IMPORTANT — READ BEFORE INSTALLING
1. Read and become familiar with these installation in-
structions before installing this unit (Fig. 1).
2. Be sure the installation conforms to all applicable local
and national codes.
3. These instructions contain important information for the
proper maintenance and repair of this equipment. Re-
tain these instructions for future use.
CONTENTS
Page
SAFETY CONSIDERATIONS ........................1
INSTALLATION ................................1-17
I. Locate the Unit .............................1
II. Unit Duct Connections ......................3
III. Rig and Place Unit ..........................3
IV. Field Connections ..........................8
PRE-START-UP .................................18
START-UP ....................................18-24
I. Heating Section Start-Up and Adjustments ....18
II. Cooling Section Start-Up and Adjustments ....20
III. Indoor Airflow and Airflow Adjustments .......21
CARE AND MAINTENANCE .....................24,25
I. Air Filter ..................................25
SERVICE .....................................25-27
I. Cleaning .................................25
II. Lubrication ...............................26
III. Outdoor-Fan Adjustment ....................26
IV. Refrigerant Charge .........................26
V. Replacement Parts .........................26
TROUBLESHOOTING ...........................28-30
SAFETY CONSIDERATIONS
Recognize safety information. This is the safety-alert symbol
( ). When you see this symbol on the unit and in instruc-
tions or manuals, be alert to the potential for personal
injury.
Understand the signal words — DANGER, WARNING and
CAUTION. These words are used with the safety-alert sym-
bol. Danger identifies the most serious hazards which will
result in severe personal injury or death. Warning indicates
a condition that could result in personal injury. Caution is
used to identify unsafe practices which would result in minor
personal injury or product and property damage.
WARNING:
Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit. Electrical shock could cause personal injury.
1. The power supply (volts, hertz, and phase) must corre-
spond to that specified on unit rating plate.
2. The electrical supply provided by the utility must be suf-
ficient to handle load imposed by this unit.
3. Refer to Locate the Unit section on this page and Fig. 2
for locations of electrical inlets, condensate drain, duct
connections, and required clearances before setting unit
in place.
4. This installation must conform with local building codes.
Refer to local plumbing or wastewater codes and other
applicable local codes.
5. Approved for outdoor installation on wood flooring
or on class A, B, or C (U.S.A. Standard) roof covering
materials.
INSTALLATION
Unit is shipped in the vertical airflow configuration (see Fig.
1). To convert to horizontal discharge, remove horizontal duct
opening covers. Using the same screws, install covers with
insulation-side down (facing outside) on the unit over verti-
cal duct openings. Seals around duct openings must be tight.
All units can be connected into existing duct systems that are
properly sized and designed to handle an airflow of 142 to
236 L/s (300 to 500 cfm) per each 3.5 kW (12,000 Btuh) of
rated cooling capacity.
NOTE: When installing any accessory item, see the manu-
facturer’s installation instructions packaged with the acces-
sory. A qualified installer or agency must use only factory-
authorized kits or accessories when modifying this unit.
I. LOCATE THE UNIT
A. Clearance
Maintain clearance around and above unit to provide proper
airflow and service access (see Fig. 2 and 3).
Aminimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal dis-
charge units, a minimum clearance of 25 mm (1 in.) is re-
quired for the first 305 mm (12 in.) of ductwork.
Fig.1—Typical Unit
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
HEAT PUMP UNITS
548C (50 Hz)
Sizes 090,120
Nominal Capacities:
23.1, 28.7 kW
(6.6, 8.2 Tons)
Cancels: New IIE 548C-90-1
2/15/92
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