Rating The Furnace - Goodman GSM Installation & Operating Instructions Manual

THERMOSTAT INSTALLATION:
Install the thermostat in accordance with t h e instructions accompanying the thermostat. Run the
thermostat wires into the control compartment in the furnace. Connect the thermostat wiring as shown
on the wiring diagram. The thermostat wiring should be a minimum of 18 gauge. Adhere to
recommended color code to facilitate future troubleshooting. The thermostat should be located near
the return air grille or opening. It should be approximately 5 feet from the floor level.
Never locate the thermostat where it will be influenced by heat generated from hot water pipes, lamps,
televisions, direct sunlight, supply air registers, etc.
Interconnecting wiring must be secured and protected from damage or disconnection. The use of
solderless connectors or equivalent is recommended.
The low voltage control wiring exiting the furnace is labeled "thermostat wiring".
SETTING THE HEAT ANTICIPATOR
The following method should be used in measuring the amp draw of the control circuit to assure
proper adjustment of the thermostat heat anticipator.
Wrap the ''R'' leg around a
clip-on amp meter 10 times.
Energize the furnace in the
heat mode. Record the reading.
Divide this reading by 10.
Set the heat anticipator on the
thermostat to match this reading.
EXAMPLE:
If the reading on the amp meter is
''4'', divide this by 10.
The anticipator setting
will be .4 amps.
This furnace is shipped from the factory equipped for use with natural gas. The following instructions
are for use with natural gas at altitudes up to 2,000 feet. Should this appliance be converted to L.P.,
refer to the instructions included in the factory authorized L.P. conversion kit LPM-03 (GSM) or LPM-
04 (GSMS). If for use at altitudes in excess of 2,000 feet refer to the instructions included in the
factory authorized high altitude kit (HA-02).
It is important to check and adjust the input rate of the furnace to prevent an overfiring situation.
Overfiring can cause premature heat exchanger failure. The input is controlled by the supply pressure,
orifice size, manifold pressure and heating (calorific) value of the gas. The furnace is supplied with
orifices sized for altitudes up to 2,000 feet using a heating value of approximately 1,000 Btu/hr and
should not normally require change.
IO-176
CONTROL VOLTAGE CONNECTIONS
R
R

RATING THE FURNACE

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