Johnson Controls YORK B4IH 360, Installation Instructions Manual

Page: 18 / 42

8
GB
Fig.13
D4IG
model
Burner
model
Heating
capacity (kW)
Gas type
Gas valve adjustments (mbar)
Total (P.C.I.) Nett Main regualtor
2
nd
stage regu-
lator
st
stage regu-
lator
360/480 N420 30.7 7 2ND-H (G20) 0.5
GV: 9
GV2: 8.8
4.5
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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).
. 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).
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 adjustment
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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.