Johnson Controls D4IC-360-480 Instrucciones De Instalación página 18

Gas pressure adjustment at
burner feed manifold
This equipment is dispatched from the fac-
tory 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 the "Gas valve adjustment table" (see
Fig. 2).
Gas valve adjustment
D4IG Burner
model model
360/480 N420
Note:
The GV gas valve corresponds to heat stages  and 3 of the unit.
The GV2 gas valve corresponds to heat stages 2 and 4 of the unit.
8
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. 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 GV and GV2.
2. With heat stages , 2 and 3 in opera-
tion:
- Adjust the st stage regulator V on
valve GV2 (pressure reading in Pc).
Heating
capacity (kW)
Total (P.C.I.)
30.7
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Fig.13
Gas type
Nett
7 2ND-H (G20)
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3. With heat stage  only in operation:
- Adjust the st stage regulator V on
valve GV (pressure reading in Pc).
4. Once adjustments are finished, tighten
lock screw (T) of the regulating fly-
wheels.
5. Turn the unit on, with the 4 heat stages,
for at least 5 minutes, and check the
CO and CO2, as indicated in point No.
5 of "Check list after start-up".
Gas valve adjustments (mbar)
2 stage regu-
nd
Main regualtor
lator
GV: 9
0.5
GV2: 8.8
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 stage regu-
st
lator
4.5