IOM GMI 2M & 2ML Nov 2010.doc
33
♦
Insufficient gas pressure
♦
Unit out of adjustment
♦
Insufficient draft
♦
Check gas pressure at the inlet test port of the
first safety shut off valve. It should be within
the specified 8”-14” wc range. Adjust the
pressure regulator to obtain the required
pressure. If problem persists, replace the valve.
Repeat process for the second safety shut off
valve.
♦
Check the gas manifold pressure to ensure it
complies with the value given in the factory test
report. If required, re-adjust the boiler/water
(see factory test report for the adjustment
values).
♦
Check the vent system to ensure it is not
clogged.
♦
Unit fails at frequent
intervals (excessive
cycling)
♦
Maximum operating (alarm)
temperature is set too low.
♦
Break in controls wiring.
♦
Unit is over-sized
♦
Check the setting on the maximum operating
temperature switch to ensure it is set at the
maximum design temperature.
♦
If applicable, check the differential adjustment
on the maximum operating temperature switch.
♦
Check all connections to and from the wiring
block located immediately below the blower.
♦
Check the maximum heat requirement with the
engineer and ensure the unit is of the
appropriate size.
♦
Unclean combustion
♦
Insufficient air in the
mechanical room
♦
Unit out of adjustment
♦
Check all the louvers and air openings in the
mechanical room to ensure they are free of any
obstructions and there is sufficient inflow of
fresh air into the room.
♦
Using a gas analyzer re-adjust the air and gas
settings.
♦
Air bubble sound in
the unit.
♦
Poor water circulation in one
or both coils
♦
Foreign material in one or
both coils.
♦
Steam pockets in one or both
coils.
♦
Completely purge each coil.
♦
Drain each coil with pressurized air and re-
purge.
♦
Check water flow rate in each coil to ensure it
complies with the required minimum flow rate
(20 GPM).
♦
Gas Odor
♦
Leak in piping.
♦
Exhaust gas leakage
♦
Using a gas detector, check all the connections
(inlet and outlet) of all instruments on the gas
line. Repair as required.
♦
Check the vent system to ensure there are no
cracks or other openings (holes cut for insertion
of thermocouples during the start-up). Repair if
required.
Содержание GMI 2M
Страница 6: ...IOM GMI 2M 2ML Nov 2010 doc 6 SECTION 1 INTRODUCTION...
Страница 13: ...IOM GMI 2M 2ML Nov 2010 doc 13 SECTION 2 INSTALLATION...
Страница 22: ...IOM GMI 2M 2ML Nov 2010 doc 22 SECTION 3 OPERATION...
Страница 30: ...IOM GMI 2M 2ML Nov 2010 doc 30 SECTION 4 MAINTENANCE...
Страница 34: ...IOM GMI 2M 2ML Nov 2010 doc 34...
Страница 35: ...IOM GMI 2M 2ML Nov 2010 doc 35 START UP REPORT...