Installation Manual
Gas Fire Heater – Cod. 99962NA – November 2002
9
GAS VALVE MODULATION MINIMUM AND MAXIMUM
GAS PRESSURE SETTING
Adjust burner gas pressure through screw
A
(fig.3) as follows:
♦
Undo the screw of pressure point
B
(fig.3) and insert a pressure
gauge.
♦
Unscrew and remove the aluminium cap of regulator
A
(fig.3)
♦
Turn ON the water heater by opening a hot water tap to maximum
♦
Once the burner has fired, set the maximum gas pressure by turning
the regulator clockwise to increase (+) and anti-clockwise to
decrease (-) gas pressure.
♦
Once the maximum gas pressure has been set, without removing
the pressure gauge, proceed as follows to set the minimum gas
pressure.
♦
With the hot water tap still open at its maximum flow, move the
X2
selector in the position shown in fig.2/1 (‘selector position during gas
pressure setting’) and than turn
P3 trimmer
(fig.1) clockwise to
increase (+) or anti-clockwise to decrease (-) gas pressure.
♦
Once the minimum gas pressure has been set, move
X2
selector
back (fig.2) to its original position.
♦
Tighten the aluminium cap of the regulator, remove the pressure
gauge (fig.3) and tighten the
B
pressure point screw.
Gas type
Natural Gas
Liquid gas (LPG)
(G20)
(G30)
(G31)
Lower Wobbe Index (at 15°C - 1013 mbar)
MJ/m³
34.02
116.09
88
MJ/Kg
45.65
46.34
Rated feed pressure
mbar(mmCA)
20 (204)
30 (306)
37 (377)
minimum and maximum pressure
mbar
2.8 / 10.5
8.8 / 27
8.8 / 33
Consumption
m³/h
3.14
Kg/h
2.34
2.30
burner injectors Ø
mm
1.20
0.75
Gas connection
1/2"
1/2"
Ho
ne
yw
ell
56
605
7 0
002
98
472
6
V
MIN
F1 2AT
W
41
15CM
-1
022
PWM
X6
POST-VENT
8
1
2
X4
9
5
6
2
4
3
1
X1
P1
ME
T
LPG
3
2
X2
1
4
1
3
4
5
2
X3
7
6
X2
X2
Selector
Collector
Collector
Selector
A
B
X5
Maximum gas pressure adjusting screw
C
D
X2
P1
P3
Gas burner pressure point
Inlet gas pressure point
Minimum pressure mechanical adjustment
Selection for electrical and mechanical
minimum pressure adjusment
Natural Gas - LPG link
Fan over-run adjustment
Minimum setting adjustment
Selector position
during gas
pressure setting
X5
X2
P3
ELECTRONIC IGNITION BOARD W4115CM1022 FOR CVIm VALVE
Original selector
position
D
B
10
20
30
40
A
MANOMETRO
VALVOLA GAS VK4105G1005
C
Fig. 2
Fig. 2/1
Fig. 1
Fig. 3
