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

The MRCOOL VERSA PRO MVP-18-HP-C-230-25 is 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, this unit 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, and 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 critical warnings during installation:

1. Installation must be performed by an authorized dealer or specialist. Defective installation can cause water leakage, electrical shock, or fire.

2. All electrical work must be completed by a qualified electrical technician.

3. 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.

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

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

6. Installation must be performed according to the installation instructions. Improper installation could cause water leakage, electrical shock, fire, and could void the warranty.

7. 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.

8. 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.

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

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

For safe operation of your MRCOOL VERSA PRO MVP-18-HP-C-230-25, please follow these warnings:

1. 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.

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

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

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

5. 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.

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

7. 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. Call your local dealer for further assistance.

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

9. 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.

All electrical work must be completed by a qualified electrical technician. Please observe the following warnings:

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

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

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

4. 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.

5. For all electrical work, fuse 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.

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

7. 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 guidelines for cleaning and maintenance:

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

2. DO NOT clean the unit with excessive amounts of water.

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

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

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

6. 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 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.

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

The following accessories and parts are included. Note that these may vary depending on purchase and options.

Included Optional Accessories:

Installation Safety Precautions:

1. 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.

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

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

4. 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.

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

6. There must be an airtight seal between the bottom of the air handler and the return air plenum. Use fiberglass sealing strips, foil duct tape, caulking, or an equivalent sealing method.

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

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

1. Areas where oil drilling or fracking is being performed.

2. Coastal areas with high salt content in the air.

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

4. Areas with strong electromagnetic waves.

5. Areas where flammable materials or gas are stored.

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

7. Areas where the air inlet and outlet may be obstructed.

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

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

2. Enough room for the refrigerant piping and drain pipe.

3. 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.

4. At least 18 inches (46 cm) above the floor for a garage installation.

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

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

7. The air inlet and outlet are not impeded.

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

9. There is no direct radiation from heaters.

Clearance Requirements:

1. Horizontal Installations Plenum Clearances: A minimum clearance of 1 in (25.4 mm) on all sides is required.

2. Vertical Installations: When installed vertically (upflow or downflow), the lower end of the air outlet needs to be connected to the L-shaped metal air duct and fastened by screws. A minimum of 24 inches is required for service access.

Indoor Unit Dimensions (18K-24K Model):

Filter Dimensions (18K-24K Model):

The filter must meet the requirements of UL900.

An 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.

Properly designed and installed ductwork is critical for system performance. Follow these guidelines:

1. The vast majority of problems encountered with combination cooling systems can be linked to improperly designed or installed ductwork.

2. The use of flexible duct collars will minimize the transmission of vibration and noise into the conditioned space.

3. 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.

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

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

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

7. 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.

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

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.

The unit can be installed in a Vertical (downflow or upflow) or a Horizontal (right or left) configuration.

Mounting Positions:

1. Vertical up: The unit stands upright with airflow moving upwards.

2. Horizontal: The unit lies on its side. Ensure at least 5 inches (12.7cm) of clearance underneath for drainage.

Note: Vertical Up and Horizontal Left installation does not require changing the direction of the evaporator.

Airflow Directions:

1. Upflow: Air enters from the bottom and exits through the top.

2. Downflow: Air enters from the top and exits through the bottom.

3. Horizontal left: Air enters from the right and exits through the left.

4. Horizontal right: Air enters from the left and exits through the right.

To change the configuration from the default Vertical Upflow/Horizontal Left to Horizontal Right or Downflow, you must reposition the internal evaporator coil and drain pan. Follow these steps:

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

2. Remove the upper cover assembly.

3. Remove the evaporator cover plate. You may need to remove a bottom cover first, then a second cover plate.

4. Identify the position of the evaporator’s temperature sensors (T1, T2, T2A, T2B) and the electronic expansion valve (EEV).

5. Unplug temperature sensors T1 and T2 from the control board. (T1: Room Temperature Sensor, T2: Evaporator Central Sensor Plug, T2A: Evaporator Input Sensor Plug, T2B: Evaporator Output Sensor Plug). Note: The 18K-24K model does not have T2A, T2B, or EEV.

6. Remove the wire ties for the T1 and T2 sensors.

7. Carefully take out the evaporator and drain pan assembly. Rotate it 180° for the new configuration.

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

9. Reinstall the evaporator and drain pan assembly into the cabinet.

10. Reinstall the T1 and T2 sensor plugs (and T2A, T2B, EEV if applicable) and tie up the sensor wires.

11. Use cable ties to attach the room temperature sensor (T1) as shown in the manual diagrams.

12. Reinstall the evaporator cover plate.

13. Connect the wiring according to the wiring diagram.

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

15. Connect the refrigerant 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.

Drain Trap Specifications:

1. The trap must include an anti-siphon air vent (Vent T).

2. The vertical distance from the drain connection to the bottom of the trap should be greater than 50mm (2″).

3. The height of the anti-siphon vent should be greater than 50mm (2″) above the top of the trap.

4. The drain line should have a slope (lean over) of at least 1/50.

Horizontal runs must also have an anti-siphon air vent (standpipe) installed ahead of the horizontal run to eliminate air trapping.

Important Cautions:

1. The drainpipe outlet should be at least 1.9 in (5 cm) above the ground.

2. If it touches the ground, the unit may become blocked and malfunction.

3. On units where the blower “draws” air through the coil, traps must be installed in the condensate drain lines to prevent the blower from drawing air through the drain lines into the air supply.

All field piping must be completed by a licensed technician and must comply with all local and national regulations. Ensure that air, dust, moisture, or foreign substances do not enter the refrigerant circuit.

Maximum Length and Drop Height:

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.

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

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

Follow these instructions for connecting the pre-charged refrigerant lines. Do not remove sealing caps until immediately before you install the lines.

1. When immediately ready to install the refrigerant line, remove the plastic seals/caps from the indoor unit refrigerant ports and the refrigerant line itself.

2. Align the Quick Connector on the line set with the corresponding valve on the indoor/outdoor unit, ensuring they are the same size. Screw the Quick Connecting line onto the quick connector and hand tighten, being careful not to cross-thread.

3. Using two open-ended wrenches, tighten the quick-connect nut on the line according to the torque specification in the table below. Use one wrench to hold the valve body steady and the other to tighten the nut. Be careful not to loosen the connection of the valve to the unit.

4. After making the connections at both the indoor and outdoor units, check all connections for leaks using a leak detection spray or soap suds. If any bubbles form, the system has a leak and the screw connectors must be retightened.

5. At the outdoor unit, 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. Screw the cover back onto the valve and tighten it well.

6. Repeat Step 5 for the bottom valve.

7. After the unit is installed, wrap the valve bodies at both the indoor and outdoor unit with the provided insulation material and ensure the valve is sealed.

Torque Table (for nut on the line set):

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.

1. Open the upper cover of the air handler.

2. Use tools to remove the knock-out holes of the upper cover where the heater will be installed.

3. On the air handler, remove the terminal block and power wires, loosen the screws, and remove the electric auxiliary heating cover plate.

4. Install the electric auxiliary heating assembly through the front. Note that the support assembly must lock into the support holes in the back of the cabinet.

5. Tighten the mounting screws to secure the heater assembly.

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

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

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

Use copper wire only to connect the unit. Refer to the indoor unit’s nameplate for exact specifications.

Choose an appropriate location for the outdoor unit based on the following standards:

1. Space Requirements:

– 24in (60cm) above the unit.

– 12in (30cm) from the back wall.

– 12in (30cm) on the left side.

– 24in (60cm) on the right side.

– 79in (200cm) in front of the unit.

2. Foundation: The location must be firm and solid to support the unit and prevent vibration.

3. Noise: The location should be where noise from the unit will not disturb other people.

4. Ventilation: The location must have good air circulation and ventilation.

5. Snowfall: The outdoor unit must be installed on a riser of at least 6in (15cm) in height or per local code to keep the unit above the local mean snowfall. Where snowfall is anticipated, take appropriate measures to prevent ice buildup and coil damage.

Do NOT install the unit in the following locations:

1. Near an obstacle that will block air inlets and outlets.

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

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

4. Near any source of combustible gas.

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

For extreme weather, if the unit is exposed to heavy wind, install it so that the air outlet fan is at a 90° angle to the direction of the wind. If needed, build a barrier. If the unit is frequently exposed to heavy rain or snow, build a shelter above it.

1. Step 1: Locate the base pan hole on the underside of the outdoor unit.

2. Step 2:

– Fit the rubber seal onto 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: 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 M10 bolts. Prepare the installation base according to the dimensions below.

Mounting Dimensions (18K Model):

If installing on the ground or a concrete mounting platform:

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

2. Pre-drill holes for expansion bolts.

3. Place a nut on the end of each expansion bolt.

4. Hammer expansion bolts into the pre-drilled holes.

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

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

7. Using a wrench, tighten each nut until snug.

If installing on a wall-mounted bracket:

1. Ensure the wall is made of solid brick, concrete, or similarly strong material, able to support at least four times the weight of the unit.

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

3. Pre-drill holes for expansion bolts.

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

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

6. Check that the mounting brackets are level.

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

8. Bolt the unit firmly to the brackets.

Before performing any electrical work, read these warnings:

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

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

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

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

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

6. 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.

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

8. Make sure to properly ground the unit.

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

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

11. 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.

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

13. Connect the outdoor wires before connecting the indoor wires.

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

Step 1: 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.

Step 2: Access the terminal block.

1. Remove the electrical box cover of the outdoor unit.

Step 3: Connect the wires.

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.

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

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.

1. 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 Wiring Diagram located on the cover of the electric control box.

Step 4: Reattach the electric box cover.

1. 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.

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 this feature, remove the jumper J1 from the control board and connect the installer-provided condensate overflow device to the CN5 terminal. When an overflow condition is present, the device should open the 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 during normal operation and closes 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. When the fan is running, the CN23 relay will be closed, which will allow 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 the DH and R terminals. 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. This can be used to power a UV light, fresh air damper, or ion generator.

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 in the manual for detailed information.

KEY1 Instructions (For Wired Controller Only):

1. Press KEY1 to enter the forced automatic mode.

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

3. Press KEY1 again to shut down.

4. While in forced cooling mode (FC), press and hold KEY1 for five seconds to enter forced defrost mode.

The DIP switches on the indoor unit control board configure various functions of the system. The 24V thermostat modes must refer to these settings.

Indoor Unit Dial Code Definitions:

The airflow volume is determined by the mode of operation, fan speed, and DIP switch settings. The constant airflow volume motor is applied, so the airflow volume is constant at all External Static Pressures (ESP) within the stated range (0 – 0.80 in. w.g.).

Air evacuation should be performed upon initial installation and when the unit is relocated. This process removes non-condensable gas and moisture from the system. Before starting, check that connective pipes and wiring are properly connected.

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. If there is a change, you have a leak that must be found and repaired.

8. If there is no pressure change, unscrew the cap from the packed valve (high pressure valve).

9. Insert a hexagonal wrench into the high-pressure valve and open it by turning the wrench 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 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. When opening, turn the wrench until it hits the stopper; do not force it further.

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

DO NOT mix refrigerant types. The system is pre-charged for a standard pipe length (e.g., 7.5m or 25′ in North America). If your pipe length exceeds the standard length, you must add additional refrigerant.

The additional refrigerant should be charged from the service port on the outdoor unit’s low pressure valve. The amount 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:

Confirm the following points before performing the test:

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, check that the room temperature is registered correctly, manual buttons work, the drainage system is draining smoothly, and there is no abnormal vibration or noise.

5. For the Outdoor Unit, check for any refrigerant leaks, ensure no abnormal vibration or noise, and confirm that wind, noise, and water do not disturb individuals nearby.

6. Perform a Drainage Test by running the unit in COOL mode and confirming water is discharged from the drainpipe without any leaks in the piping.

7. After a successful test, stop the unit and turn off the main power switch.

The following chart details the unit’s response to various 24V input signals at the terminal block. The Air Handling Unit (AUU) will turn off if the 24V input cannot meet the conditions in the table.
Note: 1 = 24V signal; 0 = No 24V signal; * = 1 or 0.