MRCOOL VERSA PRO MVP-24-HP-C-230-25 (01) PDF Document

The MRCOOL VERSA PRO MVP-24-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 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.

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.

WARNINGS:

• 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.

• 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.

WARNING FOR CLEANING & 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.

CAUTION:

• 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 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 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 data below represents the static pressures at the full required airflow used for AHRI testing.

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 (may vary depending on purchase & options). Use all parts for proper installation.

Included Optional Accessories:

You should 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.

Additionally, 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.

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

✓ Enough room for 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.

Clearance Requirements:

• Horizontal Installations: A minimum clearance of 1 inch (25.4 mm) on all sides. Outlet side pipe length should be 59 in. (1.5m).

• 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.

• Installation Position: A minimum of 24 inches is required for vertical and horizontal installations for service access.

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

Filter Dimensions (18K-24K Model):

Filter must meet the requirements of UL900.

CAUTION: 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.

• 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.

• The use of flexible duct collars will minimize the transmission of vibration and noise into the conditioned space. If the return air duct is short, 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. 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 Upflow/Horizontal Left configuration to a Horizontal Right or Downflow configuration, follow these steps:

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

2. Remove the upper cover assembly.

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

4. Identify the position of the evaporator’s temperature sensors (T1, T2, T2A, T2B) and Electronic Expansion Valve (EEV).

5. Unplug temperature sensors T1 and T2 from the control board.

6. Remove the T1 and T2 sensor wire ties.

7. Take out the evaporator and drain pan assembly. Rotate it 180° for a vertical downflow configuration.

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

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

10. Reinstall the T1, T2, T2A, and T2B sensor plugs and the electronic expansion valve (EEV) plug. Tie up the sensor wires. The evaporator is now reassembled. During this step:

• Cut the foam gasket to access knockouts.

• Remove knockouts as shown in the figure to route the wires.

• Hook the wire into the buckle and route it down through the wire slot. The wire body needs to pass through the wire groove from the drain pan and attach to the hook on the drain pan.

• Replace the foam gasket over the wires.

11. Use cable ties to attach the room temperature sensor as shown in the figure.

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 the 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.

For vertical discharge, the trap should have an anti-siphon air vent (vent T). The dimensions should be at least >50mm (2″) for the vertical sections of the trap and the air vent. The pipe should have a lean of 1/50.

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

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.

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

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

• 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 steps for connecting the refrigerant lines at both the indoor and outdoor units:

Important Information:

• Do not remove sealing caps until immediately before you install the lines.

• Ensure the quick-connector threading and valve body are free of dirt and contaminants.

• Only install refrigerant lines outdoors during dry weather.

• Do not smoke during installation.

• The equipment must never be operated without fully completing the refrigerant line connection.

Step 1: When ready to install, remove the plastic seals/caps from the unit’s ports and the refrigerant line. Align the Quick Connector on the line with the corresponding valve on the unit, ensuring they are the same size.

Step 2: Screw the Quick Connecting line onto the quick connector and hand-tighten, being careful not to cross-thread.

Step 3: Using two open-ended wrenches, tighten the quick-connect nut on the line according to the torque specification in the table below. Be careful not to loosen the connection of the valve to the unit body.

Torque Table:

Step 4: 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 connectors must be retightened.

Step 5: 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.

Step 6: Repeat Step 5 for the bottom valve.

Step 7: After the unit is installed, wrap the valve body with insulation material to ensure the valve is sealed.

Step 8: With the system now functional, check the system again for leaks while operating in both cooling and heating modes. If bubbles form, retighten the connectors until no leak exists.

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 (24K BTU/h model):

Installation Steps:

1. Open the upper cover of the air handler.

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

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

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 for the heat kit.

6. Wire the heat kit according to the wiring nameplate. Apply the wiring diagram sticker to the inside cover for future reference.

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

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

The following are the branch circuit requirements for units without electric heat. Use copper wire only to connect the unit.

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

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

• The location must be firm and solid to support the unit and prevent vibration.

• Noise from the unit will not disturb other people.

• Provides good air circulation and ventilation.

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

• 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.

For extreme weather: If the unit is exposed to heavy wind, install it so the air outlet fan is at a 90° angle to the wind direction. If needed, build a barrier. If the unit is frequently exposed to heavy rain or snow, build a shelter above it. Be careful not to obstruct air flow.

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: Make sure 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 a wall-mounted bracket with an M10 bolt. Prepare the installation base according to the dimensions chart.

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 bolts.

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

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

WARNING: WHEN DRILLING INTO CONCRETE, EYE PROTECTION IS RECOMMENDED AT ALL TIMES.

If installing on a wall-mounted bracket:

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

2. Pre-Drill holes for expansion bolts.

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

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

5. Check that the mounting brackets are level.

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

7. Bolt the unit firmly to the brackets.

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

CAUTION: Make sure the wall is made of solid brick, concrete, or of similarly strong material. The wall must be able to support at least four times the weight of the unit.

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.

• 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. 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.

WARNING: 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.

Connect the wires:

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

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

3. Clamp down the cable with the cable clamp.

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

5. Reinstall the cover of the electrical control box.

When connecting the wires, strictly follow the wiring diagram found inside the electrical box cover.

WARNING: 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.

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.

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 (e.g., in North America, it is 7.5m or 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:

CAUTION: Failure to perform the test run may result in unit damage, property damage, or personal injury.

Before Test Run:

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:

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.

This chart shows the unit’s operational state based on the 24V input terminals. Note: 1 = 24V signal, 0 = No 24V signal, * = 1 or 0. The AUU will turn off if the 24V input cannot meet the table.