Table of Contents
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NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION ..........................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
Provide Unit Support ................................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Rig and Place Unit....................................................................2
INSPECTION ......................................................................2
INSTALLATION ................................................................3
Select and Install Ductwork .....................................................5
DOWNFLOW (VERTICAL) DISCHARGE UNITS.........5
Provide for Condensate Disposal .............................................7
Install Electrical Connections...................................................8
HIGH-VOLTAGE CONNECTIONS..................................9
ROUTING POWER LEADS INTO UNIT ........................9
CONNECTING GROUND LEAD TO GROUND LUG ..9
ROUTING CONTROL POWER WIRES (24-V) ..............9
PRE-START-UP ............................................................................9
START-UP ...................................................................................10
Check for Refrigerant Leaks ..................................................10
Start-Up Adjustments..............................................................10
CONTROL OPERATION.................................................12
CHARGE ...........................................................................12
REFRIGERANT CHARGE ..............................................12
NO CHARGE ....................................................................12
LOW CHARGE COOLING .............................................12
TO USE COOLING CHARGING CHARTS ..................13
MENTS ..............................................................................13
MAINTENANCE.........................................................................14
Air Filter..................................................................................16
Indoor blower and motor........................................................16
CONDENSATE DRAIN PAN...............................................16
Outdoor fan .............................................................................16
Electrical controls and wiring ................................................17
Refrigerant circuit ...................................................................17
Indoor airflow .........................................................................17
Metering device ......................................................................18
Liquid line strainers ................................................................18
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Tab 6 8
Installation, Start-Up,
and Service Instructions
Printed in U.S.A.
Catalog No. 50SZ-1SI
Single-Packaged Heat Pump Units
Fig. 1-Model 50SZ
High Flow Valves...................................................................18
Time-delay relay .....................................................................18
Loss of charge switch.............................................................18
Check defrost thermostat ........................................................18
Defrost Thermostat .................................................................18
TROUBLESHOOTING ...............................................................18
START-UP CHECKLIST............................................................18
NOTE TO INSTALLER - READ THESE INSTRUCTIONS
CAREFULLY AND COMPLETELY before installing this unit.
Also, make sure the Owner's Manual and Service Instructions 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.
Pg 1
50SZ
C99001
8-05
Replaces: New
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Summary of Contents for Carrier 50SZ Series
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Page 1: Table Of Contents
Select and Install Ductwork .............5 CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE UNITS..5 C99001 Provide for Condensate Disposal ..........7 Fig. 1—Model 50SZ Install Electrical Connections...........8 HIGH-VOLTAGE CONNECTIONS........9 High Flow Valves..............18 ROUTING POWER LEADS INTO UNIT ......9 Time-delay relay ..............18 CONNECTING GROUND LEAD TO GROUND LUG ..9... -
Page 2: Introduction
INTRODUCTION Do not place the unit where water, ice, or snow from an overhang The 50SZ heat pump is fully self-contained and designed for or roof will damage or flood the unit. Do not install the unit on outdoor installation (See Fig. 1). Standard units are shipped in a carpeting or other combustible materials. -
Page 3: Installation
REQUIRED CLEARANCE FOR OPERATION AND SERVICING REQUIRED CLEARANCE TO COMBUSTIBLE MATL. INCHES [mm] (R efer to M aximum O perating C learances ) EVAP. COIL ACCESS SIDE............36.00 [914.0] INCHES [mm] POWER ENTRY SIDE..............42.00 [1066.8] TOP OF UNIT...................14.00 [355.6] (EXCEPT FOR NEC REQUIREMENTS) DUCT SIDE OF UNIT.................2.00 [50.8] SIDE OPPOSITE DUCTS ..............14.00 [355.6] UNIT TOP ..................48.00 [1219.2]... - Page 4 REQUIRED CLEARANCE TO COMBUSTIBLE MATL. REQUIRED CLEARANCE FOR OPERATION AND SERVICING INCHES [mm] (R efer to M aximum O perating C learances ) EVAP. COIL ACCESS SIDE............36.00 [914.0] INCHES [mm] POWER ENTRY SIDE..............42.00 [1066.8] TOP OF UNIT...................14.00 [355.6] (EXCEPT FOR NEC REQUIREMENTS) DUCT SIDE OF UNIT.................2.00 [50.8] UNIT TOP ..................48.00 [1219.2] SIDE OPPOSITE DUCTS ..............14.00 [355.6]...
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Page 5: Select And Install Ductwork
C00071 50SD CORNER # TOTAL WEIGHT Fig. 4—Corner Weights (in Pounds) Step 5—Select and Install Ductwork resistant duct connector (or sheet metal sleeve) must extend 24-in. from electric heater element. The design and installation of the duct system must be in 3. - Page 6 HVAC unit HVAC unit base base Gask eting inner flange* Scre w Scre w Gask eting (NO TE A) (NO TE A) inner flange* *Gask eting *Gask eting outer flange outer flange Wood nailer* Wood nailer* Flashing field Flashing field supplied supplied Roofcurb*...
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Page 7: Provide For Condensate Disposal
C99075 Step 6—Provide for Condensate Disposal MAXIMUM WEIGHT SIZE NOTE: Ensure that condensate-water disposal methods comply with local codes, restrictions, and practices. UNIT 50SZ The units dispose of condensate through a 3/4 in. NPT female 20.0 508.0 19.3 490.2 fitting that exits on the compressor end of the unit. Condensate 20.0... -
Page 8: Install Electrical Connections
Horizontal Duct Covers ELECTRICAL SHOCK HAZARD C99030 Failure to follow this warning could result in personal injury Fig. 10—50SZ with Duct Covers On or death. (Unit Shown with Optional Louvered Grille) The unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. -
Page 9: High-Voltage Connections
SPECIAL PROCEDURES FOR 208-V OPERATION 1. Disconnect the yellow primary lead from the transformer. See INSTALLATION REQUIREMENTS unit wiring label (See Fig. 12). Failure to follow these precautions could result in damage to 2. Connect the yellow primary lead to the transformer terminal the unit being installed: labeled 200-v. -
Page 10: Start-Up
Table 3—Electrical Data—50SZ (Single Point Connection) VOLTAGE COMPRESSOR ELECTRIC HEAT POWER SUPPLY RANGE UNIT 50SZ V-PH-HZ Max Fuse SIZE Nominal Kw MOCP Ckt Bkr 16.5/16.5 20/20 — 3.8/5.0 18.1/20.8 25.1/28.5 30/30 — 208/230–1–60 10.9 54.0 7.5/10.0 36.1/41.7 47.6/54.6 50/60 —... - Page 11 A05140 Fig. 12—Wiring Schematics (208/230-1-60)
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Page 12: Checking Cooling And Heating Control Operation
FAN GRILLE MOTOR 1/2˝ 1/8" MAX BETWEEN MOTOR SHAFT MOTOR AND FAN HUB C99009 Fig. 16—Fan Blade Clearance CHECKING COOLING AND HEATING CONTROL OPERATION Start and check the unit for proper control operation as follows: THERMOSTAT UNIT CONTROL POWER AND SUBBASE SPLICE BOX 1. -
Page 13: To Use Cooling Charging Charts
INDOOR COIL OUTDOOR COIL Bypass Position Metering Position LEGEND HPS – High Pressure Switch LCS – Loss of Charge Switch Accurater ® Metering Device Arrow indicates direction of flow C00095 Fig. 17—Typical Heat Pump Operation, Heating Mode INDOOR COIL OUTDOOR COIL Metering Position Bypass... -
Page 14: Maintenance
Fig. 19—50SZ Balance Point Worksheet Unit 50SZ three-speed motors are factory wired for low speed operation. Unit 50SZ 030 is factory wired for medium speed. Unit FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD 50SZ 018 has a two-speed motor wired for low speed. - Page 15 Table 5—Wet Coil Air Delivery Unit 50SZ 024-060 (Deduct 10 percent for 208-V)* 230 VOLT External Static Pressure (in. wg) Motor Unit Speed Watts — — — — — — — — — — Watts — — — — —...
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Page 16: Air Filter
Table 7—ELECTRIC HEAT PRESSURE DROP TABLE Small Cabinet STATIC 1000 1100 1200 1300 1400 1500 1600 5 kw 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 10 kw 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 0.09 0.10... -
Page 17: Electrical Controls And Wiring
2. If fan needs to be removed, remove screws holding outdoor air Step 6—Refrigerant circuit intake grille and remove grille. Inspect all refrigerant tubing connections and the unit base for oil 3. Loosen the setscrew and slide the fan off the motor shaft. accumulation annually. -
Page 18: Metering Device
Step 8—Metering device Refrigerant metering devices are fixed orifices and are located in the inlet header to the indoor and outdoor coils. Step 9—Liquid line strainers The liquid line strainers (to protect metering devices) are made of wire mesh and are located in the liquid lines on the inlet side of the metering devices. - Page 19 Table 9—Cooling and Heating Troubleshooting Chart SYMPTOM CAUSE REMEDY Power Failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat, contractor, transformer, Replace component control relay or defrost board Insufficient line voltage Determine cause and correct Compressor and outdoor Incorrect or faulty wiring...
- Page 20 ____ Verify Refrigerant charge using charging tables Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.