Carrier 52SE, 52SC, 52SQ Installation, Operating And Maintenance Instructions

52S

52S

SERIES

SERIES

INSTALLATION, OPERATING

AND MAINTENANCE INSTRUCTIONS

PACKAGED TERMINAL AIR CONDITIONERS

AND HEAT PUMPS

7,000-14,000 Btuh

CONTENTS

GENERAL
UNIT INSPECTION
ELECTRIC A L DATA

ALL UNITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

VOL TAGE SUPPLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

LOW-VOLTAGE CO N NECTIONS —
REMOTE CONTROL AND ENERGY

MANAGEMENT ACCESSORY . . . . . . . . . . . . . . . . . . 4

INSTALLATION

SLEEVE IN STALLATION REQUIREM ENTS . . . . . . . 5

ACCESSORY INSTALLATION . . . . . . . . . . . . . . . . . . . 9

ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11

Page

OPERATING INSTRUCTIONS

SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . 13

CARE AND MAINTENANCE

AIR INLET FIL TER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

OUTDOOR VENT FILTER . . . . . . . . . . . . . . . . . . . . . . 14

EXTERNAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

INTERNAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

ACCESSORIES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

. . . . . . . . . . . . . . . . 12-13

. . . . . . . . . . . . . . . . . 13-17

1•800•894•6449

For Service/

Technical Assistance

Page

52S

SERIES

GENERAL

These installati on instructions provide easy-to­understand information for installing, operating, and
maintaini ng these packaged air cond itio n er s and he at
pumps. The following models are covered in this book:

52SC Cooling only . . . . . . . . . . . . . . . . . . . . . . . . .60 Hz

52SE Cooling with electric heat . . . . . . . . . . . . . . 60 Hz

52SQ Cooling, electric heat, and heat pump . . . .60 Hz

All models are designed for through-the-wall instal­lation. Separate install a tion instructions are inc lud ed
with all accessory comp onent s.

UNIT INSPECTION

Examine unit for dam age inc ur red d uri ng sh ip m e nt.
File a claim immediately with the transit company if
damage is found.

The data information plate (Fig ur e 1) lists the model
number, volta ge ranges, and other important el ectrical
information about this produc t. Readin g and und er­standing this material is important for proper use of
this unit. To access th e infor m ation plate, the front
panel must be removed; see Figure 2.

To remove the front panel:

1. Grasp panel firmly near top of both sides.

2. Pull panel up the n forw ard.
IMPORTANT: The front panel has to be off the unit

to complete futu re ch eck s and installation proce­dures. Do not reinstall front panel at this time.

FIGURE 1 — SA MP LE DATA

INFORMATION PLATE

Using Figures 1 and 3 as reference, verify that the
packaged termi nal pro duc t or de red will o perate p rop ­erly in your facility. If you do not understand the in­formation given or have questions about the product,
please call your lo cal de aler o r distr ibutor.

FIGURE 2 — REMOVING FRONT PANEL

2

FIGUR E 3 — MODEL NUM B ER NOMENCLATURE

ELECTRICAL DATA

ALL UNITS

ELECTRICAL SHOCK HAZARD

DO NOT alter cord or plug, and DO NOT us e an
extension cord. Personal injury or damage to the
unit may resu lt.

Be sure that your outlet matches the appropria t e
blade configuration of the supplied plug and that it is
within reach of the se rvice cord. A ha rd w ire kit is
available as an accessory to change cord-con nect ed
units to hardw ire d units. The junc tio n b ox ca n b e
mounted with manu fact urer ’s non-e lectr ic su bbase ac­cess ory. (See A ccess o ries s ection, pa ge 18.)

IMPORTANT : All packaged termin al 265-v un its
can either be hardwired or cord-connecte d with
accessory kits. Both accessories must be purchased
separately through your order correspondent.

WIRE SIZE —

■

Use recommended wire size given in
Table 1 and install a single branch circuit. All wiring
must comply with loca l and national codes. All units

are designed to operate off single branch cir­cuits only.

NOTE: Use coppe r conductors onl y.

GROUNDING

■

— For safet y an d protec tio n, th e uni t
is grounded thr o ugh the service co rd p lug o r th ro ugh
separate ground wir e pr ov i ded on hardwired units. Be
sure that the branch circuit or general purpose outlet
is grounded.

TABLE 1 — SUGGESTED BRANCH CIRCUIT

WIRE SIZES*

NAMEPLATE AMPS AWG WIRE SIZE

7.0 to 12

12.1 to 16

16.1 to 24

LEGEND

AWG —

*Single circuit from main box.
†Based on copper wire at 60 C temperature rating.

American Wire Gage

14
12
10

3

52S

SERIES

VOLTAGE SUPPLY

Check voltage supply at outlet. For satisfactory re­sults, the voltag e range must al way s be within the
ranges found on the data information plate
(Figure 1).

208/230-v CORD-CONNECTED UNITS

■

supplied outlet must match the plug and be within
reach of the service cord. Refer to Table 2 for proper
receptacle and fuse type.

TABLE 2 — RECEPTACLES AN D FUSE TYP ES,

250 VOLTS

RATED VOLTS 250

AMPS

BLADE CONFIGURATION

MFG PART NO.

Hubbell
P & S
GE
Arrow-Hart

TIME-DELAY TYPE
FUSE

(or HACR Circuit
Breaker)

LEGEND

HACR —

*May be used for 15-amp applications if fused for 15 amp.

■

Heating, Air Conditioning, Refrigeration

265-v ACCESSOR Y CORD-CONNECTED UNITS —

15 20 30

5661 5461 8330
5661 5871 5930

GE4069-1 GE4182-1 GE4139-3

5661 5861 5700

15 20* 30

The field-supplied outlet must match the plug and be
within re ac h of the servi ce cord. Refer to Ta ble 3 for
the proper receptacle and fuse type.

TABLE 3 — RECEPTACLES AN D FUSE TYP ES,

265 VOLTS

— The field-

FIGURE 4 — SUBBA SE ASSEMBLY

LOW-VOLTAGE CONNECTIONS —
REMOTE CONTROL AND ENERGY
MANAGEMENT ACCESSORY

Energy Man a ge m e nt Ac ce ss o ry m ust be ordered sep a ­rately and field-installed. Low-vo ltag e con nect io ns
must be made fo r Energy Management Units . Refer to
page 10.

Remote control units are supplied with a low-voltage
termin a l b o a rd f o r direct int e rf a c e w i th a f ield­supplied low-voltage, manual changeover thermo­stat or a programmable thermostat (both are
Manufacturer-recommended). When properly wired,
the unit operation is cont rolled by either wall-mou nted
thermostat.

RATED VOLTS 265

AMPS 15/20 30

BLADE CONFIGURATION

MFG PART NO.

Hubbell
Eagle

TIME-DELAY TYPE FUSE

(or HACR Circuit Breaker)

LEGEND

HACR —

*May be used for 15-amp applications if fused for 15 amp.

Heating, Air Conditioning, Refrigeration

—9315

834B-BOX —

20*

IMPORTANT: The 265-v cord-connected units re­quire an accessory subbase, Part No. SUB-BASE,
with a field-installed receptac le . See Table 3 and
Figure 4.

30

4

INSTALLATION

SLEEVE INSTALLATION
REQUIREMENTS

Reminder: Units are shipped with out sleeve.

INSPECT WALL SLEEVE INSTALLATION

■

replacement or retr ofit situation, it is recom m end ed
that a sleeve be used with a chassis from the same
manufac tu rer. R efer to Figu re s 5 a nd 6 f or t y pica l w all
installation and uni t dime n sio ns.

— In a

1. For lateral airflo w app lica tio ns, an acce sso r y lat­eral duct must be used. Refer to Figure 7.

2. The sleeve mu st be mou nted so that it is leve l in
all directions. A

1

/4-in. pitch is built into th e unit
chassis for proper condensate drainage. An acces­sory drain kit is available if needed .

IMPORTANT: If more than 4 in. of the sleeve
projects into the room or the wall is less than 2 in.
thick, an accessor y subb ase mu st be used for sup ­port . R e f er to Fig u re 8 .

3. The sleeve should be caulked on all sides, includ­ing both inside and o uts id e of the building.

TYPICAL WALL INSTALLATION (52SC,SE,SQ)

NOTES:

1. Sleeve may be flush mounted to floor, and front panel may have to be notched
to accommodate service cord.

2. If more than 4 in. of sleeve projects into room an accessory subbase must be
used.

3. If wall is less than 2 in. thick, an accessory subbase must be used.

TYPICAL CURTAIN WALL INSTALLATION

(All Models)

FIGURE 5 — TYPICAL WALL INSTALLATIONS

WALL SLEEVE AND SLEEVE EXTENSION

(Field-Fabricated) (All Models)

NOTES:

1. Unit sleeve and sleeve extension (field-fabricated) should b e connected
before installing in wall opening.

2. Sleeve extension is water-bearing. It must be water tight when installed
against unit sleeve. Use quality grade sealant on all butting flanges. Attach
both sections with bolts and nuts or self-tapping screws installed from unit
sleeve to extension. Cut drain slots in front and rear flanges of extension to
line up with drain openings in unit sleeve.

3. Install 2 center baffles inside sleeve extension to prevent recirculation of out­door air circuit.

3

4. Leave

5. Paint sleeve extension and seal corner and lap joints; clear all drain holes of

6. Install quality flashing under unit sleeve and extension using quality sealant

7. Install unit casing/extension assembly following standard practices. Seal

8. Make provision for a condensate drain extension tube for routing excess con-

9. Attach grille to the outside of the sleeve extension (using field-supplied

10. Seal any gaps between grille and sleeve extension on all sides.

/8-in. roomside projection of extension and 5/8-in. outdoor projection
of sleeve. This allows for unit casing clearance to finished wall plus ample
edging to apply weather sealant between unit sleeve/extension assembly
and wall opening.

excess sealant, paint, etc., to permit free drainage.

between flashing and wall.

assembly to wall on all 4 sides, indoors and outdoors.

densate from the wall sleeve through the sleeve extension to the building
exte ri or.

fasteners).

5

52S

SERIES

SLEEVE INSTALLATION REQUIREMENTS (cont)

FIGURE 6 — DI ME NS ION DRAWING — 52SC,S E, SQ

NOTES FOR FIGURES 6-8

1. Minimum opening sizes apply to all wall openings.

2. Installed wall sleeve must be level from side to side and front to back.

3. Sleeve can be flush mounted to floor, but front panel may have to be
notched to accommodate service cord, except for units with subbase
(see Note 4).

4. When using subbase accessory, wall sleeve must extend 3
minimum into room and 31/4 in. minimum to 51/2 in. maximum above
floor.

1

/4-in.

5. Dimensions in parentheses are in millimeters.

6. For all applications with an accessor y lateral duct, sleeve must ex­tend into the room 1 in. minimum.

7. If wall sleeve extends into room more than 4 in., an accessory sub­base must be used for support.

8. If wall is less than 2 in. thick, an accessory subbase must be used for
suppor t.

6

FIGURE 7 — 52S LATERAL DUCT

FIGURE 8 — 52S WITH SUBBASE

PREPARE SLEEVE FOR CHASSIS

■

INSTALLATION

1. Remove cardboard center support and rear clo­sure panel from wall sleeve. Refer to Figur e 9.

2. Install outdo or gr ille as described in the installa­tion instructio ns supplied with the gr ille .

Only a Carrier outdo or gr ille should be used with
the 52S unit air conditio ne r . Use of any othe r gr ille
must be app roved by Ca rrier i n Syracu se, New Yor k.
In deep-wall applications, if an existing grille is used
on an outdoor wall opening, do not install an addi-
tional outdoor grille o n un it sle eve .

FIGUR E 9 — REMOVING CENTER SUPPORT

AND CLOSURE PANEL FROM

CARRIER WALL SLEEVE

7

52S

SERIES

3. See Figure 10 for typical deep wall application.
Inspect accessory outdoor gril le s.

IMPORTANT: Be sure that the foam strips and/or
baffles provide a good seal between the grille and
condenser coil tube sheets. These foam strips or
baffles provide a barrier to separate condense r air
from the major components (compressor and fan
motor).

If baffles are not installed properly, loss of perfor­mance and premature damage to the major compo­nents can result.

INSTALL CHASSIS IN SLEEVE

■

1. Inspect foam gaskets (top, bottom, bo th side s) on
chassis. (See Figur e 11.) Replac e foam gask e ts if
torn or missing.

FIGURE 11 — 52S SERIES CHASSIS

(Cord Connected Unit Shown)

Chassis weighs between 118 and 138 lbs. For per­sonal protection , seek help when lifting the unit. Lift
unit by holding unit basepan.

NOTES:

1. To permit outdoor grille to be attached to and supported by unit
sleeve, fabricate a sleeve extension so unit sleeve and baffles can
reach outdoor grille. Be sure to provide flashing for proper con­denser run-off to avoid water damage to room interior. Internal or
external drain system may be required.

2. Baffles may be part of the sleeve extension or fixed directly to con­denser coil tube sheets.

3. Caulk all joints between sleeve or baffles and opening in wall.

4. If grille is used on outdoor wall opening,
outdoor grille on unit sleeve.

install an additional

do not

FIGUR E 10 — TYP ICAL DEEP WALL

INSTALLATION — ALL MODELS

(Baffle s are Fie l d Fabric ated)

2. Lift chassis level with wall sleeve.

3. Slide chassis into wa ll slee ve until foam gaskets
on chassis mounting flang e res t firmly ag ains t
front of wall sleeve.

3

4. Screw chassis to wall sleeve with fou r 1

/4-in. long
screws taped to the control box. Four screw holes
are located on both sides of t he mount ing angles of
the chassis. Use o nly th e top and bo ttom scr e w
holes on each side for a plastic sleeve. Use two
middle screw hol es on each side for a met a l s l eeve.

NOTE: If the gasket behind the chassis mounting
angle covers screw holes, push a nail through each
hole before inserting screws to facilitate assembly.

IMPORTANT: The ga skets combi ne w ith the s leev e
face to create a weather barrier. If the chassis is
installed in a non-Carrier sleeve, this weather bar­rier may not be effective.

8

ACCESSORY INSTALLATION

IMPORT AN T : On ly trai ne d , qua lifie d person ne l
and service m echan ics sho uld install electrical
accessories on Carrier 52S series products per
Carrier’s installation instructions. Please contact
your local electrical contractor, dealer, or distribu­tor for assistance.

INSTALL ACCESSORY HARDWIR E KIT OR 2 65- v

■

ACCESSORY CORD-CONNECTED KIT —

Carrier accessory hardwire kit according to the
instructions provided with the accessory. The acces­sory cord-connected kit is for 265-v units only, and
requires an accessory subbase, Part No. SUBBASE,
with a field-installed re ceptacle.

INSTALL THERMOSTAT —

■

All remote con trol

units.

1. Check to be sure power to unit is disconnected.

2. Remove termina l board cover from right sid e of
chassis (see Figure 12).

3. Insert field-s upp lie d low -vo ltag e th erm ostat wire
through bushing on the cover.

4. Connect wires from terminals on the thermostat
to terminals on cha ssis te r m inal bo ar d . See Fig­ures 13A and 13B .

5. Reinstall cove r with two screws.

6. Mount field-supplied thermostat to wall.

7. Set thermostat ant icipat or at 0.8 amp (ma nua l
thermostat only).

Install

LEGEND

Terminal Board

TB —

NOTE: B to B connection for heat pump only.

FIGURE 13A — WIRING CONNECTIONS,

LOW-VOLTAGE MANUAL CHANGEO VER

THERMOSTAT

FIGURE 12 — LOW-VOLTAGE TERMIN AL BOAR D

LEGEND

Terminal Board

TB —

NOTE: B to B connection for heat pump only.

FIGURE 13B — RC WIRING CONNECTIONS,

PROGRAM MABLE THE RMOSTAT

9

52S

SERIES

INSTALL ENERGY MANAGEMENT (EM) ACCES-

■

SORY KIT —

units to be turned off from a remote location such as a
hotel control desk t o conser ve energy w hen the room is
unoccupied. Freeze guard protection prevents the
room temperature from dropping below 40° F, overr i d­ing any OFF command, including front desk control.

IMPORTANT: In order for freeze guard to operate,
the unit must be put into the HEAT mode.

Electric heat will remain activated until the tempera­ture rea ches app ro ximately 60° F.

IMPORTANT: The manufacturer currently does
not supply any central desk equipment. This type
of equipment should be handled through your local
electrical contractor.

This accessory kit permits individual

See Figure 1 4 f or a cc es s o ry kit lo ca tion in control box.
After EM accessor y kit has be en pro p erly ins talle d ,
connect low-voltage (24 VAC) field-supplied wires from
chassis terminal board to your central desk panel (see
Figure 15).

FGT —

NEC —
SW —
TB —

NOTES:

1. All wiring must conform with NEC and local codes.

2. Field control wiring suitable for NEC Class 2 control circuit, at 24 volts.

Freeze Guard
Thermostat
National Electrical Code Field Control Wiring
Switch
Terminal Board

LEGEND

PR

Terminal Board
Connection

Primary Relay

FIGURE 15 — EM ACCESSORY KIT

SCHEMATIC DIAGRAM

ADJUSTMENTS

ADJUST AIRFLOW DIRECTION

■

air grille is mount ed on the un it so that th e air dis ­charges forward. If upward discharge is required,
remove the gr ille, in ve rt it, a nd re ins tall o n the
chassis.

ADJUST VENT —

■

The VENT knob is lo c a te d on the
side of the unit . S l i de VENT knob manually to o pen or
close vent. Vent r emains in the positi on se lecte d .

— The discharge

FIGURE 14 — EM ACCESSORY KIT

10

ADJUST L IMITS ON ECONO ZONE® II CON-

■

TROL

— (This adjustment is optional and is not ap­plicable to remote-control units.) Econo Zone II
control permits adjustment of the temperature range
available to the user by restri cting rotation of the
TEMPERATURE control knob.

To adjust:

1. Remo ve thermos ta t control knob and t he co ntrol
panel. To detach the control panel, remove two
screws at base of panel and gently pull off panel.
Once removed , th e temp erature limiter is
exposed. (See Figure 16.)

2. Orient the sh aft of the the r m o stat so that the rib
on the ven t control lever assem b ly, which i s
located under the limiter, is positioned between
the temperature limits desired.

NOTE: The numbers stamped on the limiter repre­sent degrees F and are approximate.

3. To set minimum cool s etting , remove cl ip from the
hole marked 60 and relocate to hole with desired
setting. Repeat with clip from hole marked 90 to
set maximum heat setting desired.

IMPORTANT: Clips must be fully inserted.

4. Reinstall the con trol p ane l and the thermostat
control knob. If adjusted prop erly, the indica tor on
the control knob should al ways s win g through the
top section of the temperature markin gs on the
control p ane l .

FIGURE 16 — ECONO ZONE II

TEMPER ATURE LIMITE R

11

52S

SERIES

OPERATING INSTRUCTIONS

SWITCH SETTINGS

For 52S remote control (RC) units, all switches are
located on the wall-mounted thermostat. (See
Figures 17 and 18.)

For all other 52S units, roo m contr o ls are loc ated on
the unit cont ro l pa ne l. Ref e r to Fig ure 19, A and B.

A. 52S COOLING ONLY UNIT

B. 52S COOLING/HEATING UNIT

C. 52S COOLING/HEATING UNIT

WITH REMOTE CONTROL (BLANK PLATE)

FIGURE 17 — STANDARD MANUAL

CHANGEOVER THERMOSTAT (FOR RC UNITS)

NOTE: Thermostat cover swings open to left for additional programming
options.

FIGURE 18 — PROGRAMMABLE THERMOSTAT

(FOR RC UNITS)

FIGURE 19 — UNIT CONTROL PANELS

OUTSIDE A IR —

■

vent lever to OPEN position.

OFF —

■

FAN ONLY

■

without heating or cooling.

HIGH HEAT OR HIGH COOL

■

rotate temperature knob to desi red c omfort level. Th is
function provides maximum heating or cooling, and is
recommended to raise or lower the room temperature
quickly. Once the occupi ed space has reached the
desired comfo rt leve l, this se tt ing is no t r eq uired. See
Finding Temp e ra tur e Sett ing se c tio n belo w f or mor e
information.

LOW HEAT OR LOW COOL —

■

rotate temperature knob to desi red c omfort level. Th is
function provides minimum heati n g or coolin g with
maximum dehumidification.

FINDING TEMPERA TURE SETTING FOR YOUR

■

COMFORT LEVEL —

number 5 and number 6. Push Hig h or Low H eat or
Cool button and allow unit to run 15 to 30 min utes. If
room is not comfortable, turn knob one number at a
time. When room is comfortable, keep control knob at
that position.

The OFF button terminates unit operation.

— Push button for air circulation

Push FAN ONLY butt on and slide

— Push button, and

Push button and

Set temperature knob between

12

OPERATING CONTROLS

HEAT
PUMP

ELECTRIC

HEAT

VENT

CLOSED

OPEN

CON

CYC

OUTDOOR
THERMOSTAT
(ON HEAT
PUMP ONLY)

FAN CYCLE
SWITCH
(NOT ON RC
UNITS)

VENT
LEVER

The following control s are locat ed on the rig ht side of
the chassis. (See Figur e 20.) To obt ain ac cess to op­erating controls, remove the unit front panel as shown
on page 2.

IMPORTANT: When unit is first started, high
humidi ty condit i o ns can cause co nd e nsation to
form on grille. Keep door s and win d ow s close d .
Room humidity decreases and moisture
evaporates.

HEAT
PUMP

OPEN/CLOSED

HEAT
MODE

VENT

ELECTRIC

NOTE: ELECTRIC HEAT
MODE WILL DISABLE
COMPRESSOR OPERATING.

52SQ506082 REV-

FAN CYCLE SWITCH

■

— (Not available on RC

units.) This allows the fan to operate i n two modes:

— This setting allow s the fan to run co ntin u-

CON
ously, circulating air even when the temperature set­ting has been satisf ied . This switch helps to main tain
the room temperatu re clos er to th e thermos tat sett ing.
Use this switch position when maximum comfort is
desired.

— This setting allows the fan to cycle on and off

CYC
with the compr essor d uring heating or c ooling. Th e fan
stops when the te m per atu re se tting is satisfied. This
results in longer unit off-time and wider variations in
room temperature and humidity.

OUTDO O R TH ERMOSTAT (52 S Q HE AT PUMP

■

UNITS ONLY)

— If the setscrew is left at the factory
setting (in the fully clo ckwise position) , the un it will
operate in the revers e cycle heat i ng mode. The control
is the defrost ther mo stat in this m o de. Th e 52SQ the r ­mostat sensing capillar y is lo cat ed be tw een the fins of
the outdoor coil. When the temperature at the capil­lary reaches 2 5° F, th e outdoor frost t hermost at clos es,
shutting off the compre ssor and energi zing the elec tric
heater. The electric heater remains on until the tem­perature at the outdo o r ther m o stat ca p illar y reach e s
40° F; then the electric heater is shut off and the com­pressor is energize d. To set unit t o operate in electric
heat mode only, turn the setscrew to the fully counter­clockwise positi on. Once in electric heat mode, the
compressor is disabled for heatin g and coo lin g.

VENT CONTROL

■

— See Adjustments on page 10

for vent operatin g info r m atio n.

FIGURE 20 — TYPICAL 52S SERIES

OPERATING CONTROLS

CARE AND MAINTENANCE

In order to maintain proper performance of your pack­aged terminal air con d itione r or heat pu m p, it is very
important that the fan and outdoor coils , the blower
wheel, blower scroll, electric heater, and all drain pas­sages are thoroughly cleaned at least once per year.
Carrier recommends tha t as a minimum, the cleaning
should be cond uc te d pri or to th e start o f eac h he atin g
season. The air inlet filter should be cleaned every
month.

Depending on local conditions, more frequent clean­ing of the unit may be required to ensure optimum
performance and long operating life. Examples of
these special conditions include areas where construc­tion dust or heavy airborne dirt is found, or environ­ments that promote the growth of fungus.

Some local condit ion s and environments can cause
fungi to grow inside the air conditioner, especially
on indoor blower se cti on . D ried fungi, dirt and other
foreign ma terial are fire hazards. B e sure to cle a n
unit accordin g to the instr uc tio ns th at foll ow .

AIR INLET FILTER

AIR INLET FILTER

■

month.

1. If front panel has not been remo ved, remove panel
as shown in Figure 2. To remove filter, grasp two
filter tabs and pull the filte r fo rwa rd (Figure 21).

should be cleaned once each

13

52S

SERIES

INTERNAL PARTS

FIGURE 21 — REMOVING FILTER

2. Clean by va cuum ing or washing. T o reinstall the
filter, fit it into the basepan, making sure the
notch in the filter fits aro un d the th e rmo stat cap ­illary. The filter media is plastic fram ed for ad­ditional support. Take care not to rip the media
when cleaning. Additional filters are available in
multi-packs.

3. Flex the filter, and fit it under the discharge deck.

OUTDOOR VENT FILTER

OUTDOOR V ENT FILTER

■

cleaned in the same manner as the air inlet filter , but
only once during a cooling or heating sea so n. Remove
chassis from sleeve to access vent filter . Dirty f ilters
restrict airflo w, which c a n re d uce majo r component
life.

(Figure 22) should be

INTERNAL PARTS

■

should be cleaned at least once

each year.

Before cleaning, servi cing, perf o rming maintenanc e
or removing the chassis from the sleeve, disconnect
all power to the unit to avoid the possibility of elec­trical shock and personal injury.

DISCONNECT POWER TO U NIT:

■

CORD-CONNECTED UNITS

1. REMOTE CONTROL UNITS — Set switch on
wall mounted thermostat to OFF.

ALL OTHER UNITS — Push OFF button on unit
control p ane l .

2. Disconnect power at main power supply.

3. Unplug the unit service cord.

HARDWIRED UNITS

1. REMOTE CONTROL UNITS — Set switch on
wall mounted thermostat to OFF.

ALL OTHER UNITS — Push OFF button on unit
control p ane l .

2. Disconnect power at main power supply . Ta g dis­connect to ensure no one restores power to the
unit. If front panel has not been removed, remove
panel as shown in Figure 2. Remove access cover
on side of unit chassis. Pull out plug assembly and
disconnect (see Figure 23).

CONTROL
BOX

WIRING
DIAGRAM

ACCESS
COVER

VENT
DOOR

FIGURE 22 — OUTDOOR VENT FILTER LOCATION

(Left Side of Chassis)

EXTERNAL PARTS

EXTERNAL PARTS

■

grilles. The sleeve manufacturer recommends cleaning
the surface, including the grilles, with household
detergent and water.

inclu de the poly m er sl eeve a nd

VENT
FILTER

14

PLUG
ASSEMBLY

FIGUR E 2 3 — DISCONNE CTING PLU G

ASSEMBLY ON HARDWIRED UNITS

DISA SSEMBLE UNIT

L

TOP COVER
SCREW

■

TOOLS REQUIRED include: a low-pressure tank with
wand and/or spray bottl e , a coil cleaner (Calgon,
Hydrob al ance, et c.), a vacu um cl e aner, percolato r
brush, standard spr ay bo ttle, rubber glove s, sa fety
glasses,

5

/16-in. nut driver, and a stand ard Phillips-

head screw d riv er.

1. If front panel has not been remo ved, remove panel
as shown in Figure 2 .

2. Remove scr ew s (two eac h side ) fa ste nin g ch assis
to sleeve.

For uni ts with late ral duct accessory — remove
four screws fastening chassi s to sleeve, a nd two
screws on top of duct adapter. See Figure 24.

Chassis weighs between 118 and 138 lbs. For per­sonal protection, seek help when lifting the unit.

3. Slide out chassis. Lift by holding the unit
basepan.

4. Remove aluminum top panel (one screw each
side). See Figure 25. On left-hand side, remove the
screw clo sest to the parti ti o n.

5. Remove the air dischar ge grille (two sc rews ). See
Figure 26.

6. Remove the top cover (one screw). See Figure 27.

FIGURE 25 — ALUMINUM TOP PANEL

TOP PANE
SCREW

FIGURE 24 — REMOVING CHASSIS WITH

DUCT ADAPTER FROM SLEEVE

FIGURE 26 — REMOVING AIR

DISCHARGE GRIL LE

FIGURE 27 — TOP COVER SCREW

15

52S

CONDENSER
ORIFICE

SERIES

7. Remove the gusset (two screws inside the parti­tion, one screw at condens er orifi ce). Push con­denser orifice outward. Pu ll the gusset up and out
of orifice. See Figure 28.

8. Unsnap the condenser orifice from the tube
sheets.

9. Remove the stator by moving the condenser ori­fice toward the partition and by pulling the stator
straight up. See Figure 29.

10. Remove the air inlet filter (see removal instruc­tions under AIR INLET FILTER, page 13).

11. Remove thermostat sensing bulb from the indoor
coil by pulling two bulb re tain ing clips out of the
coil fins and carefully moving the bulb away from
the face of the coil.

GUSSET

PARTITION

CLEANING DISASSEMBLED UNIT

■

1. Clean the indoor coil and stator side of the out­door coil by washing or vacuuming.

Fins are sha rp a n d can cut hands. Wear heavy
gloves when cleaning coil s . Whe n using clea nin g
tools, be careful not to bend or damage coil fins.

2. Clean vent screen by washing or vacuuming.
Open vent door and pull s cr een out. See Fi gure 30.

3. Clean basepan, including drain passages and area
inside the condenser orifi ce, by washing or vacu­uming. See Figure 30.

4. To clean indoor blower wheel and scroll, insert a
piece of 9.0 x 9.0-in. cardboard between the blower
wheel and the opening in the blower scroll. This
will also prevent fungus and other debris from
falling into the coil.

VENT

DOOR

DRAIN
PASSAGE

FIGURE 28 — REMOVING GUSSET

STAT OR

CONDENSER
ORIFICE

CONDENSER
COIL

FIGURE 29 — REMOVING STATOR

DRAIN
V

ALVE

OVERFLOW
NOTCH
(1) EACH SIDE

FIGURE 30 — BASEPAN SECTION

16

5. Bend a soft, spiral wound, long bristle bru sh to
confor m t o th e inner curve of the bl ower whee l
blades. See Figure 31.

6. Insert the brush into every blower wheel blade
and gently brush out dried mate r ial.

7. Cl ean the wa l l s of t he blo w er scroll by carefull y
brushing with the bristle brush. Vacuum loose
debris that may have fallen into the bottom of the
scroll during the cleaning process.

8. Use the spray bottle to spray the blower whee l
blades and the inner surfac e of the blowe r scroll
with a 3% solution of hy dro gen p e roxide to kill
any fungus spores. Wipe up excess solution in the
bottom of the blower scroll with a clean cloth. See
Figure 32.

9. Clean the inside of the wall sleeve and rear grille
by washing or vacuuming. Test wall sleeve dra in
holes and accessory drains (if used) for proper
drainage. Pour water (approximately 2 quarts)
into the sleeve. Water should drain freely.

FIGURE 32 — SPRAYING BLOWER WHEEL BLADES

REASSEM BL E UN IT

■

1. Reassemble components by reversing disassembly
procedures described on page 15.

2. Reinstall un it into sle e ve.

3. Turn on all power to the unit.

FIGURE 31 — CLEANING INDOOR FAN

AND FAN SCROL L

17

52S

SERIES

ACCESSORIES

Corrosion-Protected
Pol ymer Sle ev e

Standard
Non-Electrical
Subbase

Standard Grille

Standard
Architectural Grille
in Aluminum or Plastic

Lateral Duct Kit

Hardwire Kit

External Drain Kit Application

Energy Management Kit

GE Metal Sleeve Retro-Fit Kit

265-v Cord Kit

Locking Control Door Kit

60

70

80

90

ON

AUTO

FAN

COOL

O

FF

HEA

T

Standard Manual Changeover
Thermostat

18

Programmable Thermostat

19

52S

SERIES

Copyright 1999 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4
Tab 9a 11a

PC 132 Catalog No. 535-232 Printed in U.S.A. Form 52S-47SI Pg 20 12-99 Replaces: 52S-46SI