MRCOOL MVP-36-HP-C-230-00 Ducted Split System Residential Heat Pump Owner’s Manual

MRCOOL MVP-36-HP-C-230-00 Ducted Split System Residential Heat Pump

Specifications

Product Name: Versa Pro Central Ducted 36-60K

Models:

• CONDENSER: MVP-36-HP-C-230-00, MVP-36-HP-MUAH-230-00
• AIR HANDLER: MVP-48-HP-C-230-00, MVP-48-HP-MUAH-230-00, MVP-60-HP-C-230-00, MVP-60-HP-MUAH-230-00
• COMPLETE SYSTEM: MVP-36-HP-230-00, MVP-48-HP-230-00, MVP-60-HP-230-00

Product Usage Instructions

1. Safety

Before starting the installation or operation of the system, carefully read and understand all safety instructions provided in the manual.

2. Accessories

Ensure you have all the necessary accessories mentioned in the manual for a smooth installation process.

3. Indoor Unit Installation

Follow the detailed instructions provided in the manual for proper installation of the indoor unit including mounting and electrical connections.

4. Refrigerant Piping Connection

Refer to section 4 for guidelines on pipe length, elevation, and connecting refrigerant piping correctly to ensure optimal system performance.

5. Electric Heat Kit Installation

If your unit includes an electric heat kit, follow the installation instructions provided in section 5 carefully.

6. Confirmation of Indoor Unit

Verify the indoor unit setup according to the guidelines provided in section 6 based on whether it has electric heat or not.

7. Outdoor Unit Installation

Properly locate the outdoor unit, install drain fittings, and anchor it securely following the instructions in section 7 for outdoor unit installation.

8. Electrical Connections

Connect the electrical components as per the wiring diagrams and guidelines provided in section 8 for safe and efficient operation.

Frequently Asked Questions

• Q: How often should I perform maintenance on the Versa Pro Central Ducted system?
  • A: Regular maintenance is essential for optimal performance. It is recommended to have professional maintenance checks at least once a year.
• Q: Can I install the system myself?
  • A: Installation of the Versa Pro Central Ducted system requires technical knowledge and expertise. It is recommended to hire a professional HVAC technician for installation to ensure proper setup and safety.

Versa Pro

Central Ducted

36-60K
Installation & Owner’s Manual

MODELS:

CONDENSER:

AIR HANDLER:

MVP-36-HP-C-230-00 MVP-36-HP-MUAH-230-00 MVP-48-HP-C-230-00 MVP-48-HP- MUAH-230-00 MVP-60-HP-C-230-00 MVP-60-HP-MUAH-230-00

COMPLETE SYSTEM:

MVP-36-HP-230-00 MVP-48-HP-230-00 MVP-60-HP-230-00

Read this manual carefully before installation and keep it where the operator can easily find it for future reference.
Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice.
Version Date: 04/30/2024 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.

mrcool.com

Contents

IMPORTANT INSTALLATION INFORMATION!

Refrigerant Line Set Connection Options, Requirements, and Stipulations 18K/24K/30K Capacity Units – Are designed to use the MRCOOL® Quick Connect® Pre-Charged Line Set as the preferred type of refrigerant piping. If this method is used, you DO NOT have to retain the services of professional HVAC installer for this step. However, these capacity units can also be installed using a traditional flare nut configuration of refrigerant piping. If this method is selected, you ARE REQUIRED to retain the services of a professional HVAC installer 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. 36K/48K/60K Capacity Units – Are designed to be installed using either a traditional flare nut configuration of refrigerant piping or the optional MRCOOL® No-Vac® Quick Connect® Pre-Charged Line Set. If the optional No-Vac Quick Connect Line Set is used, you DO NOT have to retain the services of a professional HVAC installer. If the traditional flare nut configuration is selected, you ARE REQUIRED to retain the services of a professional HVAC installer. Stub pipes and copper nuts are included with these capacity units to complete this type of installation. 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.

mrcool.com

2

SAFETY

Safety Precautions
Read Before Using
Incorrect usage may cause serious damage or injury.
The symbols below are used throughout this manual to indicate instructions that should be followed closely or actions that should be avoided to prevent death, injury, and/or property damage.

Indicates a medium level of risk which, if not avoided, may

WARNING

result in death or serious injury.

CAUTION

Indicates a low degree of risk which, if not avoided, may result in minor or moderate injury.

NOTICE

Indicates important information but not danger.

WARNING FOR PRODUCT INSTALLATION
INSTALLATION MUST BE PERFORMED BY AN AUTHORIZED DEALER OR SPECIALIST. DEFECTIVE INSTALLATION CAN CAUSE WATER LEAKAGE, ELECTRICAL SHOCK, OR FIRE.
ELECTRICAL WORK MUST BE COMPLETED BY A QUALIFIED ELECTRICAL TECHNICIAN
DO NOT install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it could cause fire.
DO NOT turn on the power until the installation and all work has been completed.
DO NOT install a unit equipped with an auxiliary electric heater within 3 ft (1 m) of any combustible materials. 1. Installation must be performed according to the installation instructions. Improper installation could cause water leakage, electrical shock, fire, and could void the warranty. (In North America, all wiring/electrical work must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.) 2. Contact an authorized service technician for repair or maintenance of this unit. This appliance must be installed in accordance with national wiring regulations. 3. Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, and/or failure of the unit. 4. Install the unit in a firm location that can support the unit’s weight. If the location cannot support the unit’s weight, or the installation is not done properly, the unit may drop and cause serious injury and damage. 5. Install the drainage piping according to the instructions in this manual. Improper drainage could cause water damage to your home and/or property. 6. When moving or relocating the air conditioner, consult experienced service technicians for disconnection and re- installation of the unit. 7. For detailed information of 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.

3

mrcool.com

1 SAFETY

WARNING FOR PRODUCT USE
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. Call your local dealer, or MRCOOL® tech support at 270-366-0457, for further assistance.
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 WARNINGS
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.

mrcool.com

4

1 SAFETY

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.

TAKE NOTE OF 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.

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.

NOTE ON FLUORINATED GASES (NOT APPLICABLE FOR R-290 UNITS):
1. This unit contains fluorinated greenhouse gases. 2. For specific information on the type of gas and the amount, please refer to the relevant label on the unit
itself. 3. Service, maintenance, and repair of this unit must be performed by a certified technician. 4. Product un-installation and recycling must be performed by a certified technician. 5. When checking the unit for leaks, maintain proper record-keeping of all checks.
NOTE ON STATIC PRESSURE:

The allowed static pressure range of the air conditioner on site 0.00-0.80 in H20 (0-200 Pa). The data below represents the static pressures at the full required airflow used for AHRI testing.

Model

18-24K

30-36K

48-60K

Pressure

0.5 in H20 (125 Pa)

0.5 in H20

0.5 in H20

(125 Pa)

(125 Pa)

Units: Inch of Water Column (Pascals)

NOTE: The maximum functional total external static pressure cannot exceed 0.80 in WC (200 Pa).

The airflow reduces significantly with pressures above and beyond 0.80 in WC (200 Pa). The system design should allow for the increased resistance of filters as they become dirty.

5

mrcool.com

PACKING LIST

2-Accessories

The listing below shows the accessories and parts (these may vary depending on purchase & options). Use all of the installation parts and accessories to install the system. Improper installation may result in water leakage, electrical shock, fire, and/or equipment failure.

PART

LOOKS LIKE

QUANTITY

Owner’s & Installation Manual

1

Remote Control

NOTE:

The wired system

control functions as

an IR receiver for the

1

handheld remote. If the remote is not used, it

must be retained with

the indoor unit to adjust

parameters, and for

troubleshooting.

Remote Control Manual

1

Batteries

2

Wired Thermostat 1

Thermostat Manual
Cable Ties
Foam Insulator
Braze to Flare Adapter (Optional)
Included Optional Accessories:
PART Drain Fitting (In Outdoor Packaging)
Seal (In Outdoor Packaging)
Flare Nut (In Indoor Packaging)

LOOKS LIKE

1 2 4 2
QUANTITY 1 1 1

mrcool.com

6

INDOOR UNIT INSTALLATION

3.1 Indoor Unit Parts

3.2 Installation Safety Precautions
CAUTION
· Install the indoor and outdoor units, cables, and wires at least 3.2 ft (1 m) away from televisions or radios to prevent static or image distortion. Depending on the appliances, a 3.2ft (1m) distance may not be sufficient.
· The indoor unit must be electrically grounded per national and local electrical codes.
WARNING
DO NOT install the indoor unit in any of the following locations: · Areas where oil drilling or fracking is being performed. · Coastal areas with high salt content in the air. Areas with caustic gases in the air, such as near laundry vents. · Areas with strong electromagnetic waves. · Areas where flammable materials or gas are stored. · Rooms with high humidity, such as bathrooms or laundry rooms. · Areas where the air inlet and outlet may be obstructed.

WARNING
· Be sure to apply sealant around any places where wires, refrigerant piping, and condensate piping enter the air handler cabinet.
· Use duct tape and/or Permagum to seal any space around the holes where condensate piping exits the cabinet. Warm air must not be allowed to enter through any gaps or holes in the cabinet.
· Remove all accessories and packing from the air outlet before installation.
WARNING
· There must be an airtight seal between the bottom of the air handler and the return air plenum. In order to achieve this, use fiberglass sealing strips, foil duct tape, caulking, or an equivalent sealing method to ensure a tight seal.
· Return air must not be drawn from a room where the air handler or any gas- fueled appliance (ex: water heater), or carbon monoxide-producing device (ex: wood fireplace) is installed.

7

mrcool.com

3 INDOOR UNIT INSTALLATION

3.3 Installation Preparation & Precautions
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.

3.4 Dimensions & Clearance Requirements
Indoor Unit Clearance Requirements
The distance between the mounted indoor unit should met the specifications illustrated in the following diagrams.

Horizontal Installations Plenum Clearances

Vertical Installations

Outlet side pipe length: 59 in. (1.5m)

Mounting instructions: 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.

mrcool.com

8

3 INDOOR UNIT INSTALLATION

Dimensions

Filter Dimensions

Filter must meet the requirements of UL900.

Model Capacity (BTU/H) 18K-24K

Width (W)

Depth Thickness

(D)

(t)

16 in

20 in

.96 in

(406.4 mm) (508 mm) (25.4 mm)

30K-48K

19.5 in

20 in

.96 in

(495.3 mm) (508 mm) (25.4 mm)

60K

23 in

20 in

.96 in

(584.2 mm) (508 mm) (25.4 mm)

Dimensions Length of A Length of B Length of C Length of D Length of E

Model Capacity (BTU/H)

18K-24K

30K-48K

60K

45 in

49 in

53 in

(1143 mm) (1245 mm) (1346 mm)

21 in

21 in

21 in

(533 mm) (533 mm) (533 mm)

17.5 in

21 in

24.5 in

(445 mm) (534 mm) (622 mm)

15.75 in

19.3 in

22.8 in

(400 mm) (490 mm) (580 mm)

10.25 in

10.25 in

10.25 in

(260 mm) (260 mm) (260 mm)

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

9

mrcool.com

3 INDOOR UNIT INSTALLATION
Installation Position Requirements
Top View

Side View

Note on Ductwork & Connections
· Air supply and return can be handled in one of several ways depending on which is best suited for the type of installation. Please see the dimensions on the previous page to determine duct inlet and outlet connection sizes to match the air handler. 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 it electric shock and/or personal injury.

mrcool.com

10

3 INDOOR UNIT INSTALLATION
3.5 Installation Mounting Positions The unit can be installed in a Vertical (downflow or upflow) or a Horizontal (right or left) configuration.
Notice
· Vertical Up and Horizontal Left installation does not need to change the direction of the evaporator. 3.6 Airflow Directions

11

mrcool.com

3 INDOOR UNIT INSTALLATION
3.7 Wire & Piping Connections
Follow these steps to perform a vertical down and horizontal right installation:
Step 1: Open the upper cover. Step 2: Open the cover of the electronic control box. Step 3: Connect the wire according to the wiring diagram. Step 4: Connect the pipes and install drainage pipes.
3.8 Installation for Horizontal Right or Downflow Configurations The steps below detail the installation of a horizontal left or vertical upflow indoor unit once it has been securely mounted in place.

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

2. Remove the upper cover assembly.

4. Identify the position of the evaporator’s temperature sensor.

3. Remove evaporator cover plate.

18-24K Model

30-48K Model
mrcool.com

60K Model
12

3 INDOOR UNIT INSTALLATION

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

7. Take out the evaporator and drain pan and rotate 180° (when a vertical down configuration is needed).

6. Remove T1 and T2 Sensor wire ties.

NOTE
This unit model does not have T2A, T2B, or EEV

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

13

mrcool.com

3 INDOOR UNIT INSTALLATION

9. Reinstall the evaporator and drain pan.

10. Reinstall T1, T2, T2A, and T2B sensor plugs and electronic expansion valve (EEV) and tie up the sensor wires. The
evaporator is now assembled in place.

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

mrcool.com

14

3 INDOOR UNIT INSTALLATION

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

13. Connect the wire according to the wiring diagram.
14. Reassemble the upper cover and reinstall the filter and filter cover plate.

12. Reinstall evaporator cover plate.

15. Connect the pipes and install drainage pipes.
CAUTION FOR PIPE INSTALLATION
· Insulate all piping to prevent condensation, which could lead to water damage.
· The drainpipe is used to drain water away from the unit. If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction.
· In HEAT mode, the outdoor unit will discharge water. Ensure that the drain hose is placed in an appropriate area to avoid water damage and icy conditions on walkways.
· DO NOT pull the drainpipe forcefully. This could disconnect it.
NOTICE
If installed above a finished living space, a secondary drain pan (as required by many building codes) must be installed under the entire unit and its condensate drain line must be routed where the excess drainage is not in view.

15

mrcool.com

3 INDOOR UNIT INSTALLATION
NOTICE ON PIPE PURCHASING
Installation requires PVC pipe or other suitable material per local and national codes. These can be found at your local hardware store or dealer.
WARNING
· After removing the drain pan plug(s), check the drain hole(s) to verify that the drain opening is fully clear and free of any debris. Also check to ensure no debris has fallen into the drain pan during installation that could plug the drain opening. Apply sealant around the exiting drain pipe and the liquid and suction lines to prevent the infiltration of humid air.
· On units of this type in which the blower “draws” in air rather than “blows” air through the coil, traps must be installed in the condensate drain lines (primary and auxiliary, if used). Traps prevent the blower from drawing air through the drain lines into the air supply.
3.9 Upflow & Horizontal Left Configurations
The unit operates with a negative pressure at the drain connections and 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.
Vertical Discharge
NOTICE
Horizontal runs must also have an anti-siphon air vent (standpipe) installed ahead of the horizontal run to eliminate air trapping. NOTE ON DRAINPIPE INSTALLATION: · The figure shows how to trap or plug all drains during
vertical discharge. · The figure shows how to trap or plug all drains during
right-hand discharge. · The seal plug is supplied and should be screwed tightly
by hand only. · Incorrect installation could cause water to flow back
into the unit and flood.
CAUTION
· The drainpipe outlet should be at least 1.9 in (5 cm) above the ground.
· If it touches the ground, the unit may become blocked and malfunction.

mrcool.com

16

REFRIGERANT PIPING CONNECTION

WARNING ON REFRIGERANT PIPING
All field piping must be completed by a licensed technician and must comply with all local and national regulations. · When the air conditioner is installed in a small room, precautions must be taken to prevent the refrigerant
concentration in the room from exceeding the safety limit. · When installing the refrigeration system, ensure that air, dust, moisture, or foreign substances do not enter
the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the refrigeration cycle, explosion, or injury. · Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas is both toxic and may be flammable. Ensure there is no refrigerant leakage after completing the installation work.

4.1 Pipe Length & Elevation Maximum length and drop height

Model Capacity

Maximum

Maximum

(BTU/H)

Length of Piping Drop Height

18K

98.4 ft (30 m) 65.6 ft (20 m)

24K/30K

164 ft (50 m)

82 ft (25 m)

36K/48K/60K

213 ft (65 m) 98.4 ft (30 m)

Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meet the requirements shown in the table:

Name

Shape

Quantity

6.35 (1/4in)

Liquid Side

9.52 (3/8in)

Connecting Pipe
Assembly

12.7 (1/2in) 16 (5/8in)

Gas Side

19 (3/4in)

22 (7/8in)

Parts must be purchased
separately. Consult your
dealer or technician about the proper pipe size for the
unit you purchased.

CAUTION-OIL TRAPS
· If oil flows back into the outdoor unit’s compressor, this may cause liquid compression or deterioration of the oil return. Oil traps in the rising gas pipe can prevent this.
· For units less than 36,000Btu/h, an oil trap should be installed every 6m (19.7ft) of vertical suction line riser.
· For units greater than 36,000Btu/h, an oil trap should be installed every 10m(32.8ft) of vertical suction line riser.

17

mrcool.com

4 REFRIGERANT PIPING CONNECTION

4.2 Connecting Refrigerant Piping
CAUTION
Insulate both the gas and liquid piping to prevent condensation.

Air Handler Model 18K/24K
24K/30K/ 36K/48K
60K

Air Handler Unit Connection

Liquid

3/8

Adapter Required at Indoor Unit
3/8flare–>3/8braze

Gas

3/4

3/4flare–>3/4braze

Outdoor Model
18K/24K

Liquid

3/8

3/8flare–>3/8braze

24K (Hyper Heat)

/30K/

Gas

3/4

3/4flare–>3/4braze

36K/48K

Liquid

3/8

3/8flare–>3/8braze

60K

Gas

7/8

7/8flare–>7/8braze

Outdoor Unit Connection
Liquid 3/8

Gas

5/8

Liquid 3/8

Gas

3/4

Liquid 3/8

Gas

7/8

Adapter Required at Outdoor Unit
3/8flare–>3/8braze 5/8flare–>3/4flare 5/8flare–>3/4braze
3/8flare–>3/8braze
3/4flare–>3/4braze
3/8flare–>3/8braze 7/8flare–>7/8braze

Step 1: Cut Pipes When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance.
· Measure the distance between the indoor and outdoor units.
· Using a pipe cutter, cut the pipe a little longer than the measured distance.
· Make sure that the pipe is cut at a perfect 90° angle.

NOTICE
Do not deform pipe while cutting. Be careful not to damage, kink, or deform the pipe while cutting. This will drastically reduce the heating performance.
Step 2: Remove Burrs Burrs can affect the air-tight seal of the refrigerant piping connection. They must be completely removed. · Hold the pipe at a downward angle to prevent
burrs from falling into the pipe. · Using a reamer or deburring tool, remove all burrs
from the cut section of the pipe.

mrcool.com

18

4 REFRIGERANT PIPING CONNECTION

Step 3: Flare Pipe Ends

· Place flaring tool onto the form.

Proper flaring is essential to achieve an airtight seal.
· After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe.
· Sheath the pipe with insulating material.

· Turn the handle of the flaring tool clockwise until the pipe is fully flared.
Piping Extension Beyond Flare Form

· Place flare nuts on both ends of the pipe. Make sure they are facing in the right direction, because you can’t put them on or change their direction after flaring.

· Remove PVC tape from ends of pipe when ready to perform flaring work.

· Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring.

· Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form.

Step 4: Connect Pipes
Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit. First connect the lowpressure pipe, then the high pressure pipe.
· When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes.
· Align the center of the two pipes that you will connect.
· Tighten the flare nut snugly by hand.
· Using a wrench, grip the nut on the unit tubing.
· While firmly gripping the nut, use a torque wrench to tighten the flare nut according to the torque valves in the table above.

19

mrcool.com

4 REFRIGERANT PIPING CONNECTION
NOTICE
Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from the unit.

· After connecting the copper pipes to the indoor unit, wrap the power cable, signal cable, and the piping together with binding tape.

CAUTION
Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite. · Make sure the pipe is properly connected. Over
tightening may damage the bell mouth and under tightening may lead to leakage.
NOTICE
Minimum Bend Radius Carefully bend the tubing in the middle according to the diagram below. DO NOT bend the tubing more than 90° or more than 3 times.

NOTICE
DO NOT intertwine or cross the signal cable with any other wiring.
· Thread this pipeline through the wall and connect it to the outdoor unit.
· Insulate all the piping, including the valves of the outdoor unit.
· Open the stop valves of the outdoor unit to start the flow of the refrigerant between the indoor and outdoor unit.
CAUTION
Check to make sure there is no refrigerant leak after completing installation work. If there is a refrigerant leak, ventilate the area immediately and evacuate the system (refer to Air Evacuation section of this manual).

mrcool.com

20

4 REFRIGERANT PIPING CONNECTION

21

mrcool.com

5 ELECTRIC HEAT KIT INSTALLATION

5-Electric Heat Kit Installation

NOTICE
Installation must be performed by a licensed contractor. Please take necessary precautions when performing the installation.

Accessories
Name Manual Foam Gasket Screws Silicone Breaker Cover Electric Auxiliary Heating Wiring Diagram Circuit Breaker Label

Quantity 2 1 7 1
1
1

Installation Preparation
Before installation, confirm the electric auxiliary heat module and supplied accessories are present and free of damage. Do not attempt to install if damage is present.
Electric Auxiliary Heat Module Installation and Wiring Operation

Model Size Selection
For installations requiring supplemental heating, the optional Electric Auxiliary Heat Module is available in sizes from 3kW to 25kW to accommodate appropriate sizing given the specific heat load and eletrical requirements of each installation. Refer to the table below for selection of available sizes of each model, being sure to avoid improper matching.

Step 1: Open the upper cover.

Model (Btu/h)

3kW

5kW

8kW

10kW

15kW

20kW

25kW

18K Y Y Y Y

–

–

–

24K – Y Y Y

Y

–

–

30K – Y Y Y

Y

–

–

36K – Y Y Y

Y

Y

–

48K – – Y Y

Y

Y

–

60K –

–

–

Y

Y

Y

Y

NOTICE
Only use compatible modules certified for use with the model. Refer to the Electric Auxiliary Heat Model specification for additional details to ensure proper selection and installation.

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

mrcool.com

22

ELECTRIC HEAT KIT INSTALLATION

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

Step 5: Tighten the mounting screws.

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

Step 6: Wire according to the wiring nameplate. Apply the wiring diagram to the inside cover for future reference and maintenance. Step 7: Install the upper cover and the silicone breaker cover.

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

23

mrcool.com

CONFIRMATION OF INDOOR UNIT

6.1 Units with Electrical Heat

NOTICE

· The electric auxiliary heating wiring diagram is packed with the accessories. · If the branch circuit wire length exceeds 100ft, consult NEC 210-19a to determine maximum wire length. · Use 2% voltage drop.

After the electric heating wiring is connected, please confirm the following before powering on: · Check and ensure a secure connection of all wiring. · Ensure that wire size is properly selected per NEC or local codes.

Specifications
5kW 8kW 10kW 15kW 20kW

Number of Circuit Breakers 1 1 1 2 2

Number of Relays
1 2 2 3 4

Number of Power Cord Groups 2 2 2 3 3

Number of Power Cord Grounding Screws 2 2 2 3 3

6.2 Units without Electrical Heat

Unit Size
18K 24K 30K 36K 48K 60K

VoltsPhase
208/230-1 208/230-1 208/230-1 208/230-1 208/230-1 208/230-1

Rated Current
(A)
2.0 3.0 3.5 4.0 6.0 7.0

Minimum Circuit Amps
2.5 4.0 4.5 5.0 7.5 9.0

Branch Circuit

Minimum Wire Fuse/Circuit

Size AWG

Breaker Amps

14#

15.0

14#

15.0

14#

15.0

14#

15.0

14#

15.0

14#

15.0

Use copper wire only to connect unit. If other than uncoated (non-plated) 75°C copper wire (solid wire for 10 AWG and smaller, stranded wire for larger than 10 AWG) is used, consult applicable tables of the National Electric Code (ANSI/NFPA 70).

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

6.3 Auxiliary Heater Electrical Data

Heater Model

Heater kW

Internal Circuit Protection

Circuit 1 208/230V

Heater Amps

MCA (1)

MOCP (2)

Circuit 2

Circuit 2

Heater Amps

MCA (1)

MOCP (2)

Heater MCA MOCP Amps (1) (2)

CENTRALHK05 5

Ckt Bkr 18.0/20.0 23.0/27.0 25.0/30.0

/

/

/

/

/

/

CENTRALHK08 8

Ckt Bkr 28.8/32.0 37.0/42.0 40.0/45.0

/

/

/

/

/

/

CENTRALHK10 10

Ckt Bkr 36.0/40.0 46.0/53.0 50.0/60.0

/

/

/

/

/

CENTRALHK15 15

Ckt Bkr 18.0/20.0 23.0/27.0 25.0/30.0 36.0/40.0 46.0/53.0 50.0/60.0 /

/

/

CENTRALHK20 20

Ckt Bkr 36.0/40.0 46.0/53.0 50.0/60.0 36.0/40.0 46.0/53.0 50.0/60.0 /

/

/

mrcool.com

24

6 CONFIRMATION OF INDOOR UNIT
6.4 Electric Auxiliary Heating Wiring Diagrams

25

mrcool.com

6 CONFIRMATION OF INDOOR UNIT

mrcool.com

26

OUTDOOR UNIT INSTALLATION

NOTICE
Install the unit by following local switch regulations. These may differ slightly between different regions.
7.1 Outdoor Unit Location Selection Before installing the outdoor unit, you must choose an appropriate location. The following are standards to help choose an appropriate location for the unit.

Meets all spatial requirements shown in installation Space Requirements above.

Firm & Solid–the location can support the unit and will not
vibrate.

Noise from the unit will not disturb other people.

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

Good air circulation and
ventilation.

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.

CAUTION FOR EXTREME WEATHER

If the unit is exposed to heavy wind, install 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. See figures below. 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.

27

mrcool.com

7 OUTDOOR UNIT INSTALLATION
7.2 Drain Fitting Installation
Step 1: Find the base pan hole on the outdoor unit.

Step 2: · Fit the rubber seal on the end of the drain fitting that will connect to the
outdoor unit. · Insert the drain fitting into the hole in the base pan of the unit. The drain
fitting will click into place. · Connect a drain hose extension (not included) to the drain fitting to redirect
water from the unit during heating mode.
IN COLD CLIMATES
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze inside the hose and flood the unit.

mrcool.com

28

7 OUTDOOR UNIT INSTALLATION
7.3 Anchor Outdoor Unit The outdoor unit can be anchored to the ground or to a wall-mounted bracket with an M10 bolt. Prepare the installation base of the unit according to the dimensions below.

Model
18K 24K/30K/36K
48K/60K

Outdoor Unit Dimensions

W

H

D

mm

inch

mm

inch

mm

inch

890

35

673

26-1/2

342 13-15/32

946

37-1/4

810 31-29/32 410 16-5/32

952

37-1/2 1333 52-1/2

415 16-11/32

Mounting Dimensions

A

B

mm

inch

mm

inch

663

26-1/8

354 13-15/16

673

26-1/2

403

15-7/8

634 24-35/36 404 15-29/32

or(m259oc.rm8ein)

or(m259oc.rm8ein)

29

(519o5ir0nmcmo)re

23(6o.60ricnmmo) re

1(31o08r0inmcmo)reThe

Rows of Series Installation relations between H, A, and L are as

follows:

L

A

L H

L 1/2H 1/2H < L H

25cm / 9-13/16in or more 30cm / 11-13/16in or more

L > H

Cannot be installed

mrcool.com

7 OUTDOOR UNIT INSTALLATION

If installing the unit on the ground or concrete mounting platform, do the following:
· Mark the positions for four expansion bolts based on the dimensions chart.
· Pre-Drill holes for expansion bolts. · Place a nut on the end of each expansion bolt. · Hammer expansion bolts into the pre-drilled holes. · Remove the nuts from expansion bolts, and place
the outdoor unit on bolts. · Put a washer on each expansion bolt, then replace
the nuts. · Using a wrench, tighten each nut until snug.
WARNING
WHEN DRILLING INTO CONCRETE, EYE PROTECTION IS RECOMMENDED AT ALL TIMES.

If installing the unit on a wall-mounted bracket, do the following:
· Mark the position of the bracket holes based on the dimensions chart.
· Pre-Drill holes for expansion bolts. · Place a washer and nut on the end of each
expansion bolt. · Thread expansion bolts through the holes in the
mounting brackets, put mounting brackets into position, and hammer the expansion bolts into the wall. · Check that the mounting brackets are level. · Carefully lift the unit and place its mounting feet on brackets. · Bolt the unit firmly to the brackets. · If allowed, install the unit with rubber isolator pads to reduce vibrations and noise.
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.

mrcool.com

30

ELECTRICAL CONNECTIONS

8.1 Wiring Precautions
WIRING WARNINGS
Before performing any electrical work, read these warnings: · BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SYSTEM. · All wiring must comply with local and national electrical codes, regulations, and must be installed by a licensed
electrician. · All electrical connections must be made according to the Electrical Connection Diagram located on the panels
of the indoor and outdoor units. · If there is a serious safety issue with the power supply, stop work immediately. Do not resume the install until
the safety issue is properly resolved. · Power voltage should be within 90-110% of rated voltage. Insufficient power supply can cause malfunction,
electrical shock, or fire. · Installation of an external surge suppressor at the outdoor disconnect is recommended. · If connecting power to fixed wiring, a switch or circuit breaker that disconnects all poles and has a contact
separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. The qualified technician must use an approved circuit breaker or switch. · Only connect the unit to an individual branch circuit. Do not connect another appliance to that circuit. · Make sure to properly ground the unit. · Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in product malfunction and possible fire. · Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the unit. · To avoid getting electric shock, never touch the electrical components soon after the power supply has been turned off. After turning off the power, always wait 10 minutes or more before you touch the electrical components. · Ensure electrical wiring does not cross with signal wiring. This may cause distortion, interference, or possibly damage the circuit boards. · No other equipment should be connected to the same power circuit. · Connect the outdoor wires before connecting the indoor wires.
8.2 Wiring Overview

(purchased separately)

(purchased separately)

(purchased separately)

(purchased separately) The diagrams are for explanation purpose only. Individual units may be slightly different. The actual diagram shall prevail.

31

mrcool.com

8 ELECTRICAL CONNECTIONS

8.3 Outdoor Unit Wiring

WARNING

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

Prepare the cable for connection Step 1: 1. You must first choose the right cable size. 2. Using wire strippers, strip the rubber jacket
from both ends of the signal cable to reveal approximately 5.9in (15cm) of wire. 3. Strip the insulation from the ends. 4. Stranded wire requires u-lugs or ring terminals to be crimped onto the ends of the wire.
NOTICE
When connecting the wires, strictly follow the wiring diagram found inside the electrical box cover. Choose the cable type according to the local electrical switches and regulations. Choose the right cable size according to the Minimum Circuit Ampacity indicated on the nameplate of the unit.
Step 2: Remove the electrical box cover of the outdoor unit. If there is no cover on the outdoor unit, take off the bolts from the maintenance board and remove the protection board.

4. Clamp down the cable with the cable clamp. 5. Insulate unused wires with electrical tape. Keep
them away from any electrical or metal parts. 6. Reinstall the cover of the electrical control box.
WARNING
ISOLATE POWER SUPPLY LEADS AND COMMUNICATION LEADS BY THE STRAIN RELIEF AND KEEP POWER SUPPLY AWAY FROM
COMMUNICATION LEADS.

Step 3: 1. Match the wire colors/labels with the labels on the
terminal block. Firmly screw the u-lug of each wire to its corresponding terminal.

mrcool.com

32

8 ELECTRICAL CONNECTIONS

8.4 Indoor Unit Wiring

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.

Indoor Unit Wiring
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.
Step 3: Connect the wires to the terminals.
1. Thread the power cable and the signal cable through the wire outlet.
2. 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.

3. Clamp down the cable with the cable clamp. The cable must not be loose or pull on the u-lugs.
4. 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.
8.5 Specific Wiring Methods
WARNING
Refer to the wiring nameplate for the wiring method. Do not connect the power cord to the communication line, as this may damage the system.
Connection Method A:
Refer to the wiring method of internal and external machine communication and wired controller as follows:

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

33

mrcool.com

8 ELECTRICAL CONNECTIONS
Connection Method B:
The following wiring diagrams are suitable for the AHU and ODU with 24V thermostat. Non-communication scheme wiring reference
· Wiring for 4H and 2C thermostat

mrcool.com

34

8 ELECTRICAL CONNECTIONS

35

mrcool.com

8 ELECTRICAL CONNECTIONS

Optional Function Wiring:

Fault Warning:

Indoor and Outdoor Unit Communication interface
Condensate Overflow Switch:
The unit will accommodate a remote condensate overflow switch. To enable, remove jumper J1 and connect the installer-provided condensate overflow device to CN5 per below. When an overflow condition is present, the device should open 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.

mrcool.com

36

8 ELECTRICAL CONNECTIONS

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, and wire the humidistat and humidifier per above 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 an HUM interface, connect the humidifier directly to the HUM and C ports.
Dehumidification Control Wiring
Dehumidification control requires external Humidistat at DH and R. Set S4-2 as 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 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.

Control Logic
Indoor Unit Connector

Connector R C G Y1
Y/Y2 B W W1 W2
E/AUX DH/DS/BK
L

Purpose 24V Power Connection
Common Fan Control Low Cooling High Cooling Heating Reversing Valve Heating Control Stage 1 Electric Heating Stage 2 Electric Heating Emergency Heating Dehumidification/Zoning Control System Fault Signal

Outdoor Unit Connector

Connector R C Y1 Y2 B W D L

Purpose 24V Power Connection
Common Low Cooling High Cooling Heating Reversing Valve Heating Control Defrost Control System Fault Signal

LED Display
The control displays unit status as well as any active fault codes on the LED display. If the unit is functioning normally, the LED will display the current temperature setpoint. When a fault code is active, the display will quickly flash the active fault code. Refer to the fault code table located in the troubleshooting section of the manual for detailed fault code information.
KEY1 Instructions (For Wired Controller Only)
· Press KEY1 to enter the forced automatic mode. Press KEY1 again to enter the forced cooling mode (LED Display FC). Press KEY1 again to shut down.
· Keep pressing KEY1 under forced cooling mode (LED Display FC) for five seconds to enter forced defrost mode.

37

mrcool.com

8.6 DIP Switch Definitions

8 ELECTRICAL CONNECTIONS

mrcool.com

38

8 ELECTRICAL CONNECTIONS

Function DIP Switch Settings:
The 24V thermostat mode must refer to the following settings:

Function Combination Table of SW1-1 and SW1-4:

SW4-1 SW4-2 SW4-3

000 is the default 000/001/010/011/100 /101/110/111, internal machines with
different abilities, electric heating, and PSC classification for use.

Indoor Unit Dial Code

No.

Dial Code

Control Scenario

Function

ON

OFF

Note

1 SW1-2 1, 2, 3

Anti-cold blow protection option

NO

[Default] YES

2 SW1-3 1, 2, 3

Single cooling/heating and cooling options

Cooling

[Default] Cooling & Heating

3 SW2-1

1

4 SW2-1

2

Compressor Running (demand working with heat
pump+electric heat)
Temperature differential to activate first stage auxiliary heat (the GAP of T1 and Ts), Wire controller demand with
heat pump+electric heat working together

Compressor slower speed 2°F (1°C)

[Default] Faster Compressor [Default] 4°F (2°C)

Only affects compressor
and W1

5 SW2-2

2

Electric heat on delay

YES

[Default] NO

6 SW2-3

2

Electric auxiliary heating delay to start time

30 minutes

[Default] 15 minutes

Based on SW2-2 is ON.

7 SW2-4

1

Compressor

The operation of the heat pump is limited by the outdoor temperature, and the operation of auxiliary heat is not limited. The system makes judgments according to the following rules:

[Default] The operation of heat pump is limited by the outdoor temperature, and
the operation of auxiliary heat is not limited. The
system makes judgments based on the following rules:

1. The compressor can be operated when the outdoor temperature is S3 DIP switch temperature +35.6°F (2°C).

2. The compressor cannot be operated when the outdoor temperature is lower than
   the S3 DIP switch,

3. The compressor cannot be operated when the outdoor temperature is lower than the S3 DIP switch temperature.

4. The c compressor can be operated when the outdoor
   temperature is S3 DIP switch temperature +35.6°F
   (2°C).

SW2-4 and S3 need to be working together.

39

mrcool.com

8 ELECTRICAL CONNECTIONS

No. Dial Code
8 SW2-4

Control Scenario
2

Function
Compressor/Auxiliary heat outdoor ambient lockout

9 Rotary 1, 2 Switch S3

Set outdoor temperature limitation (for auxiliary heating or compressor)

ON

OFF

Note

The operation of heat pump is limited by the outdoor temperature, and the operation of auxiliary heat is not limited. The system makes judgments according to the following rules:

1. The compressor can be operated when the outdoor temperature is S3 DIP switch temperature +35.6°F (2°C).
2. The compressor cannot be operated when the outdoor temperature is lower than the S3 DIP switch temperature.
   Table A

[Default] Only one heat pump or auxiliary heat can be operated. The system makes judgment according to the following rules:

1. When the outdoor temperature is lower than the S3 DIP switch temperature, the compressor is not allowed to operate, but auxiliary heat is allowed to operate.
2. When the outdoor temperature is S3 DIP switch temperature +35.6°F (2°C), the compressor can be operated but auxiliary heat cannot be operated.

SW2-4 and S3 need to be working together.

10 SW3-1 1
11 SW3-2 1 12 SW3-3 1 13 SW3-3 2
14 SW3-4 1, 3 15 SW4 1, 2, 3 16 S4-1 1, 3 17 S4-2 1,3

Maximum continuous runtime allowed before system automatically stages up capacity to satisfy set point. This adds 1 to 5°F to the user set point to increase capacity and satisfy user set point.
Cooling and heating Y/Y2 temperature differential adjustment
Compressor running (demand working with heat pump+electric heat)
Temperature differential to activate second stage auxiliary heating (the GAP of T1 and Ts). Wire controller demand with heat pump+electric heat working together
Fan speed of cooling mode when 24V Thermostat is applied for
Electric heat nominal CFM adjustment
Default ON
DH function selection

30 minutes

[Default] 90 minutes

Compressor slower speed Compressor slower speed 4°F (2°C)

[Default[ Faster compressor [Default] Faster compressor [Default] 6°F (3°C)

Turbo

High

Available settings are 000/001/010/011. Each digit corresponds to an individual switch position. For example [SW4-1 OFF, SW4-2
ON, SW4-3 OFF] = 010; See table 11 for the corresponding CFM adjustment.

[Default] For single stage

For dual stage supplemental

supplemental heat, W1 and W2 heat, W1 and W2 are

are connected

controlled independently.

[Default] Dehumidification control not available

Dehumidification feature is enabled through the thermostat

Only affects compressor
Only affects compressor and W2

mrcool.com

40

8 ELECTRICAL CONNECTIONS

Address DIP Switch:

Determined by dial code S2 1-10K 2-5.1K

Address dialing S1+S2: When the user uses the centralized controller, the address dialing is required.

Network address: The address silkscreen is NET address, which is composed of a 16-bit address rotary code S2 plus a two-digit DIP switch S1 [Set during engineering installation,network function does not need to be set]

When S2 is 00 (the dialing code is not connected), the network address value is the value of S2;

When S2 is 10 (corresponding to the switch of the hardware connected to the 10K resistor), the network address value is S2 plus 32;

Determined by dial code S2 1-10K 2-5.1K When S2 is 01 (corresponding to the dial code of the 5.1K resistor connected to the hardware is turned on), the network address value is the value of S2 plus 16;

When S2 is 11 (all dialing codes are on), the network address value is the value of S2 plus 48.

41

mrcool.com

Air Volume Table

8 ELECTRICAL CONNECTIONS

mrcool.com

42

8 ELECTRICAL CONNECTIONS
Air Volume Table

The constant airflow volume motor is applied. Therefore, the airflow volume is constant at all ESP within the stated range.

43

mrcool.com

9-Specifications
Cooling and Heating Power Specifications

SPECIFICATIONS

NOTICE
Line Diameter Sizing per NFPA 70 (2020), Table 310.5 (B) (16) Based on type NM-B Romex wire. Other sizing options are possible. Consult NFPA 70 or Licensed Electrician for alternate sizing.

mrcool.com

44

AIR EVACUATION

10.1 Air Evacuation Preparation & Precautions

NOTICE
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to force the valve open further.

Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage the unit, reduce its efficiency, and cause injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit, removing any non-condensible gas and moisture from the system. Evacuation should be performed upon initial installation and when 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.
10.2 Evacuation Instructions
1. Connect the charge hose of the manifold gauge to 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, refer to the Gas Leak Check section for information on how to check for leaks. If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve).
9. Insert 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.

Outdoor Unit

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.

45

mrcool.com

11 ADDING REFRIGERANT

11-Adding Refrigerant

DO NOT mix refrigerant types.

CAUTION

Some systems require additional charging depending on pipe lengths. The standard pipe length varies according
to local regulations. For example, in North America, the standard pipe length is 7.5m (25′). In other areas, the standard pipe length is 5m (16`). 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:

mrcool.com

46

TEST RUN

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

12.1 Before Test Run

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.
12.2 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.
NOTICE
If the unit malfunctions or does not operate according to expectations, refer to the Troubleshooting section of the Service Manual before calling customer service.

47

mrcool.com

12.3 24V Signal Chart

12 TEST RUN

Note: 1: 24V signal 0: No 24V signal *: 1 or 0 The AUU will turn off if the 24V input cannot meet the table.

mrcool.com

48

Versa Pro Central Ducted
36K-60K
The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>