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External Static Pressure Check
The total external static pressure must be checked on this unit to
determine if the airflow is proper.
1.
Using a digital manometer measure the static pressure of
the return duct at the inlet of the unit, (Negative Pressure).
Total External Static
2.
Measure the static pressure of the supply duct, (Positive
Pressure).
3.
Add the two readings together.
NOTE: Both readings may be taken simultaneously and read
directly on the manometer is so desired.
4.
Consult proper table for quantity of air.
If the external static pressure exceeds the minimum or maximum
allowable statics, check for closed dampers, dirty filters,
undersized or poorly laid out ductwork.
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.
EEM Motors
NOTE: Refer to the wiring diagram in the appendix to verify speed
tap settings.
DP14UM 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
FAN ONLY
SPEED
DEFINITI
LEAD
SPEED
TAP
ON
COLOR
TAP
T1
Fan Only
Green
T2
T3
Single Stage Models
WARNING
HEATING
COOLING
DEFINITI
LEAD
SPEED
DEFINITI
ON
COLOR
TAP
ON
High
Low
T4
Speed
Speed
Low
High
White
T5
Speed
Speed
FAN ONLY
SPEED
DEFINITI
LEAD
TAP
ON
COLOR
T1
Fan Only
Green
NOTE: Heating airflow must be adjusted to provide the
temperature rise shown on rating plate.
ECM Motors
The DP16UM models are equipped with ECM circulating blower
motors. ECM circulating blower motors are constant airflow
motors with very low power consumption. The ECM motor is
controlled by 24VAC signals passed from an ECM interface
module.
Thermostat leads when wired as per wiring diagram in appendix
provides four blower speed outputs: FAN ONLY, HEAT, HI COOL
and LOW COOL. These are 24VAC outputs and are passed to the
ECM interface module. Depending on applied thermostat inputs,
the ignition control will energize the appropriate blower speed
output with 24VAC. This signal is passed to the ECM interface
module, which in turn passes the signal to the ECM motor. The
ECM motor then operates at the correct speed, delivering the
appropriate airflow.
NOTE: FAN ONLY blower speed is approximately 75% of the
HIGH COOL speed.
ON
OFF
The blower speed as shipped from the factory should deliver
the correct airflow. However, if installation conditions require a
LEAD
different airflow, the blower speed may be adjusted using the DIP
COLOR
switches on the ECM interface module (located in the blower
Yellow
compartment. Use the following figure and the airflow tables in the
Appendix to set the desired blower speed.
NOTE: Heating airflow must be adjusted to provide the temperature
rise shown on rating plate. Blower speeds are programmed to
deliver adequate airflow at rated external static pressure (ESP).
Refer to airflow table provided in the Appendix for details.
Limit Check
Check limit control operation after 15 minutes of operation by
blocking the return air grille(s).
16
HEATING
SPEED
DEFINITI
LEAD
TAP
ON
COLOR
T2
Heat
White
Two Stage Models:
DIP
SWITCH
1
2
3
4
5
6
• • • • • • • •
• • • • • • • •
Factory DIP Switch Settings
Switches
Function
1, 2
Hea ti ng Speeds
3
Unus ed
4
OFF for Two-Sta ge
5, 6
Cool i ng Speeds
7, 8
Ai rfl ow Adjus t
Dip Switch Functions
COOLING
SPEED
DEFINITI
LEAD
TAP
ON
COLOR
Low
T3
Purple
Speed
High
T4
Yellow
Speed
High
T5
Speed Hi-
Static
8
7
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