Daikin DP14U Series, Installation Instructions Manual

10

Electrical Wiring

Thermostat Location

Mount the thermostat approximately five feet above the floor, in 

an area that has an inside, vibration-free wall  and has good air 

circulation.
Movement of air must not be obstructed by furniture, door, 

draperies, etc. The thermostat must not be mounted where it will 

be affected by drafts, hot or cold water pipes or air ducts in walls, 

radiant heat from fireplace, lamps, the sun, television, etc. Consult 

the Instruction Sheet packaged with thermostat for mounting 

instructions.

NOTE: 

All units have one stage of heating and either one or 

two stages of mechanical cooling. If the unit has two stages of 

mechanical cooling, the thermostat must also be two stage. Refer 

to figures later in this section for wiring.

WARNING

TO AVOID PERSONAL INJURY, ELECTRICAL SHOCK OR DEATH, 

DISCONNECT ELECTRICAL POWER BEFORE SERVICING OR 

CHANGING ANY ELECTRICAL WIRING.

The units are designed for operation on 60 hertz current and at 

voltages as shown on the rating plate. All internal wiring in the 

unit is complete. It is necessary to bring in the power supply to the 

contactor as shown on the unit wiring diagram which is supplied 

with each unit. The low voltage wiring must be connected between 

the unit control panel and the room thermostat.

R

C

G

W

Y

THERMOSTAT

RD

BL

GR WH YL YL

1 STAGE COOLING - 1 PHASE POWER

R

C

G

W

Y

THERMOSTAT

RD

BL

GR WH YL YL PU

1 STAGE COOLING - 3 PHASE POWER

NO ECONOMIZER

R

C

G

RD

BL

GR WH

W1 W2

Y1

Y2

YL YL

PU

PU

THERMOSTAT

2 STAGE COOLING - 1 PHASE POWER

R

C

G

RD

BL

WH

W1 W2

Y1

Y2

YL YL

PU

PU

THERMOSTAT

YL

GRGR

2 STAGE COOLING - 3 PHASE POWER

WIRING LEGEND

FACTORY WIRING

FIELD WIRING

WIRE NUT CONNECTION

RD

BL

WH

YL PU

1 STAGE COOLING - 3 PHASE POWER

WITH ECONOMIZER

R

C

G

W1 W2

Y1

Y2

THERMOSTAT

GRGR

YL

1

2

1

WIRE CONNECTS TO PCBBL216 J5 PLM PIN 5

2

WIRE CONNECTS TO ECONOMIZER PLF PIN 2

24 Volt Dehumidistat Wiring (For DP16UM* Only)

The optional usage of a dehumidistat allows the unit’s circulator 

blower to operate at a slightly lower speed (approximately 80% 

of desired cooling speed) during a combined thermostat call for 

cooling and dehumidistat call for dehumidification. This can be 

done through an independent dehumidistat. This lower blower 

speed enhances dehumidification of the conditioned air as it 

passes through the air conditioning coil. For proper function, a 

dehumidistat applied to this package unit must operate on 24 VAC 

and utilize a switch which opens on humidity rise. Refer to the unit 

wiring diagram for additional wiring details.
To install/connect a dehumidistat:

1.  Turn OFF power to unit.

WARNING

HIGH VOLTAGE

DISCONNECT ALL POWER BEFORE SERVICING 

OR INSTALLING THIS UNIT. MULTIPLE POWER 

SOURCES MAY BE PRESENT. FAILURE TO DO SO 

MAY CAUSE PROPERTY DAMAGE, PERSONAL 

INJURY OR DEATH.

2.  To enable the dehumidify function, locate the ECM blower 

motor interface module in the unit’s blower section.  Locate 

the jumper labeled “HUM” on the interface module.  Cut the 

jumper to enable dehumidification (see ECM Blower Motor 

Interface Module).

3.  Connect “R” to the common side of the Dehumidistat (close 

on humidity rise).

4.  Connect the N/O (normally open) side of the Dehumidistat to 

the HUM terminal on PCBEM103 ECM control board. 

5.  Turn ON power to unit.

Once the HUM jumper is cut at the ECM motor interface module, 

the dehumidify function is enabled during a combination call for 

cooling (T-Stat) and  dehumidification (DEHUMStat).

5

Y1

1

SW

IT

CH

8

7

6

5

4

3

2

1

W1

OT1

OT2

HUM

PJ6

PJ2

PJ4

W2

CR9

HEATER

W1

W2

C

R

24 VAC

CR8 
CR7 
CR6

J3

CR5

C2

4

1

J2

CR2

DS

1

CR1

R5

O

FF

O

N

D

IP

E

F1 

3A

M P

KESU

CR

1 0

R3

PN. PCB001 02

(CFM)

CONFIGURATION.

DIP SWITCH

FOR PROPER

TO MANUAL

PLEASE REFER

R1

R2

ED

W2

O

COM

YCON

R

HEATPUMP

CONDENSER

OUTDOOR

THERMOSTATS

HUMIDISTAT

HUM

Y/Y2

G

Y1

R

C

OT2

OT1

OTC

O

W/W2

E\W1

J1

HUM

PJ6

EMC Blower Motor Interface Module