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22 Generac
®
Power Systems, Inc.
3.1 BEFORE INITIAL START-UP
Before starting, complete the following:
1. Set the generator's Auto/Off/Manual switch to the
OFF position.
2. Turn OFF the utility power supply to the transfer
switch using the means provided (such as the
utility main line circuit breaker).
3. Check the engine crankcase oil level and, if neces-
sary, fill to the dipstick FULL mark with the rec-
ommended oil. Do not fill above the FULL mark.
4. Check the fuel supply. Gaseous fuel lines must
have been properly purged and leak tested in
accordance with applicable fuel-gas codes. All
fuel shutoff valves in the fuel supply lines must
be open.
Never operate the engine with the oil level
below the “Add” mark on the dipstick. Doing
this could damage the engine.
3.2 CHECK TRANSFER
SWITCH OPERATION
Refer to Section 2.4 (Page 19) for manual operation
procedures.
Do not attempt manual transfer switch
operation until all power voltage supplies to
the transfer switch have been positively turned
off. Failure to turn off all power voltage
supplies will result in extremely hazardous
and possibly fatal electrical shock.
3.3 ELECTRICAL CHECKS
Complete electrical checks as follows:
1. Turn on the utility power supply to the transfer
switch using the means provided (such as a utili-
ty main line circuit breaker).
The transfer switch is now electrically “hot.”
Contact with “hot” parts will result in extremely
hazardous and possibly fatal electrical shock.
Proceed with caution.
2. Use an accurate AC voltmeter to check utility
power source voltage across terminals N1 and
N2. Nominal line-to-line voltage should be 240
volts AC.
3. Check utility power source voltage across termi-
nals N1 and the transfer switch neutral lug; then
across terminal N2 and neutral. Nominal line-to-
neutral voltage should be 120 volts AC.
4. When certain that utility supply voltage is com-
patible with transfer switch and load circuit rat-
ings, turn OFF the utility power supply to the
transfer switch.
5. Set the generator's main circuit breaker to its
OFF (or open) position. Initial tests will be con-
ducted at no-load condition.
6. On the generator panel, set the Auto/Off/Manual
switch to MANUAL. The engine should crank
and start.
7. Let the engine warm up for about five minutes to
allow internal temperatures to stabilize. Then, set
the generator’s main circuit breaker to its ON (or
closed) position.
Proceed with caution! Generator power voltage
is now supplied to the transfer switch. Contact
with live transfer switch parts will result in
dangerous and possibly fatal electrical shock.
8. Connect an accurate AC voltmeter and an AC fre-
quency meter across transfer switch terminal
lugs E1 and E2. Voltage should be 242-252 volts;
frequency should read about 61-63 Hertz.
9. Connect the AC voltmeter test leads across termi-
nal lug E1 and neutral; then across E2 and neu-
tral. In both cases, voltage reading should be 121-
126 volts AC.
10. Set the generator’s main circuit breaker to its
OFF (or open) position. Let the engine run at no-
load for a few minutes to stabilize internal engine
generator temperatures.
11. Set the generator's Auto/Off/Manual switch to
OFF. The engine should shut down.
NOTE:
It is important that you DO NOT proceed until you
are certain that generator AC voltage and frequen-
cy are correct and within the stated limits.
Generally, if both AC frequency and voltage are
high or low, the engine governor requires adjust-
ment. If frequency is correct, but voltage is high or
low, the generator’s voltage regulator requires
adjustment.
3.4 GENERATOR TESTS UNDER LOAD
To test the generator set with electrical loads applied,
proceed as follows:
1. Set generator’s main circuit breaker to its OFF
(or open) position.
2. Set the generator's Auto/Off/Manual switch
to OFF.
3. Turn OFF the utility power supply to the transfer
switch, using the means provided (such as a util-
ity main line circuit breaker).
Section 3 — Post-installation Start-up Adjustments
Guardian Air-cooled Generators