CARRIER Package Units(both Units Combined) Manual L0709352

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Wall Thermostat Interface Retrofit Kit Accessory For
Packaged Terminal Air Conditioner
or Heat Pump

Cancels: IlK 84-07-7

Installation
SAFETY

Instructions

CONSIDERATIONS

INTRODUCTION

Only trained, qualified personnel and service mechanics
should install electrical accessories on packaged terminal air
conditioners or heat pumps.

PACKAGE

CONTENTS

ITEM

QUANTITY

Wall Thermostat Interface Assembly (Including
Control Board, Control Box Door and Knob)
Indoor Coil Freeze Thermostat Clip
Control Panel Label
Wire Ties

1
1
1
2

These instructions cover the installation of the Wall Thermostat Interface Retrofit Kit accessory with Indoor Coil Freeze
Therlnostat (IFT) to be installed on packaged temtinal air conditioner (PTAC) products. See Fig. 1. Indoor coil fieeze thermostat protection prevents the indoor coil fiom freezing.
The Wall Thermostat Interface Retrofit Kit allows PTAC
units to be controlled from a remote thermostat (purchased
sep_u'ately).

INSTALLATION

CONTROLPANEL
LABEL

Disconnect all power to unit to avoid possible electrical
shock during inst_dlation.
Prepare

WIRE
TIES

INDOOR COIL
THERMOSTAT

FREEZE
CLIP

IlK 84-07-13
9/1/04

CONTROL

Unit

I.

Check to be
disconnected.

2.

Remove front panel frt)m the unit by grasping the panel
firmly near the bottom of both sides, then pulling panel
forward and upward to release magnetic latches and p_u'tition hooks.

KNOB

Remove

sure unit

Existing

is off and

Control

power

to unit

is

Box

1. Relnove power cord access cover and save screw. See
Fig. 2.
2. Remove control knobs and save one for inst_dlation later
3.

4.

Open control box by removing the 2 control box cover
screws shown in Fig. 2 and swing the cover down to
open. Save the screws.
Disconnect the power cord by removing the ribbed/white
wire at the capacitor (C) terminal, the plain/black wire
from the rotguy switch at terminal LI, and both power
cord and chassis ground wires from ground screw. See
Fig. 3 and 4.
Remove wire ties, making sum not to damage the wires,
and discard. Remove the power cord and save.

WALL
THERMOSTAT
INTERFACE
ASSEMBLY

_INDOOR

5.

COILFREEZE

SENSOR

NOTE: Wiring schematic for the Wall Thermostat Interface
Retrofit Kit is located in plastic bag on front of control box
door

Fig. 1 -- Wall Thermostat Interface Retrofit Kit
Package Contents

Manufacturer

reserves the right to discontinue,
PC 132

or change

Catalog No. 535-20065

at any time, specifications
Printed in U.S.A.

or designs without notice and without incurring obligations.
Form 52C,P-36SI

Pg 1

9-04

Replaces:

52C,P-3081

CONTROL
BOX COVER
SCREWS

•

POWER
CORD
ACCESS
COVER
OUTDOOR

THERMOSTAT
(OFT)
MOUNTING
SCREWS

CORD

Fig. 2 -- Control

Box Component

Location

Select Unit -- Refer to the installation

instructions for the
unit being retrofit. For Cooling with Electric Heat units see
below. For Heat Pump units see page 3. For Cooling Only units
see page 5.
COOLING WITH ELECTRIC HEAT UNITS
1. Remove the following wires from the rotary switch:
a. Yellow wire from COME
b. Red fan motor wire from LO, and the black fan motor
wire from HI.
c. Pink wire from L2.
d. Red wire from LS.
e. Violet heater wire from HT.
2. Remove the control box door and thermostat bulb from
front of coil and discard.
3. Reinstall the previously saved power cord access cover to
the new control box door supplied with kit.
4. Attach the new control box door by sliding it onto the
control box hinge pins. See Fig. 5.
5. Secure power cord, control board and chassis ground
wiles to control box door
6. Attach ribbed/white wire (L2) from power cord to temfinal C on capacitol: See Fig. 4.
7. Reconnect
the following wires on control board (see
Fig. 6):
a. Plain/black wire (LI) from power cord to LI (brass
post terminal) on lelay K2.
b. Pink wire to L2 on relay K2AI.
c. Violet heater wire to Heat2 on lelay K2AI.

OUTDOOR
COIL
FREEZE THERMOSTAT
(OFT)
RIBBED/WHITE
TO CAPACITOR
WIRE TIE
WIRE TIE

_/

GROUND

PLAIN/BLACK
TO ROTARY

SCREW

(GND)

WIRE
(C)

WIRE
SWITCH

(L2)

(L1)

RED

YELLOW_

PINK

BLACK

BLACK

_

INDOOR

_

THERMOSTAT

Fig. 3 i

=

ROTARY

SWITCH

_

Typical Control
(Heat Pump

Wiring -- Standard
Unit Shown)

Units

NOTE: The male piggy back terminal is not used.
This termimd may either be removed or pinched back
to fit the connector onto Heat2 relay terminal.
d. Red heater wire to Heatl on relay K2.
e. Yellow compressor wire to COME on relay KI.
8. Attach the Red fan motor wire to termimd 1 on fan speed
selector switch (FSS) and the Black fan motor wile to terminal 3 on FSS. See Fig. 6.
9. Dress wiles using wire ties provided. See Fig. 7.
10. Close the control box door and secure by re-attaching
screws saved earliel:
11. Attach control knob that was removed earliel: to fan
speed selector switch.
12. Install Indoor Coil Freeze Thermostat (IFT) into coil.
a.

b.

Use a pen to m_ke an opening in the fins to install
freeze sensor (Fig. 8).
• For 7000 Btuh and 9000 Btuh units, make an opening 4-in. fiom the right side of the coil between the
third and fourth row from the top.
• For 12,000 Btuh and 15,000 Btuh units, make an
opening 4-in. from the right side of the coil
between the second and third row fiom the top.
Route Indoor Coil Freeze Sensor:

• Remove disch;uge deck. See Fig. 8.
• Route fieeze sensor fiom PC board through plastic
bushing in side panel with electric heater wiles. See
Fig. 7.
• Push sensor through hole in fi_)nt flange above the
_uting plate. See Fig. 9.
• Re-install discharge deck.
c. Push freeze sensor into opening made in Step 12a.
d. Bend clip on scored line and install in fins (the curved
notches will lock clips in place) next to sensor to hold
sensor in place in the coil. See Fig. 10.
13. Replace front panel.
14. Install control panel label on front of control panel, under
door. to cover hole left by removal of control knob.
15. Restore power to unit.

HEAT PUMP UNITS

WIRE
(L2)

Fig. 4 -- Capacitor

Wiring

ATTACHMENT
HINGE PINS

ATTACHMENT
NOTCHES
_

ON DOOR

(
[/'7--"-"_

%_

BOX --__J /

_,

/

/l

\ _-.

/

Fig. 5 -- Attaching Control Door to PTAC Unit

1. Remove the two mounting screws on the Outdoor Coil
Freeze Thermostat (OFT) and save. See Fig. 3.
2. Remove the blue wile from terminal 1 of the OFT. Be
sure to re-attach the red wire (that was piggy backed to
the blue wire) back on to terminal 1 of file OFT.
3. Remove the black wile from terminal 2 on the OFT.
NOTE: The OFT will remain attached to the unit by a
capillary tube along with red and yellow wires. The
OFT will be reinstalled on the retrofit control box door
latec
4. Carefully move the OFT offto the side, taking care not to
damage the capillmy tube or wires.
5. Remove the following wiles from the rotary switch:
a. Red fan motor wire from LO, and the black fan motor
wire from HI.
b. Pink wire from L2.
c. Violet heater wire and black revel.sing valve wile
from HT terminal on rotary switch and separate.
d. Remove other black reversing v_dvewire from indoor
thermostat termimd 1 (ITI).
6. Remove the control box door and thermostat bulb from
front of coil and discard.
7. Reinstall the previously saved power cord access cover to
file new control box door supplied with kit.
8. Attach the new control box door by sliding it onto the
control box hinge pins. See Fig. 5.
9. Secure power cord, control bomd and chassis ground
wires to control box dool:
10. Attach ribbed/white wire (L2) from power cord to terminal C on capacitol: See Fig. 4.
11. Reconnect the following wires on control board (see
Fig. 6):
a. Plain/black wire (LI) fiom power cord to LI (brass
post terminal) on relay K2.
b. Pink wire to L2 (brass post terminal) on relay K2AI.
c. Violet heater wire to Heat2 on relay K2AI.
NOTE: The male piggyback terminal is not used.
Either remove or pinch it back in order to fit connector onto Heat2 on relay K2AI.
d. One of the 2 black reversing valve wires to RVS (no
polarity).
e. Remaining black reversing valve wire to L2 (brass
post terminal) on relay K2AI.
NOTE: Black reversing valve wires me molded
together in a 2-wire bundle.
12. Attach md fan motor wire to terminal 1 on Fan Speed
Selector switch (FSS) and the black fan motor wire to terminal 3 on FSS. (See Fig. 6.)
13. Attach md wire from Heatl on relay K2 to terminal 2 of
OFT. See Fig. 11.
14. Attach yellow wire fiom COMP of relay KI (with piggy
back male terlninal) to yellow wire already attached to
terminal 3 of OFT. Attach both wires back on terminal 3
of OFT. See Fig. 11.
15. Remount the OFT to the new door with the original
screws and in same position and orientation.
16. Dress wires using wire ties provided. See Fig. 7.
17. Close the control box door and secure by re-attaching
screws saved earliec
18. Attach control knob that was removed earlier, to fan
speed selector switch.

VIOLET

(HEAT2

ON

PLAIN/BLACK
(L1 ON K2)

K2A1)

POWER

CORD

RED WIRE
PINK

(L2 ON K2A1)

POWER

(H EATI_,_,//

CORD

YELLOW

/

WIRE

//
RED

WIRE

(TERMINAL
ON FSS)
POWER
ACCESS

CORD

/
BLACK

POWER
CORD
ACCESS
COVER
ATTACHMENT
SCREW

FAN

1

WIRE

SPEED

SELECTOR

SWITCH

(FSS)

//
THERMOSTAT
INTERFACE
CONTROL
BOARD

#
Fig. 6 -- Typical

Wall Thermostat

Interface

Board Terminal

BUSHING

/ ELECTRIC
WIRES

HEATER

Connections

Control

Board Shown)

19. Install Indoor Coil Freeze Thermostat (Ibm) into coil.
a. Use a pen to make an opening in the fins to install
freeze sensor (Fig. 8).
• For 7000 Btuh and 9000 Btuh units, make an opening 4-in. from the right side of the coil between the
third and fourth row from the top.

b.

IFT COIL
SENSOR

(Heat/Cool

• For 12,000 Btuh and 15,000 Btuh units, make an
opening 4-in. from file right side of file coil
between the second and third row from the top.
Route Indoor Coil Freeze Sensor:
• Remove dischtuge

WIRE
TIE

deck. See Fig. 8.

• Route freeze sensor from PC board through plastic
bushing in side panel with electric heater wiles. See
Fig. 7.

TIE

• Push sensor through hole in fiont flange above the
rating plate. See Fig. 9.
OUTDOOR COIL FREEZE
THERMOSTAT
(OFT)

Fig. 7 -- Completed Assembly
(Heat Pump Unit Shown)

c.
d.

• Re-install discharge deck.
Push fieeze sensor into opening made in Step 12a.
Bend clip on scored line and install in fins (the curved
notches will lock clips in place) next to sensor to hold
sensor in place in the coil. See Fig. 10.

20. Replace fiont panel.
21. Install control panel label on fiont of control panel, under
door, to cover hole left by removal of control knob.
22. Restore power to unit.

DISCHARGE

DECK

Fig. 8 -- Location of Indoor Coil Freeze
Thermostat (IFT) on Typical Unit

COOLING

FRONT FLANGE

RATINGPLATE
Fig. 9 -- Location of Indoor
Thermostat
(IFT) with Discharge

Coil Freeze
Deck Removed

ONLY UNITS

1. Remove the yellow wire fiom terminal 1 on indoor thermostat (IT).
2. Remove the red fan motor wire fiom LO, and the black
fan motor wire from HI on rotary switch.
3. Remove the control box door and discard.
4. Reinstall the previously saved power cord access cover to
the new control box door supplied with kit.
5. Attach the new control box door by sliding it onto the
control box hinge pins. See Fig. 5.
6. Secure power cord, control board and chassis ground
wiles to control box dool:
7. Attach ribbed/white wire (L2) fiom power cord to temfinal C on capacitol: See Fig. 4.
8. Connect one end of Pink wire (included in plastic bag
labeled "For cooling only installations") to the C termimd
on the capacitoc Connect the other end to L2 on lelay
K2A 1.
9. Reconnect
the following wires on control board (see
Fig. 6).
a. Plain/black wire (LI) from power cord to termimd LI
(brass post terminal) on relay K2.
b. Yellow compressor wire to COMP on relay KI.
10. Attach red fan motor wire to terminal 1 on Fan Speed
Selector switch (FSS) and the black fan motor wile to terminal 3 on FSS. See Fig. 6.
11. Dress wiles using wire ties provided. See Fig. 7.

Fig. 10 -- Sensor Clip for Indoor Coil Freeze
Thermostat (IFT) on Typical Unit

12. Close file control box door and secure
screws saved eafliel:

TUBE

OFT

YELLOW

WIRE

(TERMINAL 3)
YELLOW
(TERMINAL
RED WIRE
(TERMINAL

WIRE
3)

_
\

RED WIRE

(TERMINAL

1)

by re-attaching

13. Attach control knob that was removed earliel: to fan
speed selector switch.
14. Install Indoor Coil Freeze Thermostat (IF_) into coil.
a. Use a pen to make an opening in the fins to install
freeze sensor (Fig. 8).
• For 7000 Btuh and 9000 Btuh units, make tin opening 4-in. from the right side of the coil between the
flfird and fourth row from the top.
• For 12,000 Btuh and 15,000 Btuh units, make tm
opening 4-in. from file right side of file coil
between the second and third row from the top.
b. Route Indoor Coil Freeze Sensor:
• Remove dischtuge

2)

deck. See Fig. 8.

• Route freeze sensor from PC board through plastic
bushing in side panel with electric heater wiles. See
Fig. 7.

Fig. 11 -- Outdoor Coil Freeze Thermostat (OFT)
on PTAC Heat Pump Units

• Push sensor through hole in front flange above the
rating plate. See Fig. 9.
c.
d.

• Re-install discharge deck.
Push freeze sensor into opening made in Step 12a.
Bend clip on scored line and install in fins (the curved
notches will lock clips in place) next to sensor to hold
sensor in place in file coil. See Fig. 10.

15. Replace front panel.
16. Install control panel label on front of control panel, under
door, to cover hole left by removal of control knob.
17. Restore power to unit.

Copyright 2004 Carrier Corporation
Manufacturer

reserves the right to discontinue,
PC 132

or change at any time, specifications

Catalog No. 535-20065

Printed in U.S.A.

or designs without
Form 52C,P-36SI

notice and without
Pg 8

incurring

9-04

obligations,
Replaces:

52C,P-30SI
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