Daikin DP14U Series, Installation Instructions Manual

16

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

WARNING

T

O AVOI

D

  PERSONAL  IN

J

URY OR 

D

EAT

H

D

UE TO ELECTRIC  S

H

OC

K

, REMOVE

ELECTRICAL POWER FROM T

H

E  UNIT 

B

EFORE C

H

ANGING SPEE

D

 TAPS  ON T

H

E

B

LOWER  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

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

T1

Fan Only Green

T2

High 

Speed

T4

Low 

Speed

Yellow

T3

Low 

Speed

White

T5

High 

Speed

FAN ONLY

HEATING

COOLING

Single Stage Models

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

SPEED 

TAP

DEFINITI

ON

LEAD 

COLOR

T1

Fan Only Green

T2

Heat

White

T3

Low 

Speed

Purple

T4

High 

Speed

Yellow

T5

High 

Speed Hi-

Static

FAN ONLY

HEATING

COOLING

Two Stage Models:

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.

DIP

SWITCH

1 2 3 4 5 6 7 8

ON

• • • • • • • •

OFF

• • • • • • • •

Factory DIP Switch Settings

Switches

Function

1, 2

Heating Speeds

3

Unused

4

OFF for Two-Stage

5, 6

Cooling Speeds

7, 8

Airflow Adjust

Dip Switch Functions

The blower speed as shipped from the factory should deliver 

the correct airflow. However, if installation conditions require a 

different airflow, the blower speed may be adjusted using the DIP 

switches on the ECM interface module (located in the blower 

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).