50ZH030-060
3-Phase Packaged Heat Pump
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installation, Start-Up and Service instructions
HEATING & COOLING
NOTE: Read the entire instruction manual belk_re starting the
installation.
TABLE OF CONTENTS
SAFETY CONS1 f)ERATIONS ..................................................... ]
INTRODUCTION .......................................................................... 2
RECEIVING AND INSTALLATION .......................................... 2
Check Equipn_ent ...................................................................... 2
IDENTIFY UNIT ................................................................ 2
INSPECT SHIPMENT ........................................................ 2
Provide Unit Support ................................................................ 2
SLAB MOUNT ................................................................... 2
GROUND MOUNT ............................................................ 2
Provide Clearances .................................................................... 2
Place Unit .................................................................................. 2
Select and Install Ductwork ..................................................... 2
INSTALL FLANGES FOR DUCTWORK CONNEC-
TIONS (50ZH060 ONLY) .................................................. 2
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE ...................... 6
Provide liar Condensate Disposal ............................................. 6
Install Electrical Connections ................................................... 7
HIGH-VOLTAGE CONNECTIONS .................................. 7
ROUTING POWER LEADS INTO UNIT ........................ 7
CONNECTING GROUND LEAD TO UNIT GROUND.7
ROUTING CONTROL POWER WIRES .......................... 7
ACCESSORY ELECTRIC HEAT WIRING ..................... 7
SPECIAL PROCEDURES FOR 208-V OPERATION .....7
PRE-START-UP ............................................................................ 9
START-UP ..................................................................................... 9
Check lor Refi"igerant Leaks .................................................... 9
LOCATE AND REPAIR REFRIGERANT LEAKS AND
CHARGE THE UNIT AS FOLLOWS: ............................. 9
Start-Up Cooling Section and Make Adjustnlents ................ 10
CHECKING COOLING CONTROL OPERATION ....... 10
COMPRESSOR ROTATION ........................................... 10
Refrigerant Charge .................................................................. 10
NO CHARGE .................................................................... 10
LOW CHARGE COOLING ............................................. 10
TO USE THE COOLING CHARGING CHART ............ 11
HEATING MODE CHARGE ........................................... 11
Indoor Airflow and Airflow Adjustn-ients .............................. IX
FOR 208/230-V ................................................................. 11
FOR 460-V MOTORS ...................................................... 11
Unit Controls ........................................................................... l l
HIGH-PRESSURE RELIEF VALVE ............................... IX
LOSS OF CHARGE SWITCH ......................................... 11
COMPRESSOR OVERLOAD .......................................... 11
Sequence of Operation ............................................................ 14
FAN OPERATION ............................................................ 14
COOLING .......................................................................... 14
HEAT PUMP HEATING .................................................. 14
DEFROST .......................................................................... 14
ELECTRIC RESISTANCE HEATING ............................ 14
C00155
Fig. 1--Unit 50ZH
MAINTENANCE ......................................................................... 14
Air Filter .................................................................................. 16
Unit Top Removal (Outdoor-Coil Side) ................................ 16
Indoor Blower and Motor ....................................................... 16
Outdoor Coil, Indoor Coil and Condensate Drain Pan ........ 17
Outdoor Fan ............................................................................ 19
Electrical Controls and Wiring ............................................... 19
ReliTigerant Circuit .................................................................. 19
Indoor Airflow ........................................................................ 19
Metering Devices .................................................................... 19
Lubrication .............................................................................. 19
Liquid Line Strainer ................................................................ 19
High Flow Valves ................................................................... 19
TROUBLESHOOTING ............................................................... 22
START-UP CHECKLIST ............................................................ 23
NOTE TO 1NSTALLER--Beli_re installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User's Manual and Replacement Guide are leli with
the unit alier installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified workers should install, repair, or service
air-conditioning equipment.
Untrained workers can perlimn basic maintenance hlnctions of
cleaning coils and l]lters. All other operations should be perlormed
by trained service people. When working on air-conditioning
equipment, pay attention to precautions in the literature, tags, and
labels attached to the unit, and other sali_ty precautions that may
apply.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 101 Printed in U.S.A. Catalog No. 50ZH-6SI Pg 1 2-06 Replaces: New
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