Carrier FB4CN 38mura Crossover Instructions

38MURA CROSSOVER
WIRING INSTRUCTIONS
REV 00

IMPORTANT

• Please reference 38MURA Installation Instructions for complete instruction. This document provides additional wiring scenarios based on the indoor unit being installed to.
• Please read the entire instructions manual before starting the installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all wamings or cautions mcluded in literature and attached to the unit. Consult local building codes and current editions of the National Electrical Code (NEC) NFPA 70. In Canada, refer to current editions of the Canadian Electrical Code CSA 22.1.
Recognize safety information. This is the safety-alert symbol When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death, WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

WARNING
ELECTRICAL SHOCK HAZARD
Fanlure to tollow this warning could result in personal inqury or death. Before installing. modifving. or servicing: svstem. main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag swatch wath a suitable warming label.
WARNING
EXPLOSION HAZARD
Failure to follow this waming could result in death, senous personal inqury. death. and or property damage.
Never use air or any gas containing ovsyven for leak testing oor operating refrigerant compressars. Never allow compressor suchon pressure to operate ina vacuum with semice Valves closed. See Service Manual tor purnp-dow n instructions.

38MURA CROSSOVER SOLUTIONS

• Compatible with most Comfort and Performance fan coils and furnaces with both A and N type coils
• Capacity Ranges: 1.5T, 2T, 2.5T, 3T, 4T & 5T
• Available in regular heat and high heat options
• Utilizes standard line set sizes (insulation of suction line only), integrated 24V interface connection

COMPATIBILITY

Depending on size, 38MURA is compatible with the ollowing fan coils and urnaces. Refer to MyCarrierRatings to access all compatible combinations and performance information.

38MURA WITH APPROVED SINGLE-STAGE FURNACES

Applies To:

• 59SU-ULTRA LOW NOX
• 58S(B,C)& 59SC-COMFORT SERIES

Notes:

• ‘O/B’ ENERGIZED ON HEATING
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE
• MUST USE DUAL FUEL THERMOSTAT FOR ALL FURNACE COMBINATIONS. SIMULTANEOUS HEAT PUMP AND FURNACE OPERATION NOT PERMITTED.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

38MURA WITH APPROVED SINGLE/TWO STAGE FURNACES

Applies To:

• 58SP,59SP-PERFORMANCE SERIES
• 58SU-ULTRA LOW NOX
• 58TP & 59TP-PERFORMANCE SERIES
• OVL and OVM Oil Furnaces

Notes:

• O/B’ ENERGIZED ON HEATING
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE
• MUST USE DUAL FUEL THERMOSTAT FOR ALL FURNACE COMBINATIONS. SIMULTANEOUS HEAT PUMP AND FURNACE OPERATION NOT PERMITTED.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

38MURA WITH APPROVED SINGLE SPEED FAN COIL

Applies To:

• FMA4

Notes:

• O/B’ ENERGIZED ON HEATING
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

Applies To:

• FJ4
• FB4C
• FX4D
• PF4M

Notes:

• O/B’ ENERGIZED ON HEATING
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

Applies To:

• FV4CN(B,F)

Notes:

• O/B’ ENERGIZED ON HEATING
• RECOMMEND ‘HP-EFF’ SETTING ON EASY SELECT BOARD
• OPTIONAL HUMIDIFICATION AND DEHUMIDIFICATION SETUP NOT SHOWN. REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

Applies To:

• FZ4ANP

Notes:

• O/B’ ENERGIZED ON HEATING
• ‘Y1’ TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMP-UP” RATE.
• REFER TO INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION

Applies To:

• FMC

Notes:

• O/B’ ENERGIZED ON HEATING
• SIMULTANEOUS HEAT PUMP AND ELECTRIC HEATING NOT ALLOWED
• REFERENCE INDOOR UNIT LITERATURE FOR ADDITIONAL INFORMATION ON USE OF DROPOUT RELAY
• HEAT PUMP THERMOSTAT MUST BE USED. CONVENTIONAL THERMOSTAT NOT PERMITTED
• DO NOT USE “W” TERMINAL AT ODU
• ‘Y1’TERMINAL AT OUTDOOR UNIT MAY OPTIONALLY BE USED INSTEAD OF ‘Y2’ FOR A SLOWER COMPRESSOR “RAMPUP” RATE.

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