Mars Comfort-Aire Century SE Series Instruction Manual
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Mars Comfort-Aire Century SE Series Instruction Manual

Split system heat pump
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INSTALLER'S GUIDE
CONDENSING UNITS
Split System Heat Pump
Split System Heat Pump
1.5-5 Tons
UP TO 15.2 SEER2
R410a
Instruction Manual
Thank you very much for purchasing our product.
Before using your unit, please read this manual carefully and keep it for future reference.
The figure shown in this manual is for reference only and may be slightly different from the actual product.
517.787.2100 • www.marsdelivers.com
SE Series
RSH15xxS1A

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  • Page 1 INSTALLER’S GUIDE CONDENSING UNITS SE Series Split System Heat Pump Split System Heat Pump 1.5-5 Tons UP TO 15.2 SEER2 R410a RSH15xxS1A Instruction Manual Thank you very much for purchasing our product. Before using your unit, please read this manual carefully and keep it for future reference. The figure shown in this manual is for reference only and may be slightly different from the actual product.

  • Page 2: Table Of Contents

    RSH15xxS1A Instruction Manual Split System Heat Pump RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY INFORMATION WARNING WARNING These instructions are intended as an aid to qualified licensed service personnel for proper installation, adjust- ment and operation of this unit. Read these instructions thoroughly before attempting installation, or operation. Failure to follow these instructions may result in improper installation, adjustment, service, or maintenance possibly resulting in fire, electrical shock, property damage, personal injury, or death.
  • Page 3 Split System Heat Pump RSH15xxS1A Instruction Manual 8 REFRIGERANT LINE LEAK CHECK Check for Leaks 9 EVACUATION Evacuate the Refrigerant Lines and Indoor Coil 10 SERVICE VALVES 10.1 Open the Service Valves 11 ELECTRICAL - LOW VOLTAGE 11.1 Low Voltage Maximum Wire Length 11.2 Low Voltage Hook-up Diagrams 12 ELECTRICAL - HIGH VOLTAGE...

  • Page 4: Key To Symbols And Safety Instructions

    RSH15xxS1A Instruction Manual Split System Heat Pump 1 KEY TO SYMBOLS AND These units use R-410a refrigerant which operates SAFETY INSTRUCTIONS at 50% to 70% higher pressures than R-22. Use only R-410a approved service equipments. Refrig- erant cylinders are painted a “Rose” color to 1.1 Key to Symbols indicate the type of refrigerant and may contain a “dip”...

  • Page 5: Unit Location Considerations

    Split System Heat Pump RSH15xxS1A Instruction Manual 2 UNIT LOCATION Cold climate considerations (heat pump only) CONSIDERATIONS NOTE 2.1 Unit Dimensions Precautions must be taken for units being installed in areas where snow accumulation and prolonged below-freezing temperatures occur. Unit Dimensions Model H(inches) W(inches)

  • Page 6: Unit Preparation

    RSH15xxS1A Instruction Manual Split System Heat Pump The pad must be at least 1-2" larger than the unit on all sides. The pad must be separate from any structure. Min. 12" The pad must be level. Snow barrier The pad must be high enough above grade to allow for drainage.

  • Page 7: Refrigerant Line Considerations

    Split System Heat Pump RSH15xxS1A Instruction Manual 5 REFRIGERANT LINE Total suction line length Suction Model CONSIDERATIONS (inches) Coefficient 0.94 0.90 1.00 0.97 0.95 0.92 5.1 Service Valve Connection Sizes 1.00 0.98 1.00 0.97 0.94 0.90 1.00 0.98 0.95 0.92 Suction line Liquid line 1.00...

  • Page 8: Refrigerant Line Routing

    RSH15xxS1A Instruction Manual Split System Heat Pump Required Optional Insulated Liquid Line Figure 5-3 Insulated Suction Line Tape Sheet Metal Hanger 6 REFRIGERANT LINE ROUTING Figure 5-3 6.1 Precautions NOTE 5.5 Existing Refrigerant Lines Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines.
  • Page 9 Split System Heat Pump RSH15xxS1A Instruction Manual 8 Feet Maximum Jo ist/Raft er Isolator Side View 8 Feet Maximum Line Set Secure Suction line from joists using isolators every 8 feet. Secure Liquid Line directly to Suction line using tape, wire, or other appropriate method every 8 feet. Jo ist/Raft er Isolation In Spaces...

  • Page 10: Refrigerant Line Brazing

    RSH15xxS1A Instruction Manual Split System Heat Pump 7 REFRIGERANT LINE BRAZING 4. Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge (Fig. 7-4). 7.1 Braze The Refrigerant Lines Braze the refrigerant lines to the service valves. 1.

  • Page 11: Refrigerant Line Leak Check

    Split System Heat Pump RSH15xxS1A Instruction Manual 8 REFRIGERANT LINE LEAK 9 EVACUATION CHECK 9.1 Evacuate the Refrigerant Lines and Indoor Coil 8.1 Check For Leaks 1. Pressurize the refrigerant lines and evaporator coil NOTE to 150 PSIG using dry nitrogen. Do not open the service valves until the 150 PSIG refrigerant lines and indoor coil leak check and...

  • Page 12: Service Valves

    RSH15xxS1A Instruction Manual Split System Heat Pump 10 SERVICE VALVES 10.1 Open the Service Valves 5/16” Hex Wrench for Sucti on Service Valve WARNING 3/16” Hex Wrench Unit S ide for Liqu id Service Valve of Service Extreme caution should be exercised when Valve opening the Liquid Line Service Valve.
  • Page 13 Split System Heat Pump RSH15xxS1A Instruction Manual Support 2H thermostat Support 3H thermostat THERMOSTAT THERMOSTAT w1 w2 w1 w2 INDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT INDOOR UNIT Control Wiring for 18K-60K HP Systems Figure 11-2 Notes: “-----”The electric auxiliary heat connection (optional). W :Electric auxiliary heat signal.

  • Page 14: Electrical - High Voltage

    RSH15xxS1A Instruction Manual Split System Heat Pump 2. After installation or maintenance, the tie or rubber ring should be tightened, do not loose or discarded; the control box access panel must be installed and the screws must be tightened. 12.2 High Voltage Disconnect 12 ELECTRICAL - HIGH VOLTAGE Switch Install a separate disconnect switch at the outdoor unit.

  • Page 15: Start Up

    Split System Heat Pump RSH15xxS1A Instruction Manual 14 SYSTEM CHARGE 13 START UP ADJUSTMENT 13.1 System Start Up 14.1 Charging: Weigh-In Method 1. Ensure Sections 7, 8, 9, 10, 11, and 12 have been completed. Weigh-In method can be used for the initial installation, or anytime a system charge is being replaced.

  • Page 16: (Above 55°F Outdoor Temp.)

    RSH15xxS1A Instruction Manual Split System Heat Pump 14.2 Suction Line Pressure 2. Ensure Sections 7, 8, 9, 10,11,12 and 13 have been completed. Charging And Refrigerant Adjustment In Coiling (above 55°F outdoor temp.) 3. Stabilize the system by operating for a minimum of 20 minutes.
  • Page 17 Split System Heat Pump RSH15xxS1A Instruction Manual Design superheat with TXV Indoor Unit Inlet DB/WB (°F) Outdoor DB (°F) 95/79 90/75 85/71 80/67 75/63 70/58 Design superheat with piston Indoor Unit Inlet DB/WB (°F) Outdoor DB (°F) 95/79 90/75 85/71 80/67 75/63 70/58...
  • Page 18 RSH15xxS1A Instruction Manual Split System Heat Pump 24K HP with Piston Add 4° of Superheat Add 6° of Superheat Add 2° of Superheat Add 4° of Superheat Add 8° of Superheat Use Design Superheat Value Add 2° of Superheat Add 6° of Superheat Total Refrigerant Line Length-feet 30K HP with Piston Add 2°...
  • Page 19 Split System Heat Pump RSH15xxS1A Instruction Manual 42K HP with TXV Add 4° of Superheat Add 2° of Superheat Add 6° of Superheat Add 8° of Superheat Add 4° of Superheat Use Design Superheat Value Add 6° of Superheat Total Refrigerant Line Length-feet 48K HP with TXV Add 4°...
  • Page 20 RSH15xxS1A Instruction Manual Split System Heat Pump 5. Use the final superheat value, refrigerant temperature and pressure from STEP 4, to determine the proper suction gauge pressure using Table 14-1. Example: Assume a 12º F final superheat value and suction temp of 58º F. 1.

  • Page 21: System Operation And Troubleshooting

    Split System Heat Pump RSH15xxS1A Instruction Manual 15 SYSTEM OPERATION AND NOTE TROUBLESHOOTING In stand-by status, the compressor will not start in low pressure protection. Within 30 minutes, if 15.1 Compressor Crankcase Heater 4 protection cycles occur. The system will be locked.

  • Page 22: Two-Stage Compressor (61K Hp Only)

    RSH15xxS1A Instruction Manual Split System Heat Pump 15.5 Two-stage Compressor (61K HP only) The 61K HP Systems feature a Two-stage scroll compressor which is controlled by Y1 and Y2. Y1: 24VAC thermostat input for first stage operation of the unit. Y2: 24VAC thermostat input/output for second stage operation of the unit.

  • Page 23: Electrical Data Table

    Split System Heat Pump RSH15xxS1A Instruction Manual 15.8 Troubleshooting Table SYSTEM FAULTS REFRIGERANT CIRCUIT Head Pressure Too High Head Pressure Too Low Suction Pressure Too High Suction Pressure Too Low Liquid Refrig. Floodback (TXV) I.D. Coil Frosting Compressor Runs Inadequate or No Cooling/Heating ELECTRICAL Compressor &...

  • Page 24: Warranty

    RSH15xxS1A Instruction Manual Split System Heat Pump 15.9.2 For 61K HP System STEADY ON NORMAL OPERATION DFC FAILURE 1FLASH T3 SENSOR FAILURE 2FLASH T4 SENSOR FAILURE OR HGS OPEN 3FLASH LPC OPEN 5FLASH OFM FAILURE 16 WARRANTY Assist owner with processing Warranty cards and/or online registration. 16.1 Maintenance Dirt should not be allowed to accumulate on the indoor or outdoor coils or other parts in the air circuit.

  • Page 25: Changing Motor

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  • Page 27 STANDARD SERIES LIMITED EXPRESS WARRANTY COVERAGE Congratulations on purchasing your new HVAC equipment. It has been designed for long life and reliable service. Your unit automatically qualifies for the warranty coverage listed below, provided you keep your proof of purchase (receipt) for the equipment and meet the warranty conditions.
  • Page 28 12/23...

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