Generator Tests Under Load; Checking Automatic Operation; Adjusting The Regulator (Natural Gas Only) - Bryant ASPAS1BBA007 Parts, Adjustment And Maintenance Manual

1.4

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. Turn OFF all loads connected to the transfer switch
terminals T1 and T2.
3. Set the generator's AUTO/OFF/MANUAL switch to
OFF.
4. Turn OFF the utility power supply to the transfer
switch, using the means provided (such as a utility
main line circuit breaker).
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.
5. Manually set the transfer switch to the STANDBY
position, i.e., load terminals connected to the
generator's E1/E2 terminals. The transfer switch
operating lever should be down.
6. Set the generator's AUTO/OFF/MANUAL switch to
MANUAL. The engine should crank and start
immediately.
7. Let the engine stabilize and warm up for a few
minutes.
8. Set the generator's main circuit breaker to its ON (or
closed) position. Loads are now powered by the
standby generator.
9. Turn ON electrical loads connected to transfer switch
T1 and T2. Apply an electrical load equal to the full
rated wattage/amperage capacity of the installed
generator.
10. Connect an accurate AC voltmeter and a frequency
meter across terminal lugs E1 and E2. Voltage
should be greater than 230 volts; frequency should
be greater than 58 Hertz.
11. Let the generator run at full rated load for 20-30
minutes. Listen for unusual noises, vibration or other
indications of abnormal operation. Check for oil
leaks, evidence of overheating, etc.
12. When testing under load is complete, turn OFF
electrical loads.
13. Set the generator's main circuit breaker to its OFF (or
OPEN) position.
14. Let the engine run at no-load for a few minutes.
15. Set the AUTO/OFF/MANUAL switch to OFF. The
engine should shut down.
Section 1 — Post Installation Start-up and Adjustments
Bryant Air-cooled 7 kW, 12 kW and 15 kW Generators
1.5 CHECKING AUTOMATIC
OPERATION
To check the system for proper automatic operation,
proceed as follows:
1. Set generator's main circuit breaker to its OFF (or
OPEN) position.
2. Check that the AUTO/OFF/MANUAL switch is set to
OFF.
3. Turn OFF the utility power supply to the transfer
switch, using means provided (such as a utility main
line circuit breaker).
4. Manually set the transfer switch to the UTILITY
position, i.e., load terminals connected to the utility
power source side.
5. Turn ON the utility power supply to the transfer
switch, using the means provided (such as a utility
main line circuit breaker).
6. Set the AUTO/OFF/MANUAL switch to AUTO. The
system is now ready for automatic operation.
7. Turn OFF the utility power supply to the transfer
switch.
With the AUTO/OFF/MANUAL switch at AUTO, the
engine should crank and start when the utility source
power is turned OFF. After starting, the transfer switch
should connect load circuits to the standby side. Let the
system go through its entire automatic sequence of
operation.
With the generator running and loads powered by
generator AC output, turn ON the utility power supply to
the transfer switch. The following should occur:
• After about six seconds, the switch should transfer
loads back to the utility power source.
• About one minute after retransfer, the engine should
shut down.
1.6 ADJUSTING THE REGULATOR
(NATURAL GAS ONLY)
Although the generator has been factory set to provide
maximum power, it may be necessary in some areas to
adjust this setting. Because natural gas has different BTU
or power content across the country the engine may not
perform as designed.
If experiencing engine problems at high or full load
conditions follow these steps. It will require a frequency
meter to perform this procedure.
1. Turn off utility power to the main distribution panel in
the house. This can be done by switching the service
main breaker to the off or open position.
2. Allow the generator to start. Before loading the
generator, confirm that the No Load Frequency, with
the top open and front panel off, is set to 63-63.5 Hz.
Transfer load to emergency circuits.
Bryant 5