14
(switches 1 and 2) provides airflow adjustment for heating
airflow. The “COOL” adjustment function (switches 5 and 6)
provides airflow adjustments for cooling airflow. The
“ADJUST” function (switches 7 and 8) will adjust the heating
AND cooling a10% or - 15%. The “DELAY” function
(switches 3 and 4) is not field adjustable.
O
N
To adjust the HEAT, COOL or ADJUST functions, simply change
the ON/OFF position of the appropriate dipswitches. The table
below shows the ON/OFF combinations for the various switches
and the corresponding A, B, C, or D taps. Refer to the Product
Data Book applicable to your model for airflow tables and
temperature rise. The “Dipswitch Position” table below shows
the factory dipswitch settings for each model. The “CFM” table
below shows the nominal heating and cooling CFM for each
model.
1
2
3
4
5
6
7
8
A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
B
ON
OFF
ON
OFF
ON
OFF
ON
OFF
C
OFF
ON
OFF
ON
OFF
ON
OFF
ON
D
ON
ON
ON
ON
ON
ON
ON*
ON*
‡ Factory Set; not field adjustable
* Tap D has no effect on airflow
ADJUST
HEAT
DELAY‡
COOL
Dipswitch Settings and Corresponding Tap
1
2
3
4
5
6
7
8
GPG13480701*
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
GPG13480901*
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
GPG13481151*
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
GPG13600901*
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
GPG13601151*
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
GPG13601401*
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
HEAT
COOL
GPG13480701*
1020
1540
GPG13480901*
1140
1540
GPG13481151*
1420
1540
GPG13600901*
1140
1810
GPG13601151*
1420
1810
GPG13601401*
1700
1810
Model
DIP SWITCH POSITION
Model
CFM
Unit dipswitches are factory set for each model, see label on
blower housing for CFM adjustment next to low voltage terminal
connections.
NOTE:
Heating airflow must be adjusted to provide the tempera-
ture rise shown on rating plate.
*PG1360***1A ONLY:
Low stage airflow is approximately 75%
of high stage cooling airflow.
Example:
High stage cooling
airflow is 1800 CFM. Low stage cooling airflow is 0.75*1800
CFM = 1350 CFM.
The adjustment factors for the ADJUST function are A = 1, B =
1.10 (+10%) and C = 0.85 (-15%). The D tap for the ADJUST
function has no effect on airflow.
Example:
Airflow tables
indicate 1425 CFM. With the ADJUST set to B tap, the CFM
becomes 1.10*1425 CFM = 1568 CFM.
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 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
WARNING
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.
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.
*PG13(48, 60)***1B, 3A, 4A models are equipped with X-13
motors. X-13 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
Cooling-Yellow Lead
T1 - Low Speed
T4 - Low Speed
T2 - Medium Speed
T5 - High Speed
T3 - High Speed
*PG13(48, 60)***1A models are equipped with GE ECM
motors. These motors offer greater airflow flexibility as well
as dehumidification. The airflow delivery for these models
can be adjusted by changing the position of dip switches on
a low voltage terminal board. The figure below shows the
dipswitch layout on the low voltage terminal board as well as
the function of each set of switches. The “HEAT” function
