
Minimum heating flow
rate:
Number of turns for the
OFFSET settings
screw
5 + 3/4
5 + 3/4
5 + 3/4
5 + 3/4
POWER HT+ 1.110
38
6.40 (no. 2)
9.0
9.2
< 250
7609474 - v02 - 04092014