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

The MRCOOL VERSA PRO MVP-24-HP-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. Additional components to complete this form of installation will have to be purchased separately. This form of installation also requires 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.

The following warnings must be observed:

1. 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.

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

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

4. 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.

5. 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.

6. 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.

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

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

Please adhere to the following product use 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.

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.

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, 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.

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.

Cleaning & Maintenance Warnings:

• 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.

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

Fuse Specifications:

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 with your MRCOOL VERSA PRO MVP-24-HP-230-25. Use all installation parts and accessories to install the system. Improper installation may result in water leakage, electrical shock, fire, and/or equipment failure.

Included Optional 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.

Installation Safety Precautions:

• 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.

• 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.

• 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.

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

Locations to AVOID for indoor unit installation:

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.

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.

Indoor Unit Dimensions for Model Capacity 18K-24K:

Required Filter Dimensions for Model Capacity 18K-24K (Filter must meet the requirements of UL900):

The 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.

The MRCOOL VERSA PRO MVP-24-HP-230-25 indoor unit can be installed in a Vertical (downflow or upflow) or a Horizontal (right or left) configuration. For horizontal installations, ensure at least 5 inches (12.7cm) of clearance below the unit.

The available airflow directions are:

• Upflow

• Downflow

• Horizontal left

• Horizontal right

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

To change the configuration from the default vertical upflow/horizontal left 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. You must remove the bottom cover first, then the second cover plate.

4. Identify the position of the evaporator’s temperature sensors. For the 18-24K Model, these are T1, T2, T2B, and the 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

6. Remove T1 and T2 sensor wire ties.

7. Take out the evaporator and drain pan assembly and rotate it 180°.

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 T1, T2, T2A, and T2B sensor plugs and the electronic expansion valve (EEV) plug. Tie up the sensor wires. The evaporator is now assembled in place. This involves:

• Cutting the foam gasket.

• Removing knockouts as shown in the figure.

• Hooking the wire into the buckle and routing it down from the wire slot.

• Replacing the foam gasket over the wires.

• NOTE: The wire body needs to pass through the wire groove from the drain pan and attach to the hook on the drain pan.

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 drainage pipes.

The MRCOOL VERSA PRO MVP-24-HP-230-25 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.

Drain Trap Specifications:

• A P-trap with an anti-siphon air vent (vent T) is required.

• The vertical sections of the trap should be >50mm (2″).

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

• The horizontal pipe must have a lean-over (slope) of 1/50.

WARNINGS and Notices:

• After removing the drain pan plug(s), verify that the drain opening is fully clear and free of debris.

• 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.

• Insulate all piping to prevent condensation, which could lead to water damage.

• If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction.

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

• If installed above a finished living space, a secondary drain pan must be installed under the entire unit, and its condensate drain line must be routed where the excess drainage is not in view.

Maximum Length and Drop Height:

Oil Trap Requirements:

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 36,000 Btu/h (like the MRCOOL VERSA PRO MVP-24-HP-230-25), 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 instructions for connecting the refrigerant lines to both the indoor and outdoor units. Failure to install in accordance with these instructions may void the warranty.

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.

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

Indoor Unit Connection Steps:

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

2. Align the Quick Connector on the line set with the corresponding valve on the indoor 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 (2) on the line according to the torque specification in the table below. Be careful not to loosen the connection (1) to the valve body.

Outdoor Unit Connection Steps:

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

2. Remove the plastic seals/caps from the outdoor unit ports and refrigerant line ends.

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

4. Using two open-ended wrenches, tighten the quick-connect nut according to the torque specification in the table below.

Leak Check and Valve Opening:

5. After all connections are tight, check that they 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.

6. Remove the cover on the top (liquid) 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.

7. Remove the cover on the bottom (gas) 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. The valve is now open. Screw the cover back onto the bottom valve and tighten it well.

8. After opening the valves, wrap the valve bodies with the provided insulation material and ensure the valves are sealed.

Torque Table for Quick-Connect Nuts:

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 for MRCOOL VERSA PRO MVP-24-HP-230-25 (24K Btu/h):

Installation Steps:

1. Open the upper cover of the indoor unit.

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.

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.

6. Wire according to the wiring nameplate. Apply the wiring diagram 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. The specification may be different between models; refer to the indoor unit’s nameplate.

Choose a location that meets the following standards:

• Space Requirements: Meets all spatial requirements shown in the installation space diagrams (at least 12in on left, 24in on right, 24in above, 12in from back wall, and 79in in front).

• Firm & Solid: The location can support the unit and will not vibrate.

• Low Noise: Noise from the unit will not disturb other people.

• Good Ventilation: Good air circulation and ventilation.

• Cold Climates: 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 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.

• Heavy Wind: 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 in front of the unit to protect it from extremely heavy winds.

• Heavy Rain or Snow: If the unit is frequently exposed to heavy rain or snow, build a shelter above the unit to protect it from the rain or snow. Be careful not to obstruct air flow around the unit.

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

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

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

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

For 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. Use the dimensions provided in the mounting dimensions table.

If installing the unit 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.

If installing the unit 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.

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

• 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.

• 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: Connect the cable.

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.

WARNING: RISK OF ELECTRIC SHOCK CAN CAUSE INJURY OR DEATH. DISCONNECT ALL REMOTE ELECTRIC POWER SUPPLIES BEFORE SERVICING. ISOLATE THE POWER SUPPLY LEADS AND COMMUNICATION LEADS BY THE STRAIN RELIEF AND KEEP POWER SUPPLY LEADS AWAY FROM COMMUNICATION LEADS.

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.

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 the CN5 port on the control board. When an overflow condition is present, the device should open the connection, signaling the unit to turn off the system.

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.

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

Before Test Run Checklist:

A test run must be performed after the entire system has been completely installed. 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.

The following table shows the 24V input terminal logic. Note: 1 = 24V signal, 0 = No 24V signal, * = 1 or 0. The unit will turn off if the 24V input cannot meet the table.