Innovair PXV36H2A Inverter Heat Pump Package Unit Installer's Guide

Nomenclature

The following diagram explains the model number PXV36H2A:

For up-to-date information such as specifications, catalogs, and bulletins, please scan the QR code or visit innovair.com.

Product Overview

This document is an Installer's Guide for the Innovair Package Unit, specifically the Inverter Heat Pump Package Unit model PXV36H2A. It offers up to 18.5 SEER2, is designed for 2-3 Tons, and uses R32 refrigerant.

Safety Precautions

This section details critical safety information for the installation and servicing of the unit, particularly concerning the use of R32 refrigerant and electrical safety.

General Precautions for R32 Refrigerant:

• This air conditioner uses new refrigerant HFC (R32).
• HFC R32 is different from HFC R22 / R410A; special piping, installation, and service tools are required.
• Power supply: 208/230V ~, 60Hz.
• Ensure servicing equipment and replacement components are applicable for R32 refrigerant.
• Do not discharge R32 refrigerant into the air. Cylinder service pressure rating must be over 750 psig (5.17MPa). R32 systems should be charged with liquid refrigerant.
• Leak detectors should be designed to detect HFC refrigerant.
• R32 refrigerant is only compatible with POE oils. Do not expose to air, as it can damage certain plastics.
• Replace all filter driers after maintenance.

Hazard Definitions:

• DANGER: Symbol refers to a hazard resulting in severe personal injury or death.
• WARNING: Symbol refers to a hazard or unsafe practice resulting in severe personal injury or death.
• CAUTION: Symbol refers to a hazard or unsafe practice resulting in personal injury, product, or property damage.
• NOTE: Refers to remarks and instructions for operation, maintenance, and service.

Installation Safety:

• Installation must be performed by qualified personnel. Improper installation can cause water leakage, electrical shock, or fire.
• Install on a solid base capable of supporting the unit's weight.
• Use specified wire types for electrical connections and clamp terminals securely.
• Use a cable long enough for the entire distance. Do not connect multiple devices to the same AC power supply.
• After installation, check for refrigerant leaks. Refrigerant gas leakage near heaters or flames can generate harmful substances.
• Perform installation securely, referring to the installation manual.
• Use a dedicated electrical line. Insufficient capacity or incomplete electrical work may cause fire or electric shock.
• Attach electrical covers and service panels securely. Loose covers can lead to fire or electric shock from dust/water.
• Cut off the main power supply before installing electronic PCB or wiring to prevent electric shock.
• Ensure sufficient ventilation at the repair place.
• Discharge capacitors safely to avoid sparking.
• When brazing is required, follow specific procedures: remove refrigerant, evacuate circuit, purge with nitrogen, cut parts (not flame), purge braze point with nitrogen, leak test.
• Reassemble sealed enclosures accurately; replace worn seals.
• Check safety equipment before putting into service.

Outdoor Machine Installation Location:

• Comply with state provisions for installation wiring.
• Protect electrical components from people and small animals. Keep the area clean.
• When installing/relocating, ensure only specified refrigerant (R32) enters the circuit. Foreign substances can cause pressure rise or explosion.
• Perform grounding: Do not connect earth wire to gas pipe, water pipe, lightning rod, or telephone earth wire. Defective grounding can cause electric shock.
• Do not install where flammable gas leaks. Leaks can cause explosions.
• Fasten flare nuts with specified torque. Overtightening can cause leaks.
• Install an earth leakage breaker if the place is humid.
• Perform drainage/piping work securely. Improper work can cause water damage.

Safety Instructions:

• Do not let air enter or discharge refrigerant when moving the unit.
• Appliance not intended for use by persons with reduced physical/sensory/mental capabilities, or lack of experience, unless supervised.
• Supervise children to ensure they do not play with the appliance.
• If the supply cord is damaged, it must be replaced by the manufacturer or qualified personnel.
• Install in accordance with national wiring regulations.
• Servicing only as recommended by the manufacturer.
• Maintenance/repair requiring skilled personnel must be supervised by someone competent with flammable refrigerants.
• Means for disconnection (e.g., circuit breaker) must be incorporated in fixed wiring.
• Allow disconnection of the appliance from the supply after installation. Ensure disconnection with a locking system for service/maintenance.
• Detailed wiring diagrams and component information are provided in later sections.
• This appliance is for use by experts or trained users in shops, light industry, farms, or commercial use.
• Instructions on additional refrigerant charging are detailed below.

Transport of Equipment Containing Flammable Refrigerants:

• Additional transportation regulations may apply.

Marking of Equipment Using Signs:

• Signs for similar appliances are addressed by local regulations. Employers must ensure employees receive suitable instruction on safety signs.

Disposal of Equipment Using Flammable Refrigerants:

• Compliance with national regulations.

Storage of Equipment/Appliances:

• Follow manufacturer's instructions.

Storage of Packed (Unsold) Equipment:

• Package protection must prevent mechanical damage causing refrigerant leaks.
• Maximum number of pieces stored together determined by local regulations.

Information on Servicing:

• Checks to the Area: Safety checks to minimize ignition risk before working on systems with flammable refrigerants.
• Work Procedure: Controlled procedure to minimize risk of flammable gas/vapor.
• General Work Area: Instruct personnel, avoid confined spaces, section off workspace, make area safe.
• Checking for Presence of Refrigerant: Use appropriate refrigerant detector. Ensure detector is suitable for flammable refrigerants and non-sparking. Calibrate detector in a refrigerant-free area. Set detector to a percentage of LFL (max 25%).
• Presence of Fire Extinguisher: Have appropriate fire extinguishing equipment (dry powder or CO2) available for hot work.
• No Ignition Sources: Keep ignition sources (cigarettes, lighters, etc.) away from the site. Survey area for flammable hazards. Display "No Smoking" signs.
• Ventilated Area: Ensure area is open or adequately ventilated before breaking into the system or conducting hot work. Maintain ventilation during work.
• Checks to the Refrigeration Equipment: Use correct specification electrical components. Follow manufacturer's maintenance/service guidelines. Consult manufacturer if in doubt.

Repairs of Sealed Components:

• Sealed electrical components shall be replaced.

Repairs of Intrinsically Safe Components:

• Intrinsically safe components must be replaced.

Cabling:

• Check cabling for wear, corrosion, pressure, vibration, sharp edges, or environmental effects. Consider aging and vibration from compressors/fans.

Detection of Flammable Refrigerants:

• Do not use potential ignition sources for leak detection.
• A halide torch (or any other detector using a naked flame) shall not be used.

Leak Detection Methods:

• Electronic leak detectors are acceptable. Ensure sensitivity and calibration.
• Ensure detector is not a source of ignition and is suitable for the refrigerant.
• Leak detection fluids: Avoid those containing chlorine, as chlorine may react with refrigerant and corrode copper.
• If a leak is suspected, extinguish all naked flames.
• If brazing is required for a leak, recover all refrigerant or isolate the leak area.
• Refrigerant removal according to the manual.

Removal and Evacuation:

• Follow conventional procedures, but emphasize best practices for flammable refrigerants.
• Procedure: Safely remove refrigerant, evacuate, purge with inert gas (optional for A2L), flush/purge with inert gas when using flame, open circuit.
• Recover refrigerant into correct cylinders.
• Flush system with OFN to render it safe. Repeat as necessary.
• Compressed air or oxygen shall not be used.
• Flushing process involves vacuum and OFN filling/venting.
• This is vital if brazing operations are to take place.
• Ensure vacuum pump outlet is not near ignition sources and ventilation is available.

Charging Procedures:

• Follow conventional procedures plus:
• Ensure no contamination of different refrigerants.
• Use short hoses to minimize refrigerant volume.
• Keep cylinders upright.
• Earth the refrigeration system before charging.
• Label the system when charging is complete.
• Take extreme care not to overfill.
• Pressure test with OFN before recharging.
• Leak test on completion and before commissioning.
• Follow-up leak test before leaving the site.

Decommissioning:

• Technician must be familiar with equipment.
• Recover refrigerants safely.
• Take oil and refrigerant samples if analysis is required.
• Ensure electrical power is available.
• Familiarize with equipment operation.
• Isolate system electrically.
• Ensure mechanical handling equipment, PPE, and recovery equipment are available and used correctly. Recovery process must be supervised.
• Pump down refrigerant system if possible.
• If vacuum is not possible, use a manifold to remove refrigerant from various parts.
• Ensure cylinder is on scales before recovery.
• Start recovery machine per instructions.
• Do not overfill cylinders (max 80% liquid charge).
• Do not exceed cylinder maximum working pressure.
• Remove cylinders and equipment promptly; close isolation valves.
• Recovered refrigerant shall not be charged into another system unless cleaned and checked.

Labelling:

• Equipment shall be labelled stating it has been de-commissioned and is empty of refrigerant. Label dated and signed.
• For appliances with flammable refrigerants, ensure labels state this.

Recovery:

• Recommended to remove all refrigerant safely for servicing or decommissioning.
• Use appropriate recovery cylinders.
• Ensure correct number of cylinders.
• Cylinders must be designated and labelled for the refrigerant.
• Cylinders must have pressure relief valve and shut-off valves.
• Empty recovery cylinders evacuated and cooled if possible.
• Recovery equipment must be in good working order with instructions. Suitable for flammable refrigerants.
• Calibrated weighing scales must be available.
• Hoses must be leak-free and in good condition.
• Check recovery machine is in satisfactory working order, maintained, and electrical components sealed.
• Consult manufacturer if in doubt.
• Return recovered refrigerant to supplier in correct cylinder. Arrange Waste Transfer Note.
• Do not mix refrigerants in units or cylinders.
• If compressors/oils are removed, ensure they are evacuated to an acceptable level.
• Evacuate compressor before returning to suppliers.
• Only electric heating to compressor body for acceleration.
• Drain oil safely.

Competence of Service Personnel:

• Training should include: explosion potential of flammable refrigerants, potential ignition sources (lighters, switches, vacuum cleaners, heaters), concept of sealed components (UL 60335), correct working procedures (commissioning, maintenance, repair).
• Commissioning: Ensure sufficient floor area, connect pipes, leak test, check safety equipment.
• Maintenance: Repair portable equipment in a workshop. Ensure sufficient ventilation. Be aware of refrigerant loss/leaks. Discharge capacitors safely. Reassemble enclosures accurately.
• Repair: Portable equipment repair outside or in a specialized workshop.

Specific Warnings:

• Ensure sufficient ventilation at repair place.
• Be aware of potential refrigerant loss/leak.
• Discharge capacitors safely.
• Brazing procedures: remove refrigerant, evacuate, purge with nitrogen, cut parts, purge braze point, leak test.
• Decommissioning: remove refrigerant, ensure ventilation, discharge capacitors safely, remove refrigerant to outside, evacuate circuit, purge with nitrogen, cut compressor, drain oil.
• Disposal: ensure ventilation, remove refrigerant to outside, evacuate circuit, purge with nitrogen, cut compressor, drain oil.
• Pipe-work compliance with national gas regulations.
• Appliance installation/operation/storage in a room with floor area larger than Y (see below).
• When moving/relocating, consult experienced technicians.
• Do not place electrical products/belongings under indoor/outdoor unit to avoid damage from condensation.
• Do not use means to accelerate defrosting or cleaning other than manufacturer's recommendations.
• Store appliance in a room without continuously operating ignition sources.
• Do not pierce or burn.
• Refrigerants may not contain an odor.
• Keep ventilation openings clear.
• Store in a well-ventilated area meeting room size requirements.
• Store in a room without continuously operating ignition sources.
• Personnel handling refrigerant circuits must hold a valid certificate.
• Service only as recommended by manufacturer.
• Maintenance/repair requiring skilled personnel must be supervised.
• Install/store appliance to prevent mechanical damage.
• Mechanical connectors used indoors must comply with ISO 14903. Renew sealing parts when reusing. Re-fabricate flare parts when reusing.

Pipe-work Installation:

• Minimize pipe-work.
• Mechanical connections must be accessible.
• Pipe-work must be protected from physical damage and comply with codes (ASHRAE, IAPMO, ICC, CSA).
• Field joints must be accessible for inspection.
• After field piping, pressure test with inert gas and vacuum test.
• Minimum test pressure: low side 240 psig (1.65MPa), high side 600 psig (4.14MPa).
• Field-made refrigerant joints indoors must be tightness tested (sensitivity 5 grams/year). No leak detected. Joints must be welded or brazed.

Refrigerant Detection System:

• Appliances are equipped with a REFRIGERANT DETECTION SYSTEM.
• Indoor unit must be powered except for service.
• Controller connected to symbol wire displays caution info if leakage detected.
• If leakage detected, fan works, compressor stops. Contact qualified personnel for repair.
• System includes self-testing for sensor malfunction. If occurs, fan works, compressor stops. Controller displays caution. Contact qualified personnel.
• REFRIGERANT DETECTION SYSTEM shall only be replaced by the appliance manufacturer.

Note on Room Size:

• Indoor unit shall be installed in a room whose area Y is bigger than specified, or naturally ventilated to outdoors, or without continuously operating ignition sources.
• A flame-producing device may be installed if it has an effective flame arrest.
• If duct system meets requirements, room area Y can be calculated by all rooms.
• Appliances connected via air duct system to one or more rooms.
• If no refrigerant detection system, spaces with airflow limited by zoning dampers are not included in Y determination.
• If duct system doesn't meet requirements, any one room must meet minimum area Y. Duct outlets shall be 7.2ft (2.2m) high.

Explanation of Symbols:

• WARNING This symbol shows that this appliance uses a flammable refrigerant. If leaked and exposed to an external ignition source, there is a risk of fire.
• CAUTION This symbol shows that the operation manual should be read carefully.
• CAUTION This symbol shows that a service personnel should be handling this equipment with reference to the installation manual.
• CAUTION This symbol shows that information is available such as the operating manual or installation manual.

Component Location

The following diagram illustrates the location of key components within the unit:

Components: Outdoor Fan, Ambient Temperature Sensor, Reversing Valve, Compressor, Coil Guard Panel, Outdoor Coil, Fan Motor, Indoor Control Board, Transformer, Indoor Blower, Base Rails, Checker Board, Hoisting Hole, Outdoor Control Board.

NOTE: The figures are based on the external views of the standard model. Consequently, the shape may differ for the air conditioner model you have selected.

Dimensions

All dimensions are in inches (in.).

Unit Dimensions

Overall Unit:

• Length: 51"
• Height: 31-3/8"
• Width: 43-1/4"

Entrances/Ports:

• Low voltage entrance: 7/8" Dia
• High voltage entrance: 1-3/8" Dia
• Hi./Lo. pressure service port
• Electrical service access compartment panel
• Condensate drain connection: 3/4" NPTI (Trap required)

Side/Bottom Dimensions:

• Bottom view: Bottom return air opening, Bottom supply air opening.
• Back view: Side supply air opening, Side return air opening.

Top/Left View Dimensions:

• Top view indicates Supply and Return air directions.
• Left side view shows unit profile and base dimensions.

Installation Instructions

Safety Notice

WARNING: Read and follow local safety regulations (including ANSI/NFPS No. 70). Installation by qualified personnel is essential. Improper installation can cause water leakage, electrical shock, or fire.

• Use supplied or specified installation parts only.
• Ensure rooftop unit supports are strong enough for the unit's weight.
• Prevent blockage of air inlet/outlet.
• Perform sealing and insulation at duct connections.
• Electrical work must comply with manual and local codes. Insufficient capacity or incomplete work may cause shock or fire.
• Use a dedicated power circuit; do not share with other appliances.
• Use a cable long enough for the entire distance; do not use extension cords.
• Do not put other loads on the power supply.
• Use specified wire types and clamp terminals securely.
• Incomplete connections or clamping may cause terminal overheating or fire.
• Fix wires to prevent undue force on covers. Incomplete cover installation may cause overheating or shock.
• Keep refrigerant circuit free from air during installation/relocation. Air can cause pressure rise or rupture.
• Check for refrigerant leaks after installation. Refrigerant produces toxic gas if exposed to flames.
• When piping, prevent air substances other than specified refrigerant from entering the cycle. This can cause performance issues, high pressure, explosion, or injury.
• Ensure proper grounding. Do not ground to utility pipes, lightning arresters, or telephone grounding. Incomplete grounding may cause shock.
• An earth leakage circuit breaker may be required depending on site conditions.
• Disconnect power supply before wiring, piping, or checking the unit.

Transportation and Handling Before Installation

Transport the product close to the installation location before unpacking. Check hoisting equipment carefully. Ensure balance and safety during handling. Do not remove packaging until the unit reaches the installation site.

Handling Method:

1. Put sling through hoisting hole at the bottom of the roof.
2. Ensure clearance between sling connection point and unit above is at least 36 inches.
3. Keep unit weight evenly distributed on the sling for stable hoisting.

Installation Locations Selection

Obtain user's approval for site selection. Choose locations with:

• Good and clean airflow.
• No strong breeze.
• Distance from condenser air inlet/outlet to user's window above 25 inches to reduce fan noise impact.
• Rigid wall or support to prevent vibration.
• No risk of combustible gas leakage.
• At least 3m away from TV/radio antennas.
• Avoid places with running water or falling ice.
• Sufficient space for ventilation, wiring, and maintenance.

CAUTION: For areas with heavy snow or freezing temperatures, take special considerations:

1. Install unit 3-12 inches (76-304 mm) above ground/roof, with a location for defrost water discharge.
2. Mount unit at an inclined angle for evaporator drain to be at a low point (approx. 1 inch or 25 mm).
3. Do not install in areas prone to snow accumulation. If unavoidable, use an anti-snow barrier around the unit.

Rooftop Installation- Curb Mounting

The unit is installed with side return/outlet by default. For lower return/outlet, roof curbs (field supplied) must be used. Convert by placing the unit above the curb and fitting the lower air outlet to the curb's inlet/outlet. Ensure a sealed connection with thermal insulation foam.

Additional Steps for Conversion:

1. Put the unit on the ground, disassemble the air return and outlet sealing plate at the bottom, and install it on the side air outlet.
2. Paste thermal insulation foam around the conversion part and install the unit on the curb, ensuring the contact position is sealed.

Air Duct

Field duct work must comply with NFPA 90/90B and local ordinances.

WARNING: Do not connect return duct work to other heat-producing devices (fireplace, stove) as it may result in fire, CO poisoning, explosion, injury, or property damage.

• Sheet metal duct work in unconditioned spaces must be insulated and vapor-barrier covered.
• Fibrous duct work must comply with SMACNA standards and U/L Standard 181 for Class I Air Ducts.
• Check local codes for duct work and insulation requirements.
• Duct system must be designed for the unit's external static pressure range. Ensure adequate airflow. Account for total resistance from supply/return duct work, grills, filters, etc.

Sideflow Installation:

• For sideflow units with a flange, fix the air duct system and fasteners to the flange. Seal the connection between the air duct and the unit with thermal insulation foam to prevent air leakage.

Downflow Installation

For side air outlet installation, remove the return air panel and supply air panel on the side. For lower air outlet installation, remove side panels first, then bottom panels, and finally reinstall panels on the side.

Condensate Drain Connection

The evaporator drain is a 3/4" female thread, connecting to a 3/4" male thread drain pipe. Discharge condensate directly to the outside. Keep the unit drain at least 1 inch above the pipeline drain, and the pipeline drain at least 2 inches above the ground. Tilt the drain pipe towards the pipeline drain for smooth drainage. Perform sealing and insulation on the drain pipe surface as necessary.

Air Filter (Not Factory-Installed)

The unit does not include an air filter. Consider filter size, type, and pressure drop during duct system design. External filter flow rate should be 300-390 ft/min. Avoid air volume reduction with HEPA or electronic filters; consult a professional installer. Regularly check and clean the air filter. A dirty filter increases resistance, reduces airflow, lowers efficiency, and increases operating cost.

System Charge Adjustment

Factory Refrigerant Precharge:

Note:

1. If refrigerant needs to be charged, use the Weigh-In Method.
2. The maximum refrigerant charge amount is as shown in the table.

Electrical Wiring

WARNING: Turn OFF the main power switch for at least 3 minutes before electrical wiring or periodical checks. Ensure indoor/outdoor fans have stopped. Protect wires from animals. Avoid wires touching pipes/edges. Install an ELB (Electric Leakage Breaker). This unit uses an inverter; use an earth leak detector capable of handling harmonics. Do not use intermediate connection wires, stranded wires, or extension cables. Observe specified tightening torques for screws (M4 to M10).

CAUTION: Use tape to wrap wires, seal wiring holes to prevent water/insects. Secure power source wiring with the cord clamp. Use adhesive for rubber bushes if conduit tubes are not used.

General Check:

1. Ensure field-selected electrical components (switches, breakers, wires) comply with electrical data and NEC.
2. Check power supply voltage is within +/-10% of nominal and earth phase is present.
3. Ensure power supply capacity is sufficient.
4. Check that the earth wire is connected.
5. Install main switch with specified spacing between phases.
6. Measure electrical resistance between ground and terminals (>2 MΩ). Do not operate if leakage is found until repaired.

Electrical Wiring Diagram

This section provides wiring diagrams for various thermostat configurations (3H/2C, 4H/2C, 3H/1C, 2H/2C, 1H/1C, 2H/1C) and the Indoor unit main control board 24V interface definition.

Indoor Unit Main Control Board 24V Interface Definition:

Notes:

1. The "L" port displays fault information. Connect to the "L" port of the unit if the thermostat has a corresponding function.
2. If the machine does not have auxiliary electric heating, it only supports 2H2C and 1H1C working modes.

Electrical Data

Max. Running Current (A): REFER TO NAMEPLATE.

Notes:

1. Follow local codes and regulations for wire selection; above are minimum sizes.
2. For lengths < 100ft (30m), use 18AWG color-coded low voltage wire. For lengths > 100ft (30m), use 16AWG. For lengths > 262ft (80m), select larger wire size.
3. Install main switch and ELB separately for each system. Use high response type ELB (acts within 0.1 second).

Attentions when Connect the power supply wiring:

• When connecting stranded wire to the terminal block, use a round crimp-style terminal for connection. Ensure the terminal covers the wire up to the covered part.
• When connecting single core wire, perform curing.

DIP Switch Setting

This section details DIP switch settings for the indoor unit.

SW5 DIP Switch Setting: Q3 Wind Gear (Factory Setting: ON), Q1 Wind Gear (ON), Q2 Wind Gear (ON), Q4 Wind Gear (OFF), Q5 Wind Gear (ON), Air Volume Setting (Automatic: ON, Manual: OFF).

SW4 DIP Switch Setting: Factory Setting: ON, OFF, OFF, ON.

SW3 DIP Switch Setting: Capacity Select: 36K (ON, OFF, OFF), 24K (OFF, OFF, OFF).

DIP Switch Setting of Indoor Main Board:

1. "Mark" indicates DIP switch position.
2. SW3: capacity select.
3. SW4-4: For refrigerant leak recovery, flip the switch to unlock the machine.
4. SW5-1, SW5-2, SW5-3: Wind shift DIP switches.
5. SW5-4: Constant air volume control DIP switch.

The indoor unit has 5 wind levels. Table 1 shows DIP switch settings for each wind level.

Note:

1. SW5-4: Constant air volume ON/OFF control.
2. DIP switch ON: Manual constant air volume control (regulated by professionals per wire controller document).
3. DIP switch OFF: Automatic constant air volume control. Unit automatically matches static pressure of air ducts; refer to technical service manual for airflow performance.

Test Run

Perform test run after refrigerant piping, drain, and wiring are finished.

CAUTION: The heat pump air conditioner has a crankcase heater. Ensure the main power switch has been ON for more than 6 hours before preheating to avoid compressor damage.

Do not operate until all check points are cleared:

• Check that outdoor unit stop valves are fully opened.
• Check that electric wires are fully connected.
• Check electrical resistance is >2 MΩ. Do not operate if leakage is found until repaired.

Test Run Function Identification:

Operate thermostat to turn ON the appliance and proceed with test run. Monitor system operation. Do not touch parts on the discharge gas side, as they can be heated higher than 194°F (90°C).

Turn off power after test run. For any issues, contact the local technical service center.

Electric Heat Kit Selection Table

This table provides selection guidance for optional electric heat kits.

Key: •: available, x: unavailable

NOTE:

• Heat kit is an optional part and requires separate power supply connection.
• Recommended for low-temperature areas or long piping installations.
• Check heat kit suitability for Inverter Packaged Heat Pump unit 2-way position installation.
• Ampacities for MCA and Fuse/breaker do not include the heat pump.
• Heat pump systems require specified airflow: 350-450 CFM per ton of cooling.