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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 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 in-
stall, operate, adjust, repair, or dismantle any equipment
should be made until the manufacturer’s instructions
are read and thoroughly understood by the service tech-
nician. Even equipment that seems familiar may have
specific model differences from year to year. Always
review manufacturer’s 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
unit’s 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 specific meanings that identify the degree of haz-
ard. Typically in the HVAC industry, these specific
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