Carrier 50TJ016-028 Installation, Start-Up And Service Instructions Manual
Single-package rooftop units electric cooling with electric heat option
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Table of Contents
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . . . . . .1
• ROOF CURB
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
• OPTIONAL NON-FUSED DISCONNECT
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Step 8 - Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . .12
Step 9 - Install All Accessories . . . . . . . . . . . . . . . . . . . .15
MoistureMiser Dehumidification Package . . . . . . . . .16
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32,33
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, re-
pair, 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
Catalog No. 535-034
Book 1
Tab
1b
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
Page
Printed in U.S.A.
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.
INSTALLATION
Step 1 - Provide Unit Support
ROOF CURB - Assemble and install accessory roof curb or
horizontal adapter roof curb in accordance with instructions
shipped with the curb or horizontal adapter. Accessory roof
curb and horizontal adapter roof curb and information required
to field fabricate a roof curb or horizontal adapter roof curb are
shown in Fig. 1 and 2. Install insulation, cant strips, roofing,
and counter flashing 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 adapter roof curb is critical for a leak-proof seal.
Install gasket supplied with the roof curb or adapter roof
curb as shown in Fig. 1. Improperly applied gasket can
result in air leaks and poor unit performance.
Curb or adapter roof curb should be level. This is necessary
to permit unit drain to function properly. Unit leveling toler-
ance is ±
1
/
in. per linear ft in any direction. Refer to Accesso-
16
ry Roof Curb or Horizontal Adapter Roof Curb Installation In-
structions for additional 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.
Form 50TJ-17SI
Pg 1
50TJ016-028
Inspect
unit
1
/
in. per linear ft in any direc-
16
2-01
Replaces: 50TJ-14SI
for
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Table of Contents
Related Manuals for Carrier 50TJ016-028
Summary of Contents for Carrier 50TJ016-028
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Page 1: Table Of Contents
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 50TJ-17SI 50TJ016-028 INSTALLATION Inspect unit in. per linear ft in any direc- Pg 1... - Page 3 NOTE: For preassembled horizontal adapter roof curb part no. CRRFCURB013A00, the accessory kit includes a factory-designed, high-static, transition duct. horizontal CRRFCURB012A00, a field-supplied transition duct is required. Fig. 2 — Horizontal Adapter Roof Curb and Roof Curb MAXIMUM UNIT SHIPPING WEIGHT 50TJ 1550 1650...
- Page 6 †The 50TJ028 units requires 2-in. industrial-grade filters capable of handling face velocities of up to 625 ft/min (such as American Air Filter no. 5700 or equivalent). NOTE: The 50TJ016-028 units have a low-pressure switch (standard) located on the suction side. 1700 1850 1...ZR125KC,...
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Page 7: Step 3 - Field Fabricate Ductwork
Step 3 — Field Fabricate Ductwork — ducts to building structure. Use flexible duct connectors be- tween unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes. Ducts passing through an unconditioned space must be in- sulated and covered with a vapor barrier. -
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- age temperature. - Page 9 NOMINAL COMPRESSOR VOLTAGE UNIT VOLTAGE RANGE No. 1 50TJ (3 Ph, Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp 60 Hz) 208/230 187 253 28.8 195 28.8 195 342 418 15.0 123 15.0 123 (15 Tons) 414 508 14.7 518 633 10.8 208/230 187 253 30.1 225 28.8 195...
- Page 10 NOMINAL COMPRESSOR VOLTAGE UNIT VOLTAGE RANGE No. 1 50TJ (3 Ph, Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp 60 Hz) 208/230 187 253 41.0 350 37.8 239 342 418 21.8 151 21.2 145 (25 Tons) 414 508 21.8 158 17.2 125 518 633 17.3 125 12.4 LEGEND —...
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Page 11: Optional Convenience Outlet
OPTIONAL NON-FUSED DISCONNECT — On units with the optional non-fused disconnect, incoming power will be wired into the disconnect switch. Refer to Fig. 13 for wiring for 100 and 200 amp disconnect switches. Units with an MOCP under 100 will use the 100 amp disconnect switch. Units with an MOCP over 100 will use the 200 amp discon- nect switch. -
Page 12: Step 8 - Install Outdoor-Air Hood
Table 3 — Heat Anticipator Settings UNIT UNIT 50TJ VOLTAGES 26/34 208/230-3-60 42/56 56/75 380-3-60 016-028 460-3-60 575-3-60 *Heater kW is based on heater voltage of 208 v, 240 v, 380 v, 480 v, and 575 v. Fig. 16 — EconoMi$er Control Module Adjustment Potentiometers CONTROL MODULE Fig. - Page 13 Fig. 19 — Seal Strip Location (Air Hood Cross-Sectional View) BAFFLE (028 ONLY) HOOD TOP PANEL HOOD DRAIN PAN UPPER FILTER RETAINER NOTE: The outdoor-air hood comes with a baffle which is used on 028 units only; discard baffle for 016-024 units. Fig.
- Page 14 MECHANICAL COOLING LOCKOUT — Determine the outdoor-air temperature at which you want the mechanical cooling (compressors) to be disabled. Locate the mechanical cooling lockout (MECH CLG LOCKOUT) potentiometer. To disable this feature, turn the potentiometer counterclockwise (CCW) to the OFF position. Otherwise, set the value between 10 and 60 F.
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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: 1. The indoor fan must be on to set the ventilation air. Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit con- nection board. -
Page 16: Motormaster Iii Control Installation
Step 10 — Install Humidistat for Optional MoistureMiser Dehumidification Package — MositureMiser dehumidification package operation can be controlled by field installation of a Carrier-approved humidis- tat. To install the humidistat perform the following procedure: 1. Locate humidistat on a solid interior wall in the condi- tioned space. - Page 17 SENSOR SENSOR LOCATION LOCATION HAIRPIN END 50TJ016 NOTE: All sensors are located on the eighth hairpin up from the bottom. Fig. 26 — Motormaster® I Sensor Locations LEGEND LLSV — Liquid Line Solenoid Valve — Low Pressure Switch — Terminal Block TRAN —...
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Page 18: Start-Up
Fig. 29 — Typical MoistureMiser Dehumidification Package Control Box START-UP Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up. Unit Preparation — Check that unit has been installed in accordance with these installation instructions and all applica- ble codes. - Page 19 Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. 6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details. Watts Watts 1652 1061 2.13...
- Page 20 Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. 6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details. Watts Watts 2441 3.22...
- Page 21 Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. 6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details. Watts Rpm Watts Rpm 3574 1083 4.70...
- Page 22 Table 11 — Accessory/FIOP Static Pressure (in. wg) — 50TJ016 COMPONENT EconoMi$er Glycol Coil Electric Heat (kW) 26/34 42/56 56/75 LEGEND FIOP — Factory-Installed Option Table 12 — Accessory/FIOP Static Pressure (in. wg) — 50TJ020-028 COMPONENT EconoMi$er Glycol Coil Electric Heat (kW) 20, 26/34 35, 42/56 56/75...
- Page 23 Base Unit Operation COOLING, UNITS WITHOUT ECONOMI$ER — When thermostat calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), and compressor contactor no. 1 (C1) are energized and evaporator-fan motor, compressor no. 1 and condenser fans start. The condenser-fan motors run continuously while unit is cooling.
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Page 24: Service
When the humidistat is satisfied, the humidistat internal switch opens, cutting power to and deenergizing the LLSVs. The refrigerant is routed back through the evaporators and the sub-cooler coils are removed from the refrigerant loops. When the thermostat is satisfied, C1 and C2 are deenergized and the compressors, IFM, and OFMs shut off. - Page 25 the inlet of the compressor. The compressor should then be run for 10 minutes, shut down, and the access valve opened until no oil flows. This should be repeated twice to make sure the proper oil level has been achieved. FAN SHAFT BEARINGS —...
- Page 26 Fig. 32 — 50TJ016 Evaporator-Fan Motor Section Belt Tension Adjustment — To adjust belt tension: 1. Loosen fan motor bolts. 2. Adjust belt tension: a. Size 016 Units: Move motor mounting plate up or down for proper belt tension ( one finger).
- Page 27 Do not manually operate damper motor. Refrigerant Charge — listed on unit nameplate and in Table 1. Refer to Carrier GTAC 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 28 3.2-amp circuit breaker. Breaker can be reset. If it trips, determine cause of trouble before resetting. Replacement Parts — parts may be obtained from any Carrier distributor upon request. EconoMi$er LEDs — has an LED for diagnostic purposes. The flash code identifica- tion is shown in Table 15.
- Page 29 ELECTRIC HEAT 208/240 v Amps 200/230 v kW 71.3/82.3 25.7/34.2 117/135 42.2/56.1 156/180 56.2/74.8 Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown)
- Page 30 Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown) (cont) Fig. 38 — Typical Component Arrangement (50TJ024 Shown)
- Page 31 LEGEND AND NOTES FOR FIG. 37 AND 38 — Adjustable Heat Anticipator BRK W/AT — Breaks with Amp Turns — Contactor, Compressor — Circuit Breaker — Cooling Compensator — Crankcase Heater — Compressor Lockout COMP — Compressor Motor — Control Relay —...
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Page 32: Troubleshooting
PROBLEM Compressor and Power failure. condenser fan Fuse blown or circuit breaker tripped. will not start. Defective thermostat, contactor, transformer, or control relay. Insufficient line voltage. Incorrect or faulty wiring. Thermostat setting too high. Compressor will not start Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace. but condenser fan runs. - Page 33 PROBLEM POTENTIAL CAUSE Damper Does Not Indoor (Evaporator) Fan is Open No Power to EconoMi$er Controller No Power to G Terminal Controller Fault Thermostat Fault Actuator Fault EconoMi$er Minimum Position Set Operation Limited to Incorrectly Minimum Position EconoMi$er Changeover Set Point Set Too High or Too Low Discharge Air Thermistor Faulty...
- Page 34 Course descriptions and schedules are in our catalog. [ ] Packaged Service Training 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.
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Page 36: 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.