Technical information

37
18.6.- Adjustment gas valve/thermal switches
D4IG
model
Burner
model
Heating capacity (kW)
Gas type
Gas valve adjustments (mbar)
Heat switch limits
(°C)
Total (P.C.I.) Nett
Main
regulator
2
nd
stage
regulator
1
st
stage
regulator
Automatic
reset
Manual
reset
360/480 N420 130,7 117 2ND-H(G20) 10,5
GV1: 9
GV2: 8,8
4,5 82 93
Note: The GV1 gas valve corresponds to heat stages 1 and 3 of the unit.
The GV2 gas valve corresponds to heat stages 2 and 4 of the unit.
18.7.- Adjustment gas pressure at burner feed
manifold
This equipment is dispatched from the factory tested and
prepared for natural gas of the 2ND-H (G-20) type.
When adjustment is needed, it can be done in the following
sequence:
Set the 2 gas valves to the values stipulated in section 18.6
and in compliance with Fig. 18.
1. With the 4 heat stages in operation:
- Adjust the main regulator (pressure reading in Pa).
- Adjust the 2nd stage regulator V2 (pressure reading in
Pc). Pay close attention to the different values in both
valves GV1 and GV2.
2. With heat stages 1, 2 and 3 in operation:
- Adjust the 1
st
stage regulator V1 on valve GV2 (pres-
sure reading in Pc).
3. With heat stage 1 only in operation:
- Adjust the 1
st
stage regulator V1 on valve GV1 (pres-
sure reading in Pc).
4. Once adjustments are finished, tighten lock screw (T)
of the regulating flywheels.
5. Turn the unit on, with the 4 heat stages, for at least 15
minutes, and check the CO and CO
2
, as indicated in
point No. 5 of section 18.5.
18.8- Gas consumption
Based on natural gas of the 2ND-H, G-20 type, at 20 mbar
and 15° C.
D4IG model Heat stages
Gas consumption
mm³/h
360/480
100% 12,8
75% 11
50% 9
25% 4,5
- Fig. 20 -
GAS VALVE
GV1
GV1 GV2
GAS VALVE
GV2