Rheem RACB Series Air Conditioners

Product Information

• Product Nam e: Packaged Air Conditioners (RACB Series)
• Nominal Size s: 2-5 Tons [7-17.6 kW]
• Refrigerant: R-410A
• Cooling Performance
  • Model RACBZR048AJT
  • Gross Cooling Capacity : 49,000 Btu [14.36 kW]
  • EER/SEER : 10.6/13.4
  • Nominal CFM/AHRI Rated CFM : 1600/1600 [755/755]
  • AHRI Net Cooling Capacity : 47,000 Btu [13.77 kW]
  • Net Sensible Capacity : 32,500 Btu [9.52 kW]
  • Net Latent Capacity : 14,500 Btu [4.25 kW]
  • Net System Power : 3.9 kW
  • Model RACBZR060AJT
  • Gross Cooling Capacity : 60,000 Btu [17.58 kW]
  • EER/SEER: 10.6/13.4
  • Nominal CFM/AHRI Rated CF M: 2000/1900 [944/897]
  • AHRI Net Cooling Capacity : 57,000 Btu [16.7 kW]
  • Net Sensible Capacity : 40,100 Btu [11.75 kW]
  • Net Latent Capacity : 16,900 Btu [4.95 kW]
  • Net System Power : 4.89 kW
• Compressor Type : 1/Scroll
• Outdoor Sound Rating : 75 dB (Model RACBZR048AJT), 78 dB (Model RACBZR060AJT)
• Refrigerant Charge: 64 oz. [1814 g]
• Weights
  • Net Weight: 357 lbs. [162 kg]
  • Ship Weight: 384 lbs. [174 kg]

Product Usage Instructions

1. Before installation, ensure that the unit is compatible with your electrical and ductwork systems.
2. Place the packaged air conditioner in the desired location, ensuring proper clearance for airflow.
3. Connect the electrical wiring according to local electrical codes.
4. Connect the ductwork to the unit using appropriate fittings and seals.
5. If required, install a PVC P-Trap for condensate drainage.
6. Ensure that all connections are secure and properly sealed to prevent leaks.
7. Once installation is complete, turn on the power supply and test the unit’s operation.
8. Refer to the user manual for detailed instructions on operating and maintaining the packaged air conditioner.

BREAKDOWN PAGE

IMPORTANT SAFETY AND GENERAL INFORMATION

Introduction
This booklet contains the installation and operat-ing instructions for your 3 ton, 4 ton, 5 ton, or 6 ton combination gas heating/electric cooling unit. There are some precautions that should be taken to ensure proper operation. Improper installation can result in unsatisfactory operation or dangerous con- ditions.
Read this booklet and any instructions packaged with separate equipment required to make up the system prior to installation. Give this booklet to the owner and explain its provisions. The owner should retain this booklet for future reference.

WARNING: The manufacturer’s warranty does not cover any damage or defect to the air conditioner caused by the attachment or use of any components, accessories or devices (other than those authorized by the manufacturer) into, onto or in conjunction with the air conditioner.
You should be aware that the use of unauthorized components, accessories or devices may adversely affect the operation of the air conditioner and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized compo-nents, accessories or devices.

Agency Performance Audit and Efficiency Testing Notice
NOTICE: BREAK-IN PERIOD
Prior to agency testing, run the compressor for 16 hours at 115of outdoor ambient temperature and 80o dry bulb / 75o wet bulb indoor ambient temperature.

NOTICE: EFFICIENCY TESTING NOTICE
For purposes of verifying or testing efficiency ratings, the test procedure in title 10 Appendix M to Subpart B of Part 430 (Uniform Test Method for Measuring the Energy Consumption of Central Air Conditioners and Heat Pumps) and the clarifying provisions provided in the stan-dards listed below that were applicable at the date of manufacture should be used for test set up and performance.

SETUP

• ASHRAE 37 – 2009 (RA 2019)

PERFORMANCE

• ANSI/ASHRAE 90.1 – 2019
• ANSI/ASHRAE 103 (2017)
• AHRI Operations for Unitary Small AC Equipment 210/240 (2017) for 3-5T

SAFETY

• UL 1995 5th Edition

Importance of a Quality Installation
Optimal system performance and longevity de-pend upon a quality and proper installation. Failure to properly setup and commission this unit could result in undesirable operation and subse-quent faults and potential failures.
Carefully follow all guidelines listed in the manual and industry best practices. Conform to all local code requirements. Contact your local technical representative with any questions or concerns.

Importance of Air Flow and Setup
Optimal system performance is also dependent upon having the ideal airflow across the condens-ing and evaporating coils, and upon matching the charge weight to the manufacturer’s spec for the unit. Improper or restricted air flow, and incorrect charge weight, will hinder the performance of the unit. Please refer to the manufacturer’s recom-mended clearances for setting the unit and the included guide for setting air flow. Refer to the rat-ing plate for the charge weight.

Checking Product and Inspection
Upon receiving the unit, inspect it for any damage from shipment. Claims for damage, either ship-ping or concealed, should be filed immediately with the shipping company.

IMPORTANT: Check the unit model number, heating size, electrical characteristics, and accessories to determine if they are correct.

Safety Information

WARNING
PROPOSITION 65: THIS APPLIANCE CONTAINS FIBERGLASS INSULATION. RESPIRABLE PARTICLES OF FIBERGLASS ARE KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER.

WARNING
THE MANUFACTURER’S WARRANTY DOES NOT COVER ANY DAMAGE OR DEFECT TO THE AIR CONDITIONER CAUSED BY THE ATTACHMENT OR USE OF ANY COMPONENTS, AC-CESSORIES OR DEVICES (OTHER THAN THOSE AUTHORIZED BY THE MANUFACTURER) INTO, ONTO OR IN CONJUNCTION WITH THE AIR CONDITIONER. YOU SHOULD BE AWARE THAT THE USE OF UNAUTHORIZED COMPONENTS, ACCESSORIES OR DEVICES MAY ADVERSELY AFFECT THE OPERATION OF THE AIR CONDITIONER AND MAY ALSO ENDANGER LIFE AND PROPERTY. THE MANUFACTURER DISCLAIMS ANY RESPON-SIBILITY FOR SUCH LOSS OR INJURY RESULTING FROM THE USE OF SUCH UNAUTHORIZED COMPONENTS, ACCESSO-RIES OR DEVICES.

WARNING
DISCONNECT ALL POWER TO THE UNIT BEFORE STARTING MAINTENANCE. FAILURE TO DO SO CAN RESULT IN SEVERE ELECTRICAL SHOCK OR DEATH.

WARNING
UNITS ARE NOT DESIGN CERTIFIED TO BE INSTALLED IN-SIDE THE STRUCTURE. DOING SO CAN CAUSE INADEQUATE UNIT PERFORMANCE AS WELL AS PROPERTY DAMAGE AND CARBON MONOXIDE POISONING RESULTING IN PERSONAL INJURY OR DEATH.

WARNING
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT RE-TURN DUCTWORK TO ANY OTHER HEAT PRODUCING DEVICE SUCH AS A FIREPLACE INSERT, STOVE, ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN FIRE, CARBON MONOXIDE POISONING, EXPLOSION, PROP- ERTY DAMAGE, SEVERE PERSONAL INJURY OR DEATH.

WARNING
THE UNIT MUST BE PERMANENTLY GROUNDED. A GROUND-ING LUG IS PROVIDED IN THE ELECTRIC HEAT KIT FOR A GROUND WIRE. FAILURE TO GROUND THIS UNIT CAN RESULT IN FIRE OR ELECTRICAL SHOCK CAUSING PROPERTY DAM-AGE, SEVERE PERSONAL INJURY OR DEATH.

WARNING
ONLY ELECTRIC HEATER KITS SUPPLIED BY THIS MANUFAC-TURER AS DESCRIBED IN THIS PUBLICATION HAVE BEEN DESIGNED, TESTED, AND EVALUATED BY A NATIONALLY RECOGNIZED SAFETY TESTING AGENCY FOR USE WITH THIS UNIT. USE OF ANY OTHER MANUFACTURED ELECTRIC HEATERS INSTALLED WITHIN THIS UNIT MAY CAUSE HAZ-ARDOUS CONDITIONS RESULTING IN PROPERTY DAMAGE, FIRE, BODILY INJURY OR DEATH.

WARNING
DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BE-FORE ATTEMPTING TO CHANGE BLOWER SPEEDS. FAILURE TO DO SO MAY RESULT IN ELECTRICAL SHOCK OR SEVERE PERSONAL INJURY OR DEATH.

CAUTION
R-410A SYSTEMS OPERATE AT HIGHER PRESSURES THAN R-22 SYSTEMS. DO NOT USE R-22 SERVICE EQUIPMENT OR COMPONENTS ON R-410A EQUIPMENT.

WARNING

IMPORTANT: ALL MANUFACTURER PRODUCTS MEET CURRENT FEDERAL OSHA GUIDELINES FOR SAFETY. CALIFORNIA PROPOSITION 65 WARNINGS ARE REQUIRED FOR CERTAIN PRODUCTS, WHICH ARE NOT COVERED BY THE OSHA STANDARDS.
CALIFORNIA’S PROPOSITION 65 REQUIRES WARNINGS FOR PRODUCTS SOLD IN CALIFORNIA THAT CONTAIN, OR PRO-DUCE, ANY OF OVER 600 LISTED CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER OR BIRTH DE-FECTS SUCH AS FIBERGLASS INSULATION, LEAD IN BRASS, AND COMBUSTION PRODUCTS FROM NATURAL GAS.
ALL “NEW EQUIPMENT” SHIPPED FOR SALE IN CALIFORNIA WILL HAVE LABELS STATING THAT THE PRODUCT CON-TAINS AND/OR PRODUCES PROPOSITION 65 CHEMICALS. ALTHOUGH WE HAVE NOT CHANGED OUR PROCESSES, HAV-ING THE SAME LABEL ON ALL OUR PRODUCTS FACILITATES MANUFACTURING AND SHIPPING. WE CANNOT ALWAYS KNOW “WHEN, OR IF” PRODUCTS WILL BE SOLD IN THE CALIFORNIA MARKET.
YOU MAY RECEIVE INQUIRIES FROM CUSTOMERS ABOUT CHEMICALS FOUND IN, OR PRODUCED BY, SOME OF OUR HEATING AND AIR-CONDITIONING EQUIPMENT, OR FOUND IN NATURAL GAS USED WITH SOME OF OUR PRODUCTS. LISTED BELOW ARE THOSE CHEMICALS AND SUBSTANCES COMMONLY ASSOCIATED WITH SIMILAR EQUIPMENT IN OUR INDUSTRY AND OTHER MANUFACTURERS.

• GLASS WOOL  (FIBERGLASS) INSULATION
• CARBON MONOXIDE (CO)
• FORMALDEHYDE
• BENZENE

MORE DETAILS ARE AVAILABLE AT THE WEBSITES FOR OSHA (OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION), AT WWW.OSHA.GOV AND THE STATE OF CALIFORNIA’S OEHHA (OFFICE OF ENVIRONMENTAL HEALTH HAZARD ASSESSMENT), AT WWW.OEHHA.ORG. CONSUMER EDU-CATION IS IMPORTANT SINCE THE CHEMICALS AND SUB-STANCES ON THE LIST ARE FOUND IN OUR DAILY LIVES. MOST CONSUMERS ARE AWARE THAT PRODUCTS PRESENT SAFETY AND HEALTH RISKS, WHEN IMPROPERLY USED, HAN-DLED AND MAINTAINED.

EFFICIENCY TESTING NOTICE
For purposes of verifying or testing efficiency ratings, the test procedure in Title 10 Part 431 Appendix A to Subpart F (Uniform Test Method for Measuring the Energy Consumption of Small Large and Very Large Commercial Packaged Air Conditioning and Heating Equipment), Title 10 Part 431.76 Subpart D (Uniform Test Method for Measuring Energy Consumption of Commercial Warm Air Furnaces), and the clarifying provisions provided in the AHRI Operations Manuals for Unitary Large Equipment 340/360, 365 and Commercial Furnaces that were applicable at the date of manu-facture should be used for test set up and performance.

GENERAL SPECIFICATIONS

Major Components
The unit includes a hermetically-sealed refrigerating system consisting of a scroll compressor, con-denser coil, evaporator coil with TXV, a circulation air blower, a condenser fan, a heat exchanger as-sembly, gas burner and control assembly, combustion air motor and fan, and all necessary internal electrical wiring. The cooling system of these units is factory evacuated, charged, and performance tested. Refrigerant amount and type are indicated on rating plate.

Product Data Information

IMPORTANT: This unit must be mounted level in both directions to allow water to drain from the condenser section and condensate pan.

FIGURE 1
UNIT DIMENSIONS AND ACCESS LOCATIONS

Dimensional Information (Cont.)

SQUARE DUCT CONNECTIONS

• IMPORTANT: DO NOT SCREW OR DRILL OUTSIDE THE DESIGNATED AREAS.
• IMPORTANT: This product is designed to be operated with 14( round supply and re-turn air ducts. Square ducts may be used, provided that a minimum length of 24( of round duct is used on the supply and return connections. This requirement is necessary to maintain blower performance.

INSTALLATION OF THE UNIT

General

Installation
Install this unit in accordance with The American National Standard Z223.1-latest edition booklet entitled “National Fuel Gas Code”, and the re- quirements or codes of the local utility or other authority having jurisdiction. Additional helpful publications available from the “National Fire Protection Association” are

• NFPA-90A – Installation of Air Conditioning and Ventilating Systems 2018 or latest edition.
• NFPA-90B – Warm Air Heating and Air Conditioning Systems 2018 or latest edition.

These publications are available from: National Fire Protection Association, Inc.
NFPA.ORG

Pre-Installation Checkpoints
Before attempting any installation, carefully con-sider the following points

• Structural strength of supporting members (Rooftop Installation)
• Clearances and provision for servicing
• Power supply and wiring
• Gas supply and piping
• Air duct connections and sizing
• Drain facilities and connections
• Location for minimum noise and vibration -away from bedroom windows

Tool and Refrigerant
Tools Required for Installing and Servicing R-410A Models

Manifold Sets

• Up to 800 PSIG High Side
• Up to 250 PSIG Low Side
• 550 PSIG Low Side Retard

Manifold Hoses

• Service Pressure Rating of 800 PSIG
• Zero-loss fittings

Recovery Cylinders

• 400 PSIG Pressure Rating

Dept. of Transportation

• 4BA400 or BW400

Specifications of R-410A
All units are factory charged with R-410a Refrigerant.
Combustibility: At pressures above 1 atmo-sphere, mixture of R-410A and air can become combustible. R-410A and air should never be mixed in tanks or supply lines, or be al-lowed to accumulate in storage tanks. Leak checking should never be done with a mix-ture of R-410A and air. Leak checking can be performed safely with nitrogen or a mixture of R-410A and nitrogen.

Quick Reference Guide for R- 410A
Ensure that servicing equipment is designed to operate with R-410A.

• R-410A refrigerant cylinders are pink.
• R-410A, as with other HFC’s is only compatible with POE oils.
• Vacuum pumps will not remove moisture from POE oil.
• R-410A systems are to be charged with liquid refrigerants.
• Do not install a suction line filter drier in the liquid line.
• A liquid line filter drier is standard on every unit.
• Desiccant (drying agent) must be compatible for POE oils and R-410A.

Evaporator Coil/TXV
The thermostatic expansion valve is specifically designed to operate with R-410A. The existing evaporator must be replaced with the factory specified TXV evaporator specifically de-signed for R-410A.

Choosing a Location
Unit Location: Allowable Clearances and Operational Issues
The unit location must comply with the allowable clearances listed in Figure 2. Failure to comply with the recommended clearances may result in opera-tional issues such as decreased capacity, restricted condenser airflow, and condenser motor fatigue.

Outside Installation
WARNING: These units are designed certified for outdoor installation only. Installation inside any part of a structure can result in inadequate unit performance as well as property damage. Installation inside can also cause recirculation of flue products into the conditioned space resulting in personal injury or death.

1. Select a location where external water drainage cannot collect around unit.
2. Provide a level slab sufficiently high enough above grade to prevent surface water from entering the unit
3. Locate the unit to provide proper access for in-spection and servicing as shown in Figure 2.
4. Locate unit where operating sounds will not dis-turb owner or neighbors.
5. Locate unit so roof runoff water does not pour di-rectly on the unit. Provide gutter or other shielding at roof level. Do not locate unit in an area where exces-sive snow drifting may occur or accumulate.
6. Where snowfall is anticipated, the height of the unit above the ground level must be considered. Mount unit high enough to be above anticipated maximum area snowfall and to allow combustion air to enter the combustion air inlet.
7. Select an area which will keep the areas of the vent, air intake, and A/C condenser fins free and clear of obstructions such as weeds, shrubs, vines, snow, etc. Inform the user accordingly.

Rooftop Installation

1. Before locating the unit on the roof, make sure that the roof structure is adequate to support the weight involved. (See Electrical & Physical Tables in this manual.) THIS IS VERY IMPORTANT AND IS THE INSTALLER’S RESPONSIBILITY.
2. The location of the unit on the roof should be such as to provide proper access for inspection and servicing.

IMPORTANT: If unit will not be put into service immediately, block off supply and return air openings to prevent excessive condensation.

Corrosive Environments
The metal parts of this unit may be subject to rust or deterioration in adverse environmental conditions. This oxidation could shorten the equipment’s useful life. Salt spray, fog or mist in seacoast areas, sulphur or chlorine from lawn watering systems, and vari-ous chemical contaminants from industries such as paper mills and petroleum refineries are especially corrosive.
If the unit is to be installed in an area where contam-inants are likely to be a problem, give special atten-tion to the equipment location and exposure.

1. Avoid having lawn sprinkler heads spray directly on the unit cabinet.
2. In coastal areas, install the unit on the side of the building away from the waterfront.
3. In some situations, fencing or shrubs may give some protection against contaminants. Be mindful of the allowable clearances.

WARNING: Disconnect all power to unit before starting maintenance. Failure to do so can cause electrical shock resulting in personal injury or death. Regular maintenance will reduce the buildup of contaminants and help to protect the unit’s finish.

1. Frequent washing of the cabinet, fan blade and coil with fresh water will remove most of the salt or other contaminants that build up on the unit.
2. Regular cleaning and waxing of the cabinet with an automobile polish will provide some protection.
   Several different types of protective coatings are of-fered in some areas. These coatings may provide some benefit, but the effectiveness of such coating materials cannot be verified by the equipment manufacturer. The best protection is frequent cleaning, maintenance and minimal exposure to contaminants.

Ductwork
Ductwork should be fabricated by the installing contractor in accordance with local codes and NFPA90A. Industry manuals may be used as a guide when sizing and designing the duct system – contact Air Conditioning Contractors of America, 1513 16th St.

WARNING
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT RE-TURN DUCTWORK TO ANY OTHER HEAT PRODUCING DEVICE SUCH AS A FIREPLACE INSERT, STOVE, ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN FIRE, CARBON MONOXIDE POISONING, EXPLOSION, PROPERTY DAMAGE, SEVERE PERSONAL INJURY OR DEATH.

Place the unit as close to the space to be air conditioned as pos-sible allowing clearance dimensions as indicated. Run ducts as directly as possible to supply and return outlets. Use of non-flam-mable waterproof flexible connectors on both supply and return connections at the unit to reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if the registers or diffusers are located on the wall or in the ceiling. Consider a slab installation when the registers are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature and humidity, use a minimum of 2″ of insulation and a vapor barrier. Distribution system in attic, furred space or crawl space should be insulated with at least 2″ of insulation with vapor barrier. One-half to 1″ thickness of insulation is usually sufficient for ductwork inside the air conditioned space.
Provide balancing dampers for each branch duct in the supply system. Properly support the ductwork from the structure.

Filters
Filters are not provided with this unit. They must be supplied and installed in the return air duct by the installer. A field installed fil-ter grille is recommended for easy and convenient access to the filters for periodic inspection and cleaning. Filters must have ade-quate face area for the rated air quantity of the unit. See General Database for recommended filter size.

Condensate Drain
The indoor coil condensate drain ends with a PVC stub. A trap is provided in for proper condensate drainage and to prevent debris from being drawn into the unit. Do not connect drain to closed sewer line. It is not recommended that a PVC cement or other permanent installation be used so that the drain line and/or drain pan can be easily cleaned in the future. The drain trap is located in the control box during shipping. To install, slide clear plastic tube over drain pan connection. The white PVC trap can be oriented as required by installation.

Electrical Wiring
Electrical Wiring
Field wiring must comply with the National Electrical Code* and applicable local codes.

• C.E.C. in Canada

Power Wiring

1. It is important that proper electrical power is available at the unit. Voltage should not vary more than 10% from that stamped on the unit rating plate. On three phase units, phases must be balanced within 3%.
2. Install a branch circuit disconnect within sight of the unit and of adequate size to handle the starting current. (See Heater Kit Tables.)
3. For branch circuit wiring (main power supply to unit discon-nect), the minimum wire size can be determined from the National Electrical Code or Canadian Electrical Code or nameplate or from Heater Kit Tables.
4. This unit supports both single and dual point electrical con-nection for unit and electric heat accessory.
5. Power wiring must be run in grounded rain-tight conduit.

Power Wiring And Electrical Heater Kit

WARNING

TURN OFF ELECTRIC POWER AT THE FUSE BOX OR SERVICE PANEL BEFORE MAKING ANY ELECTRICAL CONNECTIONS.
ALSO, THE GROUND CONNECTION MUST BE COMPLETED BEFORE MAKING LINE VOLTAGE CONNECTIONS. FAILURE TO DO SO CAN RESULT IN ELECTRICAL SHOCK, SEVERE PERSONAL INJURY OR DEATH.

1. Turn off power to unit.

2. Remove control box access panel.

3. Remove unit indoor section top cover.

4. Remove wire notch cover from control bulkhead and

5. Remove heater element cover plate from blower outlet opening and discard. Retain screws.

6. Mount heater fuse block assembly in location indicated with the three included screws.

7. Route wire harness assembly through wire notch in control bulkhead and mount element assembly in blower outlet opening with screws previously retained.

8. Center wire routing plate over notch in blower bulkhead and secure with screw previously retained.

9. Route and tie wiring as shown in Figure 5. Wiring must not contact moving parts or uninsulated electrical connections.

10. Replace unit indoor top cover.

11. Connect power and control wiring as indicated below

    • Single-point wiring: Connect high voltage field power leads to heater kit fuse block and connect included unit power pigtails from heater kit fuse block to unit contactor L1 and L3 connections. Connect ground lead to ground lug on heater kit fuse block.

    • Dual-circuit wiring : Remove unit power pigtails from heater kit fuse block and discard. Connect one set of high voltage field power circuit leads to the heater kit fuse block and connect ground lead to ground lug on heater kit fuse block.
      Connect the second set of high voltage field power leads to L1 and L3 on the unit contactor. Connect ground lead to ground lug on control box bulkhead.

    • Connect heater kit control plug to receptacle in control box.

12. Replace control box access panel.

13. Restore power to unit and verify proper unit and heater kit operation.

Control Wiring (Class II)

1. Do not run low voltage wiring in conduit with power wiring.

2. Control wiring is routed through the 7/8″ hole corner adja-cent to the control box. See Electrical Connections, Figure
   Use a minimum #18 AWG thermostat wire. For wire lengths exceeding 50′, use #16 AWG thermostat wire. The low voltage wires are connected to the unit pigtails which are supplied with the unit in the low voltage connection box located within the unit control box. See Figure 5.

3. Figure 6 shows representative low voltage connection di-agrams. Read your thermostat installation instructions for any special requirements for your specific thermostat. NOTE — Units installed in Canada require that an outdoor thermostat (30,000 min. cycles of endurance) be installed and be wired with C.E.C. Class I wiring.

Internal Wiring
A diagram of the internal wiring of this unit is located on the electrical control box cover. If any of the original wire as sup-plied with the appliance must be replaced, the wire gauge and insulation must be the same as original wiring.

Grounding

WARNING
THE UNIT MUST BE PERMANENTLY GROUNDED. A GROUNDING LUG IS PROVIDED. FAILURE TO GROUND THIS UNIT CAN RESULT IN FIRE OR ELECTRICAL SHOCK CAUSING PROPERTY DAMAGE, SEVERE PERSONAL IN-JURY OR DEATH.

Thermostat
Mount the thermostat on an inside wall about five feet above the floor, in a location where it will not be affected by uncon-ditioned air, sun, or drafts from open doors or other sources. READ installation instructions in air conditioner thermostat package CAREFULLY because each has some different wiring requirements.

Indoor Airflow Data
All 208/230 volt units are equipped with multi-speed indoor blower motors. Each unit is shipped factory wired for the proper speed at a normal external static. See Airflow Performance Table for blower performance.

Pre-Start Check

1. Is unit properly located and level?
2. Is ductwork insulated, weatherproofed, with proper spacing to combustible materials?
3. Is air free to travel to and from outdoor coil? (See Figure 1.)
4. Is the wiring correct, tight, and according to unit wiring dia-gram?
5. Is unit grounded?
6. Are field supplied air filters in place and clean?
7. Do the outdoor fan and indoor blower turn freely without rubbing, and are they tight on the motor shafts?

Pre-Start Check

1. Turn thermostat to “OFF,” turn “on” power supply at disconnect switch.
2. Turn temperature setting as high as it will go.
3. Turn fan switch to “ON.”
4. Indoor blower should run. Be sure it is running in the right di-rection.
5. Turn fan switch to “AUTO.” Turn system switch to “COOL” and turn temperature setting below room temperature. Unit should run in cooling mode.
6. Is outdoor fan operating correctly in the right direction?
7. Is compressor running correctly?.
8. Turn thermostat system switch to “HEAT.” Unit should stop. Wait 5 minutes, then raise temperature setting to above room temperature. After about 30 to 50 seconds auxiliary heaters, if installed, should come on.
9. Check the refrigerant charge using the instructions located on control box cover. Replace service port caps. Service port cores are for system access only and will leak if not tightly capped.
10. Turn thermostat system switch to proper mode “HEAT” or “COOL” and set thermostat to proper temperature setting. Record the following after the unit has run some time.
    •  Operating Mode ___
    • Discharge Pressure (High) __ PSIG
    • Vapor Pressure at Compressor (Low) __ PSIG
    • Vapor Line Temperature at Compressor ___°F.
    • Indoor Dry Bulb __°F.
    • Indoor Wet Bulb _____°F.
    • Outdoor Dry Bulb ____°F.
    • Outdoor Wet Bulb ____°F.
    • Voltage at Contactor ____Volts
    • Current at Contactor ___ Amps
    • Model Number ____
    • Serial Number __
    • Location _____
    • Owner ___
    • Date ____
11. Adjust discharge air grilles and balance system.
12. Check ducts for condensation and air leaks.
13. Check unit for tubing and sheet metal rattles.
14. Instruct the owner on operation and maintenance.
15. Leave “USE AND CARE” instructions with owner.

Operation
Most single phase units are not equipped with start relay or start capacitor. It is important that such systems be off for a minimum of 5 minutes before restarting to allow equalization of pressures. Do not move the thermostat to cycle unit without waiting five minutes. To do so may cause the compressor to stop on an automatic open overload device or blow a fuse. Poor electrical service can cause nuisance tripping in overloads or blow fuses.

IMPORTANT: The compressor has an internal overload protector. Under some conditions, it can take up to 2 hours for this overload to reset. Make sure overload has had time to reset before con-demning the compressor.
These units are equipped with a time delay control (TDC1). The control allows the blower to operate for 45 to 90 seconds after the thermostat is satisfied.

Control System Operation

1. In the cooling mode, the thermostat will, on a call for cool-ing, energize the compressor contactor and the indoor blower relay. The indoor blower can be operated continu-ously by setting the thermostat fan switch at the “ON” position.
2. In the heating mode, the first heat stage of the thermostat will energize one or more supplementary resistance heat-ers. If required or considered desirable, the resistance heat may also be controlled by outdoor thermostats. In the heat-ing mode, the thermostat will, on a call for heating, energize the indoor blower relay.

GENERAL DATA

GENERAL DATA – RACB
NOMINAL SIZES 2-5 TONS [7-17.6 kW]

NOTES

1. Cooling Performance is rated at 95°F ambient, 80°F entering dry bulb, 67°F entering wet bulb. Gross capacity does not include the effect of fan motor heat. ARI capacity is net and includes the effect of fan motor heat. Units are
2. suitable for operation to ±20% of nominal cfm. Units are certified in ac-cordance with the Unitary Air Conditioner Equipment certification program, which is based on ARI Standard 210/240 or 360.
3. EER and/or SEER are rated at ARI conditions and in accordance with DOE test procedures.
4. Outdoor Sound Rating shown is tested in accordance with ARI Standard 270.
5. Standard 3/4” PVC P-Trap provided.

NOMINAL SIZES 2-5 TONS [7-17.6 kW]

[25x610x610]
Refrigerant Charge Oz. [g]| 64 [1814]| 91.04 [2581]
Weights| |
Net Weight lbs. [kg]| 357 [162]| 384 [174]
Ship Weight lbs. [kg]| 384 [174]| 411 [186]

NOTES

1. Cooling Performance is rated at 95°F ambient, 80°F entering dry bulb, 67°F entering wet bulb. Gross capacity does not include the effect of fan motor heat. ARI capacity is net and includes the effect of fan motor heat. Units are suitable for operation to ±20% of nominal cfm. Units are certified in ac-cordance with the Unitary Air Conditioner Equipment certification program, which is based on ARI Standard 210/240 or 360.
2. EER and/or SEER are rated at ARI conditions and in accordance with DOE test procedures.
3. Outdoor Sound Rating shown is tested in accordance with ARI Standard 270.
4. Standard 3/4” PVC P-Trap provided.

ELECTRICAL DATA

ELECTRICAL DATA – RACBZR SERIES

| 024AJT| 030AJT| 036AJT| 042AJT| 048AJT| 060AJT
---|---|---|---|---|---|---
Unit Information| Unit Operating Voltage Range| 187-253| 187-253| 187-253| 187-253| 187-253| 187-253
Volts| 208/230| 208/230| 208/230| 208/230| 208/230| 208/230
Phase| 1| 1| 1| 1| 1| 1
Hz| 60| 60| 60| 60| 60| 60
Minimum Circuit Ampacity| 20| 21| 24| 28| 31| 38
Minimum Overcurrent Protection Device Size| 25| 30| 35| 40| 45| 50
Maximum Overcurrent Protection Device Size| 30| 35| 40| 45| 50| 60
Compressor Motor| No.| 1| 1| 1| 1| 1| 1
Volts| 208/230| 208/230| 208/230| 208/230| 208/230| 208/230
Phase| 1| 1| 1| 1| 1| 1
RPM| 3450| 3450| 3450| 3450| 3450| 3450
HP, Compressor 1| 2| 2 1/2| 3| 3 1/2| 4| 4 1/2
Amps (RLA), Comp. 1| 10.8| 12.3| 14.7| 15.9| 18.3| 27.1
Amps (LRA), Comp. 1| 55| 63| 75| 112.3| 108| 144
HP, Compressor 2| | | | | |
Amps (RLA), Comp. 2| | | | | |
Amps (LRA), Comp. 2| | | | | |
Condenser Motor| No.| 1| 1| 1| 1| 1| 1
Volts| 208/230| 208/230| 208/230| 208/230| 208/230| 208/230
Phase| 1| 1| 1| 1| 1| 1
HP| 1/3| 1/3| 1/3| 1/3| 1/3| 1/3
Amps (FLA, each)| 1.5| 1.5| 1.5| 1.5| 1.8| 1.8
Amps (LRA, each)| 3| 3| 3| 3| 3.3| 3.3
Evaporator Fan| No.| 1| 1| 1| 1| 1| 1
Volts| 208/230| 208/230| 208/230| 208/230| 208/230| 208/230
Phase| 1| 1| 1| 1| 1| 1
HP| 1/2| 1/2| 1/2| 3/4| 3/4| 1
Amps (FLA, each)| 4.1| 4.1| 4.1| 6| 6| 7.6
Amps (LRA, each)| 3| | | | |

AIRFLOW PERFORMANCE

Nominal Cooling Capacity

Tons

| ** Motor Speed From Factory| Manufacturer Recommended Air –** Flow Range

(Min / Max) CFM

| **** Blower Size/ Motor HP

of Speeds

| &Motor Speed| | **CFM Air Delivery/RPM/Watts-208 Volts**
---|---|---|---|---|---|---
External Static Pressure-Inches W.C.
0.10| 0.20| 0.30| 0.40| 0.50| 0.60| 0.70| 0.80| –0.90| –1.00

2.0

| Low (Tap 2)| 700 / 900| **** 10×9

1/4

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 959| 892| 825| 758| 691| 624| 557| 491| –| –
RPM| 582| 606| 655| 723| 808| 851| 906| 996| –| –
Watts| 132| 110| 96| 106| 119| 123| 132| 144| |
High (Tap 1)| CFM| 1229| 1170| 1112| 1054| 996| 938| 879| 821| 763| 705
RPM| 607| 634| 698| 761| 815| 880| 946| 989| 1038| 1091
Watts| 161| 145| 159| 173| 182| 196| 210| 220| 231| 237
2.5| Low (Tap 2)| 875 / 1125| 10×9

1/3

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 1162| 1099| 1035| 972| 908| 844| 781| 717| 654| 590
RPM| 603| 626| 690| 752| 815| 906| 941| 984| 1027| 1096
Watts| 143| 124| 136| 148| 157| 175| 180| 188| 192| 202
High (Tap 1)| CFM| 1306| 1253| 1200| 1147| 1095| 1042| 989| 937| 884| 831
RPM| 632| 679| 733| 787| 841| 883| 941| 1035| 1067| 1099
Watts| 174| 187| 201| 215| 227| 235| 248| 266| 273| 277
3.0| Low (Tap 2)| 1050 / 1350| 10×9

1/2

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 1328| 1276| 1223| 1171| 1118| 1066| 1013| 961| –| –
RPM| 642| 693| 747| 803| 852| 903| 988| 1031| –| –
Watts| 173| 187| 200| 214| 226| 238| 254| 263| –| –
High (Tap 1)| CFM| 1508| 1459| 1409| 1359| 1310| 1260| 1210| 1160| 1111| 1061
RPM| 698| 738| 789| 839| 888| 933| 983| 1035| 1103| 1137
Watts| 243| 255| 271| 285| 299| 310| 322| 332| 343| 343
3.5| Low (Tap 2)| 1225 / 1575| 11×9

1/2

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 1531| 1477| 1423| 1370| 1316| 1262| 1208| 1154| 1101| 1047
RPM| 602| 619| 668| 715| 757| 801| 844| 878| 918| 954
Watts| 238| 227| 236| 251| 266| 281| 296| 307| 320| 333
High (Tap 1)| CFM| 1724| 1678| 1632| 1586| 1540| 1495| 1449| 1403| 1357| 1311
RPM| 639| 671| 715| 759| 794| 834| 875| 911| 948| 977
Watts| 295| 309| 330| 348| 363| 380| 397| 414| 429| 440

4.0

| ****

Low (Tap 2)

| 1400 / 1800| 11×9

3/4

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 1708| 1658| 1609| 1559| 1510| 1460| 1410| 1361| 1311| 1262
RPM| 619| 651| 686| 741| 783| 822| 859| 894| 937| 971
Watts| 280| 284| 298| 323| 339| 355| 370| 385| 402| 415
High (Tap 1)| CFM| 1917| 1872| 1827| 1782| 1736| 1691| 1646| 1601| 1556| 1510
RPM| 673| 702| 736| 769| 818| 860| 898| 928| 960| 989
Watts| 377| 392| 409| 426| 451| 473| 490| 504| 518| 531

5.0

| Low (Tap 2)| 1750 / 2250| 11×9

3/4

2 Speed (X-13 Motor)

| Low (Tap 2)| CFM| 1954| 1914| 1874| 1833| 1793| 1753| 1713| 1673| 1632| 1592
RPM| 719| 747| 779| 818| 857| 894| 928| 963| 998| 1038
Watts| 439| 451| 469| 491| 512| 534| 553| 573| 590| 611
High

(Tap 1)

| CFM| 2173| 2136| 2098| 2061| 2024| 1986| 1949| 1911| 1874| 1837
RPM| 775| 803| 830| 860| 896| 928| 959| 988| 1019| 1050

HEATER KIT CHARACTERISTICS

AUXILIARY ELECTRIC HEATER KITS CHARACTERISTICS AND APPLICATION – RACB

208/240 VOLT, SINGLE PHASE, 60 Hz, AUXILIARY ELECTRIC HEATER KITS CHARACTERISTICS AND APPLICATION

Single Power Supply for Both Unit and Heater Kit| Separate Power Supply for Both Unit and Heater Kit
RHEEM Model Number| Heater Kit| Air Conditioner| Heater Kit| Air Conditioner
RXQJ-

Heater Kit Nominal kW

| No. of Sequence Steps| Rated Heater kW @ 208/240 V| Heater KBTU/Hr @ 208/240 V| Heater Amp. @ 208/240 V| Unit Min. Ckt.

Ampacity @ 208/240 V

| Over Current Protective Device Size| Min. Ckt. Ampacity 208/240V| Max. Fuse Size 208/240V| **** Min. Circuit Ampacity 208/240V| Over Current Protective Device Size
Min./Max. @ 208 V| Min./Max. @ 240 V| Min./Max. @ 208 V| Min./Max. @ 240 V
RACBZR024AJT| No Heat| —–| —–| —–| —–| 20/20| 25/30| 25/30| —–| —–| 20/20| 25/30| 25/30
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 27/31| 30/30| 35/35| 22/25| 25/25| 20/20| 25/30| 25/30
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 38/43| 40/40| 45/45| 33/38| 35/40| 20/20| 25/30| 25/30
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 49/56| 50/50| 60/60| 44/50| 45/50| 20/20| 25/30| 25/30
RACBZR030AJT| No Heat| —–| —–| —–| —–| 21/21| 30/35| 30/35| —–| —–| 21/21| 30/35| 30/35
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 27/31| 30/35| 35/35| 22/25| 25/25| 21/21| 30/35| 30/35
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 38/43| 40/40| 45/45| 33/38| 35/40| 21/21| 30/35| 30/35
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 49/56| 50/50| 60/60| 44/50| 45/50| 21/21| 30/35| 30/35
| C15J| 1| 10.8/14.4| 36.85/49.13| 52.0/60.0| 71/81| 80/80| 90/90| 65/75| 70/80| 21/21| 30/35| 30/35
RACBZR036AJT| No Heat| —–| —–| —–| —–| 24/24| 35/40| 35/40| —–| —–| 24/24| 35/40| 35/40
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 27/31| 35/40| 35/40| 22/25| 25/25| 24/24| 35/40| 35/40
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 38/43| 40/40| 45/45| 33/38| 35/40| 24/24| 35/40| 35/40
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 49/56| 50/50| 60/60| 44/50| 45/50| 24/24| 35/40| 35/40
| C15J| 1| 10.8/14.4| 36.85/49.13| 52.0/60.0| 71/81| 80/80| 90/90| 65/75| 70/80| 24/24| 35/40| 35/40
RACBZR042AJT| No Heat| —–| —–| —–| —–| 28/28| 40/45| 40/45| —–| —–| 28/28| 40/45| 40/45
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 30/33| 40/45| 40/45| 22/25| 25/25| 28/28| 40/45| 40/45
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 40/45| 40/45| 45/45| 33/38| 35/40| 28/28| 40/45| 40/45
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 51/58| 60/60| 60/60| 44/50| 45/50| 28/28| 40/45| 40/45
| C15J| 1| 10.8/14.4| 36.85/49.13| 52.0/60.0| 73/83| 80/80| 90/90| 65/75| 70/80| 28/28| 40/45| 40/45
| C20J| 1| 14.4/19.2| 49.13/65.51| 69.3/80.0| 95/108| 100/100| 110/110| 87/100| 90/100| 28/28| 40/45| 40/45
RACBZR048AJT| No Heat| —–| —–| —–| —–| 31/31| 45/50| 45/50| —–| —–| 31/31| 45/50| 45/50
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 31/33| 45/50| 45/50| 22/25| 25/25| 31/31| 45/50| 45/50
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 40/45| 45/50| 45/50| 33/38| 35/40| 31/31| 45/50| 45/50
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 51/58| 60/60| 60/60| 44/50| 45/50| 31/31| 45/50| 45/50
| C15J| 1| 10.8/14.4| 36.85/49.13| 52.0/60.0| 73/83| 80/80| 90/90| 65/75| 70/80| 31/31| 45/50| 45/50
| C20J| 1| 14.4/19.2| 49.13/65.51| 69.3/80.0| 95/108| 100/100| 110/110| 87/100| 90/100| 31/31| 45/50| 45/50
RACBZR060AJT| No Heat| —–| —–| —–| —–| 38/38| 50/60| 50/60| —–| —–| 38/38| 50/60| 50/60
| C05J| 1| 3.6/4.8| 12.28/16.38| 17.3/20.0| 38/38| 50/60| 50/60| 22/25| 25/25| 38/38| 50/60| 50/60
| C07J| 1| 5.4/7.2| 18.43/24.57| 26.0/30.0| 42/47| 50/60| 50/60| 33/38| 35/40| 38/38| 50/60| 50/60
| C10J| 1| 7.2/9.6| 24.57/32.76| 34.7/40.0| 53/60| 60/60| 60/60| 44/50| 45/50| 38/38| 50/60| 50/60
| C15J| 1| 10.8/14.4| 36.85/49.13| 52.0/60.0| 75/85| 80/80| 90/90| 65/75| 70/80| 38/38| 50/60| 50/60
| C20J| 1| 14.4/19.2| 49.13/65.51| 69.3/80.0| 97/110| 100/100| 110/110| 87/100| 90/100| 38/38| 50/60| 50/60

WIRING DIAGRAMS

FIGURE 7.
WIRING DIAGRAM- RSNM

2 THRU 5 TON

|

LOW

|

HIGH

| LOW (TAP 1)
HIGH (TAP 2)

WIRING INFORMATION

• FACTORY STANDARD
• FACTORY OPTION
• FIELD INSTALLED

LOW VOLTAGE

• FACTORY STANDARD
• FACTORY OPTION
• FIELD INSTALLED

REPLACEMENT WIRE

• MUST BE THE SAME SIZE AND TYPE OF INSULATION AS ORIGINAL (105C. MIN.)

WARNING

• CABINET MUST BE PERMANENTLY GROUNDED AND CONFORM TO I .E.C., N.E.C., C.E.C., NATIONAL WIRING REGULATIONS, AND LOCAL CODES AS APPLICABLE.

NOTES

1. CONNECTORS SUITABLE FOR USE WITH COPPER CONDUCTORS ONLY.
2. COMPRESSOR MOTOR THERMALLY PROTECTED.
3. TRANSFORMER FACTORY WIRED FOR 230 VOLTS. USE RED AND BLUE LEADS FOR 208 VOLTS.
4. MOTOR FACTORY WIRED FOR LOW SPEED. SEE AIRFLOW TABLES IN INSTALLATION INSTRUCTIONS TO DETERMINE CORRECT SPEED FOR UNIT APPLICATION.
5. FIELD WIRING OR CONNECTION FROM HEATER KIT FUSE BLOCK.
6. PL2 & PL3 ARE CONNECTED WHEN LAC IS NOT PRESENT.

COMPONENT CODES

• ALC…………….
• BR………………
• CC………………
• CCH……………
• COMP…………
• CT……………….
• GND……………
• HPC……………
• IBM……………..
• LAC……………..
• OFM……………
• OPT……………..
• PL……………….
• RC………………
• TB……………….
• TDC…………….
• ……………..
• AUX. LIMIT CONTROL
• BLOWER RELAY
• COMPRESSOR CONTACTOR
• CRANKCASE HEATER
• COMPRESSOR
• CONTROL TRANSFORMER
• GROUND
• HIGH PRESSURE CONTROL
• INDOOR BLOWER MOTOR
• LOW AMBIENT COOLING
• CONTROL
• OUTDOOR FAN MOTOR
• OPTIONAL
• PLUG
• RUN CAPACITOR
• TERMINAL BLOCK
• TIME DELAY CONTROL
• WIRE NUT

WIRE COLOR CODE

• BK……BLACK
• BR……BROWN
• BL…….BLUE
• G……..GREEN
• GY……GRAY
• O……..ORANGE
• PR……PURPLE
• R……..RED
• W…….WHITE
• Y……..YELLOW

ELECTRICAL WIRING DIAGRAM
AC 024/030/036/042/048/060
1 PH 208-230V 60HZ

• APPROVED
• CHECKED
• MODELED BY
• MAB DATE
• 8/9/2022 PART NO
• 90-23637-24 ORIGINAI BELFASE NO
• 107151 REV : 00

TROUBLESHOOTING CHART

WARNING
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.

• Power off or loose electrical connection

• Thermostat out of calibration-set too high

• Defective contactor

• Blown fuses

• Transformer defective
  High pressure control

• open (if provided)
  Interconnecting low voltage wiring damaged

|

• Check for correct voltage at compressor contactor in control box
• Reset
• Check for 24 volts at contactor coil – replace if contacts are open
• Replace fuses
• Check wiring-replace transformer
• Reset-also see high head pressure remedy-The high pressure control opens at 450 PSIG
• Replace thermostat wiring

Condenser fan runs, compressor doesn’t|

• Run or start capacitor defective (single phase only)
• Start relay defective (single phase only)
• Loose connection
•  Compressor stuck, grounded or open motor winding, open internal overload.
• Low voltage condition
•  Low voltage condition

|

• Replace

• Replace

• Check for correct voltage at compressor – check & tighten all connections

• Wait at least 2 hours for overload to reset. If still open, replace the compressor.
  At compressor terminals, voltage must be within 10% of rating plate volts when unit is operating.

• Add start kit components

Insufficient cooling|

• Improperly sized unit
• Improper airflow
• Incorrect refrigerant charge
• Air, non-condensibles or moisture in system
• Incorrect voltage

|

• Recalculate load
• Check – should be approximately 400 CFM per ton.
• Charge per procedure attached to unit service panel
• Recover refrigerant, evacuate & recharge, add filter drier
• At compressor terminals, voltage must be within 10% of rating plate volts when unit is operating.

Compressor short cycles|

• Incorrect voltage
• Defective overload protector
• Refrigerant undercharge

|

• At compressor terminals, voltage must be ±10% of nameplate marking when unit is operating.
• Replace – check for correct voltage
• Add refrigerant

Registers sweat|

• Low evaporator airflow

|

• Increase speed of blower or reduce restriction – replace air filter

High head-low vapor pressures|

• Restriction in liquid line, expansion device or filter drier
• Flow check piston size too small
• Incorrect capillary tubes
• TXV does not open

|

• Remove or replace defective component
• Change to correct size piston
• Change coil assembly
• Replace TXV

High head-high or normal vapor pressure – Cooling mode|

• Dirty condenser coil
• Refrigerant overcharge
• Condenser fan not running
• Air or non-condensibles in system

|

• Clean coil
• Correct system charge
• Repair or replace
• Recover refrigerant, evacuate & recharge

High head-high or normal vapor pressure – Heating mode|

• Low air flow – condenser coil
• Refrigerant overcharge
• Air or non-condensibles in system
• Dirty condenser coil

|

• Check filters – correct to speed
• Correct system charge
• Recover refrigerant, evacuate & recharge
• Check filter – clean coil

Low head-high vapor pressures|

• Flow check piston size too large
• Defective Compressor valves
• Incorrect capillary tubes

|

• Change to correct size piston
• Replace compressor
• Replace coil assembly

Low vapor – cool compressor – iced evaporator coil|

• Low evaporator airflow
•  Operating below 65°F outdoors
• Moisture in system
• TXV limiting refrigerant flow

|

• Increase speed of blower or reduce restriction – replace air filter
• Add Low Ambient Kit
• Recover refrigerant – evacuate & recharge – add filter drier
• Replace TXV

High vapor pressure|

• Excessive load
• Defective compressor

|

• Recheck load calculation
• Replace

Fluctuating head & vapor pressures|

• TXV hunting
• Air or non-condensate in system

|

• Check TXV bulb clamp – check air distribution on coil – replace TXV
• Recover refrigerant, evacuate & recharge

Gurgle or pulsing noise at expansion device or liquid line|

• Air or non condensable in system

|

• Recover refrigerant, evacuate & recharge

References

• NFPA.ORG
• My Canadian Pharmacy: Looking After Your Wellbeing

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