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SERVICE TECHNICIAN GUIDE
SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
CONTENTS
Page
INTRODUCTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2,3
SUMMARY OF DANGERS, WARNINGS, AND CAUTIONS
. . .
2
GENERAL DISASSEMBLY
. . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
TO DISCONNECT POWER FOR CORD-CONNECTED UNIT
. .
4
TO DISCONNECT POWER FOR PERMANENTLY
CONNECTED (HARDWIRED) UNITS
. . . . . . . . . . . . . . . . . . .
4
TO OPEN THE CONTROL BOX
. . . . . . . . . . . . . . . . . . . . . . .
4
TO REMOVE THE UNIT FROM THE WALL SLEEVE
. . . . . . . .
4
TO REMOVE THE LATERAL DUCT EXTENSION, FOR
UNITS EQUIPPED WITH THE LATERIAL DUCT
ACCESSORY PACKAGE
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
TO ACCESS INDOOR-AIR SECTION COMPONENTS
. . . . . . .
6
TO ACCESS OUTDOOR-AIR SECTION COMPONENTS
. . . . . .
8
GENERAL CLEANING
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-15
CLEANING AND SAFETY
. . . . . . . . . . . . . . . . . . . . . . . . . .
10
TOOLS NEEDED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
MONTHLY CLEANING
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
SEASONAL CLEANING
. . . . . . . . . . . . . . . . . . . . . . . . . . .
13
COMPRESSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16-21
COMPRESSOR TROUBLESHOOTING
. . . . . . . . . . . . . . . . . .
17
BASIC HERMETIC COMPRESSOR ELECTRICAL
MEASUREMENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
COMPRESSOR REPLACEMENT
. . . . . . . . . . . . . . . . . . . . . .
19
Page
HEATERS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22,23
COMMON CAUSES OF HEATER FAILURE
. . . . . . . . . . . . . .
22
HEATER REMOVAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
OPERATING CONTROLS
. . . . . . . . . . . . . . . . . . . . . . . . .
24-31
DESCRIPTION OF SWITCH SETTINGS
. . . . . . . . . . . . . . . . .
25
NON-USER ADJUSTABLE SWITCHES
. . . . . . . . . . . . . . . . .
25
SEQUENCE OF OPERATION
. . . . . . . . . . . . . . . . . . . . . . . .
26
COMPONENT OPERATION AND TROUBLESHOOTING
. . . .
27
ELECTRICAL COMPONENTS REMOVAL AND
REPLACEMENT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
FAN MOTOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32-34
FAN MOTOR TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . .
32
BASIC FAN MOTOR ELECTRICAL TESTS
. . . . . . . . . . . . . . .
32
FAN MOTOR REPLACEMENT
. . . . . . . . . . . . . . . . . . . . . . .
34
FIELD TEMPERATURE CHARTS
. . . . . . . . . . . . . . . . . . . .
35-50
WIRING SCHEMATICS
. . . . . . . . . . . . . . . . . . . . . . . . . . .
51-55
MOST FREQUENT PTAC SERVICE QUESTIONS
. . . . . . . . . .
56
52S
SERIES
PTAC Customer Support Center
1 800 894 6449 INTRODUCTION
The focus of this manual is to provide basic information
on service procedures, safety, troubleshooting, clean-
ing, and component replacement for service technicians.
It is intended for use only by HVAC service tech-
nicians who have successfully completed instruc-
tion and received Type I Certication 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 in-
stall, operate, adjust, repair, or dismantle any equipment
should be made until the manufacturers instructions
are read and thoroughly understood by the service tech-
nician. Even equipment that seems familiar may have
specic model differences from year to year. Always
review manufacturers instructions.
The Model 52S packaged terminal air conditioner and
heat pump units are self-contained for installation
through the wall for individual room heating and cool-
ing. The Model 52S polymer sleeve is permanently
fastened to the wall; the unit chassis slides out of the
sleeve to allow the service technician easy access. An
accessory louvered rear grille may be mounted on the
sleeve. Many accessories are offered to complement the
units comfort control.
Before beginning any service procedures, it is important
to check the unit model number. Even units that seem
similar may have subtle differences that could affect
service procedures. The 52S units covered in this book
are the 52SC (Cooling Only model); the 52SE (Cooling
with Electric Heat model); and the 52SQ (Cooling, Elec-
tric Heat, and Heat Pump model).
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 information plate
beneath the front panel of the unit. The data infor-
mation plate also lists voltage ranges and other impor-
tant electrical information about the unit. To access
the data information plate, remove the front panel of
unit by grasping panel on each side and gently pulling
upward and out (Figure 1). See Figure 2 for model num-
ber nomenclature and Figure 3 for a sample data infor-
mation plate.
SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS
The terms DANGER, WARNING, and CAUTION
have specic meanings that identify the degree of haz-
ard. Typically in the HVAC industry, these specic
meanings are:
There is an immediate hazard which WILL result in
severe personal injury or death.
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 REMOVING FRONT PANEL
52S
SERIES
2 FIGURE 2 MODEL NUMBER NOMENCLATURE
FIGURE 3 SAMPLE DATA INFORMATION PLATE
3 GENERAL DISASSEMBLY
This section includes common procedures for disassem-
bly and reassembly of 52S units. These instructions
are general in nature and include procedures the tech-
nician may be called upon to perform when accessing
certain components of the 52S unit.
It is important to carefully follow manufacturers instruc-
tions when disassembling or reassembling a unit for
cleaning, maintenance, or part replacement. When dis-
assembling wiring, it is strongly recommended that
numbered stickers be attached to identify leads and ter-
minals to aid in the reassembly process. Always review
safety procedures prior to the start of a job.
Prior to servicing electrical equipment, disconnect all
power to avoid electric shock! Never alter cord or plug
and do not use extension cords.
TO DISCONNECT POWER FOR CORD-
CONNECTED UNIT
1. Push OFF button.
2. Open the disconnect switch at main power supply.
Use proper Lockout and Tag procedures.
3. Unplug the unit service cord.
TO DISCONNECT POWER FOR
PERMANENTLY CONNECTED
(HARDWIRED) UNITS
1. Push OFF button.
2. Open the disconnect switch at main power supply.
Use proper Lockout and Tag procedures.
3. Remove screw from access cover and remove ac-
cess cover.
4. Pull out the plug assembly and disconnect (see
Figure 4).
TO OPEN THE CONTROL BOX
The control box is factory wired. To open the control
box, remove the 2 screws on the front of the control box
and lower the front hinged panel. See Figure 5.
TO REMOVE THE UNIT FROM THE
WALL SLEEVE
1. Remove the four, 1
3 4
-in. mounting screws that se-
cure the unit to the wall sleeve. There are 2 screws
on each side (Figure 6).
2. Grasp the sides of the unit and slide it from the sleeve.
The chassis weighs between 110 and 150 pounds.
Take proper safety precautions to avoid personal in-
jury when lifting and moving the chassis.
The unit basepan may have water in it. Tilt the unit
back slightly when removing it from the sleeve to
drain some of the water into the sleeve.
.
.
CONTROL
BOX
ACCESS
COVER
PLUG
ASSEMBLY
FIGURE 4 DISCONNECTING PLUG
ASSEMBLY ON HARDWIRED UNITS
FIGURE 5 OPEN CONTROL BOX
FIGURE 6 UNIT TO WALL SLEEVE
MOUNTING SCREWS
52S
SERIES
4 TO REMOVE THE LATERAL DUCT
EXTENSION, FOR UNITS EQUIPPED
WITH THE LATERAL DUCT ACCESSORY
PACKAGE
1. Remove the front panel as shown in Figure 1.
2. Remove the four 1
3 4
-in. screws that secure the
chassis to the wall sleeve (see Figure 6). There are
2 screws on each side.
3. Remove the 2 screws that secure the lateral duct ex-
tension to the top of the lateral duct adapter as shown
in Figure 7.
4. Locate and remove the 2 screws that secure the
lateral duct extension to the bracket ange as shown
in Figure 8.
5. Carefully slide the chassis away from the extension
duct and remove from the sleeve (as shown in
Figure 9).
The unit basepan may have water in it. Tilt the unit
back slightly when removing it from the sleeve to
drain some of the water into the sleeve.
The chassis weighs between 110 and 150 pounds.
Take proper safety precautions to avoid personal in-
jury when lifting and moving the chassis.
FIGURE 7 DUCT EXTENSION SCREWS
FIGURE 8 BRACKET F