MRCOOL VERSA PRO MVP-18-HP-MUAH-230-25 (01) PDF Document

This manual covers the following MRCOOL Versa Pro Central Ducted 18K-30K models:

CONDENSER:

MVP-18-HP-C-230-25

MVP-24-HP-C-230-25

MVP-30-HP-C-230-25

AIR HANDLER:

MVP-18-HP-MUAH-230-25

MVP-24-HP-MUAH-230-25

MVP-30-HP-MUAH-230-25

COMPLETE SYSTEM:

MVP-18-HP-230-25

MVP-24-HP-230-25

MVP-30-HP-230-25

The 18K/24K/30K capacity units, including the MRCOOL VERSA PRO MVP-18-HP-MUAH-230-25, are designed to use the MRCOOL® Quick Connect® Pre-Charged Line Set as the preferred type of refrigerant piping. If this method is used, you DO NOT have to retain the services of a professional HVAC installer for this step.

However, these units can also be installed using a traditional flare nut configuration of refrigerant piping. If this method is selected, you ARE REQUIRED to retain the services of a professional HVAC installer. Additional components to complete this form of installation will have to be purchased separately. This form of installation also WILL REQUIRE the refrigerant piping to be properly insulated, otherwise sweating will occur and could cause property damage. If any other form of installation is attempted, or these stipulations are not followed, the WARRANTY WILL BE VOIDED.

DISCLAIMER: You are assuming risk by handling materials containing refrigerants under pressure, that if not handled properly, can cause bodily injury. If you do not feel comfortable conducting this installation process, we recommend you retain the services of a qualified HVAC professional. Electrical work must be completed by a qualified electrical technician.

Please adhere to the following warnings during the installation of your MRCOOL VERSA PRO MVP-18-HP-MUAH-230-25:

INSTALLATION MUST BE PERFORMED BY AN AUTHORIZED DEALER OR SPECIALIST. Defective installation can cause water leakage, electrical shock, or fire.

ELECTRICAL WORK MUST BE COMPLETED BY A QUALIFIED ELECTRICAL TECHNICIAN.

DO NOT install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it could cause fire.

DO NOT turn on the power until the installation and all work has been completed.

DO NOT install a unit equipped with an auxiliary electric heater within 3 ft (1 m) of any combustible materials.

1. Installation must be performed according to the installation instructions. Improper installation could cause water leakage, electrical shock, fire, and could void the warranty. In North America, all wiring/electrical work must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.

2. Contact an authorized service technician for repair or maintenance of this unit. This appliance must be installed in accordance with national wiring regulations.

3. Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, and/or failure of the unit.

4. Install the unit in a firm location that can support the unit’s weight. If the location cannot support the unit’s weight, or the installation is not done properly, the unit may drop and cause serious injury and damage.

5. Install the drainage piping according to the instructions in this manual. Improper drainage could cause water damage to your home and/or property.

6. When moving or relocating the air conditioner, consult experienced service technicians for disconnection and re-installation of the unit.

7. For detailed information on how to install the indoor and outdoor units to their respective supports, please refer to the indoor unit installation and outdoor unit installation sections of this manual.

8. Excessive Weight Hazard: Use two or more people when moving and installing the unit. Failure to do this could result in personal injury.

To ensure safe operation of your MRCOOL VERSA PRO MVP-18-HP-MUAH-230-25, follow these warnings:

DO NOT insert fingers, rods, or other objects into the air inlet or outlet. This could cause injury, since the fan may be rotating at high speeds.

DO NOT use flammable sprays such as hair spray, lacquer or paint near the unit, as this could cause fire and/or an explosion.

DO NOT operate the unit in places near or around combustible gases. Emitted gas may collect around the unit and cause an explosion.

DO NOT allow children to play with the appliance. Children must be supervised around the unit at all times.

DO NOT operate the unit in a room where it could be exposed to excessive amounts of water, such as a bathroom or laundry room. Exposure to excessive water amounts can cause the electrical components to short circuit.

DO NOT expose your body directly to direct cool airflow from the unit for a prolonged period of time.

1. If the unit operates abnormally (emits strange noises or a burning smell), immediately turn off the unit and disconnect the power in order to avoid electric shock, fire, and/or injury.

2. If the air conditioner is used together with burners or other heating devices, thoroughly ventilate the room in order to avoid an oxygen deficiency.

3. In certain functional environments (such as kitchens and server rooms etc.), the use of specially designed air-conditioning units is highly recommended.

4. This appliance can be used by children (8 years and older) and persons with reduced physical, sensory or mental capabilities, or lack of experience and knowledge if they have been given instruction concerning the use of the appliance and understand the hazards involved.

5. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer, service agency, or the gas supplier.

ELECTRICAL WORK MUST BE COMPLETED BY A QUALIFIED ELECTRICAL TECHNICIAN.

DO NOT share the power supply with other appliances. An improper or insufficient power supply could cause fire and/or electrical shock.

1. The product must be properly grounded during installation or electrical shock could occur.

2. Appropriate wiring standards, regulations, and the installation manual must be followed for all electrical work.

3. If connecting power to fixed wiring, an all-pole disconnection device must be incorporated in the fixed wiring in accordance with the wiring rules and must meet the following requirements: at least 3 mm of clearances in all poles, a leakage current that may exceed 10 mA, and a residual current device (RCD) having a rated residual operating current not exceeding 30 mA.

4. For all electrical work, use the specified cables. Connect cables tightly and clamp them securely to prevent external forces from damaging the terminal. Improper electrical connections could overheat, causing fire and/or electrical shock.

5. All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units.

6. All wiring must be properly arranged to ensure that the control board cover can close properly. If the control board cover is not properly closed, it can lead to corrosion and cause the connection points on the terminal to heat up, catch fire, or cause electrical shock.

Follow these warnings for cleaning and maintenance:

DO NOT clean the unit with excessive amounts of water.

DO NOT clean unit with combustible cleaning agents, as these could cause deformation and/or fire.

1. Turn off the device and disconnect the power before cleaning. Failure to do this could result in electrical shock.

The unit’s circuit board (PCB) is designed with a fuse to provide over-current protection. This fuse must be replaced with an identical component if the existing fuse is blown.

The specifications of the fuse are printed on the circuit board, examples of such are T5A/250VAC and T10A/250VAC.

Please observe the following cautions when operating your system:

DO NOT allow the air conditioner to operate for extended periods of time with the doors or windows open, or in very high humidity.

DO NOT operate the air conditioner with wet hands, as this could cause electric shock.

DO NOT use the device for any other purpose than its intended use.

DO NOT climb onto or place objects on top of the outdoor unit.

1. Make sure that water condensation can drain smoothly and unhindered from the unit.

2. Turn off the unit and disconnect the power if the unit will not be used for an extended period of time.

3. As with any mechanical equipment, contact with sharp metal edges can result in personal injury. Ensure care is taken when handling the unit and any of its accessories by wearing gloves and protective clothing.

The allowed static pressure range of the air conditioner on site is 0.00-0.80 in H2O (0-200 Pa). The data below represents the static pressures at the full required airflow used for AHRI testing.

Units: Inch of Water Column (Pascals)

NOTE: The maximum functional total external static pressure cannot exceed 0.80 in WC (200 Pa). The airflow reduces significantly with pressures above and beyond 0.80 in WC (200 Pa). The system design should allow for the increased resistance of filters as they become dirty.

The following accessories and parts are included. Note that these may vary depending on purchase and options. Use all installation parts and accessories to install the system properly.

Standard Accessories:

NOTE: The wired system control functions as an IR receiver for the handheld remote. If the remote is not used, it must be retained with the indoor unit to adjust parameters, and for troubleshooting.

Included Optional Accessories:

CAUTION:

Install the indoor and outdoor units, cables, and wires at least 3.2 ft (1 m) away from televisions or radios to prevent static or image distortion. Depending on the appliances, a 3.2ft (1m) distance may not be sufficient.

The indoor unit must be electrically grounded per national and local electrical codes.

WARNING:

DO NOT install the indoor unit in any of the following locations:

Areas where oil drilling or fracking is being performed.

Coastal areas with high salt content in the air.

Areas with caustic gases in the air, such as near laundry vents.

Areas with strong electromagnetic waves.

Areas where flammable materials or gas are stored.

Rooms with high humidity, such as bathrooms or laundry rooms.

Areas where the air inlet and outlet may be obstructed.

WARNING:

Be sure to apply sealant around any places where wires, refrigerant piping, and condensate piping enter the air handler cabinet.

Use duct tape and/or Permagum to seal any space around the holes where condensate piping exits the cabinet. Warm air must not be allowed to enter through any gaps or holes in the cabinet.

Remove all accessories and packing from the air outlet before installation.

WARNING:

There must be an airtight seal between the bottom of the air handler and the return air plenum. In order to achieve this, use fiberglass sealing strips, foil duct tape, caulking, or an equivalent sealing method to ensure a tight seal.

Return air must not be drawn from a room where the air handler or any gas-fueled appliance (ex: water heater), or carbon monoxide-producing device (ex: wood fireplace) is installed.

The indoor unit should be installed in a location that meets the following requirements:

✓ Enough room for the installation and maintenance to be performed.

✓ Enough room for the refrigerant piping and drain pipe.

✓ On a structure that can support its weight. If the structure is too weak, the unit may fall and cause personal injury, unit and property damage, or death.

✓ At least 18 inches (46 cm) above the floor for a garage installation. Failure to follow these instructions can result in death, explosion, or fire.

✓ If suspended, the structure must support the weight of the unit.

✓ The ceiling is horizontal and its structure can sustain the weight of the indoor unit.

✓ The air inlet and outlet are not impeded.

✓ Room for properly sized return and supply ducts must be maintained.

✓ There is no direct radiation from heaters.

Unit Dimensions

Filter Dimensions

The filter must meet the requirements of UL900.

CAUTION: Air outlet grille should be installed at the air outlet with the dimension between grille sheets less than 1 inch (25.4mm). The air outlet grille cannot be removed without tools.

Air supply and return can be handled in one of several ways depending on which is best suited for the type of installation. The vast majority of problems encountered with combination cooling systems can be linked to improperly designed or installed ductwork. For this reason, it is highly important that the duct system be properly designed and installed.

The use of flexible duct collars will minimize the transmission of vibration and noise into the conditioned space. In an installation where the return air duct is short, or where sound is likely to be a problem, a sound absorbing liner should be used inside the duct.

Insulation of the ductwork is a requirement anywhere it runs through an uncooled space during the cooling season.

The use of a vapor barrier is recommended to prevent absorption of moisture from the surrounding air into the insulation.

The supply air duct should utilize a properly sized transition in order to match the unit opening.

All ducts should be suspended using flexible hangers and never fastened directly to the structure. This unit is not designed for non-ducted (free-blow) applications.

Ductwork should be fabricated and installed in accordance with local and/or national codes.

CAUTION:

A field-fabricated secondary drain pan (not included), with a drain pipe to the outside of the building is required in all installations over a finished living space or in any area that may be damaged by overflow from the main drain pan. NOTE: A secondary drain pan is required for horizontal installations.

This unit is not designed for non-ducted (free-blow) applications. Electric heat kit elements and/or blower is easily accessible without ductwork and creates a safety hazard that could result in electric shock and/or personal injury.

To change the unit from its default Vertical Upflow configuration to Horizontal Right or Downflow, follow these steps. Note that Vertical Up and Horizontal Left installation does not require changing the evaporator direction.

Step 1: Remove the filter door, then remove the filter.

Step 2: Remove the upper cover assembly.

Step 3: Remove the evaporator cover plate. Remove the bottom cover first, then the second cover plate.

Step 4: Identify the position of the evaporator’s temperature sensors (T1, T2, T2A, T2B).

Step 5: Unplug temperature sensors T1 and T2 from the control board. T1 is the Room Temperature Sensor, T2 is the Evaporator Central Sensor Plug, T2A is the Evaporator Input Sensor Plug, and T2B is the Evaporator Output Sensor Plug.

Step 6: Remove T1 and T2 Sensor wire ties.

Step 7: Take out the evaporator and drain pan assembly and rotate it 180° (this rotation is needed for a vertical down configuration).

Step 8: Adjust the mounting parts positioning according to the new direction of the unit.

Step 9: Reinstall the evaporator and drain pan.

Step 10: Reinstall T1, T2, T2A, and T2B sensor plugs and the electronic expansion valve (EEV) plug. Tie up the sensor wires. Ensure the evaporator is now correctly assembled in place. The wire body needs to pass through the wire groove from the drain pan and attach to the hook on the drain pan.

Step 11: Use cable ties to attach the room temperature sensor as shown in the manual’s figure.

Step 12: Reinstall the evaporator cover plate.

Step 13: Connect the wiring according to the wiring diagram.

Step 14: Reassemble the upper cover and reinstall the filter and filter cover plate.

Step 15: Connect the pipes and install drainage pipes.

The unit operates with a negative pressure at the drain connections, so a drain trap is required. The trap must be installed as close to the unit as possible. Make sure the top of the trap is below the connection to the drain pan to allow complete drainage of the pan.

WARNING:

After removing the drain pan plug(s), check the drain hole(s) to verify that the drain opening is fully clear and free of any debris. Also check to ensure no debris has fallen into the drain pan during installation that could plug the drain opening. Apply sealant around the exiting drain pipe and the liquid and suction lines to prevent the infiltration of humid air.

On units of this type in which the blower “draws” in air rather than “blows” air through the coil, traps must be installed in the condensate drain lines (primary and auxiliary, if used). Traps prevent the blower from drawing air through the drain lines into the air supply.

NOTICE:

Horizontal runs must also have an anti-siphon air vent (standpipe) installed ahead of the horizontal run to eliminate air trapping. Incorrect installation could cause water to flow back into the unit and flood.

CAUTION:

The drainpipe outlet should be at least 1.9 in (5 cm) above the ground. If it touches the ground, the unit may become blocked and malfunction.

All field piping must be completed by a licensed technician and must comply with all local and national regulations.

Maximum length and drop height:

CAUTION – OIL TRAPS:

If oil flows back into the outdoor unit’s compressor, this may cause liquid compression or deterioration of the oil return. Oil traps in the rising gas pipe can prevent this.

For units less than 36,000Btu/h, an oil trap should be installed every 6m (19.7ft) of vertical suction line riser.

For units greater than 36,000Btu/h, an oil trap should be installed every 10m(32.8ft) of vertical suction line riser.

Follow these instructions for connecting the refrigerant lines. Failure to do so may void the warranty.

Step 1: When immediately ready to install the refrigerant line, remove the plastic seals/caps from the indoor unit and refrigerant line. Align the Quick Connector with the valve of the indoor unit, ensuring that they are the same size.

Step 2: Screw the Quick Connecting line onto the quick connector and hand tighten. Be careful not to cross-thread. Using two open-ended wrenches, tighten the quick-connect nut (2) on the line according to the torque specification in the table below, being careful not to loosen the connection (1) to the valve body.

Step 3: After completing steps 1-2, check that all connections are sealed correctly using a leak detection spray or soap suds. If any bubbles form, the system has a leak and the screw connectors must be retightened using an open-ended wrench.

Step 4: Remove the cover on the top valve using a 19mm open-ended wrench. Open the valve by turning it counter-clockwise as far as it will go using a 5mm Allen wrench. The valve is now open. If the valve is not fully opened, the system may malfunction and suffer damage. Screw the cover back onto the top valve and tighten it well to ensure that it is properly sealed.

Step 5: After the unit is installed, wrap the valve body with insulation material and ensure the valve is sealed.

Torque Table

NOTICE: Since the coupling works with tapping rings, it may leak if pipes are disconnected and reconnected. This will also void the warranty.

Installation must be performed by a licensed contractor. Before installation, confirm the electric auxiliary heat module and supplied accessories are present and free of damage.

Model Size Selection:

The optional Electric Auxiliary Heat Module is available in sizes from 5kW to 25kW. Refer to the table below for selection of available sizes for your model, being sure to avoid improper matching. Only use compatible modules certified for use with the model.

Installation and Wiring Operation:

Step 1: Open the upper cover of the indoor unit.

Step 2: Use tools to remove the knock-out holes of the upper cover.

Step 3: Remove the terminal block and power wires, loosen the screws, and remove the electric auxiliary heating cover.

Step 4: Install the electric auxiliary heating assembly through the front, and note that the support assembly must lock into the support holes in the back of the cabinet.

Step 5: Tighten the mounting screws.

Step 6: Wire according to the wiring nameplate. Apply the wiring diagram to the inside cover for future reference and maintenance.

Step 7: Install the upper cover and the silicone breaker cover.

Step 8: After installing the electric auxiliary heat module, apply the circuit breaker label near the silicone breaker cover previously installed.

NOTICE: The specification may be different between different models. Refer to the indoor unit’s nameplate. Choose the cable type according to the local electrical codes and regulations. Choose the correct cable size according to the Minimum Circuit Ampacity indicated on the nameplate of the unit. Use copper wire only to connect unit.

Before installing the outdoor unit, choose an appropriate location based on these standards:

Meets all spatial requirements: At least 12in (30cm) on the left, 24in (60cm) above, 24in (60cm) on the right, 12in (30cm) from the back wall, and 79in (200cm) in front.

Firm & Solid: The location must support the unit and not vibrate.

Quiet: Noise from the unit will not disturb other people.

Good air circulation and ventilation.

Raised: The outdoor unit must be installed on a riser of at least 6in (15cm) in height or per local code to get the unit above the local mean snow fall.

Snowfall protection: Where snowfall is anticipated, take appropriate measures to prevent ice buildup and coil damage.

Do NOT install the unit in the following locations:

Near an obstacle that will block air inlets and outlets.

In a location that is exposed to large amounts of dust.

Near animals or plants that will be harmed by hot air discharge.

Near any source of combustible gas.

Near a public street, crowded areas, or where noise from the unit can disturb others.

Step 1: Find the base pan hole on the outdoor unit.

Step 2:

Fit the rubber seal on the end of the drain fitting that will connect to the outdoor unit.

Insert the drain fitting into the hole in the base pan of the unit. The drain fitting will click into place.

Connect a drain hose extension (not included) to the drain fitting to redirect water from the unit during heating mode.

IN COLD CLIMATES: In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze inside the hose and flood the unit.

The outdoor unit can be anchored to the ground or to a wall-mounted bracket with an M10 bolt. Prepare the installation base according to the dimensions below.

Outdoor Unit & Mounting Dimensions:

If installing the unit on the ground or concrete mounting platform:

Mark the positions for four expansion bolts based on the dimensions chart.

Pre-Drill holes for expansion bolts.

Place a nut on the end of each expansion bolt.

Hammer expansion bolts into the pre-drilled holes.

Remove the nuts from expansion bolts, and place the outdoor unit on bolts.

Put a washer on each expansion bolt, then replace the nuts.

Using a wrench, tighten each nut until snug.

If installing the unit on a wall-mounted bracket:

Mark the position of the bracket holes based on the dimensions chart.

Pre-Drill holes for expansion bolts.

Place a washer and nut on the end of each expansion bolt.

Thread expansion bolts through the holes in the mounting brackets, put mounting brackets into position, and hammer the expansion bolts into the wall.

Check that the mounting brackets are level.

Carefully lift the unit and place its mounting feet on brackets.

Bolt the unit firmly to the brackets.

If allowed, install the unit with rubber isolator pads to reduce vibrations and noise.

Step 1: Remove the service valve cover on the outdoor unit.

Step 2: When immediately ready to install the refrigerant line, remove the plastic seals/caps from the outdoor unit and refrigerant line.

Step 3: Align the refrigerant quick-connect line with the threaded connector on the outdoor unit, ensuring they are the same size. Being careful not to cross-thread, screw the line connector onto the quick-connect and hand-tighten.

Step 4: Using two open-ended wrenches, tighten the quick-connect nut on the line according to the torque specification in the table below, being careful not to loosen the connection to the valve body.

Step 5: After completing steps 1-4, check that all the connections are sealed correctly using leak detection spray or soap suds. If any bubbles form, the system has a leak and the screw connectors must be retightened using an open-ended wrench.

Step 6: Remove the cover on the top valve using a 19mm open-ended wrench. Open the valve by turning it counter-clockwise as far as it will go using a 5mm Allen key. Screw the cover back onto the top valve and tighten it well.

Step 7: Remove the cover on the bottom valve using a 19mm open-ended wrench. Open the valve by turning it counter-clockwise as far as it will go using a 5mm Allen key. Screw the cover back onto the bottom valve and tighten it well.

Step 8: After completing steps 1-7, check for leaks again with leak detection spray or soap suds. If bubbles form, retighten the connectors.

Step 9: With the system now functional, check the system again for leaks while operating in both cooling and heating modes to allow proper operating pressures to be generated. If leaks persist, retighten connectors until no leak exists.

Before performing any electrical work, read these warnings:

BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SYSTEM.

All wiring must comply with local and national electrical codes, regulations, and must be installed by a licensed electrician.

All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units.

If there is a serious safety issue with the power supply, stop work immediately. Do not resume the install until the safety issue is properly resolved.

Power voltage should be within 90-110% of rated voltage. Insufficient power supply can cause malfunction, electrical shock, or fire.

Installation of an external surge suppressor at the outdoor disconnect is recommended.

If connecting power to fixed wiring, a switch or circuit breaker that disconnects all poles and has a contact separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. The qualified technician must use an approved circuit breaker or switch.

Only connect the unit to an individual branch circuit. Do not connect another appliance to that circuit.

Make sure to properly ground the unit.

Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in product malfunction and possible fire.

Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the unit.

To avoid getting electric shock, never touch the electrical components soon after the power supply has been turned off. After turning off the power, always wait 10 minutes or more before you touch the electrical components.

Ensure electrical wiring does not cross with signal wiring. This may cause distortion, interference, or possibly damage the circuit boards.

No other equipment should be connected to the same power circuit.

Connect the outdoor wires before connecting the indoor wires.

BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SYSTEM.

Prepare the cable for connection:

1. Choose the right cable size according to local electrical codes and the Minimum Circuit Ampacity on the unit nameplate.

2. Using wire strippers, strip the jacket from both ends of the signal cable to reveal approximately 5.9in (15cm) of wire.

3. Strip the insulation from the ends.

4. Using a wire crimper, crimp u-lugs on the ends.

Unit Wiring:

Step 1: Unscrew the electrical wiring cover and remove it. Connect the sheathed wire through the wire port.

Step 2: Remove the electrical box cover of the outdoor unit.

Step 3:

1. Match the wire colors/labels with the labels on the terminal block. Firmly screw the u-lug of each wire to its corresponding terminal.

2. Clamp down the cable with the cable clamp.

3. Insulate unused wires with electrical tape. Keep them away from any electrical or metal parts.

4. Reinstall the cover of the electrical control box and the side wire cover.

WARNING: ISOLATE THE POWER SUPPLY LEADS AND COMMUNICATION LEADS BY THE STRAIN RELIEF AND KEEP POWER SUPPLY LEADS AWAY FROM COMMUNICATION LEADS.

Indoor Unit Wiring Procedure:

Step 1: Prepare the cable for connection.

1. Using wire strippers, strip the rubber jacket from both ends of the signal cable to reveal about 5.9in (15cm) of the wire.

2. Strip the insulation from the ends of the wires.

Step 2: Open the front panel.

1. Open the front panel of the indoor unit. Using a screwdriver, remove the cover of the electric control box on your indoor unit.

2. Thread the power cable and the signal cable through the wire outlet.

Step 3: Connect the wires to the terminals.

Match the wire colors/labels with the labels on the terminal block. Firmly screw the wires of each wire to its corresponding terminal. Refer to the Serial Number and Wiring Diagram located on the cover of the electric control box.

Step 4: Reattach the electric box cover.

Clamp down the cable with the cable clamp. The cable must not be loose or pull on the u-lugs. Reattach the electric box cover.

CAUTION:

While connecting the wires, strictly follow the wiring diagram.

The refrigerant circuit can become very hot. Keep the interconnection cable away from the copper tube.

Condensate Overflow Switch:

The unit will accommodate a remote condensate overflow switch. To enable, remove jumper J1 and connect the installer-provided condensate overflow device to CN5. When an overflow condition is present, the device should open connection signaling the unit to turn off the system.

Fault Warning / Alarm Output:

An alarm output (CN33) can be utilized if actions are required when a fault is present. This is a passive outlet port, so you will need to input a voltage signal. The relay is normally open for normal operation, and closed when a fault condition is active.

Humidifier Control:

To connect a humidifier, utilize the passive signal “WORK” output (CN23) port as well as the G and C wires on the controller. Wire the humidistat and humidifier per the wiring diagram in the manual. When the fan is running, the CN23 relay will be closed, allowing power to the humidifier when the humidistat is below the humidity setpoint. If the thermostat or zone controller has a HUM interface, connect the humidifier directly to the HUM and C ports.

Dehumidification Control Wiring:

Dehumidification control requires an external Humidistat at DH and R. Set DIP switch S4-2 to OFF. When the humidity rises and exceeds the set value of the Humidistat, the 24V signal of DH changes to 0V, the cooling system starts the dehumidification operation, and the air volume drops to 80% of the nominal cooling air volume.

UV, Fresh Air, or Ion Generator Wiring:

The WORK port (CN23) is linked with the fan. When the fan is running, the relay is closed. If an active 24V signal is required, it can be directly connected to the G and C ports.

LED Display:

The control displays unit status as well as any active fault codes on the LED display. If the unit is functioning normally, the LED will display the current temperature setpoint. When a fault code is active, the display will quickly flash the active fault code. Refer to the fault code table located in the troubleshooting section of the manual for detailed fault code information.

KEY1 Instructions (For Wired Controller Only):

Press KEY1 to enter the forced automatic mode.

Press KEY1 again to enter the forced cooling mode (LED Display FC).

Press KEY1 again to shut down.

Keep pressing KEY1 under forced cooling mode (LED Display FC) for five seconds to enter forced defrost mode.

The constant airflow volume motor is applied. Therefore, the airflow volume is constant at all External Static Pressure (ESP) within the stated range of 0 – 0.80 in. w.g.

Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage the unit. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit. Evacuation should be performed upon initial installation and when the unit is relocated.

Before Performing Evacuation:

✓ Check to ensure the connective pipes between the indoor and outdoor units are connected properly.

✓ Check to make sure all wiring is connected properly.

Evacuation Instructions:

1. Connect the charge hose of the manifold gauge to the service port on the outdoor unit’s low pressure valve.

2. Connect another charge hose from the manifold gauge to the vacuum pump.

3. Open the low pressure side of the manifold gauge. Keep the high pressure side closed.

4. Turn on the vacuum pump to evacuate the system.

5. Run the vacuum for at least 15 minutes, or until the compound meter reads -750 Microns (-105Pa).

6. Close the low pressure side of the manifold gauge, and turn off the vacuum pump.

7. Wait for 5 minutes, then check that there has been no change in system pressure.

8. If there is a change in system pressure, check for leaks. If there is no change, unscrew the cap from the packed valve (high pressure valve).

9. Insert a hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the wrench in a 1/4 counter-clockwise turn. Listen for gas to exit the system, then close the valve after 5 seconds.

10. Watch the pressure gauge for one minute to make sure that there is no change in pressure. The pressure gauge should read slightly higher than atmospheric pressure.

11. Remove the charge hose from the service port.

12. Using a hexagonal wrench, fully open both the high pressure and low pressure valves.

13. Tighten valve caps on all three valves (service port, high pressure, and low pressure) by hand. Tighten it further using a torque wrench if needed.

CAUTION: DO NOT mix refrigerant types.

Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local regulations. For example, in North America, the standard pipe length is 7.5m (25′). The refrigerant should be charged from the service port on the outdoor unit’s low pressure valve. The additional refrigerant to be charged can be calculated using the following formula:

A test run must be performed after the entire system has been completely installed. Failure to perform the test run may result in unit damage, property damage, or personal injury.

Before Test Run Checklist:

a) Indoor and outdoor units are properly installed.

b) Piping and wiring are properly connected.

c) No obstacles near the inlet and outlet of the unit that might cause poor performance or product malfunction.

d) Refrigeration system does not leak.

e) Drainage system is unimpeded and draining to a safe location.

f) Insulation of piping and duct is properly installed.

g) Grounding wires are properly connected.

h) Length of the piping and additional refrigerant capacity have been recorded.

i) Power voltage is the correct voltage for the system.

Test Run Instructions:

1. Open both the liquid and gas service valves.

2. Turn on the main power switch and allow the unit to warm up.

3. Set the unit to COOL mode.

4. For the Indoor Unit:

a. Double check to see if the room temperature is being registered correctly.

b. Ensure the manual buttons on the indoor unit work properly.

c. Check to see that the drainage system is unimpeded and draining smoothly.

d. Ensure there is no vibration or abnormal noise during operation.

5. For the Outdoor Unit:

a. Check for any leaks from the refrigeration system.

b. Make sure there is no vibration or abnormal noise during operation.

c. Ensure the wind, noise, and water generated by the unit do not disturb individuals nearby or pose a safety hazard.

6. Drainage Test:

a. Ensure the drainpipe flows smoothly. New buildings should perform this test before finishing the ceiling.

b. Turn on the main power switch and run the unit in COOL mode.

c. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe.

d. Make sure that there are no leaks in any of the piping.

e. Stop the unit. Turn off the main power switch and reinstall the test cover.

The following table details the 24V input terminal signals for different operating modes.

Note: 1 = 24V signal, 0 = No 24V signal, * = 1 or 0. The Air Handler Unit (AUU) will turn off if the 24V input cannot meet the table requirements.