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11. Turn off all electrical power and gas supply to the system.
12. Remove manometer hose from outlet pressure boss.
13. Turn outlet pressure test screw in to seal pressure port (clockwise, 7 in-lb minimum).
14. Turn on electrical power and gas supply to the system.
15. Turn on system power and energize valve.
16. Using a leak detection solution or soap suds, check for leaks at pressure boss screw. Bubbles forming indicate a leak. SHUT
OFF GAS AND FIX ALL LEAKS IMMEDIATELY.
NOTE: For Natural gas to LP gas conversion, consult your dealer for appropriate conversion kit(s).
Gas Input (Natural Gas Only) Check
To measure the gas input use a gas meter and proceed as follows:
1. Turn off gas supply to all other appliances except the unit.
2. With the unit operating, time the smallest dial on the meter for one complete revolution. If this is a 2 cubic foot dial, divide
the seconds by 2; if it is a 1 cubic foot dial, use the seconds as is. This gives the seconds per cubic foot of gas being
delivered to the unit.
3. INPUT = GAS HTG VALUE x 3600 / SEC. PER CUBIC FOOT
Example: Natural gas with a heating value of 1000 BTU per cubic foot and 36 seconds per cubic foot as determined by Step 2, then:
Input = 1000 x 3600 / 36 = 100,000 BTU per Hour. NOTE: BTU content of the gas should be obtained from the gas supplier. This
measured input must not be greater than shown on the unit rating plate.
4. Relight all other appliances turned off in step 1. Be sure all pilot burners are operating.
Main Burner Flame Check
Flames should be stable, soft and blue (dust may cause orange tips but they must not be yellow) and extending directly outward
from the burner without curling, floating or lifting off.
Temperature Rise Check
Check the temperature rise through the unit by placing thermometers in supply and return air registers as close to the unit as
possible. Thermometers must not be able to sample temperature directly from the unit heat exchangers, or false readings could be
obtained.
1. All registers must be open; all duct dampers must be in their final (fully or partially open) position and the unit operated for
15 minutes before taking readings.
2. The temperature rise must be within the range specified on the rating plate.
NOTE: Air temperature rise is the temperature difference between supply and return air.
With a properly designed system, the proper amount of
temperature rise will normally be obtained when the unit is
operated at rated input with the recommended blower speed.
If the correct amount of temperature rise is not obtained, it
may be necessary to change the blower speed. A higher blower
speed will lower the temperature rise. A slower blower speed
will increase the temperature rise.
NOTE: Blower speed MUST be set to give the correct air
temperature rise through the unit as marked on the rating plate.
External Static Pressure Check
The total external static pressure must be checked on this unit
to determine if the airflow is proper.
Blower Speed Adjustments
Blower speeds are changed at the indoor blower. The ignition
control
board has four blower speeds: LOW HEAT, HI HEAT, LOW
COOL and HIGH COOL.
NOTE: FAN ONLY energizes at LOW HEAT speed. The GPG16 models
are equipped with EEM motors. EEM motors are constant torque
motors with very low power consumption. This motor is energized
by 24VAC. Adjust the CFM for the unit by changing the 24 VAC
leads to the speed terminal block on the motor.
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK, REMOVE
ELECTRICAL POWER FROM THE UNIT BEFORE CHANGING SPEED TAPS ON THE
BLOWER MOTOR.
HEATING
Speed
Lead
Definition
Tap
Color
Low
T1
White
Speed Heat
High
T2
Brown
Speed Heat
15
WARNING
COOLING
Speed
Lead
Definition
Tap
Color
Low Speed
T3
Purple
Cool
High Speed
T4
Yellow
Cool
High Speed
T5
Cool Hi-Static
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