The MITS AIR™ Inverter Compressor Heat Pump is designed for heating and cooling applications, offering a versatile solution for residential and commercial spaces. This manual covers installation and service procedures for models with an interface (MA24VA2) that connects to existing Air Handling Units (AHU), Fancoils, or Furnaces.
Function Description:
The MITS AIR™ Inverter Compressor Heat Pump operates as a two-stage heat/cool system, providing efficient temperature control. The inverter technology allows for variable compressor speed, optimizing energy consumption and maintaining consistent indoor temperatures. It is designed to integrate with existing HVAC infrastructure, making it suitable for retrofits or new installations where an existing AHU, fancoil, or furnace is present. The system utilizes fluorinated gases (R410A) as a refrigerant.
Important Technical Specifications:
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Models Covered:
- MOB30-12HFN1-MSOW: 1 Ton
- MOB31-24HFN1-MTOW: 2 Ton (Energy Star rated)
- MOD30-30HFN1-MROW: 2.5 Ton
- MOD30U-36HFN1-MX: 3 Ton
- MOE30U-48HFN1-MX: 4 Ton
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Power Supply (All Models): Ph-V-Hz: 208~230~1~60 VAC
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Cooling Specifications:
- MOB30-12HFN1-MSOW (1 Ton): Capacity: 12,000 Btu/h, Rated Current: 4.5 A, EER: 11.0 Btu/w, SEER: 19.0 Btu/w
- MOB31-24HFN1-MTOW (2 Ton): Capacity: 22,000 Btu/h, Rated Current: 8.1 A, EER: 12.5 Btu/w, SEER: 20.8 Btu/w
- MOD30-30HFN1-MROW (2.5 Ton): Capacity: 30,000 Btu/h, Rated Current: 12.5 A, EER: 10.5 Btu/w, SEER: 18.0 Btu/w
- MOD30U-36HFN1-MX (3 Ton): Capacity: 36,000 Btu/h, Rated Current: 19.0 A, EER: 8.5 Btu/w, SEER: 16.5 Btu/w
- MOE30U-48HFN1-MX (4 Ton): Capacity: 48,000 Btu/h, Rated Current: 26.0 A, EER: 8.2 Btu/w, SEER: 16.0 Btu/w
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Heating Specifications:
- MOB30-12HFN1-MSOW (1 Ton): Capacity: 12,000 Btu/h, Rated Current: 4.3 A, COP: 3.43 W/W, HSPF5: 8.0 Btu/w
- MOB31-24HFN1-MTOW (2 Ton): Capacity: 26,000 Btu/h, Rated Current: 10.13 A, COP: 3.50 W/W, HSPF5: 8.4 Btu/w
- MOD30-30HFN1-MROW (2.5 Ton): Capacity: 30,000 Btu/h, Rated Current: 13.5 A, COP: 2.83 W/W, HSPF5: 8.1 Btu/w
- MOD30U-36HFN1-MX (3 Ton): Capacity: 39,000 Btu/h, Rated Current: 15.5 A, COP: 3.20 W/W, HSPF5: 8.4 Btu/w
- MOE30U-48HFN1-MX (4 Ton): Capacity: 55,000 Btu/h, Rated Current: 27.14 A, COP: 2.63 W/W, HSPF5: 7.5 Btu/w
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Electrical Wiring:
- MIN. CIRCUIT AMPACITY: 15 A (1 Ton), 18 A (2 Ton), 20 A (2.5 Ton), 30 A (3 Ton), 36.5 A (4 Ton)
- MAX. FUSE: 15 A (1 Ton), 25 A (2 Ton), 30 A (2.5 Ton), 45 A (3 Ton), 50 A (4 Ton)
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Compressor Type: All models use ROTARY INVERTER compressors.
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Outdoor Fan Motor RLA: 0.39 A (1 Ton), 0.6 A (2, 2.5, 3, 4 Ton)
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Outdoor Air Flow (CFM): 1176 (1 Ton), 2237 (2 Ton), 2530 (2.5, 3 Ton), 4470 (4 Ton)
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Outdoor Noise Level: 55 dB(A) (1 Ton), 59 dB(A) (2 Ton), 62 dB(A) (2.5 Ton), 64 dB(A) (3, 4 Ton)
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Outdoor Unit Dimensions (W x D x H):
- MOB30-12HFN1-MSOW: 31.50 x 13.11 x 21.81 inches
- MOB31-24HFN1-MTOW, MOD30-30HFN1-MROW, MOD30U-36HFN1-MX: 37.24 x 16.14 x 31.89 inches
- MOE30U-48HFN1-MX: 37.48 x 16.34 x 52.48 inches
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Net/Gross Weight:
- MOB30-12HFN1-MSOW: 67.0/72.75 lbs
- MOB31-24HFN1-MTOW: 141.09/152.12 lbs
- MOD30-30HFN1-MROW: 137.79/147.71 lbs
- MOD30U-36HFN1-MX: 155.42/166.23 lbs
- MOE30U-48HFN1-MX: 219.14/249.12 lbs
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Refrigerant (R410-A):
- Precharge Length: 25 ft for all models.
- Additional Charge (5 ft): 0.8 oz (1 Ton), 1.6 oz (2, 2.5, 3, 4 Ton)
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Line Set (Liquid/Gas):
- MOB30-12HFN1-MSOW: Φ6.35/Φ12.7 (1/4"/1/2")
- All other models: Φ9.52/Φ15.9 (3/8"/5/8")
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Refrigerant Piping:
- Max. Pipe Length: 82 ft (1 Ton), 164 ft (2, 2.5 Ton), 213 ft (3, 4 Ton)
- Max. Difference in Level: 33 ft (1 Ton), 82 ft (2, 2.5 Ton), 98 ft (3, 4 Ton)
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Operation Temperature (Outdoor Cooling/Heating):
- MOB30-12HFN1-MSOW, MOD30U-36HFN1-MX, MOE30U-48HFN1-MX: 5~122°F / 5~86°F
- MOB31-24HFN1-MTOW, MOD30-30HFN1-MROW: -13~122°F / -13~86°F
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Additional Features: Defrost Pan Heater included, Outdoor Unit includes Interface module MA24VA2.
Usage Features:
- Thermostat Compatibility: Requires a 2-stage heat/cool thermostat configured for "Electric Furnace" type to ensure fan operation with first stage heat. Two-stage cooling can utilize fan speed changes on EC motor systems.
- Interface Installation: The interface must be installed within 10 feet of the furnace return plenum and not outdoors.
- Return Air Sensor: Must be installed in the return air plenum upstream from any device that may cause temperature differences (e.g., humidifier) and connected to the extension wire with a ferrite core.
- Dip Switch Configuration: Dip switches on the interface must be configured according to the appropriate wiring diagrams. Power must be reset after any switch changes for the computer to read them.
- Display Codes: The interface display shows "00" when booted up, "01" on a cooling call, and "00" or "03" (stand-by) upon call completion. Other numbers indicate incorrect dip switch settings or an error.
- Minimum Pipe Run: A minimum pipe run of 3 meters (10 ft) is required to minimize vibration and excessive noise.
- Outdoor Unit Placement: Requires specific clearances (e.g., 30cm on left, 60cm above/right, 200cm in front) and protection from direct sunlight, rain, or snow. Heat pumps must be elevated a minimum of 18 inches off grade/roof for proper winter defrost operation.
- Extreme Weather: Units in proximity to salt water or corrosive substances require special coating. Wind baffles may be needed in areas with extremely heavy winds.
Maintenance Features:
- Leak Testing: Mandatory leak testing must be performed in compliance with all applicable Federal, Provincial, and Municipal statutes, regulations, codes, and bylaws in Canada. Proper record-keeping of all checks is strongly recommended.
- Pressure Testing & Evacuation: This procedure is intended for certified professionals due to the use of high-pressure gases. The maximum test pressure for the indoor coil should not exceed 450 psig. Dry nitrogen is used for pressure testing, followed by evacuation using a vacuum pump to remove condensable gases and moisture.
- Refrigerant Charge Adjustment: If the liquid line length exceeds 25 feet, consult the charge sheet for refrigerant adjustment.
- Electrical Safety: All electrical work must comply with local and national electrical codes and be performed by a licensed electrician. A CSA certified surge protector is recommended.
- Wiring Connections: All wires must be firmly connected to prevent overheating and malfunction. Wires should not touch refrigerant tubing, the compressor, or moving parts.
- Regular Servicing: An authorized and appropriately licensed service technician must be contacted for repair or maintenance.
- Product Uninstallation and Recycling: Must be performed by a certified technician in accordance with applicable Federal, Provincial, and Municipal requirements.
Warranty:
MITS AIRCONDITIONING INC. provides a 5-year parts and 5-year compressor warranty from the date of installation. This warranty does not cover labor, shipping, or handling costs. The installing contractor is responsible for labor warranty. Warranty registration is available online.
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