23
fuel conversion
The unit is shipped from the factory calibrated for NG or LP
vapor operation. To convert the engine from NG to LP vapor
or from LP vapor to NG operation, follow these steps:
1. Set generator circuit breaker to
off
2. Set control panel system switch to
off
3. Remove 15 Amp fuse from system control panel.
4. Remove Zero Pressure Regulator (ZPR) tower cap (
a
).
The Main Adjust control is shown as (
B
).
5. Calibrate O
2
sensor per Analyzer manufacturer
specification. Install O
2
sensor into exhaust pipe.
(Note: technician supplies O
2
sensor and analyzer)
6. Attach timing light to #1 spark plug on engine (see
engine manual for diagram).
7 In control panel enclosure, “OPEN” fuel selector
jumper for NG operation and “CLOSE” connector
for LP operation. See schematic or wire diagram for
further information.
8. Re-install 15 Amp fuse in system control panel.
9. Set generator circuit breaker to
on
10. Set control panel system switch to
auto
11. After purging fuel supply line, push
ManuaL oVer-riDe
button on control panel for six
seconds. When engine starts, allow unit to warm up
for ten minutes under no load.
note
: If utility power is not connected, the generator
will start automatically.
12. Using technician-supplied timing light, locate timing
marks on crankshaft vibration dampener.
13. If timing is not within specification, loosen distributor
hold-down clamp. While observing timing indicator,
adjust distributor as listed below
LP
=
24
degrees before top dead center
nG
=
32
degrees before top dead center
note
: Timing values are approved by PSI Engineering.
14. Tighten distributor hold-down clamp.
15. While observing O
2
Analyzer readout, adjust zero
pressure (
a
) and main adjustment (
B
) screws to obtain
stoichiometric value shown in table. Select table value
that corresponds to your O
2
Analyzer display. The
shaded line in table indicates optimum target value.
Voltage
Phi
Lamda
2.40
1.000
1.000
2.45
1.012
0.988
2.50
1.024
0.977
2.55
1.036
0.966
2.60
1.048
0.955
2.65
1.060
0.944
16. Using technician-supplied load, add half load to
generator. Check and adjust (
a
) and (
B
) to achieve
target value.
17. Using technician-supplied load, add full load to
generator. Check and adjust (
a
) and (
B
) to achieve
target value.
18. Remove load and check if sensor value remained
in target area. If needed, adjust (
a
) and (
B
) to achieve
target value.
19. Add half, then full load to generator. Recheck and
verify sensor value remains in target area.
iMPortant
: It may take several attempts to achieve the
target setting. Continue to test and adjust with engine
stabilized at no, half and full loads until target value is
achieved at all generator loads.
20. Remove load from generator. Allow generator to
run for ten minutes to stabilize internal temperatures.
Turn control panel system switch to
off
.
21. Remove 15 Amp fuse from system control panel.
22. Install the ZPR tower cap, remove O
2
sensor, and
timing light.
23. Re-install fuse in system control panel.
24. Set exercise timer.
25. Complete emissions statement and send with
installation checklist.
WarninG
Contact with muffler and engine parts can result in
serious burns.
DO NOT touch hot parts and AVOID hot exhaust gases.
•
Allow equipment to cool before touching.
•
B
A
