MrCool PRODIRECT Series Quick start guide

PRODIRECT™ SERIES
Split System Heat Pump & Air Conditioner
13 -14 SEER 1.5-5 Tons Model
HHP140* & HAC140*
Owner & Installation
Manual
Copyright © 2021 MRCOOL, LLC
Thank you for choosing MRCOOL. Please read this manual carefully before installation and keep it for future reference.
Due to updates and constantly improving performance, the information and instructions within this
manual are subject to change without notice. Please visit www.mrcool.com/documentation to
ensure you have the latest version of this manual.
Version Date: 6-25-21

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These instructions are intended as an aid for qualified
and licensed service personnel for proper installation,
adjustment, and operation of this unit. Read these
instructions thoroughly before attempting installation
or operation. Failure to follow these instructions may
result in improper installation, adjustment, service or
maintenance possibly resulting in fire, electrical shock,
property damage, personal injury or death.

Table of Contents
1 DIMENSIONS
2 SERVICE SPACE
3 PIPING DIAGRAMS
4 WIRING DIAGRAMS
5 ELECTRIC CHARACTERISTICS
6 OPERATION LIMITS
7 INSTALLATION PROCEDURE
8 LOCATION SELECTION
9 OUTDOOR UNIT INSTALLATION (TOP DISCHARGE UNIT)
10 REFRIGERANT PIPE INSTALLATION
11 VACUUM DRYING AND LEAKAGE CHECKING
12 ADDITIONAL REFRIGERANT CHARGE
13 PIPE INSULATION
14 ELECTRICAL WIRING INSTALLATION & REQUIREMENTS
15 TEST OPERATION
16 TROUBLESHOOTING
INSTALLATION AND OWNER’S MANUAL
2
3
4
6
7
8
9
10
11
13
15
16
17
18
20
21
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Fig. 1
Table - 1
21-3/4 [554] 21-3/4 [554]
21-3/4 [554] 21-3/4 [554]
21-3/4 [554] 21-3/4 [554]
1. Dimensions

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Fig. 2
2. Service Space

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Applicable for 18k, 24k, 30k, 36k cooling only type
Applicable for 18k, 24k, 30k, 36k cooling & heating type
Fig. 3-1
Fig. 3-2
3. Piping Diagrams

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Applicable for 42k, 48k, 60k cooling only type
Applicable for 42k, 48k, 60k cooling & heating type
Fig. 3-3
Fig. 3-4

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Applicable for 18k, 24k, 30k, 36k, 42k, 48k, 60k cooling only type
Applicable for 18k, 24k, 30k, 36k, 42k, 48k, 60k cooling & heating type
1. Grounded and all wiring to conform to I.E.C.
2. Replacement wire must be the same gauge and insulation type as original wire.
3. The units should install the stated-cross-section ground wire and keep it
grounding properly and reliably.
4. According to the actual connection of low-voltage switch or short wiring.
1. Grounded and all wiring to conform to I.E.C.
2. Replacement wire must be the same gauge and insulation type as original wire.
3. The units should install the stated-cross-section ground wire and keep it
grounding properly and reliably.
4. For indoor transformer, the current of 24V load voltage is not less than 1.5A.
Fig. 4-1
Fig. 4-2
4. Wiring Diagrams

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Table - 2
5. Electrical Characteristics

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Fig. 6
Table - 3
Range of
Operation
Range of
Operation
When the ambient temperature is more than 109°, the restart time may take 15-20 minutes. It is
suggested to install a booster in the outdoor unit (18K, 24K, 30K, and 36K units only) to shorten
the restart time. In the case of high and low pressure imbalance, a booster can increase the
starting torque of the compressor allowing it to start normally.
6. Operation Limits
(17°C~30°C) (17°C~30°C)
(18°C~43°C) (-7°C~24°C)

7. Installation Procedure
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Indoor Unit Installation
Location Selection
Outdoor Unit Installation
Location Selection
Indoor Unit Installation Outdoor Unit Installation
Refrigerant Pipe
Installation and Insulation
Refrigerant Pipe
Installation and Insulation
Drainage Pipe Installation
And Insulation
Drainage Pipe Installation
And Insulation
Vacuum Drying and Leakage Check
Additional Refrigerant Charge
Insulate the joint and connections of the refrigerant pipe
Wiring connection and electrical safety check
Test operation

8. Location Selection
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8.1 Indoor unit location selection
• The location should easily support the indoor unit's weight.
• The location is easily accessible for indoor unit installation and inspection.
• The location can accommodate horizontal indoor unit installation.
• The location allows easy water drainage.
• The location allows the unit to easily connect with the outdoor unit.
• The location offers sufficient air circulation in the room.
• There should not be any heat source or steam near the unit.
• There should not be any oil or gas near the unit.
• There should not be any corrosive materials near the unit.
• There should not be any salty air near the unit.
• There should not be strong electromagnetic waves near the unit.
• There should not be inflammable materials near the unit.
• There should not be any strong voltage vibration.
8.2 Outdoor unit location selection
• The location should easily support the outdoor unit's weight.
• The location should put the outdoor unit as close to the indoor unit as possible.
• The piping length and height drop can not exceed the allowable value (Reference Table 4).
• Select a location where any noise, vibration, or outlet air will not disturb the residents of
surrounding homes.
• There is enough room for installation and maintenance.
• The air outlet and the air inlet are not impeded, and do not face any sort of strong wind.
• Select a location where pipes and cables will be easy to install.
• There is no danger of fire from potential leakage of inflammable gas.
• The location should be a dry and well ventilated space.
• The location and support should allow the unit to sit flat and horizontal.
• Do not install the outdoor unit in a dirty or severely polluted place, in order to avoid any blockage of
the heat exchanger contained within the outdoor unit.
• If a protective structure is built over the unit to prevent direct sunlight, rain exposure, direct strong
wind, snow, or the accumulation of other types of debris, make sure the heat that radiates from the
condenser is not restricted.
Fig 8-1

9. Outdoor Unit Installation (Top Discharge Unit)
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Location selection
Before starting the installation, find and select a suitable location for both the indoor and outdoor unit
using the guidelines listed previously. Observe all limitations and clearance requirements. The outdoor unit
must have sufficient clearance for air to enter and discharge from the condenser coil, as well as for service
access.
Note: For multiple unit installations, units must be spaced a minimum of 18 in (457 mm) apart. (Coil
face to coil face.) If the unit is to be installed on a roof or a black-topped ground area where it will
be exposed to the heat of the sun, the unit should be raised sufficiently above the roof or ground
to avoid the unit from taking in the accumulated heat of those surfaces. Provide adequate struc-
tural support.
Service space for outdoor unit
Install the Unit
The unit may be installed at ground level on a solid base that will not shift or settle, as unnecessary
movement could cause strain on the refrigerant lines and possible leaks to occur. Maintain the
clearances shown in Fig.9-2 and install the unit in a level position. Normal operating sound levels
may be undesirable if the unit is placed directly under windows of certain rooms (bedrooms, study,
etc.). The top of unit discharge area must be unrestricted for a minimum 6 feet above the unit.
Fig 9-1
Fig 9-2

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Warning: The outdoor unit should not be installed in an area where excessive mud or ice could
accumulate, as this could cause personal injury. Elevate the unit sufficiently to prevent any blockage to the
air entrances from excessive snow or precipitation. Check the local weather bureau for average snow
accumulation in the area. Be sure to Isolate the unit from rain gutters to avoid the foundation from
possible being washed out.
Roof installation
When installing units on a roof, the structure must be capable of supporting the total weight of the unit.
This also includes any framing of the unit, rails, etc., which should be used to minimize the transmission of
sound or vibration into the conditioned space.

10. Refrigerant Pipe Installation
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Maximum pipe length and height drop
Consider the allowable pipe length and height drop when deciding the installation position. Make sure the
distance and height drop between the indoor and outdoor units do not exceed the data in the following
table.
CAUTION: Dry nitrogen should always be flowing through the tubing while it is being
brazed, because the temperature required is high enough to cause oxidation of the
copper unless an inert atmosphere is provided. The flow of dry nitrogen should
continue until the joint has cooled. Always use a pressure regulator and safety valve to
ensure that only low pressure dry nitrogen is introduced into the tubing. Only a small
amount of flow is necessary to displace air and prevent oxidation.
Fig.10-1
Table - 4
Ft. (M) Ft. (M)
The procedure of connecting pipes
1. Choose the pipe size according to Table 4 above.
2. Confirm the cross way of the pipes.
3. Measure the necessary pipe length.
4. Cut the selected pipe with pipe cutter making the
section flat and smooth. Refer to Fig. 10-1
5. Insulate the copper pipe.
6. Before test operation, the joint parts should not
be heat insulated.
7. Drill holes if the pipes need to pass through the wall.
8. Bend the pipes if necessary to pass through the wall smoothly.
9. Bind and wrap the wires together with insulated pipe if necessary.
10. Set the wall conduit.
11. Set the support for the pipe.
12. Locate the pipe and secure to support bracket.
•For horizontal refrigerant pipe, the distance between supports should not exceed 3.28 ft (1m).
•For vertical refrigerant pipe, the distance between supports should not exceed 4.92 ft (1.5 m).
13. Connect the pipe to indoor unit and outdoor unit by brazing (Top discharge outdoor unit
and
Air Handler indoor units).
•Top discharge outdoor unit and air handler indoor units connections are copper-to-copper
and should be brazed with a phosphorous-copper alloy material, such as Silfos -5 or equivalent.
DO NOT use soft solder. The outdoor units have reusable service valves on both the liquid and
gas connections. The total system refrigerant charge is retained within the outdoor unit during
shipping and installation. The reusable service valves are provided to evacuate and charge per
this instruction.
•Serious service problems can be avoided by taking adequate precautions to ensure an
internally clean and dry system.

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• Precautions should be taken to prevent heat damage to the service valve by wrapping a wet rag
around it, as shown in the image below. Also, protect all painted surfaces and insulation during
brazing. After brazing, cool the joint with a wet rag.
•The valve can be opened by removing the plunger cap, and then fully insert a hex wrench into the
stem turning counter-clockwise until the valve stem just touches the chamfered retaining wall.
Fig. 10-2

11. Vacuum Drying and Leakage Checking
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Purpose of vacuum drying
• Eliminating moisture in the system to prevent the phenomena of ice-blockage and copper oxidation.
Ice-blockage can cause abnormal operation of system, while copper oxide can damage the compressor.
• Eliminating the non-condensable gas (air) in the system to prevent the components from oxidizing,
pressure fluctuation, or bad heat exchange during the operation of system.
Selection of vacuum pump
•The vacuuming capability of the vacuum pump should be 756 mmHg or above.
•Precision of vacuum pump should reach 0.02 mmHg or above.
Operation procedure for vacuum drying
There are two kinds of vacuum drying that can be used depending on the environment, when the unit is
installed. These are ordinary vacuum drying and special vacuum drying. These consist of the following:
Ordinary vacuum drying
1. When conducting the first vacuum drying, connect pressure gauge to the infusing mouth of the gas pipe
and liquid pipe, and keep vacuum pump running for an hour (the degree of vacuum the pump should
reach is, -755mmHg).
2. If the vacuum pump can not reach -755 mmHg after 1 hour of drying, it indicates that there is moisture
or leakage in the pipeline system and will need to continue drying for half an hour.
3. If the vacuum pump still can not reach -755 mmHg after 1.5 hours of drying, check for leaks.
4. Leakage test: After the vacuum reaches -755 mmHg, stop vacuum drying and keep the system
pressurized for 1 hour. If the indicator of the vacuum gauge increases, this is an indication that there is still
moisture or a leak present.
Special vacuum drying
The special vacuum drying method should be used when:
1. Moisture is found while flushing the refrigerant pipe.
2. Installation is being conducted on a rainy day, because rain water could penetrate into the pipeline.
3. Install period is taking an extended amount of time, rain water or moisture could penetrate into the
pipeline.
NOTE: Be sure to use a micron gauge during vacuuming that can hold under 800 microns. Pull down
to 500 microns.

After the vacuum drying process is carried out, the additional refrigerant charge process needs to be
performed. The outdoor unit is factory charged with refrigerant. The additional refrigerant charge volume is
decided by the diameter and length of the liquid pipe between the indoor and outdoor unit. Refer to the
following formula to calculate the charge volume.
V=Additional refrigerant charge volume (oz).
L=The length of the liquid pipe (ft).
• Refrigerant may only be charged after the vacuum drying process is performed.
• Always use gloves and glasses to protect your hands and eyes during the charging process.
• Use an electronic scale, or a fluid infusion apparatus, to properly weigh refrigerant to be recharged. Be
sure to avoid over-charging the system with refrigerant, as it could cause a leak, damage to the compressor,
or result in personal injury.
• Use supplemental flexible pipe to connect the refrigerant cylinder, pressure gauge, and outdoor unit. The
refrigerant should only be charged in a liquid state.
• After the refrigerant recharging process, check for refrigerant leaks at the connection joint. (By using either
a gas leakage detector or soapy water to detect).
12. Additional Refrigerant Charge
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Table - 5
NOTE: There are two ways to verify the correct refrigerant charge. The most commonly
used method is to adjust the refrigerant charge based on the subcooling range. The second
method is rarely used, but it is being included for reference only. Multiply the length of the
liquid pipe and the empirical coefficient (the coefficient is determined by the pipe diameter)
to verify the correct charge.

13. Pipe Insulation
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Insulation of refrigerant pipe
Operational procedure of refrigerant pipe insulation
1. Cut the suitable pipe
2. Insulation (except joint section)
3. Flare the pipe
4. Piping layout and connection
5. Vacuum drying
6. Insulate the joint parts
Purpose of refrigerant pipe insulation
• During operation, the temperature of gas pipe and liquid pipe could be extremely hot or cold. Therefore, it
is necessary to insulate them; otherwise it can affect the performance of the unit and damage the
compressor.
• Gas pipe temperature is very low during cooling. If insulation is insufficient, condensation can form and cause
leakage.
• Temperature of gas pipe is very high, generally 122°F-212°F (50°C-100°C) during heating. Insulation must
be used to prevent injury.
Insulation material selection for refrigerant pipe
• Should be able to withstand temperatures of above 248°F (120°C)
• Insulation should be made of a material that meets the standards of local laws and regulations
• The thickness of insulation layer should be above 10 mm. If in a hot or wet environment, the layer of
insulation should be thicker.
Installation of insulation
NOTE Gas pipe and liquid pipe should be insulated separately. If the gas pipe and liquid pipe are
insulated together, it will decrease the performance of air conditioner.
• The insulation material at the joint pipe should be
5-10 cm longer than the gap of the insulation
material.
• The insulation material at the pipe joint should be
inserted into the gap of the insulation material.
• The insulation material at the pipe joint should be
wrapped to the gas pipe and liquid pipe tightly.
• The linking part should use glue to paste together
• Be sure to not wrap the insulation material too
tightly, as it may force out air in the material and
cause the insulation to be less effective, and
lessen its durability.
Insulation of drainage pipe
Operational procedure of refrigerant pipe insulation
• Select the suitable pipe
• Insulation (except joint section)
• Piping layout and connection
• Drainage test
• Insulate the joint parts
Purpose of drainage pipe insulation
The temperature of condensate drainage water is very low. However, if insulation is insufficient, it could
cause condensate to form and cause leakage which could lead to property damage.
Fig. 13

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Insulation material selection for drainage pipe
• The insulation material should be flame retardant and in accordance to the guidelines of local law.
• Thickness of insulation layer is usually above 10 mm.
• Use specific glue to paste the seam of insulation material, and then bind with adhesive tape. The width of
tape should not be less than 5 cm. Make sure it is firm and avoid condensation.
Installation of insulation
The single pipe should be insulated before connecting to another pipe, the joint should be insulated after
the drainage test.
There should be no insulation gap between the insulation material.
14. Electrical Wiring Installation & Requirements
Highlights of electrical wiring installation
• All field wiring construction should be performed by a qualified electrician.
• Air conditioning equipment should be grounded according to the local electrical regulations.
• Current leakage protection switch should be installed.
• Do not connect the power wire to the terminal of signal wire.
• When power wire is parallel with signal wire, put each wire in their own wire tube and make sure there is
at least a 12 in (300 mm) gap between them.
•Using the following tables to select the proper wire guage.
• Select different colors for different wire according to relevant regulations.
• Do not use metal wire tube where it could be exposed to acid or alkali corrosion. Use plastic wire tube to
replace it.
• There must not be wire connect joints in the wire tube. If a joint is a must, set a connection box at the
place.
• Wiring of varying voltage should not be in one wire tube.
• Ensure that the color of the wires of the outdoor unit and the terminal No. are same as those of indoor
unit respectively.
Electric Wiring Guage
Table - 6