Limit Check - Goodman A/GPG13 M SERIES W/R410A Installation & Operating Instructions Manual

6. Turn ON power and close thermostat "R" and "W" contacts
to provide a call for heat.
7. Using a leak detection solution or soap suds, check for
leaks at outlet pressure boss plug (Honeywell valve) or
screw (White-Rodgers valve). Bubbles forming indicate a
leak. SHUT OFF GAS AND REPAIR ALL LEAKS
IMMEDIATELY!
8. Measure the gas manifold pressure with burners firing.
Adjust manifold pressure using the Manifold Gas Pressure
table shown below.
Manifold Gas Pressure
Natural Gas
Propane Gas
9. Remove regulator cover screw from the outlet pressure
regulator and turn screw clockwise to increase pressure
or counterclockwise to decrease pressure. Replace
regulator cover screw.
10.Turn OFF all electrical power and gas supply to the system.
11. Remove the manometer hose from the hose barb fitting
or outlet pressure boss.
12.Replace outlet pressure tap:
a. Honeywell VR8215 valve:
Remove the 1/8" NPT hose barb fitting from the outlet
pressure tap. Replace the outlet pressure boss plug and
seal with a high quality thread sealer.
b. White-Rodgers 36G22 valve: Turn outlet pressure test
screw in to seal pressure port (clockwise, 7 in-lb
minimum).
13.Turn ON electrical power and gas supply to the system.
14.Close thermostat contacts to provide a call for heat.
15.Retest for leaks. If bubbles form, SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
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 34 seconds per cubic foot as determined by Step 2, then:
Input = 1000 x 3600 / 34 = 106,000 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.
3.5" w.c.
10.0" w.c.
14
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 tempera-
ture 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
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.
Refer to the wiring diagram in the appendix to verify speed tap
settings.
For models equipped with PSC type motors, blower speeds
are to be changed at the ignition control board. Both heat
speed and cool speed terminals are supplied on the board
along with two unused motor lead terminals.
Some models are equipped with EEM motors. EEM motors are
constant torque motors with very low power consumption. This
motor is energized by 24V. Adjust the CFM for the unit by changing
the 24V low voltage leads to the speed terminal block on the
motor.
Heating-White Lead
T1 - Low Speed
T2 - Medium Speed
T3 - High Speed
NOTE: Heating airflow must be adjusted to provide the temperature
rise shown on rating plate.

Limit Check

Check limit control operation after 15 minutes of operation by
blocking the return air grille(s).
1. After several minutes the main burners must go OFF.
Blower will continue to run.
2. Remove air restrictions and main burners will relight
after a cool down period of a few minutes.
WARNING
Cooling-Yellow Lead
T4 - Low Speed
T5 - High Speed