Carrier 38HQ 18-24 Installation, Start-Up And Service Instructions Manual

1-6 nominal tons condensing units (50/60 hz)

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Insta

llation,

Start-

ervice I

Instruct

and

tions

SAFETY CONSIDERATIONS

Install and servicing air-conditioning equipment

can be hazardous due to system pressure and

electrical components. Only trained and qualified

service personnel should install or service air-

conditioning equipment untrained personnel may

perform basic maintenance such as cleaning and

replacing filters. All other operations should be

performed by trained service personnel. When

working on air conditioning equipment, observe

safety precautions in literature, and on tags and

labels attached to unit. Follow all safety codes.

Wear safety glasses and work gloves. Use

quenching cloth for brazing operations. Have a fire

extinguisher available. Read these instructions

thoroughly. Consult local building codes and

National Electrical Code (NEC) for special

installation requirements.

CONTENTS

SAFETY CONSIDERATIONS .................................... .

INSTALLATION .......................................................

Step 1 — Complete Pre-Installation Checks ...............

• UNPACK UNIT.......................................................

• INSPECT SHIPMENT..............................................

• CONSIDER SYSTEM REQUIREMENTS......................

Step 2 — Rig and Mount Unit .................................

• MOUNTING ON GROUND.......................................

• MOUNTING ON WALL...........................................

• MOUNTING ON ROOF.............................................

• RIGGING..............................................................

Step 3 — Complete Refrigerant Piping Connections ...

• MAKE PIPING SWEAT CONNECTIONS......................

• PROVIDE SAFETY RELIEF.....................................

Step 4 — Make Electrical Connections ....................

• POWER WIRING...................................................

• CONTROL CIRCUIT WIRING....................................

• CONNECTIONS TO DUCT-FREE FAN COIL UNITS........

Step 5 — Accessory Installation...............................

START-UP........................................................................

SERVICE ............................................................

MAINTENANCE ..................................................

WIRING DIAGRAMS..............................................

TROUBLESHOOTING ........................................... .

38HK 18-70

38HQ 18-24

al Tons.

1-6 Nomin

Condensing Units

(50/60 Hz)

Page

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Page 1 38HK 18-70 38HQ 18-24 al Tons. 1-6 Nomin Condensing Units (50/60 Hz) Insta llation, Start- ervice I Instruct tions SAFETY CONSIDERATIONS Install and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified...
Page 2: Base Unit Dimensions
Base Unit Dimensions 38H 018-036...
Page 3 Base Unit Dimensions 38H 048-070 UNIT 38H Ft-in. Ft-in. Ft-in. Ft-in. Ft-in. Ft-in. Ft-in. Ft-in. 048-070 3-13⁄16 944.6 3-89⁄16 1131.9 1-51⁄16 433.4 1-67⁄16 468.3 2-61⁄2 774.7 1-75⁄8 498.5 1-75⁄8 498.5 2-55⁄8 752.5 NOTES: 1. Required clearances: with coil facing wall allow 8 in.
Page 4: Physical Data
Physical Data UNIT 38H NOMINAL CAPACITY (Tons) OPERATING WEIGHT (lb) SHIPPING DIMENSIONS (in) (W X H X D) 37 x 29.7 x 16.1 50.4 X 40.2 X 30 COMPRESSOR Scroll Cool Only Reciprocating Heat Pump Rotary REFRIGERANT TYPE METERING DEVICE Ducted Application Nozzle, in the indoor unit Un-ducted Application...
Page 5: Electrical Data
Electrical Data COOL ONLY MODELS Compressor Nominal Cap. OUTDOOR MODEL Power Supply MBtuh 38HKC018US70 220-240/1/50 51.0 38HKR018US70 220-240/1/50 51.0 38HKC018DS70 220-240/1/50 51.0 38HKC018US70 220-240/1/50 51.0 38HKR018US70 220-240/1/50 51.0 38HKC024US70 220-240/1/50 14.0 58.0 38HKR024US70 220-240/1/50 14.0 58.0 38HKC024DS70 220-240/1/50 14.0 58.0 38HKC030US70 220-240/1/50 13.4...
Page 6: Installation
around the unit for air flow clearance, wiring, INSTALLATION refrigerant piping and servicing. The unit should Step 1 — Complete Pre-Installation Checks not be installed near to any source of heat, steam UNPACK UNIT—Move unit to final location. Remove or any flammable gas. carton from unit, being careful not to damage service Step 3—Complete Refrigerant Piping valves or grilles.
Page 7: Step 4 - Make Electrical Connections
Such operation will insulation on vapor tube and do not transmit invalidate any applicable Carrier warranty. vibration to the structure. Also, when passing refrigerant tubes through the wall, seal opening POWER WIRING—Unit is factory-wired for so that vibration is not transmitted to structure.
Page 8: Maximum Line Lengths
Evacuate and Dehydrate— Field piping and fan coil must be evacuated and dehydrated Internal Current and Temperature by either of the methods described in Carrier Sensitive Overload— Control resets Standard Service Techniques Manual, Chapter automatically when internal compressor motor 1, Section 1-7.
Page 9: Maintenance
See Table 1 pressure compressor restarts. for oil recharge and refer to Carrier Standard Service Techniques Manual, Chapter 1, pages 1 CAUTION to 21 for oil recharging procedure.
Page 10 Typical Wiring Schematic 38HK 18-36- 50Hz 220-240V/1Ph 24V Control 220-240V/1Ph 220V Control...
Page 11 Typical Wiring Schematic 38HK- 48-60 50Hz 400V/3Ph 24V Control 400V/3Ph 220V Control...
Page 12: Typical Wiring Schematic
Typical Wiring Schematic 38HK- 70 50Hz 400V/3Ph 24V Control...
Page 13 Typical Wiring Schematic Heat Pump 38HQ18-24...
Page 14 Typical Wiring Schematic 38HK 18-36- 60Hz 220-240V/1Ph 24V Control 220-240V/1Ph 220V Control...
Page 15 Typical Wiring Schematic 38HK- 48-70- 60Hz 220V/1Ph 24V Control 220V/1Ph 220V Control...
Page 16 Typical Wiring Schematic 38HK- 48-70- 60Hz – Cont 220V/3Ph 24V Control 220V/3Ph 220V Control...
Page 17 Typical Wiring Schematic Heat Pump 38HQ18-24...
Page 18: Start-Up Checklist
START-UP CHECKLIST...
Page 19: Pre-Start-Up
Outdoor Unit: Model Number ________________ Serial Number ____________________ Indoor Unit: Model Number __________________ Serial Number ____________________ PRE-START-UP Outdoor Unit IS THERE ANY SHIPPING DAMAGE? (Y/N) ___________________ IF SO, WHERE? ____________________________________________ WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) _____ CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT DATAPLATE? (Y/N) _____ HAS THE GROUND WIRE BEEN CONNECTED? (Y/N) _____ HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? (Y/N) _____...
Page 20 START-UP A. Check Indoor Fan Operation Under Ceiling Fan Coil Units SELECT FAN MODE, THEN INITIATE TEST SEQUENCE. DOES THE FAN COIL UNIT START AT LOW SPEED, THEN SHIFT TO MEDIUM SPEED, AND THEN SHIFT TO HIGH SPEED? (Y/N) _____ Cassette Fan Coil Units POSITION SELECTOR SWITCH AT SUBBASE IN EACH FAN SPEED SETTING IN SEQUENCE.
Page 21 Appendix...
Page 22: Long-Line Guideline
** Required on Heat Pumps only. This Long-Line Application Guideline applies • Any indoor furnace coil/fan coil not listed in to all Carrier residential air conditioner and outdoor unit presale literature heat pump split systems that have a nominal • Any application which has interconnecting capacity of 18,000 to 60,000 Btuh.
Page 23 vapor-line size from Table 2. Subtract the EXAMPLE: nominal percentage loss from outdoor-unit An 042 size heat pump is 75 ft above an 042 size presale-literature Detailed Cooling Capacities fan coil. The 042 size heat-pump presale literature data for the given indoor/outdoor combination. specifies a size 80 indoor piston and size 63 outdoor piston.
Page 24 Step 5—Charging Information Weigh in appropriate refrigerant charge, then EXAMPLE: use the standard practices of superheat- To calculate additional charge required for a 25–ft charging method for piston applications and line set: 25 ft – 15 ft subcooling-charging method = 10 ft X 0.6 oz/ft = 6 oz of additional charge applications to confirm correct charge.
Page 25 90° STD 45° STD Fig.1—Tube Bend Losses Table 3—Fitting Losses in Equivalent Ft TUBE SIZE OD REFERENCE DIAGRAM IN FIG. 1 (IN.) 1-1/8...
Page 26 Table 4 - Calculation of Indoor Piston No. OUTDOOR UNIT ABOVE INDOOR PISTON CHANGE 0-25 26-50 51-75 76-100 101-125 126-150 OUTDOOR UNIT BELOW INDOOR PISTON CHANGE 0-25 26-50 Table 5 — Calculation of Outdoor Piston No. OUTDOOR UNIT ABOVE INDOOR PISTON CHANGE 0-50 51-75...
Page 27 175' MAX. GROUND LEVEL Note: For Rotary Compressor, maximum length is 105'. BASEMENT Fig. 2—Application with Air Conditioner Installed in a Horizontal Configuration 175' MAX. GROUND LEVEL Note: For Rotary Compressor, maximum length is 105'. BASEMENT Fig. 3—Application with Heat Pump Installed in a Horizontal Configuration...
Page 28 TRAP 50' MAX. HEAT PUMP ONLY GROUND LEVEL Note: For Rotary Compressor, maximum height is 30'. Fig. 4-Application with Air Conditioner or Heat Pump Installed with Indoor Unit above Outdoor Unit...
Page 29 HEAT PUMP ONLY Note: For Rotary Compressor, 150' MAX. maximum height is 90'. Fig. 5—Application with Air Conditioner or Heat Pump Installed Above Indoor Unit...
Page 30 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations 38HK-02 IOM 2011...

Carrier 38HQ 18-24 Installation, Start-Up And Service Instructions Manual

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