Table of Contents
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . .
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Step 1 - Provide Unit Support . . . . . . . . . . . . .
• ALTERNATE UNIT SUPPORT
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . .
• POSITIONING
Step 3 - Field Fabricate Ductwork . . . . . . . . .
Step 4 - Make Unit Duct Connections . . . . . .
Step 5 - Trap Condensate Drain . . . . . . . . . . .
Step 6 - Controls Options . . . . . . . . . . . . . . . . .
UNIT (Stand-Alone Applications)
• FEATURES WITH SENSOR CONTROL OF
UNIT (Network Applications)
Step 7 - Make Electrical Connections . . . . . .
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Barometric Relief Damper Hood . . . . . . . . . . . 18
Step 10 - Install Accessories . . . . . . . . . . . . . . 18
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-28
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-33
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 34-38
START-UP CHECKLIST . . . . . . . . . . . . . . . CL-1, CL-2
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, 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 per-
sonnel. When working on air-conditioning equipment, ob-
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.
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. 535-002
Tab
5a
Installation, Start-Up and
Service Instructions
Page
Printed in U.S.A.
Single-Package Rooftop
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex-
tinguishers available for all brazing operations.
1
1
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
5
5
5
7
7
Step 1 - Provide Unit Support
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
9
ROOF CURB - Assemble and install accessory roof curb
in accordance with instructions shipped with the curb.
Accessory roof curb and information required to field fab-
ricate a roof curb or horizontal adapter are shown in Fig. 1.
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 is critical for a leak-proof seal. Install gasket sup-
plied with the roof curb as shown in Fig. 1. Improp-
erly applied gasket can result in air leaks and poor unit
performance.
Curb should be level. This is necessary to permit unit drain
to function properly. Unit leveling tolerance is shown in
Fig 1. Refer to Accessory Roof Curb Installation Instruc-
tions for additional information as required. When acces-
sory roof curb is used, unit may be installed on class A, B,
or C roof covering material.
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 (refer to Fig. 2 and 3) with a minimum number
of equally spaced 4-in. x 4-in. pads. 50EJQ,EWQ024 and
028 units require 3 pads on each side. Unit may sag if sup-
ported by corners only.
Form 50EJQ,EWQ-2SI
50EJQ,EWQ024,028
Heat Pump Units
INSTALLATION
Pg 1
8-97
Replaces: 50EJQ,EWQ-1SI
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Table of Contents
Troubleshooting
Related Manuals for Carrier 50EJQ
Summary of Contents for Carrier 50EJQ
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Page 1: Table Of Contents
(refer to Fig. 2 and 3) with a minimum number sonnel. When working on air-conditioning equipment, ob- of equally spaced 4-in. x 4-in. pads. 50EJQ,EWQ024 and serve precautions in the literature, tags and labels attached 028 units require 3 pads on each side. Unit may sag if sup- to the unit, and other safety precautions that may apply. -
Page 2: Roof Curb
NOTE: To prevent standing water in the drain pan of the indoor section and the heat exchangers, UNIT CAN ONLY BE PITCHED AS SHOWN. UNIT LEVELING TOLERANCES DIMENSIONS* (Degrees and Inches) NOTES: 1. Unless otherwise specified, all dimensions are to out- side of part. - Page 3 Economizer Side: 6 -0 Filter Access Side: 10 -0 (for re- moval of evaporator coil) 4. For smaller service and operational clearances, contact Carrier Applica- tion Engineering department. 5. Bottom ducts designed to be attached to accessory roof curb. If unit is mounted...
- Page 4 4168 ⁄ ⁄ 1245 1222 4. For smaller service and operational clearances, con- tact Carrier Application Engineering department. 4168 ⁄ ⁄ 1245 1222 5. Dimensions are in inches. Dimensions in [ ] are in millimeters. 6. For units equipped with electric heat, a field-supplied 90°...
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Page 5: Step 2 - Rig And Place Unit
Step 4 — Make Unit Duct Connections Although unit is weatherproof, guard against water from 50EJQ UNITS — Unit is shipped for through-the-bottom higher level runoff and overhangs. duct connections. Ductwork openings are shown in Fig. 2. Attach all ductwork to roof curb. Air distribution is shown ROOF MOUNT —... - Page 6 Table 1 — Physical Data UNIT 50EJQ,EWQ NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb)* Unit Al/Al† 4168 4168 Al/Cu† 4388 4388 Roof Curb (14-in. curb) COMPRESSOR Type Ckt 1 06D824 06D328 Ckt 2 06D824 06D328 Number of Refrigerant Circuits Oil (oz) (Ckt1, Ckt 2) 115 ea.
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Page 7: Step 5 - Trap Condensate Drain
• control of the indoor fan eters: CV (constant volume) operation; stand-alone unit with • outdoor-air temperature/supply-air temperature monitoring field-supplied sensors installed; as a system via the Carrier • control of outdoor fan based on outdoor-air temperature Comfort System (TEMP); optional electronic expansion board installed, linked to the Carrier Comfort Network;... -
Page 8: Features With Sensor Control Of
• access to the Display, Maintenance, Configuration, Serv- ice, and Set Point data table through network software When the unit is connected to the CCN (Carrier Comfort Network), the following expansion board features can be When the unit is equipped with a field-supplied space tem- utilized. -
Page 9: Step 7 - Make Electrical Connections
⁄ -in. diameter hole standard, a connection for integration into a Carrier Comfort provided in bottom of unit control box. Field-supplied strain Network. relief must be used going into the box. After wiring is in... - Page 10 LEGEND CCN — Carrier Comfort Network N.O. — Normally Open COM — Common — Relay — Diode — Serial Input/Output — Dual In-Line Package — Switch — Light-Emitting Diode — Terminal N.C. — Normally Closed Fig. 10 — Control Board Diagram...
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Page 11: Field Control Wiring
Fig. 12 — Control Box Diagram IMPORTANT: Be certain unused wires are capped. Failure to do so may damage the transformers. FIELD CONTROL WIRING — Install either a Carrier- approved accessory thermostat or a CCN (Carrier Comfort Network) compatible temperature sensor. A control box dia- gram is shown in Fig. - Page 12 Table 4 — Electrical Data — 50EJQ,EWQ024,028 VOLTAGE POWER ELECTRIC UNIT NOMINAL COMPRESSORS POWER SUPPLY RANGE EXHAUST HEAT* SIZE VOLTAGE 50EJQ,EWQ (3 Ph 60 Hz) MIN MAX Qty Hp FLA (ea) FLA LRA MOCP† — — —/— —/— 107.4/105.9 125/125 23.6...
- Page 13 CCN PLUG communication defaults. TYPE INSULATION COLOR PIN NO. Positive (+) Carrier Comfort Network Interface — The 50EJQ,EWQ units Ground WHITE can be connected to the CCN. The communication bus wir- Negative (−) BLACK ing is supplied and installed in the field. Wiring consists of shielded, 3-conductor cable with drain wire.
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Page 14: Step 8 - Make Outdoor-Air Inlet
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION Fig. 15 — Space Temperature Averaging Wiring bus is entirely within one building, the resulting continuous Step 8 — Make Outdoor-Air Inlet Adjustments shield must be connected to a ground at one point only. If the communication bus cable exits from one building and ECONOMIZER enters another, the shields must be connected to grounds at... - Page 15 1. Apply black seal strip (provided in package) to outside top-edge of hood sides. Wrap seal strip over edge to cover top flange (4 hood sides). Make sure seal strip covers screw holes. Allow strip to overhang ⁄ -in. past the end opposite the mounting flange.
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Page 16: Economizer Settings
The control is mounted in the economizer hood. The sensor is mounted in the return duct (50EJQ) or return air plenum (50EWQ). Differential Enthalpy Sensor Installation — To install the con- Fig. 21 — Adding Foam Strip to Hood Side trol, perform the following procedure: 1. - Page 17 BLACK SEAL STRIP (CENTERED) BLOCKOFF BAFFLE FILTER COVER GRAY FOAM STRIP Fig. 25 — Attaching Seal Strip to Filter Cover Fig. 22 — Adding Foam Strip to Block-Off Baffle 2. Remove the economizer inlet filters from the bottom of the right hand economizer hood. See Fig. 17. 3.
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Page 18: Step 9 - Position Power Exhaust
CONTROL POINT CONTROL (APPROX. DEG.) CURVE AT 50% RH F (C) 73 (23) 70 (21) 67 (19) 63 (17) HH57AC077 ENTHALPY CONTROL C 7 4 0 0 A 1 0 0 4 HH57AC078 ENTHALPY SENSOR (USED WITH ENTHALPY CONTROL FOR DIFFERENTIAL ENTHALPY OPERATION) Fig. - Page 19 NOTE: Partitions are shown for both side supply (EWQ) and vertical supply (EJQ). Fig. 29 — Economizer Details / o — Diameter NOTES: 1. Unless otherwise specified, all dimensions are to outside of part. 2. Dimensions are in inches. 3. Two assemblies per unit. Fig.
- Page 20 MMSN — Motormaster Sensor — Outdoor Fan Contactor MMSN — Outdoor Fan Motor — Terminal Block OFC1 MOTOR MASTER OFM1 GRN YEL NOTE: Motormaster Relay part no. is HN61KZ024 with HY07RB030 socket. Fig. 33 — Motormaster III Device Wiring, 50EJQ,EWQ024 and 028...
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Page 21: Start-Up
There are 3 adjustments at the R353 module, all of which START-UP have been factory set. In the center of the circuit board is a Use the following information and Start-Up Checklist on set of 4 pins with a jumper, labeled J2. This determines the page CL-1 to check out unit PRIOR to start-up. - Page 22 Exhaust LEGEND NOTES: 1. The OPEN side of the DIP switch is marked ‘‘OPEN.’’ When the CCN — Carrier Comfort Network rocker switch is on the ‘‘OPEN’’ side of the switch, the switch is — Constant Volume OPEN. 2. DIP switch no. 7 is used for indoor fan control during heat opera- tion.
- Page 23 be configured. The control module will set appropriate Crankcase Heater(s) — Heater(s) is energized as long operating mode and fan control. The control module will turn as there is power to the unit, except when the compressors on indoor fan if in Occupied mode or if the unit is in Un- are operating.
- Page 24 Table 11 — Fan Performance, 50EJQ024,028 — Vertical Discharge Units FOR 50EWQ UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.3 IN. WG AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) AIRFLOW (Cfm) 4,000 0.77 1.09 1.43 1.78 2.13 2.50 2.87 3.25 5,000 1.14 1.50...
- Page 25 LEGEND BHP — Brake Horsepower NOTE: Extensive motor and electrical testing on the Carrier units has ensured that the full horsepower range of the motor can be utilized with confidence. Using your fan motors up to the horsepower ratings shown on the Motor Limitations table will not result in nuisance...
- Page 26 Table 14 — User Defined Set Points SET POINT FORMAT DESCRIPTION LIMITS DEFAULT OHSP xx.xF Occupied Heat Set Point 55 to 80 F 68 F OCSP xx.xF Occupied Cool Set Point 55 to 80 F 78 F UHSP xx.xF Unoccupied Heat Set Point 40 to 80 F 55 F UCSP...
- Page 27 IAQ sensor are required for IAQ control. The and adjusting the set point dial to the desired building pres- Carrier sensors operate with a 4 to 20 mA signal. The 4 sure. The standard power exhaust package controls up to to 20 mA signal is connected to T11 (+) and T12 (−) on...
- Page 28 The Motormaster III device is specifically designed violet wire coming from T24 on the base module board and for use on Carrier equipment and controls the outdoor- the red wire coming from T29 on the base module board. fan motor speed in response to the saturated condensing The splice is made where the OAT (outdoor air ther- temperature.
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Page 29: Service
IMPORTANT: Do not use reclaimed oil or oil that has unit prior to disassembly. This will allow proper replace- been exposed to the atmosphere. Refer to Carrier Stand- ment of the top cover onto the unit and prevent rainwater ard Service Techniques Manual, Chapter 1, Refriger- from leaking into the unit. - Page 30 Refrigerant Charge — 6. Turn on unit power. Amount of refrigerant charge is listed on unit nameplate and in Table 1. Refer to Carrier Indoor-Fan Motor Replacement GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures.
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Page 31: Service
Determine the cause and correct it before resetting the breaker. Overtemperature — Each 06D type compressor has an in- Replacement Parts — A complete list of replacement ternal protector to protect it against excessively high dis- parts may be obtained from any Carrier distributor upon charge gas temperatures. request. - Page 32 Fig. 42 — Typical 24-V Control Schematic...
- Page 33 LEGEND FOR FIG. 42 — Adjustable Heat Anticipator PESC — Power Exhaust Sequencer Controller — Building Pressure — Plug Assembly — Circuit Breaker — Relay — Cooling Compensator — Reversing Valve Solenoid — Communication — Switch COMP — Compressor Motor —...
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Page 34: Troubleshooting
TROUBLESHOOTING Typical heating and cooling refrigerant circuiting diagrams are shown in Fig. 43 and 44. CHECK VALVES NOTES: 1. Hot gas from compressor flows through the 4-way valve and is directed to the indoor coil header. At the header it is condensed and subcooled. Refrigerant leaves COOLING HEATING the indoor coil by way of the check valve to the liquid line. - Page 35 LED blinks during transmission with the CCN Diagnostic LEDs (Light-Emitting Diodes) — There (Carrier Comfort Network). The green LED blinks during are 3 LEDs (red, yellow, and green) on the lower left hand transmission with the expansion board. side of the control board. The red light is used to check unit operation and alarms.
- Page 36 Compr. 2 — DO (HV) — LEGEND LEGEND — Analog Output OAT — Outdoor-Air Temperature — Analog Input CCN — Carrier Comfort Network OFC — Outdoor Fan Contactor — Direct Input — Direct Input SAT — Supply-Air Temperature — Direct Output — Direct Output SPT —...
- Page 37 TROUBLESHOOTING CHART, HEATING CYCLE...
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Page 38: Troubleshooting
TROUBLESHOOTING CHART, COOLING CYCLE... - Page 39 START-UP CHECKLIST MODEL NO.: SERIAL NO.: DATE: TECHNICIAN: PRE-START-UP: VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS VERIFY INSTALLATION OF ECONOMIZER HOOD VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT...
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Page 40: Start-Up Checklist
BELT PART NUMBER BELT SIZE FILTER QUANTITY FILTER SIZES ADDITIONAL NOTES: Copyright 1997 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. 535-002 Printed in U.S.A.