Carrier 50HJ015-025 Installation, Start-Up And Service Instructions Manual
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Carrier 50HJ015-025 Installation, Start-Up And Service Instructions Manual

Carrier 50HJ015-025 Installation, Start-Up And Service Instructions Manual

Single-package rooftop units electric cooling with electric heat option
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 1
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 1
• POSITIONING
• ROOF MOUNT
Step 3 - Field Fabricate Ductwork . . . . . . . . . . . . . . . 7
Step 4 - Make Unit Duct Connections . . . . . . . . . . . 7
Step 5 - Trap Condensate Drain . . . . . . . . . . . . . . . . . 7
Step 6 - Make Electrical Connections . . . . . . . . . . . 8
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• OPTIONAL NON-FUSED DISCONNECT
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
•
Step 8 - Install Outdoor-Air Hood . . . . . . . . . . . . . . 12
Step 9 - Install All Accessories. . . . . . . . . . . . . . . . . 15
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-33
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . .34,35
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions 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 extinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Book 1
4
Tab
1b 6b
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
Page
Catalog No. 535-00025
Single-Package Rooftop Units
IMPORTANT: Units have high ambient operating lim-
its. If limits are exceeded, the unit will automatically
lock the compressor out of operation. Manual reset will
be required to restart the compressor.

Step 1 - Provide Unit Support

ROOF CURB - Assemble and install accessory roof curb or
horizontal supply roof curb in accordance with instructions
shipped with the accessory. Accessory roof curb and horizontal
supply roof curb and information required to field fabricate a
roof curb or horizontal supply roof curb are shown in Fig. 1
and 2. Install insulation, cant strips, roofing, and counter flash-
ing as shown. Ductwork can be secured to roof curb before unit
is set in place.
IMPORTANT: The gasketing of the unit to the roof curb
or horizontal supply roof curb is critical for a leakproof
seal. Install gasket supplied with the roof curb or hori-
zontal supply roof curb as shown in Fig. 1. Improperly
applied gasket can result in air leaks and poor unit
performance.
Roof curb must be level. This is necessary to permit unit
drain to function properly. Unit leveling tolerance is ±
per linear ft in any direction. Refer to Accessory Roof Curb or
Horizontal Supply Roof Curb Installation Instructions for addi-
tional information as required.
ALTERNATE UNIT SUPPORT - When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 4-in. x 4-in.
pads on each side.
Step 2 - Rig and Place Unit -
transportation damage. File any claim with transportation
agency. Keep unit upright, and do not drop. Use spreader bars
over unit to prevent sling or cable damage. Rollers may be used
to move unit across a roof. Level by using unit frame as a refer-
ence; leveling tolerance is ±
tion. See Fig. 3 for additional information. Unit weight is
shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING - Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4 and 5).
Do not install unit in an indoor location. Do not locate air in-
lets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT - Check building codes for weight distribu-
tion requirements.
Printed in U.S.A.
Form 50HJ-19SI
50HJ015-025

INSTALLATION

Inspect
1
/
in. per linear ft in any direc-
16
Pg 1
3-01
Replaces: 50HJ-16SI
1
/
in.
16
unit
for

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Summary of Contents for Carrier 50HJ015-025

  • Page 1: Table Of Contents

    50HJ015-025 Single-Package Rooftop Units Electric Cooling with Electric Heat Option Installation, Start-Up and Service Instructions CONTENTS IMPORTANT: Units have high ambient operating lim- its. If limits are exceeded, the unit will automatically Page lock the compressor out of operation. Manual reset will SAFETY CONSIDERATIONS .
  • Page 3 DIMENSIONS MAXIMUM UNIT SHIPPING WEIGHT 50HJ ft-in. ft-in. 1625 6-11 2121 4- 0 1219 1700 6-11 2121 3-10 1168 NOTE: For preassembled horizontal adapter roof curb part 1800 6-11 2121 3- 7 1092 no. CRRFCURB013A00, the accessory kit includes a factory- NOTES: designed, high-static, regain transition duct.

  • Page 6: Roof Curb

    Table 1 — Physical Data UNIT 50HJ UNIT VOLTAGE 208/230 460 208/230 230 and 460 NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Unit Al/Al* 1575 1650 1750 Al/Cu* 1725 1800 1900 Cu/Cu* 1855 1930 2030 EconoMi$er Roof Curb† MoistureMiser Dehumidification Package COMPRESSOR Quantity...Model (Ckt 1, Ckt 2) 1...ZR72KC, 1...ZR57KC...

  • Page 7: Step 3 - Field Fabricate Ductwork

    Step 3 — Field Fabricate Ductwork — Step 4 — Make Unit Duct Connections — Secure all Unit is ducts to building structure. Use flexible duct connectors be- shipped for thru-the-bottom duct connections. Ductwork open- tween unit and ducts as required. Insulate and weatherproof all ings are shown in Fig.

  • Page 8: Step 6 - Make Electrical Connections

    Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to the installation in- structions included with the accessory. Locate thermostat as- sembly on a solid wall in the conditioned space to sense aver- Fig.
  • Page 9 Table 2 — Electrical Data NOMINAL COMPRESSOR VOLTAGE POWER ELECTRIC POWER UNIT VOLTAGE RANGE EXHAUST HEAT* SUPPLY No. 1 No. 2 50HJ (3 Ph, FLA (ea) MOCP† 60 Hz) — — — — 59/ 59 70/ 70 18.8 — — 64/ 63 80/ 80 —...
  • Page 10 LEGEND EXAMPLE: Supply voltage is 460-3-60. — Full Load Amps AB = 452 v HACR — Heating, Air Conditioning and Refrigeration BC = 464 v — Indoor (Evaporator) Fan Motor AC = 455 v LRA — Locked Rotor Amps MCA — Minimum Circuit Amps 452 + 464 + 455 Average Voltage = MOCP—...

  • Page 11: Optional Convenience Outlet

    Step 7 — Make Outdoor-Air Inlet Adjustments OPTIONAL NON-FUSED DISCONNECT — On units with the optional non-fused disconnect, incoming power will be MANUAL OUTDOOR-AIR DAMPER — All units (except wired into the disconnect switch. Refer to Fig. 13 for wiring those equipped with a factory-installed EconoMi$er) have a for 100 and 200 amp disconnect switches.

  • Page 12: Step 8 - Install Outdoor-Air Hood

    Table 4 — Heat Anticipator Settings hood side panels located on the sides of the outdoor-air inlet opening. UNIT UNIT STAGE 1 STAGE 2 6. Match notches in hood top panel to unit top panel screws. 50HJ VOLTAGES Insert hood flange between unit top panel flange and unit. 14/19 —...
  • Page 13 SENSOR OUTSIDE AIR SENSOR COVER Fig. 19 — Seal Strip Location (Air Hood Cross-Sectional View) BAFFLE (017 AND 025 ONLY) Fig. 21 — Outdoor-Air Sensor Location MOUNTING SCREW LOWER FILTER RETAINER FILTER SUPPORT BRACKET SENSOR WIRING CONNECTIONS MOUNTING HOOD SIDE SCREW PANELS (2) HOOD TOP...
  • Page 14 MECHANICAL COOLING LOCKOUT — Determine the DRY BULB CHANGEOVER SET UP — Determine the dry outdoor-air temperature at which you want the mechanical bulb changeover set point from Table 6. The settings are A, B, cooling (compressors) to be disabled. Locate the mechanical C and D.

  • Page 15: Step 9 - Install All Accessories

    VENTILATION AIR (Minimum Position Set Up) — If ven- tilation air is not required, skip this section. If ventilation air is required, perform the following: Personal Injury Hazard. Avoid possible injury by keep- 1. The indoor fan must be on to set the ventilation air. ing fingers away from damper blades.

  • Page 16: Motormaster Iii Control Installation

    MositureMiser dehumidification package operation can be Sensor — Install the sensor for thermistor input control in the controlled by field installation of a Carrier-approved humidis- location shown in Fig. 26. Connect sensor leads to the purple tat. To install the humidistat perform the following procedure: and grey control signal leads on the Motormaster III control.
  • Page 17 Fig. 28 — Typical MoistureMiser Dehumidification Package Control Box MOTORMASTER SENSOR LOCATION NOTES: 1. All sensors are located on the eighth hairpin up from the bottom. 2. Field-installed tubing insu- lation is required to be installed over the TXV bulb capillary tube proper operation at low...

  • Page 18: Start-Up

    START-UP Condenser Fans and Motors — Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustment Use the following information and Start-Up Checklist on section (page 29) as required. Be sure that fans rotate in the page CL-1 to check out unit PRIOR to start-up. correct direction.
  • Page 19 3. If Y1 is energized, and compressor no. 1 is already ener- As the warm liquid passes through the subcooler coils, it is gized (see Step 2) and the room thermostat calls for Y2, exposed to the cold supply airflow coming off the evaporator compressor no.
  • Page 20 Fig. 29 — MoistureMiser Operation Diagram...
  • Page 21 6. Use of a field-supplied motor may affect wiring size. Contact 1. Maximum continuous bhp for the standard motor is 3.13 (for your Carrier representative for details. 208/230 and 460-v units) or 3.38 (for 575-v units). The maxi- mum continuous watts is 2700 (for 208/230 and 460-v units) or 3065 (for 575-v units).
  • Page 22 3775. Do not adjust motor rpm 6. Use of a field-supplied motor may affect wiring size. Contact such that motor maximum bhp and/or watts is exceeded at the your Carrier representative for details. maximum operating cfm.
  • Page 23 5180. Do not adjust motor rpm 6. Use of a field-supplied motor may affect wiring size. Contact such that motor maximum bhp and/or watts is exceeded at the your Carrier representative for details. maximum operating cfm.
  • Page 24 6. Use of a field-supplied motor may affect wiring size. Contact maximum continuous watts is 7915 (for 208 and 575-v units) your Carrier representative for details. and 8640 (for 230 and 460-v units). Do not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the...
  • Page 25 Table 13 — Accessory/FIOP Static Pressure (in. wg) HEATER ELECTRIC HEATERS ECONOMI$ER UNIT RATED PRESSURE DROP PRESSURE 50HJ VOLTAGE* (kW) DROP 3,750 0.05 (14/19, 26/34) 0.06 (42/56) 0.07 (56/75) 0.03 4,000 0.05 (14/19, 26/34) 0.06 (42/56) 0.07 (56/75) 0.04 5,000 0.07 (14/19, 26/34) 0.08 (42/56) 0.10 (56/75)
  • Page 26 Table 15 — Fan RPM at Motor Pulley Settings* 50HJ 015 (208/230, 460 v)† †† †† †† †† 1064 1035 1006 †† †† †† †† 1426 1393 1360 1327 1294 1261 1227 1194 1161 015 (208/230, 460 v)** 015 (575 v)† ††...

  • Page 27: Service

    SERVICE Evaporator Performance Adjustment (Fig. 30-32) — Fan motor pulleys are factory set for speed shown in Table 1. To change fan speeds: Before performing service or maintenance operations on 1. Shut off unit power supply. unit, turn off main power switch to unit. Turn off accessory 2.
  • Page 28 4. Using jacking bolt under motor base, raise motor to top of slide and remove belt. Secure motor in this position by tightening the nuts on the carriage bolts. 5. Remove the belt drive. 6. Remove jacking bolt and tapped jacking bolt plate. 7.
  • Page 29 Condenser-Fan Adjustment EconoMi$er Adjustment 50HJ015 AND 017 UNITS (Fig. 33) LED INDICATION — The EconoMi$er controller features an onboard diagnostic LED (light-emitting diode) that flashes 1. Shut off unit power supply. to indicate its status. See Table 17 for flash codes. The control- 2.
  • Page 30 Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 1. Refer to Carrier GTAC ADD CHARGE IF ABOVE CURVE II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure.
  • Page 31 Optional Hinged Access Doors — OFF position to open the door. Two doors are provided for ac- When the optional cess to the compressor compartment. service package is ordered or the if the hinged access doors option is ordered, the unit will be provided with external and Two internal access doors are provided inside the filter/ internal hinged access doors to facilitate service.
  • Page 32 Fig. 36 — Typical Wiring Schematic (50HJ017, 460v Shown)
  • Page 33 Fig. 36 — Typical Wiring Schematic (50HJ017, 460v Shown) (cont) Fig. 37 — Typical Component Arrangement (50HJ017 Shown)

  • Page 34: Troubleshooting

    TROUBLESHOOTING Refer to Tables 18-20 for troubleshooting details. Table 18 — Cooling Service Analysis PROBLEM CAUSE REMEDY Compressor and Power failure. Call power company. condenser fan Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. will not start. Defective thermostat, contactor, transformer, or control Replace component.

  • Page 35: Troubleshooting

    Table 19 — EconoMi$er Troubleshooting PROBLEM POTENTIAL CAUSE REMEDY Damper Does Not Indoor (Evaporator) Fan is Check to ensure that 24 vac is present at Terminal C1 (Common Power) Open on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at the IFO (Indoor [Evaporator] Fan On) terminal.
  • Page 38 Copyright 2001 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 PC 111 Catalog No. 535-00025 Printed in U.S.A. Form 50HJ-19SI Pg 38 3-01 Replaces: 50HJ-16SI...

  • Page 40: Start-Up Checklist

    ECONOMI$ER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES Copyright 2001 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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