Please read this manual carefully before installation and keep it for future reference.
Owner & Installation
Manual
®
DIY
Please read this manual carefully before installation and keep it for future reference.
E Star
™
Series
Contents
Safety Precautions
!
Warnings ................................................................................................................................. 3
Cautions .................................................................................................................................. 4
Parts Overview
1
Parts Diagram ........................................................................................................................ 5
Display Window ..................................................................................................................... 6
Accessories ............................................................................................................................. 7
Operating Instructions
2
Operating Temperature ......................................................................................................... 9
Manual Operation .................................................................................................................. 9
Airflow Directional Control .................................................................................................... 10
How the A/C & Heat Pump Work .......................................................................................... 11
Special Functions .................................................................................................................... 12
Care and Maintenance
3
Before Maintenance .............................................................................................................. 13
Cleaning the Unit ................................................................................................................... 13
Cleaning the Air Filter(s) ........................................................................................................ 13
Preparation for Extended Non-Operation .......................................................................... 14
Pre-Season Inspection ........................................................................................................... 14
Page 1 mrcool.com
Contents
4
Indoor Unit Installation ...........15
1. Installation location................................15
2. Attach mounting plate to wall...............16
3. Drill wall hole for connective piping.....16
4. Prepare refrigerant piping ....................18
5. Connect refrigerant piping ....................19
6. Connect drain hose.................................21
7. Wrap piping and cables..........................22
8. Mount indoor unit..................................22
5
Outdoor Unit Installation ......
1. Installation location ............................23
2. Install drain joint .................................24
3. Anchor outdoor unit .......................... 25
6
Refrigerant Piping Connections......................27
7
Electrical Connections .....................................31
Electrical and Gas Leak Checks.......................33
8
9
Test Run.............................................................34
23
10
Troubleshooting................................................36
11
EU Disposal Guidelines.....................................39
mrcool.com
Page 2
Safety Precautions
Safety Precautions
!
Read Before Using
Incorrect usage may cause serious damage or injury.
The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.
This symbol indicates ignoring instructions may cause death or serious injury.
WARNING
This symbol indicates that ignoring instructions may cause moderate injury
to your person, damage to your unit, or other property.
CAUTION
This symbol indicates that you should NEVER perform the indicated action.
WARNING
DO NOT share the electrical circuit with other appliances. Improper or insufficient power supply
can cause fire or electrical shock.
When connecting refrigerant piping,
enter the unit. The presence of other gases or substances will lower the unit’s capacity, and may
cause abnormally high pressure in the operation cycle. This may cause explosion and injury.
DO NOT allow children to play with the air conditioner. Children should be supervised around the
unit at all times.
1. Installation must be performed according to installation instructions. Improper installation may
cause water leakage, electrical shock, fire, or may void the warranty.
2. In North America, service or repair must be performed in accordance with the requirement of
NEC and CEC (by authorized personnel or authority having jurisdiction only.) Contact an
authorized service technician for repair or maintenance of the unit.
3. Only use the included accessories and specified parts for installation. Using non-standard parts
can cause water leakage, electrical shock, or fire and may cause the unit to fail.
4. Install the unit in a firm location that can support the unit’s weight. If the installation location
cannot support the weight, or the installation is performed improperly, the unit may fall and
cause serious injury and/or damage.
DO NOT let substances or gases other than the refrigerant
5. For all electrical work, follow all appropriate wiring standards, regulations, and the Installation
Manual.
6. You must use an independent circuit to supply power. Do not connect other appliances to the
same circuit. Insufficient electrical capacity or defects in electrical work can cause electrical
shock or fire.
Page 3
mrcool.com
Safety Precautions
7. 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 may overheat, causing fire and/or electrical
shock.
8. All wiring must be properly arranged to ensure that the control board cover can close properly. If the
control board cover is not closed properly, it can lead to corrosion and cause the connection points on
the terminal to overheat , causing fire and/or electrical shock. If connecting power to fixed wiring, an
all-pole disconnection device which has at least 3mm clearances in all poles, and have a leakage current
that may exceed 10mA, the residual current device (RCD) having a rated residual operating current not
exceeding 30mA, and disconnection must be incorporated in the fixed wiring in accordance with the
wiring rules.
9. In certain functional environments, such as kitchens, server rooms, etc., the use of specially designed
air-conditioning units is highly recommended. If the supply cord is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
10. This appliance can be used by children aged 8 years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards
involved. Children should not play with the appliance. Cleaning and user maintenance should not be
made by children without supervision.
For units that have an auxiliary electric heater, DO NOT install the unit within 3 feet (1 meter) of
combustible materials.
.
DO NOT install the unit in a location that may be exposed to combustible gases. If combustible gas
accumulates around the unit, it may cause fire.
DO NOT operate your air conditioner in a wet room such as a bathroom or laundry room. Too
much exposure to water may cause electrical components to short circuit.
DO NOT operate the air conditioner with wet hands. This may cause electrical shock.
DO NOT climb onto or place objects on top of the outdoor unit.
1. The product must be properly grounded during installation, or electrical shock may occur.
2. Install drainage piping according to the instructions in this manual. Improper drainage may cause
water damage to your home and property.
Note about Flourinated Gasses:
1. This air-conditioning unit contains flourinated 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 uninstallation and recycling must be performed by a certified technician.
5. If the system has a leak-detection system installed, it should be checked for leaks at least every
12 months.
6. Keep a record of all leak checks for the lifetime of the unit.
mrcool.com
Page 4
Parts Overview
Safety Precautions
1
Indoor Unit
(Interior / Air Handler)
Front Panel
(with display)
Air Filter
Vertical Airflow Louver
Horizontal Airflow Grill (inside)
(on back of main filter in Specified Units)
Air inlet (rear)
Air outlet (bottom)
Fresh Air Filter
Indoor temperature sensor
Electrical Access
Forced cooling button
Smart Controller
Module USB Port
Wall Mounting Plate
Drainage Pipe
Refrigerant Piping
Signal Cable
Remote Control
Air inlet (side)
Air outlet
Outdoor Unit
(Exterior / Condenser)
NOTE ON ILLUSTRATIONS
Air inlet (rear)
Electrical
Access
Remote Holder
Outdoor Unit
Power Cable
(to house)
Refrigerant Pipe Connection
and Stop Valve (under cover)
Signal Cable
Connection from
Indoor Unit
Fig. 1.1
Illustrations in this manual are for explanatory purposes. The actual shape of your unit may vary.
Page 5
mrcool.com
Overview - Display
1
2
°
ECO
3
4
Fig. 1.2
Display (on front panel of indoor unit) see fig. 1.2
1. Digital Display:
Displays the Temperature Setting when the air conditioner is operational.
Displays the Room Temperature when in FAN mode.
Displays the self-diagnostic codes.
Displays “ON” for three seconds when the Timer is ON and/or Fresh, Swing, Turbo or Silence
feature is activated.
Displays “OF” for three seconds when the Timer is switched OFF.
Displays “OF” for three seconds when the Fresh, Swing, Turbo or Silence feature is canceled.
Displays “dF” when Defrosting operation is active.
Displays “cF” when Anti-Cold Air feature is active in HEAT mode (when air temp is low).
Displays “SC” during Self Clean operation (if feature is available).
Displays “FP” when Freeze Protection is active, operating under 46.4 °F (8 °C) (if feature is
available).
2. Units of Measurement:
Displays “°C” for Celsius or “°F” for Fahrenheit. Default units are “°F” (Fahrenheit) and can be
switched by simultaneously pressing and holding both the up and down buttons on the remote
control.
According to the operation mode (heat / cool, etc.), the Units of Measurement will display in
different colors;
· Under Cool or Dry mode, it always displays as cool colors.
· Under Heat mode, it always displays as a warm color.
3. Wireless Mode:
Displays when the wireless control feature is activated.
NOTE: A guide for using the infrared remote - “Remote Manual” - is included in this literature
package.
4. Energy Saving Mode:
Displays when Energy Saving Feature is active. Not available when the unit does not have Energy
Saving Mode
mrcool.com
Page 6
Accessories
The air conditioning system includes the following accessories. Use all of the
installation parts and accessories to install the air conditioner. Improper installation may
result in water leakage, electrical shock, fire, or equipment failure.
PART LOOKS LIKE... QUANTITY
Mounting plate
Anchor
Mounting plate
fixing screw
Remote control
Fixing screw for remote
controller holder
ST2.9 x 10
Remote control holder
1
5
5
1
2
Optional
Parts
1
Dry battery AAA.LR03
Air freshening filter
Seal
Allen wrench
Drain joint
Neoprene
Note: Illustrations are for explanatory purposes only - The actual shape may vary.
2
1
1
1
1
(Only for use
when elevated)
1
(Sealant for Wall Sleeve)
Page 7
mrcool.com
Accessories
PART LOOKS LIKE... QUANTITY
Please read this manual carefully before installation and keep it for future reference.
Owner’s Manual
Owner & Installation
Manual
Remote Control
Manual
Smart Controller Kit
Sound deadening
pads
E-Star™ DIY Series
For more details visit www.MrCool.com
Please read this manual carefully before installation and keep it for future reference.
Remote Control
User Manual
For more details visit www.MrCool.com
1
1
1
(w/ Manual in
Controller Box)
2
Quick Connect®
line set
(refrigerant pipe)
Insulation material
Tape
1
2
(Apply to the quick
connectors of the pipe)
4
Page 8mrcool.com
Safety Precautions
Operating Instructions
Cooling Operation Heating Operation Drying Operation
2
Room Temperature
Outdoor
Temperature
NOTE:
1. Optimum performance will be achieved within these operating temperatures. If air conditioner
is used outside of the above conditions, certain safety protection features might come into
operation and cause the unit to function abnormally.
2. If the air conditioner runs for a long time in cooling mode and the humidity is high (over 80%),
condensed water may drip out of the unit. In this case, set the vertical air flow louver to its
maximum angle (vertical toward the floor), and set it to HIGH fan mode.
Manual Operation
Units are equipped with a switch to run emergency operation mode. It can be accessed by opening the
front panel. This switch is used for manual operation in case the remote fails to work or maintenance
is necessary.
(17°C~32°C)
63°F~90°F
(0°C~50°C)
32°F~122°F
5°F~122°F / -15°C~50°C
(For the models with low
ambient cooling system)
(0°C~30°C)
32°F~86°F
(-15°C~24°C)
5°F~75°F
(10°C~32°C)
50°F~90°F
(0°C~50°C)
32°F~122°F
NOTE:
control button. If the unit is operational, continue pressing the
manual control button until the unit is off.
1.
2.
3.
The unit must be turned off before operating the manual
Open and lift the front panel up to an angle until it remains
fixed with a clicking sound.
One press of the manual control switch will lead to the forced
AUTO operation. If the switch is pressed twice within five
seconds, the unit will operate under forced COOL operation.
Close the panel firmly to its original position.
CAUTION
• This switch is used for testing purposes only.
Please do not use it unless necessary.
•To restore the remote control operation,
use the remote control directly.
Manual
Control
Button
(Forced cooling)
Fig 2 .1
Page 9
mrcool.com
Operating Instructions
Airflow Directional Control
Adjust the airflow direction properly.
·
Otherwise, it might cause discomfort or
uneven room temperatures.
· Adjust the vertical louver using the remote.
· Adjust the horizontal louver manually.
Vertical
Louver
Range
fig 2.2
Adjust Vertical (Up / Down) Air Flow using Vertical
Louver (fig2.2):
Perform this function while the unit is in operation. Use
the remote control to adjust the Vertical Louver /
Vertical Air Flow direction. The vertical louver can move
in small increments for each press, or continuously
swing up and down automatically. Please refer to the
“REMOTE CONTROL USER MANUAL” for details.
Adjust Horizontal (Left/ Right) Airflow using
Horizontal Louver (fig 2.3, fig 2.4):
Move the Deflector Rod manually to adjust the air flow
side to side (left / right) as desired.
CAUTION
DO NOT Do not put your fingers into the panel of
the blower and suction side. The high speed fan
inside may cause injury.
DO NOT operate the unit for long periods of time
with the airflow direction set downward in
cooling or dehumidifying mode. Otherwise,
condensation might occur on the surface of the
vertical louver causing moisture to drop on to
the floor or furnishings .
Deflector Rod
Horizontal Louver
(Horizontal Airflow
Grill inside)
fig 2.3
Range
fig 2.4
DO NOT move the vertical louver manually.
Otherwise, the vertical louver will be out of sync.
IF this happens, cease operation, turn off power
to the unit, remove the wireless module from the
front cover, turn off power to the circuit (at the
breaker), wait for a few seconds and turn power
back on at the breaker, reinstall wireless module
and power the unit back on.
After a quick restart, the vertical louver may
1.
remain static for approximately 10 seconds.
2.
Open angle of the vertical louver should not be
set too small, as it will restrict airflow and reduce
COOLING and HEATING performance.
mrcool.com
Page 10
Operating Instructions
How the air conditioner works
SLEEP operation
Set
Temperature
1 hour
Cooling
SLEEP operation
1 hour
8 hours
timer OFF
8 hours
timer OFF
Basic Operation Modes:
AUTO / COOL / DRY / HEAT (Model dependent).
Auto Operation:
When you set the air conditioner in AUTO mode, it will
automatically select cooling, heating or fan-only operation
depending on set temperature and room temperature.
The unit will control the room temperature automatically,
according to the temperature point you set.
SLEEP Operation:
When selected, the temperature will increase while cooling
or decrease while heating by 1°C / 2°F per hour for the first
2 hours. Thereafter it keeps this new temperature for 6
hours before SLEEP mode switches off.
DRYING Operation:
The temperature is regulated while dehumidifying by
intermittently switching the cooling or fan-only operation on
and off. The fan speed is set to LOW.
Set
Temperature
1 hour
Heating
1 hour
Closing the
curtains while
heating also
helps keep the
heat in
Doors and
windows should
be kept closed
HEATING Operation:
This unit is a heat pump by design. By reversing the air
conditioning process, it absorbs heat from outdoors and
transfers it to the indoor unit. As a result, the operating
performance and efficiency is reduced as the outdoor air
temperature drops. If you feel that the heating
performance is insufficient, it is recommended that you
supplement heating with other appliances.
Optimal Operation:
To achieve optimal performance, please note the following:
· Adjust the airflow direction correctly, so that it is not
towards people or at an extreme angle.
· Adjust the temperature to achieve moderate comfort
levels. An excessively low or high temperature setting
wastes energy.
· Keep windows and doors closed, as this improves
performance.
· Limit energy usage (run time) by using the TIMER
function.
· Do not put any objects near the air inlets / outlets. Doing
so would impair performance and possible shut down
the unit.
Page 11
· Inspect the air filters periodically, and clean them as
needed.
mrcool.com
Operating Instructions
Special Functions
Refrigerant Leakage Detection (optional):
When refrigerant leakage is detected, the indoor unit will display “EC” or “ELOC” code or flash LEDs,
depending on the model.
Louver Angle Memory Function (optional):
Within the scope of the safe operation angle, the horizontal louver angle is memorized and returns to
the position last selected by the user. If it exceeds the safe operation angle, it will default within the
safe operation range. However, it will not return to safe operation angle when Turbo mode is set or
the unit is in manual control or after a power interruption. Subsequently, it is strongly recommended
that the horizontal louver angle not be set too small, to avoid possible condensation leakage.
Anti-Mildew Function (optional):
When the unit is turned off, in COOL, DRY, AUTO (cool) modes, it will continue to run for about 10
minutes with a low fan airflow. This aids in drying up any condensation inside the unit to prevent
mildew growth. Do not restart the air conditioner until the unit is completely off.
Optimal Operation:
In the event of a power interruption such as a blackout, the air conditioner will stop. It will then
restart automatically and resume the previous operation when the power supply returns.
Wireless Smart Control Function:
Connect the wireless control module via the USB port in the back of the front cover of the indoor unit
for the unit to be controlled by remote control and/or smartphone app.
Clean Air Filter Reminder (optional):
After 240 hours of operation, the indoor display window will display and flash “CL” as a reminder to
CLEAN the air filter for more efficient operation. After 15 seconds, the system will revert back to the
previous display again. When the “CL” indicator appears and flashes, please press the LED button on
the remote control 4 times or press the manual control button 3 times to reset the hours. If you don’t
reset the reminder, the “CL” indicator will flash again when you restart the unit.
Replace Air Filter Reminder (optional):
After 2880 hours of operation, the indoor display window will display and flash “nF” as a reminder to
REPLACE the air filter for more efficient operation. After 15 seconds, the system will revert back to
the previous display again. When the “CL” indicator appears and flashes, please press the LED button
on the remote control 4 times or press the manual control button 3 times to reset the hours. If you
don’t reset the reminder, the “nF” indicator will flash again when you restart the unit.
Mute Function (optional):
Press the LED button on the remote to turn off the LED display and silence the buzzer of the indoor
unit, creating a quiet comfortable environment.
mrcool.com
Page 12
Operating Instructions
Care and Maintenance
CAUTION
3
Power supply must be disconnected before attempting
to clean or service. Failure to do so can cause electrical
shock.
DO NOT use benzene, thinner, polishing powder, or
similar solvents for cleaning. These may cause the
plastic to crack and/or deform.
DO NOT clean the unit with excessive amounts of water.
DO NOT touch the metal parts of the unit when
removing the filter. Injuries can occur when
handling the sharp metal edges.
DO NOT use water to clean inside the air
conditioner. Exposure to water can destroy the
insulation, leading to possible electric shock.
1
Cleaning the Unit:
Wipe the unit with a soft dry cloth. If the unit is very dirty, wipe it
with a cloth soaked in warm water. DO NOT use bleach or abrasives.
DO NOT use a chemically treated cloth or duster to
clean the unit.
DO NOT touch air freshening (Plasma) filter for at least
10 minutes after turning off the unit.
DO NOT clean the unit with combustible cleaning
agents. These could cause fire or defomation.
DO NOT wash air filter with water hotter than 40°C /
104°F.
DO NOT expose the filter directly to the sun, it may
shrink. Dry it in the shade.
Before performing maintenance, turn the power off to
the unit. Then, disconnect the power to the circuit at the
bre aker.
2
Page 13
FilterTab
Cleaning the Air Filter and Air Freshener:
A clogged air filter can greatly reduce the heating and cooling
efficiency of this unit. It is recommended to clean the unit every 2
weeks.
1. Open the front panel by carefully lifting both ends at the same
time. At a certain angle, there will be an audible click and the lid
becomes self-supporting. For some models, suspension bars are
provided and required to prop up the lid.
2. Use the filter tabs to lift the filter slightly upward and then toward
you.
mrcool.com
Care and Maintenance
3. Then, extract the filter by gently drawing it
downward. Replace as necessary.
4. Unclip the small air freshening filter from the larger
air filter. Replace as necessary. Otherwise, clean it
with a vacuum and clip it back into place after
cleaning the larger air filter as outlined in step 5.
5. Clean the large air filter with warm, soapy water. Be
sure to use a mild detergent. Rinse with fresh water.
Shake off excess water and dry in a cool area.
6. Re-clip air freshening filter into large air filter.
7. Re-fit air filter back into the unit by reversing steps 2
and 3 - gently pushing top up into the unit and then
lowering the bottom into place.
8. Close the front panel. Make sure that buckles fully fit
and the panel is completely closed.
Preparation for Extended non-Operation:
If you plan to not run the unit for a long period of time
(e.g. from the end of summer to the beginning of the
following summer), perform the following:
3
4
Air Freshening Filter
1. Clean the indoor unit and filters as previously
outlined.
2. Operate the unit in FAN only mode for at least 8
hours to dry out the inside of the unit.
3. Turn off the unit. Turn off power to the circuit at the
breaker. The unit should be the only appliance on
the circuit.
4. Remove the batteries from the remote control.
5. The outdoor unit requires periodic maintenance as
well. However, do not attempt this on your own. It
is highly recommended that you contact a qualified
service professional.
Pre-Season Inspection:
After prolonged non-operation perform the following:
1. Check for Damaged or Disconnected Wires.
2. Clean the Indoor Unit and Filters
3. Check for Water and Oil Leaks
Panel buckles
4. Check for Blockages in Airflow Inlet and Outlet
5. Replace Batteries
mrcool.com
Page 14
Installation Summary - Indoor Unit
Indoor Unit Installation
4
Installation Instructions
– Indoor Unit
PRIOR TO INSTALLATION:
Before installing the indoor unit, refer to the
label on the product box to make sure that
the model number of the indoor unit matches
the model number of the outdoor unit.
Step 1: Select installation location
Before installing the indoor unit, you must
choose an appropriate location. The following
standards will help you choose an appropriate
location for the unit.
Proper installation locations meet the
following standards:
Good air circulation
Convenient drainage
Noise from the unit will not disturb
other people
Firm and solid—the location will not vibrate
Strong enough to support the weight of
the unit
A location at least one meter from all other
electrical devices (e.g., TV, radio, computer)
DO NOT install unit in the following locations:
Near any source of heat, steam, or
combustible gas
Near flammable items such as curtains
or clothing
Near any obstacle that might block air
circulation
Near a doorway or where outside air may blow
directly on indoor unit
In a location subject to direct sunlight
NOTE ABOUT WALL HOLE:
If there is no fixed refrigerant piping:
While choosing a location, be aware that
you should leave ample room for a wall
hole (see Drill wall hole for connective
piping step) for the signal cable and
refrigerant piping that connect the indoor
and outdoor units. The default position
for all piping is the right side of the indoor
unit (while facing the unit). However, the
unit can accommodate piping to left or
right. After piping and signal wiring are
installed, use provided neoprene to pack
the space making it airtight.
Page 15 mrcool.com
Indoor Unit Installation
Refer to the following diagram to ensure proper distance from walls and ceiling:
Minimum Ceiling
Clearance is
15cm (5.9in)
>12cm
(4.75in)
For Ceilings GREATER
Than 9 Foot, Suggested
Floor Clearance is
230cm(90.55in)
For Ceilings LESS
Than 9 Foot, Suggested
Floor Clearance is
200cm(78.55in)
Step 2: Attach mounting plate to wall
The mounting plate is the device on which you will
mount the indoor unit.
1. Remove the screw that attaches the mounting
plate to the back of the indoor unit.
2. Place the mounting plate against the wall in a
location that meets the standards in the
Select Installation Location step. See
Mounting Plate Dimensions for detailed
information on mounting plate sizes.
3. Drill holes for mounting screws in places that:
• have studs and can support the weight of
the unit
• correspond to screw holes in the mounting
plate
>12cm
(4.75in)
Fig. 4.1
Step 3: Drill wall hole for connective piping
You must drill a hole in the wall for refrigerant piping,
the drainage pipe, and the signal cable that will
connect the indoor and outdoor units.
1. Determine the location of the wall hole based on
the position of the mounting plate. Refer to
Mounting Plate Dimensions on the next page
to help you determine the optimal position. Refer
to Fig. 4.3 wall hole diameter and install at a slight
angle to facilitate drainage.
2. Using a core drill [3.54in (76.2mm)], drill a hole in the
wall. Make sure that the hole is drilled at a slight
downward angle, so that the outdoor end of the
hole is lower than the indoor end by about 0.2 to
0.275in (5mm-7mm). This will ensure proper
water drainage. (See Fig. 4.2)
4. Secure the mounting plate to the wall with the
screws provided.
5. Make sure that mounting plate is flat against
the wall.
NOTE FOR CONCRETE OR BRICK WALLS:
If the wall is made of brick, concrete, or similar
material, drill 0.2in-diameter (5mm-diameter)
holes in the wall and insert the sleeve anchors
provided. Secure the mounting plate to the
wall by tightening the screws directly into the
clip anchors.
3. Place the protective wall cuff in the hole. This
protects the edges of the hole and will help seal
it when you finish the installation process.
CAUTION
When drilling the wall hole, be sure to avoid
wires, plumbing, nails, screws, and other
sensitive components.
Page 16mrcool.com
Indoor Unit Installation
Wall
Indoor Outdoor
0.2 - 0.3in
0.2 - 0.3in
(5 - 7 mm)
(5 - 7 mm)
Fig.4.2
MOUNTING PLATE DIMENSIONS
Different models have different mounting plates.
In order to ensure that you have ample room to
mount the indoor unit, the diagrams to the right
show different types of mounting plates along
with the following dimensions:
• Width of mounting plate
• Height of mounting plate
• Width of indoor unit relative to plate
• Height of indoor unit relative to plate
• Recommended position of wall hole (both to
the left and right of mounting plate)
• Relative distances between screw holes
Left rear wall
hole 90mm (3.5in)
Left rear wall
hole 90mm (3.5in)
53.5mm
(2.1in)
Left rear wall
hole 90mm (3.5in)
192mm (7.55in)
43mm (1.7in)
297mm (11.7in)
138mm (5.45in)
57mm (2.25in)
319mm (12.55in)
34mm
(1.35in)
219mm (8.6in)
47mm (1.85in)
335mm (13.2in)
174.3mm (6.85in)
389mm (15.3in)
172mm (6.8in)
426mm( 16.8in)
802mm (31.6in)
Series 12K Models
517.4m m(20.37in)
965mm (38in)
Series 18K Models
553mm (21.77in)
76mm(3in)
1080mm (42.5in)
151mm (5.95in)
Series 24K Models
643.6mm (25.3in)
332mm (13.05in)
257mm (10.1in)
232mm (9.15in)
128mm (5.05in)
144mm (5.65in)
300mm (11.8in)
148.7mm
(5.85in)
43mm (1.7in)
Indoor unit outline
Right rear wall
43mm (1.7in)
hole 90mm (3.5in)
58mm (2.3in)
Indoor unit outline
Right rear wall
hole 90mm (3.5in)
40mm (1.55in)
53.5mm (2.1in)
Indoor unit outline
47mm (1.85in)
Right rear wall
hole 90mm (3.5in)
Correct orientation of Mounting Plate
Left rear wall
hole 90mm (3.5in)
Page 17 mrcool.com
362mm (14.25in)
52mm (2.05in)
1259mm (49.55in)
Series 36K Models
Fig. 4.3
Indoor unit outline
52mm (2.05in)
Right rear wall
hole 90mm (3.5in)
Indoor Unit Installation
Step 4: Prepare refrigerant piping
The refrigerant piping is inside an insulating sleeve
attached to the back of the unit. You must prepare
the piping before passing it through the hole in the
wall. Refer to the Refrigerant Piping Connection
section of this manual for detailed instructions on
torque requirements, technique, etc.
1. Based on the position of the wall hole relative to
the mounting plate, choose the side from which
the piping will exit the unit.
2. Connect the indoor refrigerant piping to the
connective piping that will join the indoor and
outdoor units.
3. Based on the position of the wall hole relative to
the mounting plate, determine the necessary
angle of your piping.
4. Grip the refrigerant piping at the base of the bend.
5. Slowly, with even pressure, bend the piping
towards the hole. Do not dent or damage the
piping during the process.
NOTE ON PIPING ANGLE
Refrigerant piping can exit the indoor
unit from two different angles:
Left-hand side
Right-hand side
Refer to Fig. 4.4 for details.
Indoor Unit
Installation
UNIT IS ADJUSTABLE
Keep in mind that the hooks on the mounting
plate are smaller than the holes on the back
of the unit. If you find that you don’t have
ample room to connect embedded pipes to
the indoor unit, the unit can be adjusted left
or right by about 30-50mm (1.25-1.95in),
depending on the model.
1.2-1.95in
(30-50mm)
Move to left or right
Fig. 4.4
1.2-1.95in
(30-50mm)
Fig. 4.10
CAUTION
Be extremely careful not to dent or damage the piping while bending them away from the unit.
Dents in the piping will affect performance.
Page 18mrcool.com
Indoor Unit Installation
Step 5: Connect Refrigerant Piping to Indoor Unit Refrigerant Pipe Connectors (both ends):
5.1 Tools needed
You will require the following tools to carry out this
installation work correctly:
•1x crescent wrench, 19 mm
•1x crescent wrench, 22 mm/24mm
•1x crescent wrench, 24 mm/27mm
•1x Allen key, 5 mm
•1x Philips screwdriver
•1x leak detection spray or alternatively soap suds
(water/detergent mix)
5.2 Important information
•Follow the detailed instructions for connecting the
refrigerant pipes to the indoor unit and outdoor unit.
We can only provide a warranty if the lines are installed
correctly as described in the instructions.
If the screw connections are tightened with too little
torque, they will leak. If they are tightened with too
much torque, the screw connections may suffer
damage. Please refer to the torque requirements
section for more information. If you are not confident
about connecting the refrigerant line connectors
yourself, it is imperative that you contact the
MRCOOL® customer service team or a professional.
•Do not remove the sealing caps and stoppers until
immediately before you install the lines.
•To prevent leaks, ensure that the quick-release screw
connections are absolutely free of dirt. Moisture or
foreign bodies will adversely affect the function of the
quick-release connectors, leading to a risk of refrigerant
loss (not covered by the warranty).
•Only install refrigerant lines outdoors in dry weather.
•The refrigerant lines must not be plasterred over after
they are installed.
•Please make sure that refrigerant is never allowed to
enter the environment. Improper handling of
refrigerant may be harmful to health. Always wear
work gloves and goggles when handling refrigerant.
•Do not smoke during the installation work. The
equipment must never be o+perated without the
refrigerant lines connected, otherwise the equipment
will be damaged immediately.
•The screw connections may only be tightened using the
appropriate open ended (i.e. crescent or adjustable) wrench.
IMPORTANT:
The EQ valves are only designed for one-time
installation. Their seal can not be guaranteed if they are
installed on more than one occasion. This will also void
the warranty.
5.3 Connecting the refrigerant pipes to the
indoor unit
Do not remove the plastic seals from the indoor
1.
equipment and the appropriate refrigerant pipe
until immediately before you connect them.
2. Align the refrigerant pipes correctly, make sure
the dimensions of the connecting refrigerant pipe
are the same. Place the screw connector on the
refrigerant pipes just on to the thread on the
indoor equipment and tighten the first few
threads by hand.
IMPORTANT:
Before you continue, it is essential that you read
the following instructions carefully.
NOTE: To distinguish the connectors to be
connected to the indoor unit and outdoor unit,
the connectors of the refrigerant pipe has been
labelled “A”, “B”,“C”and “D”. Ensure the marks
on the connectors are the same, to the indoor’s
and outdoor’s respectively during connection.
Page 19 mrcool.com
Indoor Unit Installation
TORQUE REQUIREMENTS
1. Excessive force can break the nut or damage the refrigerant piping. You must not exceed torque
requirements shown in the table below.
2. You can find the Outer Pipe Diameter stamped (in inches) on the valve set of the condenser. Refer to
this when finding and applying the torque values in the table below.
3. Note that there may be differences in Torque Wrenches (i.e. automotive torque wrench versus a HVAC
torque wrench) and that a socket style wrench cannot be used here.
Stamp
1/4”
3/8”
1/2”
5/8”
Outer Diameter
of Pipe (in/mm)
Ø0.25” (Ø 6.35mm)
Ø0.375” (Ø 9.52mm)
Ø0.5” (Ø12.7mm)
Ø0.63” (Ø16mm) 33.19 lb•ft (45 N·m) 34.67lb•ft (47.01N·m)
Tightening Torque
11 lb•ft (14.91 N·m)
18.4 lb•ft (24.95 N·m)
25.8 lb•ft (34.98 N·m)
3. Using open ended wrenches (i.e. crescent or adjustable),
hold the points marked “1” and turn the nuts only at the
points marked “2” (select the appropriate wrench according
to the dimensions of the connector).
1 2
(lb·ft / N·m)
7 In order to prevent Quick Connect® parts from
being exposed to air, sound deadening pads
should be used during the installation.
Add. Tightening Torque
(lb·ft / N·m )
11.8lb•ft (16 N·m)
19.18lb•ft (26 N·m)
26.55lb•ft (36 N·m)
4. Ensure that the screw connectors do not skew as you
tighten them and work quickly.
IMPORTANT: Before you
continue, it is essential that
you read the following
instructions carefully.
5. After finishing the connection,
use the tape to wrap the
refrigerant pipe and
connecting cable together.
6. After you finish connecting
the quick connectors, pass
the drain hose and
refrigerant pipes through the
wall hole as shown here.
NOTE:
The Quick Connect® must be placed outside of the room.
Using the wall hole sleeve, cap and neoprene to seal the
wall hole.
8.Wrap the Quick
Connect® with the
sound deadening pads,
pack down the pads
tightly as shown here.
9. Wrap up the Quick
Connect® with the black
insulation material. For
the top exposed part, use
the white insulation
material (supplied in
Accessories box) to wrap
completely as shown
here.
10. At last, use tape to wrap the refrigerant pipe and
connecting cable together.
Page 20mrcool.com
Indoor Unit Installation
Step 6: Connect drain hose
By default, the drain hose is attached to the left-hand
side of unit (when you’re facing the back of the unit).
However, it can also be attached to the right-hand side.
To ensure proper drainage, the drain hose must exit
1.
the unit on the same side as the refrigerant piping.
Wrap the connection point firmly with included tape
2.
to ensure a good seal and to prevent leaks.
For the portion of the drain hose that will remain
3.
indoors, wrap it with included insulation material to
prevent condensation.
Remove the air filter and pour a small amount of
4.
water into the drain pan to make sure that water
flows from the unit smoothly.
Make sure there are NO
kinks or dents in the
hose to ensure proper
drainage.
Fig. 4.5a
NOT CORRECT
Kinks in the drain hose
will create water traps.
NOTE ON DRAIN HOSE PLACEMENT
Make sure to arrange the drain hose according
to Fig. 4.5a.
DO NOT kink the drain hose.
DO NOT create a water trap.
DO NOT put the end of drain hose in water
or a container that will collect water.
ENSURE UNUSED DRAIN HOLE IS PLUGGED
To prevent unwanted leaks, be sure that the
factory installed rubber plug is in the unused
drain hole.
Fig. 4.5b
NOT CORRECT
Dents in the drain hose
will create water traps.
Fig. 4.5c
NOT CORRECT
DO NOT place the end
of the drain hose in
water or in containers
that collect water.
This will prevent
proper drainage.
Fig. 4.5d
Page 21
mrcool.com
Indoor Unit Installation
Step 7: Wrap piping and cables
Before passing the piping, drain hose, and signal
cable through the wall hole, you must bundle them
together to protect them, and tightly wrap them
together with the provided tape.
1. Bundle the drain hose, refrigerant pipes, and
signal cable according to Fig. 4.6.
Indoor Unit
Space behind unit
Refrigerant piping
Insulation tape
Signal wire
DRAIN HOSE MUST BE ON BOTTOM
Make sure that the drain hose is at the bottom
of the bundle. Putting the drain hose at the
top of the bundle can cause the drain pan to
overflow, which may lead to fire or water
damage.
Drain hose
Fig. 4.6
DO NOT WRAP ENDS OF PIPING
When wrapping the bundle, keep the ends of
the piping unwrapped. You need to access them
to test for leaks at the end of the installation
process (refer to Electrical Checks and Leak
Checks section of this manual).
Step 8: Mount indoor unit
If you installed new connective piping to the
outdoor unit, do the following:
If you have already passed the refrigerant piping
1.
through the hole in the wall, proceed to Step 4.
Otherwise, double-check that the ends of the
2.
refrigerant pipes are sealed to prevent dirt or
foreign material from entering the pipes.
Slowly pass the wrapped bundle of refrigerant
3.
pipes, drain hose, and signal wire through the
hole in the wall.
Hook the top of the indoor unit on the upper
4.
hook of the mounting plate.
DO NOT INTERTWINE SIGNAL CABLE WITH
OTHER WIRES
While bundling these items together, do not
intertwine or cross the signal cable with any
other wiring.
2. Using adhesive vinyl tape, attach the drain hose
to the underside of the refrigerant pipes.
3. Using insulation tape, wrap the signal wire,
refrigerant pipes, and drain hose tightly together.
See Fig. 4.7 for example. Double-check that all
items are bundled in accordance with Fig. 4.6.
Fig. 4.7
Check that unit is hooked firmly on mounting
5.
plate by applying slight pressure to the left and
right-hand sides of the unit. The unit should not
jiggle or shift.
Using even pressure, push down on the bottom
6.
half of the unit. Keep pushing down until the unit
snaps onto the hooks along the bottom of the
mounting plate.
Again, check that the unit is firmly mounted by
7.
applying slight pressure to the left and the
right-hand sides of the unit.
Page 22mrcool.com
Indoor Unit Installation
Outdoor Unit Installation
5
Installation Instructions –
Outdoor Unit
Step 1: Select installation location
Before installing the outdoor unit, you must
choose an appropriate location. The following
standards will help you choose an
appropriate location.
Proper installation locations meet the
following standards:
Meets all spatial requirements shown in
Installation Space Requirements (Fig. 5.1)
Good air circulation and ventilation
24in (60cm)
79in (200cm)
79in (200cm)
in front
in front
12in (30cm)
12in (30cm)
on left
on left
24in (60cm)
above
above
Ground Installed:
12 in (30 cm)
Bracket Installed:
6 in (15 cm)
clearance between
back and wall
24in (60cm)
24in (60cm)
on right
on right
Fig. 5.1
DO NOT install unit in the following locations:
Near an obstacle that will block air inlets and
outlets
Near a public street, crowded areas, or
where noise from the unit will disturb others
Near animals or plants that will be harmed
by hot air discharge
Firm and solid location that can support
the unit and will not cause vibration
Noise from the unit will not disturb others
Protected from prolonged periods of direct
sunlight or rain
Near any source of combustible gas in a
location that is exposed to large amounts of
dust
In a location exposed to a excessive
amounts of salty air
In a location that exposes the unit to large
amounts of forced water
Page 23 mrcool.com
Outdoor Unit Installation
SPECIAL CONSIDERATIONS FOR
EXTREME WEATHER
If the unit is exposed to heavy wind:
Install unit so that 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.
Ensure the wind barrier does not block
necessary air flow. See Fig. 5.2 and
Fig. 5.3 below.
Strong wind
Strong wind
Fig. 5.2
Wind Baffle
If the drain joint comes with a rubber seal (see Fig.
5.4 - A), do the following:
1. Fit the rubber seal on the end of the drain joint that
will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of
the unit.
3. Rotate the drain joint 90° until it clicks in place
facing the front of the unit.
4. Connect a drain hose extension (not included) to
the drain joint to redirect water from the unit during
heating mode.
If the drain joint doesn’t come with a rubber seal
(see Fig. 5.4 - B), do the following:
1. Insert the drain joint into the hole in the base pan
of the unit. The drain joint will click in place.
2. Connect a drain hose extension (not included) to
the drain joint to redirect water from the unit during
heating mode.
Strong wind
Fig. 5.3
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.
Step 2: Install drain joint
Heat pump units require a drain joint if the unit
is elevated. Before bolting the outdoor unit in
place, you must install the drain joint at the
bottom of the unit. Note that there are two
different types of drain joints depending on the
type of outdoor unit.
Base pan hole of
outdoor unit
Seal
Seal
Drain joint (only use if elevated)
(A) (B)
Fig. 5.4
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.
Page 24mrcool.com
D
Outdoor Unit Installation
A
Air Inlet
H
Air Inlet
B
Air Outlet
Step 3: Anchor outdoor unit
The outdoor unit can be anchored to the ground
or to a wall-mounted bracket.
Outdoor Unit Dimensions (inches)
Width (W) x Height (H) x Depth (D)
DIY-12-HP-C-115B
DIY-18-HP-C-230B
DIY-24-HP-C-230B
31.5 x 21.8 x 13.1 (inches)
800 x 554 x 333 mm
33.25 x 27.63 x 14.29 (inches)
845 x 702 x 363 mm
37.21 x 31.9 x 16.53 (inches)
946 x 810 x 420 mm
W
Fig. 5.5
UNIT MOUNTING DIMENSIONS
The following is a list of different outdoor unit
sizes and the distance between their
mounting feet. Prepare the installation base
of the unit according to the dimensions below.
Mounting Dimensions (inches)
Width (A) Depth (B)
20.24 in.
514 mm
21.26 in.
540 mm
26.5 in.
673 mm
13.39 in.
340 mm
13.8 in.
350 mm
15.87 in.
403 mm
DIY-36-HP-C-230B
If you will install the unit on the ground or on a
concrete mounting platform, do the following:
37.21 x 31.9 x 16.53 (inches)
946 x 810 x 420 mm
1. Mark the positions for four expansion bolts based
on dimensions in the Unit Mounting Dimensions
chart.
2. Pre-drill holes for expansion bolts.
3. Clean concrete dust away from holes.
4. Place a nut on the end of each expansion bolt.
5. Hammer expansion bolts into the pre-drilled
holes.
Page 25
mrcool.com
26.5 in.
673 mm
15.87 in.
403 mm
6. Remove the nuts from expansion bolts, and
place outdoor unit on bolts.
7. Put washer on each expansion bolt, then
replace the nuts.
8. Using a wrench, tighten each nut until snug.
WHEN DRILLING INTO CONCRETE,
EYE PROTECTION IS RECOMMENDED
AT ALL TIMES.
Outdoor Unit Installation
If you will install the unit on a wall-mounted
bracket, do the following:
Before installing a wall-mounted unit,
make sure that 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.
1. Mark the position of bracket holes based on
dimensions in the Unit Mounting Dimensions chart.
2. Pre-drill the holes for the expansion bolts.
3. Clean dust and debris away from holes.
4. Place a washer and nut on the end of each
expansion bolt.
5. Thread expansion bolts through holes in mounting
brackets, put mounting brackets in position, and
hammer expansion bolts into the wall.
6. Check that the mounting brackets are level.
7. Carefully lift unit and place its mounting feet on
brackets.
8. Bolt the unit firmly to the brackets.
TO REDUCE VIBRATION OF WALLMOUNTED UNIT
If allowed, you can install the wall-mounted
unit with rubber gaskets to reduce vibration and noise.
mrcool.com
Page 26
Outdoor Unit Installation
Refrigerant Piping Connection
Refrigerant Piping Connection
Connecting the refrigerant pipe to outdoor unit
NOTE
To distinguish the connectors to be connected to the indoor unit and outdoor unit, the
connectors of the refrigerant pipe have been labelled “A”,“B”,“C”and “D”. Ensure the marks on
the connector are the same to the indoor’s and outdoor’s respectively during connection.
CAUTION
For your safety, always wear goggles and work gloves when connecting the pipes.
NOTE: The refrigerant pipes must be connected to the
1. First remove the
water tray on the
outdoor unit as
shown.
valves on the outdoor unit with as little stress as
possible.
IMPORTANT: Before you continue, it is essential that
you read the following instructions carefully.
6
6
2. Do not remove the plastic seals from the
outdoor unit and the appropriate
refrigerant pipes until immediately before
you connect them.
3. Align the refrigerant pipes correctly so that they line
up with the valves and are not stressed. Place the
screw connector on the refrigerant line just on to the
thread on the outdoor unit and tighten the first few
threads by hand.
4. Now tighten the bottom screw connector first and
then the top screw connector using the open ended
wrench (i.e. crescent or adjustable). Using the wrench,
hold the points marked “1” and turn the nuts only at
the points marked “2” (Select the appropriate wrench
according to the dimensions of the connector).
Ensure that the screw connectors do not skew as you
tighten them and work quickly. See below for the
proper torque requirements.
IMPORTANT
Since the coupling works with tapping
rings, it may leak if you undo and
reconnect the pipes. This will also
void the warranty.
2
1
2
1
Page 27
After completing steps 1- 4, check that all the
connections are sealed correctly using leak detection
spray or soap suds. If any bubbles form, the system
has a leak and the screw connectors must be
retightened using an crescent or adjustable wrench.
mrcool.com
Refrigerant Piping Connection
Extend the pipe by unwinding it
1. Use your hands to slowly unwind the copper piping (Quick Connect® line set). Only unwind as much as
necessary for use.
2. If the pipe is repeatedly bent or extended, it will become hard and difficult to manipulate. Avoid bending
or extending the pipe for more than 3 times.
3. Do not bend the pipe excessively, otherwise it will break.
Refer to
Fig. 6.1
Carefully unroll to indoor
handler connection
Radius
≥4in (10cm)
Keep excess coiled
Connect directly to
exterior condensor
TORQUE REQUIREMENTS
MINIMUM BEND RADIUS
When bending connective refrigerant
piping, the minimum bending radius is
a 10cm. Refer to Fig. 6 .1
Fig. 6.1
1. Excessive force can break the nut or damage the refrigerant piping. You must not exceed
torque requirements shown in the table below.
2. You can find the Outer Pipe Diameter stamped (in inches) on the valve set of the con-
denser. Refer to this when finding and applying the torque values in the table below.
3. Note that there may be differences in Torque Wrenches (i.e. automotive torque wrench
versus a HVAC torque wrench) and that a socket style wrench cannot be used here.
Stamp
1/4”
3/8”
1/2”
5/8”
Outer Diameter
of Pipe (in/mm)
Ø0.25” (Ø 6.35mm)
Ø0.375” (Ø 9.52mm)
Ø0.5” (Ø12.7mm)
Ø0.63” (Ø16mm) 33.19 lb•ft (45 N·m) 34.67lb•ft (47.01N·m)
Tightening Torque
(lb·ft / N·m)
11 lb•ft (14.91 N·m)
18.4 lb•ft (24.95 N·m)
25.8 lb•ft (34.98 N·m)
Add. Tightening Torque
(lb·ft / N·m )
11.8lb•ft (16 N·m)
19.18lb•ft (26 N·m)
26.55lb•ft (36 N·m)
mrcool.com
Page 28
Refrigerant Piping Connection
CAUTION
All of these steps must be completed BEFORE powering on the unit. Failing to do so
could damage the unit.
5. Now remove the cover on the top valve using a 19 mm
open ended wrench (i.e. crescent or adjustable). Open the
valve by turning it counter-clockwise as far as it will go
using a 5 mm Allen key. The valve is now open. If the valve
is not opened fully, the system may malfunction and suffer
damage. Screw the cover back on to the top valve and
tighten it well to ensure that it is properly sealed.
6. Now remove the cover on the bottom valve using a 19
mm crescent (or adjustable) wrench. Open the valve by
turning it counter-clockwise as far as it will go using a 5
mm Allen key. The valve is now open. If the valve is not
opened fully, the system may malfunction and suffer
damage. Screw the cover back on to the bottom valve
and tighten it well to ensure that it is properly sealed.
7. After completing steps 1- 6, check that all the connections are sealed correctly using leak detection spray or soap suds.
If any bubbles form, the system has a leak and the screw connectors must be retightened using a crescent or adjustable
wrench.
NOTE
8. Start the equipment so that the operating pressures build
up inside the system. Check all the connectors again for
signs of leaks
a) during cooling mode
b) in heating mode.
If any bubbles form, the system has a
leak and the screw connectors must be
retightened.
9. Wrap any excess piping with the provided tape to
prevent damage from UV Rays. See
and
Fig. 6.3 on the next page for a full instructional diagram.
Page 29
Fig. 6.2 below
Fig. 6.2
mrcool.com
Refrigerant Piping Connection
wrapped from
inside unit
Quick Connect
connections
Signal Cable
wrap the Quick Connect®
connections with the black
sound deadening pads.
(Refer to section 5.3 Connecting the
refrigerant pipes to indoor unit)
®
Drainage Pipe
Refrigerant Piping
wrap from
bottom to top
to ensure tape
overlap sheds
water
coil then wrap
bundled excess
Fig. 6.3
Outdoor Unit (Exterior / Condenser)
BEFORE PERFORMING ELECTRICAL WORK, READ THESE REGULATIONS
All wiring must comply with local and national electrical codes.
1.
2. All electrical connections must be made according to the Electrical Connection Diagram located on the
panels of the indoor and outdoor units.
3. If there is a serious safety issue with the power supply, stop work immediately. Explain your reasoning
to the client, and refuse to install the unit until the safety issue is properly resolved.
4. Power voltage should be within 90-100% of rated voltage. Insufficient power supply can cause
malfunction, electrical shock, or fire.
5. Circuit, including any switches, should have a capacity 1.5 times the maximum unit current (amps).
6. A qualified technician must use an approved circuit breaker or switch that disconnects all poles and has
has a contact separation of at least 1/8in (3mm).
7. Do not connect another appliance to the same circuit.
8. Make sure to properly ground the air conditioner.
9. Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in
malfunction and possible fire.
10. Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the
unit.
11. If the unit has an auxiliary electric heater, it must be installed at least 40in (1 meter) away from
combustible materials.
mrcool.com
Page 30
Electrical Connections
7
Connect signal and power cables
The outside unit’s terminal block is protected by an electrical wiring cover on the side of the unit.
A comprehensive wiring diagram is printed on the inside of the wiring cover.
BEFORE PERFORMING ANY ELECTRICAL WORK, TURN OFF ALL POWER TO THE SYSTEM.
Note that wire colors of this series / model may differ from previous models, other series and
general conventions.
shown in Fig. 7.1 and demonstrated in the images
All wiring must be performed in accordance with the wiring diagrams
below.
WIRE CONNECTING DIAGRAM (12K Unit Only)
OUTDOOR UNIT TE RMINAL
3
2 L N1
GREEN
RED
TO INDOOR UNIT
(Communications Wire)
DO NOT MIX UP LIVE AND NULL
WIRES
This is dangerous and can cause the air
conditioning unit to malfunction. Make
sure you clearly distinguish the Live (”L”)
Wires from the other wires.
BLACK
WHITE
L N
3
21
115V
POWE R S UPPLY
Y/G
Fig. 7.1
WIRE CONNECTING DIAGRAM (All Other Units)
OUTDOOR UNIT TE RMINAL
3
2 L1L21
GREEN
RED
TO INDOOR UNIT
(Communications Wire)
WIRES AND TERMINALS ARE NUMBERED
MATCH AS SHOWN
BLACK
WHITE
L1L2
3
21
208/ 230V
POWE R S UPPLY
Y/G
All wiring must be performed in
accordance with the wiring diagrams
shown in Fig. 7.1 and demonstrated in
the images shown here.
Page 31 mrcool.com
Electrical Connections
1.
Prepare the cable for connection:
USE THE RIGHT CABLE
• Outdoor power cable: H07RN-F
• See table below for gauge requirements
• Indoor power / signal cable from outdoor
unit is provided (see Indoor Unit Installation)
Minimum Wire Gauge
North
for Power Cables
America
2.
Unscrew the electrical wiring cover and remove it.
3.
Unscrew the cable clamp below the terminal block
and place it to the side.
4.
Match the wire colors / labels with the labels on
the terminal block, and firmly screw the u-lug of each
wire to its corresponding terminal.
5.
After checking to make sure every connection is
secure, loop the wires around to prevent rain water
from flowing into the terminal.
Model Series
9K & 12K
18K
24K
36K
Other Regions
Rated Current
of Appliance (A)
> 3 and 6
> 6 and
> 10 and
> 16 and
> 25 and
> 32 and
10
16
25
32
40 6
Appliance
Amps(A)
15 14
20
25
35
Nominal
Cross-Sectional
Area (mm²)
0.75
1
1.5
2.5
4
AWG
12
10
8
6.
Using the cable clamp, fasten the cable to the
unit. Screw the cable clamp down tightly.
7.
Insulate unused wires with PVC electrical tape.
Arrange them so that they do not touch any electrical
or metal parts.
8.
Replace the wire cover on the side of the unit, and
screw it in place.
Outdoor Unit
Wiring Diagram
is located on
Cover
the inside of the
wire cover on
the outdoor unit.
a. Using wire strippers, strip the rubber jacket
from both ends of cable to reveal about
1.57in (40mm) of the wires inside.
b. Strip the insulation from the ends of the
wires.
c. Using a wire crimper, crimp u-lugs on the
ends of the wires.
ALL WIRING MUST BE PERFORMED STRICTLY
IN ACCORDANCE WITH THE WIRING
DIAGRAM LOCATED AS SHOWN IN FIG 7.2.
NOTE ABOUT FUSE SPECIFICATIONS
The air conditioner’s circuit board (PCB) is
designed with a fuse to provide overcurrent
protection. The specifications of the fuse are
printed on the circuit board.
EXAMPLE Indoor unit: T3.15AL/250VAC,
T5AL/250VAC, T3.15A/250VAC, T5A/250VAC, etc.
EXAMPLE Outdoor unit:
T20A/250VAC(<=18000Btu/h units),
T30A/250VAC(>18000Btu/h units), etc.
mrcool.com
Fig. 7.2
Page 32
Refrigerant Piping Connection
Electrical and Gas Leak Checks
Electrical and Gas Leak Checks
8
8
Electrical Safety Checks
After installation, confirm that all electrical wiring is
installed in accordance with local and national
regulations, and according to the Installation
Manual.
BEFORE TEST RUN
Check Grounding Work
Measure grounding resistance by visual detection
and with grounding resistance tester. Grounding
resistance must be less than 4.
Note: This may not be required for some locations
in the US.
DURING TEST RUN
Check for Electrical Leakage
During the Test Run, use an electroprobe and
multimeter to perform a comprehensive electrical
leakage test.
WARNING – RISK OF
ELECTRIC SHOCK
ALL WIRING MUST COMPLY WITH LOCAL,
STATE, AND NATIONAL ELECTRICAL CODES,
AND MUST BE INSTALLED BY A LICENSED
ELECTRICIAN.
Gas Leak Checks
There are two different methods to check for
gaseous leaks.
Soap and Water Method
Using a soft brush, apply soapy water or liquid
detergent to all pipe connection points on the
indoor unit and outdoor unit. The presence of
bubbles indicates a leak.
Leak Detector Method
If using leak detector, refer to the device’s opera-
tion manual for proper usage instructions.
If electrical leakage is detected, turn off the unit
immediately and call a licensed electrician to find
and resolve the cause of the leakage.
Note: This may not be required for some locations
in the US.
Page 33
AFTER PERFORMING GAS LEAK CHECKS
After confirming that all the pipe connection
points DO NOT leak, replace the valve cover
on the outside unit.
mrcool.com
Test Run
Before Test Run
Refrigerant Piping Connection
9
Only perform test run after you have
completed the following steps:
• Electrical Safety Checks – Confirm that
the electrical system is safe and operating
properly
• Gas Leak Checks – Check all flare nut
connections and confirm that the system is
not leaking
• Confirm that gas and liquid (high and low
pressure) valves are fully open
Test Run Instructions
You should perform the Test Run for at least
30 minutes.
1. Connect power to the unit.
List of Checks to Perform PASS/FAIL
No electrical leakage
Unit is properly grounded
All electrical terminals
properly covered
Indoor and outdoor units
are solidly installed
Wall Penetration Sleeve is
packed airtight
All pipe connection points
do not leak
Water drains properly
from drain hose
Outdoor (2):
Indoor (2):
2. Press the ON/OFF button on the remote
controller to turn it on.
3. Press the MODE button to scroll through the
following functions, one at a time:
• COOL – Select lowest possible temperature
• HEAT – Select highest possible temperature
4. Let each function run for 5 minutes, and perform
the following checks:
All piping is properly
insulated
Unit performs COOL
function properly
Unit performs HEAT
function properly
Indoor unit louvers rotate
properly
Indoor unit responds to
remote control
Page 34mrcool.com
Test Run
DOUBLE-CHECK PIPE CONNECTIONS
During operation, the pressure of the
refrigerant circuit will increase. This may
reveal leaks that were not present during your
initial leak check. Take time during the Test
Run to double-check that all refrigerant pipe
connection points do not have leaks. Refer to
Gas Leak Check section for instructions.
5. After the Test Run is successfully complete, and
you confirm all check points in List of Checks to
Perform have PASSED, do the following:
a. Using remote control, return unit to normal
operating temperature.
b. Using insulation tape, wrap the indoor refrigerant
pipe connections that you left uncovered during the
indoor unit installation process.
Manual control button
Fig. 9.1
IF AMBIENT TEMPERATURE IS BELOW
63°F (17°C)
You can’t use the remote controller to turn
on the COOL function when the ambient
temperature is below 63°F. In this
instance, you can use the MANUAL
CONTROL button to test the COOL
function.
1.Lift the front panel of the indoor unit,
and raise it until it clicks in place.
2.The MANUAL CONTROL button is
located on the right-hand side of the
unit. Press it 2 times to select the COOL
function. See Fig.9.1
3.Perform Test Run as normal.
THANK YOU
Thank you for purchasing a MRCOOL
ductless mini-split heating and air
conditioning product.
MRCOOL is a young, family-owned
company, so we are truly thankful you
trusted us with your business. Should you
need any technical support or just have
questions about your MRCOOL product,
please don’t hesitate to call us at
270-366-0457.
And if you can spare a few minutes today,
®
a review of your new MRCOOL
the partner site where you purchased it
would really help us out. Real reviews
from actual customers like you are
invaluable to a growing company like ours.
product on
Page 35 mrcool.com
Again, thanks for being a valued customer!
Troubleshooting
10
The following events may occur during normal operation, and may not indicate malfunction.
Symptom Cause
Operation is
delayed after restart
Fan speed changes
- off, very slow and
then normal
Heating operation
stops suddenly and
defrost-light blinks
Mist coming out of
the indoor unit
Low volume sounds
are emitted by the
air conditioner
To prevent blowout of the fuse, the compressor will not operate while
the protection circuit is working for about 3 minutes after sudden OFF--ON
operation of the power supply.
Automatically happens in heating mode :
--prevents cold air blowing onto occupants when heating operation starts
--perform automatic defrosting operation
--perform low temperature heating operation
In HEAT mode, the indoor unit temporarily stops for maximum of 10
minutes to perform the automatic defrosting operation.
In COOL mode, a mist generated by condensation formed with sudden
cooling process may be emitted.
Mist may generate due to moisture from defrosting process when the air
conditioner restarts in HEAT mode operation after defrosting.
Hissing sound -- during operation or immediately after stopping the air
conditioner, refrigerant flowing sound may be heard.
Squeaking sound -- normal expansion and contraction of plastic and
metal parts caused by temperature change during the operation.
Rushing air -- when louver resets its position.
Dust discharges
from the unit
Emits a peculiar
odor
Changes to fan only
while cooling or
heating mode
Operation is erratic,
unpredictable or
unresponsive
NOTE: If the problem is not resolved, please contact a qualified service professional. Be sure to inform
NOTE: If the problem is not resolved, please contact a qualified service professional. Be sure to inform
them of the detailed malfunctions and unit model number.
them of the detailed malfunctions and unit model number.
May occur when air conditioner is used for the first time or has not been
used for a long time.
Various smells generated from interior textile, furniture, or cigarette smoke
absorbed into the air conditioner may be emitted. If not the case, contact a
local dealer or your installation contractor.
Room temperature reaches the temperature setting of the remote control.
If not the case, contact a local dealer or your installation contractor.
Interference from cell phone towers and remote boosters may cause the
unit to malfunction.
Turn power off on unit and circuit at breaker, wait 10 seconds and power on.
Press the ON/OFF button on the remote controller to restart operation.
mrcool.com
Page 36
Troubleshooting
Before you call to request service assistance, troubleshoot a problem by performing the following checks:
Symptom Diagnostic
-- Is there a power failure?
Unit will not operate
Poor cooling or
heating performance
Indicator lamps
continue flashing
Error code appears
in the indoor unit,
such as: E0,E1,E2....
P1,P2,P3.....
or F1, F2,F3.....
-- Has a switch been turned off, a circuit breaker tripped or a fuse blown?
-- Is the timer operating?
-- Are the batteries used in the remote controller exhausted?
-- Are the batteries used in the remote controller loaded properly?
-- Are the air filters dirty?
-- Is air flow unrestricted in & out of indoor & outdoor units?
-- Are the temperature and mode settings correct?
-- Are the windows or doors left opened?
-- Is fan speed on high and louvers allowing maximum flow?
-- Is direct or strong sunlight shining into the room in cooling operation?
-- Are there other heating apparatus or computers operating, or too many
people in the room in cooling operation?
-- Is the SILENCE function activated? Under SILENCE operation,
noise reduction is prioritized and the air-conditioning performance may
become lower.
The unit may stop operation or continue to run in a safety condition
-(depending on models). Waiting for about 10 minutes, the fault may be
recovered automatically, if not, disconnect the power and then connect
it again. If the problem still exists, disconnect the power and contact
the nearest customer service center.
Note that the wire colors of this series / model may differ from previous models,
other series and general conventions.
accordance with the wiring diagrams shown in Section 7 Fig. 7.1 and associated
images
. Wires and terminals are numbered to match accordingly.
All wiring must be performed in
NOTE: If the problem is not resolved, please contact a qualified service professional.
Be sure to inform them of the detailed malfunctions and unit model number.
WARNING
In the case of ANY of the following, turn off the unit immediately!
· Signal / power cable is damaged or abnormally warm
· Burning odor
· Loud or abnormal sounds
· A power fuse or circuit breaker trips frequently
· Water or other objects fall into or out of the unit
Page 37
mrcool.com
DO NOT ATTEMPT TO CORRECT
THESE ITEMS YOURSELF!
CONTACT A SERVICE
PROFESSIONAL IMMEDIATELY
Indoor Unit Error Display
O
peration LEDTimer LED
Troubleshooting
D
isplay
L
ED STATUS
1 time
2
times
3 times
4 times
5 times
6 times
7 times
2 times
3 times
4 times
X E
X E
X E
X E
X E
X E
X E
O F
O F
O F
3/E88
0
1
2
4
5
C
1
2
3
Indoor unit EEPROM parameter error
Indoor / outdoor units communication error **
Zero-crossing signal detection error
Indoor fan speed has been out of control
Indoor room temperature sensor T1 open circuit or
short circuit
E
vaporator coil temperature sensor T2 open circuit or
short circuit
Refrigerant leakage detection
Outdoor ambient temperature sensor T4 open circuit
or short circuit
Condenser coil temperature sensor T3 open circuit or
short circuit
Compressor discharge temperature sensor T5 open
circuit or short circuit
5 times
6 times
1 time
2 times
3 times
5 times
**
Note that the wire colors of this series / model may differ from previous models, other series and
general conventions.
Section 7 Fig. 7.1 and associated images
O F
O F
All wiring must be performed in accordance with the wiring diagrams shown in
P
P
P
P
P
P
4
5
0
1
2
4
6
7
Outdoor unit EEPROM parameter error
Outdoor fan speed has been out of control
IPM malfunction or IGBT over-strong current protection
Over voltage or over low voltage protection
High temperature protection of compressor top diagnosis and solution (only for 9k,12k models)
Inverter compressor drive error
Discharge temp sensor
USB Smart Controller module not installed
. Wires and terminals are numbered to match accordingly.
O（light） X（off） （flash）
mrcool.com
Page 38
Refrigerant Piping Connection
EU Disposal Guidelines
11
This appliance contains refrigerant and other potentially hazardous materials. When disposing of this appliance, the law requires special collection and treatment. DO NOT dispose of this product as household waste
or unsorted municipal waste.
When disposing of this appliance, you have the following options:
• Dispose of the appliance at a designated municipal electronic waste collection facility.
• When buying a new appliance, the retailer will receive the old appliance free of charge.
• The manufacturer will receive the old appliance free of charge.
• Sell the appliance to certified scrap metal dealers.
Special notice
Disposing of this appliance in the forest or other natural surroundings endangers your health
and is bad for the environment. Hazardous substances may leak into the ground water and
enter the food chain.
Page 39
mrcool.com
®
™
DIY
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.
E Star
Series
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