52C,P
52C,P
SERIES
SERIES
SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
CONTENTS
INTRODUCTION
SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT DISASSEMBLY
TOOLS NEEDED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REMOVE FRONT P ANEL . . . . . . . . . . . . . . . . . . . . . . . 3
DISCONNECT POWER FOR
CORD-CONNECTED UNIT . . . . . . . . . . . . . . . . . . . . . 3
DISCONNECT POWER FOR PERMANE N TLY
CONNECTED (HARDWIRED) UNITS . . . . . . . . . . . . 3
OPEN THE CONTROL BOX. . . . . . . . . . . . . . . . . . . . . 4
REMOVE THE UNIT FROM THE W ALL SLEEVE . . 4
ACCESSING UNIT COMPONENTS
ACCESSING INDOOR-AIR SECTION
COMPONENTS (UNITS WITH LATERAL
DUCT ACCESSORY). . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ACCESSING INDOOR-AIR SECTION
COMPONENTS (UNI TS WIT HOU T L ATERAL
DUCT ACCESSORY). . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ACCESSING OUTDOOR-AIR SECTION
COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
GENERAL CLEANING
CLEANING AND SAFETY . . . . . . . . . . . . . . . . . . . . . . 9
TOOLS NEEDED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MONTHLY CLEANING. . . . . . . . . . . . . . . . . . . . . . . . 10
SEASONAL CLEANING . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
. . . . . . . . . . . . . . . . . . . . . . . . . . .3,4
. . . . . . . . . . . . . .5-8
. . . . . . . . . . . . . . . . . . . . . . . . .9-12
Page
COMPRESSOR
COMPRESSOR TROUBLESHOOTING . . . . . . . . . . .14
BASIC HERMETIC COMPRESSOR
ELECTRICAL MEASUREMENTS. . . . . . . . . . . . . . . .14
COMPRESSOR REPLACEMENT . . . . . . . . . . . . . . . .15
HEATERS
COMMON CAUSES OF HEATER FAILURE. . . . . . .18
HEATER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . .18
OPERATING CONTROLS
DESCRIPTION OF SELECTOR
SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . .22
NON-USER ADJUSTABLE CONTROLS . . . . . . . . . .22
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . .23
COMPONENT OPERATION AND
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . .23
ELECTRICAL COMPONENTS REMOVAL
AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . .26
FAN MOTOR
FAN MOTOR TROUBLESHOOTING. . . . . . . . . . . . .28
BASIC FAN MOTOR ELECTRICAL TESTS. . . . . . . . 28
FAN MOTOR REPLACEMENT. . . . . . . . . . . . . . . . . .30
WIRING DIAGRAMS
MOST FREQUENT PTAC SERVICE
QUESTIONS
ACCESSORIES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
. . . . . . . . . . . . . . . . . . . . . 20-27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-30
. . . . . . . . . . . . . . . . . . . . . . . . 31-35
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
PTAC Customer Support Center
1•800•894•6449
Page
52C,P
CANADIAN INSTALLATION
SERIAL 3701X11520
DATE OF MFG. 09/12/2001
VOLT RANGE 187-253
VOLTS 230/208
PH 1
MODEL 52PQA312301AA
HZ
60
MIN CKT AMPACITY 19.3
R-22 OZ 34
DESIGN PSIG 350 HIGH SIDE, 150 LOW SIDE
COOLING
HEATING
BTU/HR 12,100/12,000
AMPS 4.8/5.3
WATTS 1100/1100
EER 11.0/10.9
MOTOR
FAN
COMP
HP
FLA
RLA
LRA
6.1
29
0.75
1/8
BTU/HR 10,800/10,700
AMPS 15.6/14.5
WATTS 3570/2997
COP 3.2/3.2
HEATER
BTU/HR
AMPS 14.8/13.7
WATTS 3400/2850
WATER
STEAM
20
20
20
USE
TIME DELAY FUSE
OR HACR TYPE
CIRCUIT BREAKER
AMP
AMP AMP
MAX FUSE
MAX BREAKER
SERIES
INTRODUCTION
The focus of this manual is to provide basic information
on service procedures, safety, troubleshooting, cleaning, and component replacement for service technicians. It is intended for use only by HVAC service
technicians who have successfully completed
instruction and received Type I Certification
from the U.S. Environmental Protection Agency.
The instructions in this manual are general in nature
and are not to be substituted for installation and service instructions shipped with the unit. No attempt to
install, ope rate, adju st, re pair , or di smant le any equi pment should be made until the manufacturer’s i nstructions are read and thoroughly understood by the
service technician. Even equipment that seems familiar may have specific model diffe rences from year to
year. Always review manufacturer’s instructions.
Model 52C,P packaged terminal air conditioner
(PTAC) and heat pump units are self-contained for
installation through the wall for individual room heating and cooling. The Model 52C,P polymer and metal
sleeves are permanently fastened to the wall; the unit
chassis slides out of the sleeve to allow the service
technician easy access. Many accessories are offered
to complement the unit’s performance and comfort
control.
Before beginning any service procedu res, it is important to check the unit model number. See Figure 1 and
2. Units that seem similar may have subtle differences
that could affect service procedures. The following
units are covered in this manual:
52CE — 60 Hz cooling with electric heat units
52CQ — 60 Hz cooling with electric heat and heat
52PE — 60 Hz cooling with electric heat units
52PQ — 60 Hz cooling with electric heat and heat
52PC — 60 Hz cooling only units
Knowing which model is being serviced will help deter-
mine if the unit is performing at optimum levels. The
model number is located on the data informatio n plate
beneath the front panel of the unit. See Figure 1. The
data information plate also lis ts voltage ranges and
other important electric al information about the unit.
SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS
The terms DANGER, WARNING, and CAUTION have
specific meanings that identify the degree of hazard.
Typically in the HVAC industry, these specific meanings are:
There is an immediate hazard which WILL result
in severe personal injury or death.
pump units
pump units
Hazards or unsafe practices which COULD
result in severe personal injury or death.
Potential hazards or unsafe practices which
COULD result in minor personal injury or equipment damage.
FIGURE 1 — SAMPLE DATA INFORMATION PLATE
2
52 PQ A 3 12 3 0 1 AA
Series Designation
PTAC (Packaged Terminal Air Conditioner)
CE – Cooling with Electric Heat
CQ – Heat Pump with Electric Heat
PC – Cooling Only
PE – Cooling with Electric Heat
PQ – Heat Pump with Electric Heat
Latest Revision
A – Z
Electric Heater Size
0 – No Heating (Cooling Only Model)
2 – 2.3 kW
3 – 3.4 kW
5 – 5.0 kW
Cooling Capacity (nominal)
07 – 7,000 Btuh
09 – 9,000 Btuh
12 – 12,000 Btuh
15 – 15,000 Btuh
FIGURE 2 — MODEL NUMBER NOMENCLATURE
UNIT DISASSEMBLY
This section includes common procedures for disassembly and re-assembly of u nit.
IMPORTANT: Follow manufacturer’s instructions when disassembling and re-assembling a
unit for cleaning, maintenance, or part replacement. When disassembling wiring, it is strongly
recommended that numbered stickers be
attached to identify leads and terminals to aid in
the re-assembly process. Always review safety
procedures prior to the start of a job.
Prior to servicing electrical equipment, disconnect all power to avoid electric shock! Tag all disconnects. Never alter cord or plug and do not use
extension cords.
TOOLS NEEDED
The following field-supplied items are recommended
for general disassembly of the unit:
• Flat head screw driver
5
•
/16-in. nut driver
• Safety glasses
• Needle nose pliers
Chassis Options
Blank or AA – Standard
CP – Corrosion Protection
RC – Wall Thermostat Control
RP – Wall Thermostat Control with
Corrosion Protection
Packaging
1 – Domestic
Non-Performance
Changes 0-9
Electrical Data
3 – 230/208-v, 60 Hz
4 – 265-v, 60 Hz
See Figure 3. If a lateral duct accessory is installed, the
plenum must be removed before removing the front
panel. Refer to Remove Lateral Duct Extension section
for removal instructions.
1. Grasp the front firmly ne ar bottom of both sides.
2. Pull the panel forward then upward to release
magnetic latches and partition hooks . See Figure 4.
DISCONNECT POWER FOR
CORD-CONNECTED UNIT
1. Turn selector switch to OFF position.
2. Open the disconne ct swit c h a t ma in po wer su pply.
Use proper Lockout and Tag procedures.
3. Unplug the unit service cord.
DISCONNECT POWER FOR
PERMANENTLY CONNECTED
(HARDWIRED) UNITS
1. Turn selector switch to OFF position.
2. Open the disconne ct swit c h a t ma in po wer su pply.
Use proper Lockout and Tag procedures.
3. Remove screw from access cover and remove
access cover.
4. Pull out the plug assembly and disconnect. See
Figure 5.
REMOVE FRONT PANEL
NOTE: Before removing front panel, remove 2 locking
screws (if installed) located behind the filter handles.
3
52C,P
SERIES
OPEN THE CONTROL BOX
The control box is factory wired. To open the box,
remove the 2 screws on the top of the control box and
lower the front hinged panel. See Figure 6.
REMOVE THE UNIT FROM THE
WALL SLEEVE
1. Remove the four moun tin g scr e ws tha t secu re th e
PTAC unit to the wall sleeve (2 screws per side).
See Figure 7.
2. Grasp the sides of the unit and slide it from the
sleeve.
NOTE: The mounting screws ma y be in a differen t
location depending on brand of wall sleeve
attached.
REMOVABLE
FILTER
LOCATION OF
REMOVED FILTER
LOCKING SCREW
(NOTE: 2nd LOCKING SCREW
IS LOCATED BEHIND
2nd FILTER)
FIGURE 3 — LOCATION OF LOCKING SCREWS
BEHIND FILTERS
FIGURE 4 — REMOVING FRONT PANEL
Replacement Package Terminal Air Conditioner,
CLASSIFIED BY UNDERWRITERS LABORATORIES INC., AS TO ELECTRIC SHOCK, FIRE AND
CASUALTY HAZARDS ONLY. FOR FIELD INSTALLATION WITH EXISTING WALL SLEEVES, OUTDOOR, LOUVERS, AND INDOOR PANELS AS
SPECIFIED ON THE PRODUCT.
The chassis weighs between 110 and 150 lbs. Take
proper safety precautions to avoid personal injury
when lifting and moving the chassi s.
The unit basepan may have water in it. Tilt the
unit back slightly whe n removing it fro m th e sl e eve
to drain some of the water into the sleeve.
CONDUIT
ACCESS
PANEL
MOLEX
PLUGS
FIGURE 5 — PLUG ASSEMBLY ON
HARDWIRE UNITS
4
POWER
GE WALL
SLEEVE
HOLES
AMANA, TRANE
(SLOTTED
HOLES) WALL
SLEEVE HOLES
VARIOUS ATTACHMENT
HOLE LOCATIONS
CARRIER, BRYANT
WALL SLEEVE
HOLES
CORD
ACCESS
COVER
POWER
CORD
FIGURE 6 — CONTROL BOX COVER
CONTROL
BOX
SCREWS
FIGURE 7 — PTAC UNIT TO WALL
SLEEVE MOUNTING SCREWS
ACCESSING INDOOR-AIR SECTION
COMPONENTS (UNITS WITH LA TERAL
DUCT ACCESSORY)
REMOVE LATERAL DUCT EXTENSION
■
ACCESSORY ONLY ON UNITS EQUIPPED WITH
THE LATERAL DUCT
1. Remove the 2 top screws that secure the lateral
2. Locate and remove the 2 bottom bracket screws
3. Carefully lift the plenum up and away from front
ACCESSING INDOOR-AIR SECTION
COMPONENTS (UNITS WITHOUT
LATERAL DUCT ACCESSORY)
REMOVE THE DISCHARGE DECK ASSEMBLY
■
1. Remove the front panel. Re fer to Remove Front
2. Remove discharge screen screw using a
ACCESSING UNIT COMPONENTS
duct plenum to the top of the lateral duct extension. See Figure 8.
(located opposite extension duct) that secure the
lateral duct plenum to the brac ket flange. See
Figure 8.
panel and duct extension.
Panel section and Figure 4.
driver. See Figure 9.
5
/16-in. nut
3. Remove th e disch arge dec k asse mbly scre ws usin g
5
a
/16-in. nut driver. See Figure 9.
4. Gently pull the deck/grille up and away f rom the
unit.
5. Reassemble by reversing steps above.
ACCESSING THE HEATER ASSEMBLY
■
— Once the
discharge deck assembly is removed, the Heater
Assembly should now be accessible. See Figure 10.
1. Using pliers, carefully remove all wires connected
to the heater assembl y. Label ea ch wire for ea se of
re-assembly.
2. Gently pull the heater assembly up and away
from scroll. See Figure 11.
3. Reassemble by reversing steps above.
ACCESSING OUTDOOR-AIR SECTION
COMPONENTS
REMOVE THE GUSSETS (See Figure 12)
■
1. Remove the 2 screws on each side that secure the
gussets to the partition.
2. Remove the 2 screws that secure the gussets to
the plastic condenser orifice and remove the
gussets.
5
52C,P
SERIES
END CAP
BRACKET
SCREWS
PLENUM LATERAL DUCT
LEFT
BRACKET
TOP
SCREWS (2)
EXTENSION
RIGHT
BRACKET
FIGURE 8 — PTAC UNIT WITH LATERAL
DUCT ACCESSORY INSTALLED
ATTACHMENT
SCREWS
WALL
BRACKET
SCREWS
HEATER ASSEMBLY
FIGURE 10 — ACCESSING HEATER
HEATER PLATE
ASSEMBLY
PLATE ASSEMBLY
DISCHARGE
SCREEN
DISCHARGE
DECK
FIGURE 9 — LOCATION OF ATTACHMENT
SCREWS ON DISCHARGE DECK OF UNIT
DETACH THE CONDENSER ORIFICE FROM THE
■
CONDENSER COIL
1. Remove top half of condenser orifice.
a. Unscrew the top half of the condens er orifi ce b y
removing the 4 captive screws. See Figure 13.
b. Using a flat head screwdriver, gently pry the
top half of the orifice from the tube sheets. See
Figure 14.
c. Remove top of condenser orifice. See Figure 15.
2. Remove bottom half of condenser orifice.
a. Using a flat head screwdriver, gently pry the
bottom half of the orifice from the tube sheets.
See Figure 14.
b. Remove 2 outdoor coil tube sheet screws using a
Phillips head screwdriver. See Figure 16.
c. Carefully lift condenser up and away from con-
denser fan. Rest con d e nse r on bas epan . Se e
Figure 17.
FIGURE 11 — REMOVAL OF HEATER
PLATE ASSEMBLY
d. Using Needle Nose Pliers remove co ndenser fan
hub clamp. See Figure 18.
e. Pull condenser fan off fan motor shaft.
f. Remove bottom half of condenser orifice.
3. Reassemble by reversing steps above.
REMOVE THE AIR DISCHARGE GRILLE
■
1. Remove the front panel from the unit, reference
Remove Front Panel section.
2. Flip the panel front panel over to the backside.
Remove the 2 screws on each end of the air discharge grille and remove grille. See Figure 19.
The grille can be positioned to direct the
discharge air up or out by simply rotating
the grille 180 degrees.
6
GUSSET
GUSSET
SCREWS
CONDENSER
ORIFICE (PLASTIC)
PARTITION GUSSET
GUSSET
SCREWS
FIGURE 12 — GUSS ET RE M O VAL
CONDENSER
ORIFICE
CAPTIVE
SCREWS (2)
CAPTIVE
SCREWS (2)
FIGURE 13 — LOCATION OF CAPTIVE SCREWS
ON CONDENSER ORIFICE
FIGURE 14 — PRYING CONDENSER ORIFICE
AWAY FROM TUBE SHEET
FIGURE 15 — REMOVING TOP OF
CONDENSER ORIFICE
7
52C,P
SERIES
OUTDOOR COIL TUBE
SHEET SCREWS
FIGURE 16 — LOCATION OF OUTDOOR
COIL TUBE SHEET SCREWS
CONDENSER
FAN
HUB CLAMP
FIGURE 18 — REMOVING CONDENSER
FAN HUB CLAMP
CONTROL DOOR
HINGE PINS
FRONT PANEL
(BACK VIEW)
SCREW SCREW
DISCHARGE
GRILLE
FIGURE 19 — LOCATION OF SCREWS ON
DISCHARGE GRILLE
FIGURE 17 — REMOVING OUTDOOR COIL
FROM CONDENSER FAN
8
GENERAL CLEANING
Maintaining proper performance of 52C,P systems
requires conscientious cleaning and care of components. See Figure 20. Specific components require
periodic cleaning and/or replacement, including the
following:
COMPONENT CLEANING SCHEDULE
Indoor Air Filter
Vent Air Filter
Indoor Coil
Indoor Fan
Outdoor Coil
Monthly
Monthly
Seasonally
Seasonally
Seasonally
CLEANING AND SAFETY
Before starting to clean a unit, read the instructions
thoroughly and gather the necessary tools for the job.
Review all safety information on unit and in literature.
Before cleaning, servicing, performing maintenance,
or removing the chassis from the wall sleeve, disconnect all power to the unit to avoid the possibility of
electrical shock and personal injury. Only trained
and qualified service personnel should perform
installation and service procedures on these units.
Untrained personnel may perform basic maintenance tasks such as cleaning and replacing filters.
Refer to General Disassembly section of this ma nual
for proper procedures to disconnect power to 52C,P
units.
Consider the following safety issues before
beginning:
• New and unfamiliar tasks should be performed
under the supervision of an experienced service
technician.
• Personal protective equipment, such as safety
glasses and work gloves, should be used.
• The floor around the work area shoul d be clea n and
free of debris.
• The 52C,P unit weighs up to 150 pounds. Use a lifting device or ask for assistance if the unit must be
moved.
• Make sure tools are the correct tools for the job, and
that they are working properly and in good condition.
FRONT
PANEL
(STANDARD)
CHASSIS
(STANDARD)
FIGURE 20 — STANDARD 52C UNIT
EXTERIOR
GRILLE
(ACCESSORY)
WALL SLEEVE
(ACCESSORY)
9
52C,P
SERIES
TOOLS NEEDED
The following list includes the recommended tools,
devices, and cleaning solutions for use in cleaning the
52C,P unit and components.
Vacuum Cleaner with Crevice Tool Attachment,
Lifting Device (or another person for assistance)
Trigger Spray Extension Tube (Part No. P9029000)
Vent Air Filter Replacement (Part No. 52CQ500144)
Condenser Coil Cleaning Solution (Part No. P9020501)
Evaporator Coil Cleaning Solution (Part No. P90221001)
3% Solution of Hydrogen Peroxide in Spray Bottle
MONTHLY CLEANING
AIR FILTERS
■
should be cleaned once per month. F ilt ers that are not
cleaned become clogged and will restrict airflow. This
may lead to major component damage. If a filter
becomes torn, has holes, or other damage, replace it
with a new one. Replacement filters are available
through Carrier Finished Goods and Carrier Replacement Component Division.
CLEANING THE INDOOR AIR FILTER
■
filters are located in the unit’s front panel. To remove
each filter simply grasp each filter handle with both
hands and gently pull the filter up and away from the
unit. See Figure 21.
or Soft Plastic Bristle Brush
Mild Household Detergent
Phillips Head Screwdriver
5
/16-in. Nut Driver
Flat Head Screw Driver
Needle Nose Pliers, 90° Bend
Tank Sprayer (Part No. P9021001) or
Compressed Air Tank
Clean Water Supply
Indoor Air Filter Replacement
(Part No. AIR-FILTER-10PAK)
10-in. by 29-in. Piece of Clean Cardboard
Clean Cloth
Safety Glasses
Protective Gloves
— The indoor and vent air filters
—
Two air
REPLACING THE INDOOR AIR FILTER
■
—
Remove the indoor air filter as detailed in Cleaning
the Indoor Air Filter. If damaged, use a filter replacement with the Carrier Part No. AIR-FILTER-10PK,
available through Carrier Finished Goods and Carrier
Replacement Component Division.
NOTE: Both filters are completely interchangeable.
CLEANING THE OUTDOOR AIR VENT FILTER
■
1. Remove the unit chassis from wall sleeve as
described in the General Disassembly section of
this manual. Refer to Remove the Unit from
the Wall Sleeve section.
2. Swing open vent door. The filter is located directly
behind the vent door. See Figure 22.
3. Once the filter is accessed, it may be cleaned using
either a vacuum cleaner, or a soft bristle brush
and a small amount of mild dish detergent. If
detergent is used, remove detergent residue with
a gentle, clean water stream. Allow the filter to air
dry.
REPLACING THE OUTDOOR AIR VENT FIL TER —
■
If vent filter requires replacement:
1. Open vent door to access vent filter.
2. Remove vent door from hinges.
3. Using needle nose pliers, remove vent cable from
vent door.
4. Using a small flat head screwdriver, pry the filter
from the partition.
5. Replace vent filter using Carrier Part No.
52CQ500144.
6. Reverse Steps 1-4 to re attach vent door and cable.
■
CHASSIS
Occasional cleaning of the e xterior surfaces of the
PTAC unit optimizes the unit’s appearance and
removes particles that may enter the air system. See
Figure 23. Mild detergents clean and reduce electrostatic charges on the plastic components of the PTAC
unit.
Use a clean cloth or brush to gently wipe exterior s urfaces. Be careful not to push dirt or other fibers into
the unit’s interior components. Accessible wall sleeve
surfaces should also be wiped clean.
10
SEASONAL CLEANING
VENT DOOR
OUTDOOR
AIR FILTER
The indoor and outdoor coils should be cleaned at least
once during every season. Refer to ACCESSING
UNIT COMPONENTS section to prepare unit.
CLEANING THE INDOOR AND OUTDOOR
■
COILS
Coil fins are sharp and may cut hands. Wear heavy
protective gloves when cleaning coils.
Use only cleaning solutions that meet local codes.
1. Use a vacuum cleaner or soft bristle brush to
remove surface fibers and dirt from the interior
surface of evaporator coil and both surfaces of condenser coil. See Figure 24. It is important to apply
the tool in the same direction of the fins, not
against them. Applying the tool against the fins
may cause damage (fin edges may bend over).
2. With a tank sprayer or a trigger spray extension
tube, spray coil cleaning solution evenly across the
coils, making sure coils are thoroughly saturated.
See Figure 25. Refer to instructions on the cleaning solution containers for best results.
use a high-pressure sprayer.
3. Rinse the coils thoroughly with low-velocity, clean
warm water (less than 200 F).
4. Repeat steps 2 and 3 for each coil surface.
5. Drain water and cleaning solution that may have
collected in the basepan during the cleaning process by carefully tilting the chassis. This allows
excess water to flow out of the overflow notches.
Do not
Do not set unit on end to drain water from basepan,
or at any other time. Oil will drain from the compressor sump, which could cause compressor failure.
6. Thoroughly cl ean the b asepan a nd drain p assages
by rinsing with clean water. Be sure all debris is
removed from the drain valve. See Figure 26.
7. Thoroughly cle an outdoor fan assembly and all
other mechanical components located in outdoor
coil area. Be sure to remove all dirt and debris.
8. Clean wall sleeve.
CLEANING THE INDOOR FAN AND FAN
■
SCROLL —
Dried debris and build-up on the blower
wheel and fan scroll can reduce the efficiency of the
unit.
ACCESS AND CLEAN INDOOR FAN AND
1.
FAN SCROLL
a. Reach behind the indoor coil and vacuum any
loose debris from the condensat e drai n pan, fan
and other areas accessible to the fan scroll,
being careful to avoid damage to the coil fins.
b. Use mild detergent and a damp cl oth to remov e
stubborn debris from surfaces around scroll and
fan blades.
CLEAN HEATER ASSEMBLY
2.
— Use compressed air to blow off any dirt or dust that has
accumulated on the heater coils.
NOTE: Do not direct air at the bi-metal discs on
the temperature limiter switches.
FIGURE 21 — LOCATION OF
TWO-PIECE INDOOR FILTER
FIGURE 22 — LOCATION OF OUTDOOR AIR
VENT FILTER
11
52C,P
SERIES
FIGURE 23 — PTAC EXTERIOR SURFACES
FIGURE 25 — CLEANING COILS
FIGURE 24 — VACUUMING EVAPORATOR COIL
DRAIN VALVE
FIGURE 26 — BASEPAN SECTION
12
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