Goodman GSM Installation & Operating Instructions Manual page 22

INPUT BTU/H
60,000
80,000
100,000
The temperature difference between the outlet air and the inlet air of the furnace is known as the
temperature rise. This furnace is designed to operate within the temperature rise displayed on the
furnace series and rating plate. To ensure satisfactory performance, the temperature rise of the
furnace must be measured and adjusted, if necessary. Use the following procedure to measure and
adjust the temperature rise;
• Prior to starting the furnace, visually inspect all joints and seams in the supply and return air ducts
for leaks. Repair them if necessary.
• Adjust the room thermostat to obtain constant operation.
• Allow the furnace to operate for at least fifteen (15) minutes.
• With an accurate thermometer measure the temperature at the return air grille. If a combination
indoor / outdoor system is used, the temperature must be measured downstream of the connection.
• Measure the outlet air tempreture at a point approximately twelve to eighteen (12 -18) inches above
the furnace. It may be necessary to measure the outlet air at several places to obtain an accurate
average. NOTE: IF AN AIR CONDITIONING COIL IS INSTALLED, TAKE CARE SO AS NOT TO
DAMAGE THAT COIL.
• Adjust the temperature by changing circulating air blower speed tap.
The circulating air blower is equipped with sleeve bearings which are permanently lubricated by the
motor manufacturer and require no lubrication. At the time of the monthly filter inspection clean the
exterior of the circulating air motor, especially around the perimeter air holes to prevent the possibility
of overheating due to an accumulation of dust or dirt on the windings and motor casing. As suggested
elsewhere in these instructions, the air filters should be kept clean. Dirty filters will restrict the air flow
over the motor windings and possibly cause an overheating condition.
The venter motor has bearings which are prelubricated by the motor manufacturer and require no
attention.
• DO keep the circulating air filters clean. The heating system will operate more efficiently and
economically.
• DO arrange drapes and furniture so that the supply air registers and return air grilles are
unobstructed.
• DO close doors and windows. This will reduce the heat load on the system.
• DO avoid excessive use of bathroom and kitchen exhaust fans.
• DO NOT let heat generated by televisions, lamps, direct sunlight, etc. to influence the thermostat
operation.
• Exclusive of the mounting platform, keep all combustible materials at least three (3) feet from the
furnace.
• DO NOT use the furnace room as a storage area.
• DO NOT store gasoline or other flammable liquids or vapors in the vicinity of the furnace.
IO-176
MINIMUM FILTER SIZES
FILTER SIZE
240 IN
320 IN
363 IN
TEMPERATURE RISE
MOTOR LUBRICATION AND MAINTENANCE
SERVICE INSTRUCTIONS
2
/ 480
2
/ 640
2
/ 727
22
TYPE
PERM. / DISPOSABLE
PERM. / DISPOSABLE
PERM. / DISPOSABLE