Generator Tests Under Load; Section 4 - Maintenance; Maintenance Performed By Authorized Service Facilities; Cooling System - Generac Power Systems 004920-0 Owner's Manual

3.12 GENERATOR TESTS UNDER LOAD

1. Set the generator's main circuit breaker to its
OFF or OPEN position.
2. Manually actuate the transfer switch main con-
tacts to their EMERGENCY (STANDBY) position.
Refer to Manual Operation.
3. To start the generator, set the AUTO/OFF/
MANUAL switch to MANUAL. When engine starts,
let it stabilize for a few minutes.
4. Turn the generator's main circuit breaker to its
ON or CLOSED position. The generator now pow-
ers all LOAD circuits. Check generator operation
under load as follows:
• Turn ON electrical loads to the full rated
wattage/amperage capacity of the generator.
DO NOT OVERLOAD.
• With maximum rated load applied, check
voltage and frequency across transfer switch
terminals E1 and E2. Voltage should be
greater than 230 VAC and frequency should
be greater than 59 Hertz.
• Let the generator run under rated load for at
least 30 minutes. With unit running, listen for
unusual noises, vibration, overheating, etc.,
that might indicate a problem.
5. When checkout under load is complete, set main
circuit breaker of the generator to its OFF or
OPEN position.
6. Let the generator run at no-load for several
minutes. Then, shut down by setting the
AUTO/OFF/MANUAL switch to its OFF position.
7. Move the transfer switch's main contacts back to
their UTILITY position. For example, LOAD con-
nected to UTILITY power supply. The handle and
operating lever of the transfer switch should be in
the down position.
8. Turn on the UTILITY power supply to transfer
switch, using whatever means provided (such as
a utility main line circuit breaker). The UTILITY
power source now powers the loads.
9. Set the generator's AUTO/OFF/MANUAL switch to
its AUTO position. The system is now set for fully
automatic operation.
Section 4 — Maintenance
Generac Liquid-cooled 20 kW Generator
4.1 MAINTENANCE PERFORMED BY
AUTHORIZED SERVICE FACILITIES
A. EVERY THREE MONTHS
1. Check battery state of charge and condition.
2. Inspect and test fuel system.
3. Check transfer switch.
4. Inspect exhaust system.
5. Check engine ignition system.
6. Check fan belts.
B. ONCE EVERY SIX MONTHS
1. Test Engine Safety Devices (low oil pressure, low
coolant level, high coolant temperature).
C. ONCE ANNUALLY
1. Test engine governor; adjust or repair, if needed.
2. Clean, inspect generator.
3. Flush cooling system.
D. FIRST 100 OPERATING HOURS
1. Change engine oil and oil filter. (After initial
change, service engine oil and filter at 150 oper-
ating hours or 6 months, whichever comes first.)
2. Retorque cylinder head. (See Torque Specs.)
3. Retorque intake and exhaust manifold. (See
Torque Specs.)
E. EVERY 500 OPERATING HOURS
1. Service air cleaner.
2. Check starter.
3. Check engine DC alternator.
F. EVERY 800 OPERATING HOURS
1. Retorque cylinder head. (See Torque Specs.)
2. Retorque intake and exhaust manifold. (See
Torque Specs.)
3. Check engine compression.
4. Check valve clearance.
4.2

COOLING SYSTEM

Air intake and outlet openings in the generator com-
partment must be open and unobstructed for contin-
ued proper operation. This includes such obstruc-
tions as high grass, weeds, brush, leaves and snow.
Without sufficient cooling and ventilating air flow, the
engine/generator quickly overheats, which causes it
to shut down. (See Section 9 for installation drawings
and vent locations.)
Generac ® Power Systems, Inc. 19