50HX
Single Packaged Heat Pump Units
Installation, Start-Up, and Operating Instructions
50HX Sizes 024-060
NOTE:
Read the entire instruction manual before starting the
installation.
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indicates a change since the last issue.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................1
Introduction ....................................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
Provide Unit Support ................................................................2
ROOF CURB & SLAB MOUNT.......................................2
Provide Clearances....................................................................2
Select and Install Ductwork .....................................................2
Rig and Place Unit....................................................................3
INSTALLATION ................................................................5
Connect Condensate Drain .......................................................6
Install Duct Connections ..........................................................7
CONFIGURING UNITS FOR DOWNFLOW (VERTI-
CAL) DISCHARGE-STANDARD UNITS (024–042)......8
CONFIGURING UNITS FOR DOWNFLOW (VERTI-
CAL) DISCHARGE-ECM UNITS (048–060) .................10
Install Electrical Connection ..................................................12
HIGH-VOLTAGE & CONTROL-VOLTAGE CONNEC-
TIONS................................................................................14
SPECIAL PROCEDURES FOR 208-V OPERATION ...15
PRE-START-UP ..........................................................................19
START-UP ...................................................................................19
CHECK FOR REFRIGERANT LEAKS..........................19
START UP AND MAKE ADJUSTMENTS....................20
CHECKING COOLING CONTROL OPERATION .......20
CHECKING HEATING CONTROL OPERATION........20
CHECKING
AND
ADJUSTING
REFRIGERANT
CHARGE ...........................................................................20
INDOOR
AIRFLOW
AND
AIRFLOW
ADJUST-
MENTS ..............................................................................23
For 208/230v-PSC Blower Motor.....................................23
For 208/230v-ECM Blower Motor ...................................23
COOLING SEQUENCE OF OPERATION .....................23
HEATING SEQUENCE OF OPERATION .....................25
MAINTENANCE.........................................................................25
AIR FILTER......................................................................25
UNIT TOP REMOVAL ....................................................26
INDOOR BLOWER AND MOTOR ................................26
OUTDOOR COIL, INDOOR COIL, AND CONDENSATE
DRAIN PAN......................................................................27
OUTDOOR FAN...............................................................30
ELECTRICAL CONTROLS AND WIRING ..................30
REFRIGERANT CIRCUIT...............................................30
INDOOR AIRFLOW ........................................................31
METERING DEVICE — ACUTROL DEVICE .............31
LIQUID LINE STRAINER ..............................................31
Troubleshooting............................................................................34
Start-Up Checklist ........................................................................36
NOTE TO INSTALLER — Before the installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User’s Manual and Replacement Guide are left with
the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters. All other operations should be performed
by trained service personnel. When working on air-conditioning
equipment, observe precautions in the literature, tags, and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations. Consult a qualified installer or
service agency for information or assistance. The qualified in-
staller or agency must use only factory-authorized kits or acces-
sories when modifying this product.
Fig. 1—Unit 50HX with Optional Base Rails
C95002
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
6
Ta
b
6 8
PC 101
Catalog No. 535–00101
Printed in U.S.A.
Form 50HX-5SI
Pg 1
7–03
Replaces: 50HX-4SI
