MrCool Olympus Series User manual

Please read this manual carefully before installation and keep it for future reference.
Please keep this manual where the operator can easily find it. Inside, you
will find helpful hints on how to use and maintain your unit properly.
For more info visit www.mrcool.com
If used as MULTI unit, please refer to the Installation & operation manuals packed with outdoor unit.
Installation Manual
Olympus Series
Cassette Air Handlers

Contents
Page 1 mrcool.com
Safety Precautions
Warnings ............................................................................................................................... 2
Cautions ................................................................................................................................ 3
Installation Summary ............................................................................................ 4
Accessories ...................................................................................................................... 5
Indoor Unit Installation ....................................................................................... 7
Outdoor Unit Installation ................................................................................... 10
Refrigerant Piping Installation ........................................................................ 12
Connecting the Drain Pipe .................................................................................. 16
Electrical Wiring Work ............................................................................................ 18
Decorative Panel Installation ........................................................................... 20
Test Operation .............................................................................................................. 21
EU Disposal Guidelines ........................................................................................... 22
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2
3
4
5
6
7
8
9
10

Page 2
Safety Precautions
mrcool.com
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.
WARNING
CAUTION
WARNING
• Installation must be performed in accordance with the requirement of NEC and CEC by authorized
personnel only.
• Be sure only trained and qualified service personnel install, repair or service the equipment.
• Improper installation, repair, and maintenance may result in electric shocks, short-circuit, leaks, personal
injury, loss of life, fire or other damage to the equipment.
• Install according to this installation instructions strictly. If installation is defective, it will cause water
leakage, electrical shock and fire.
• When installing the unit in a small room, take measures against to keep refrigerant concentration from
exceeding allowable safety limits in the event of refrigerant leakage. Contact the place of purchase for
more information. Excessive refrigerant in a closed ambient can lead to oxygen deficiency.
• Use the attached accessories parts and specified parts for installation. Otherwise, it will cause the set to
fall, leak water, cause electrical shock, or produce fire.
• Install at a strong and firm location which is able to withstand the set' s weight. If the strength is not
enough or installation is not properly done, the set will drop causing injury.
• The appliance must be installed 8.2 ft/2.5m above floor.
• The appliance shall not be installed in the laundry room.
• Before obtaining access to terminals, all supply circuits must be disconnected.
• The appliance must be positioned so that the plug is accessible.
• The enclosure of the appliance shall be marked by word, or by symbols, with the direction of the fluid
flow.
• Read this manual attentively before starting up the units.
• For electrical work, follow the local national wiring standard, regulation and these installation instructions.
An independent circuit and single outlet must be used. If electrical circuit capacity is not enough or defect
in electrical work, it will cause electrical shock or fire.
• Use the specified cable and connect tightly and clamp the cable so that no external force will be acted on
the terminal. If connection or fixing is not perfect, it will cause heat-up or fire at the connection.
This symbol indicates that ignoring instructions may cause death or serious injury.
This symbol indicates that ignoring instructions may cause moderate injury
to your person, damage to your unit, or other property.
This symbol indicates that you should NEVER perform the indicated action.
!
Safety Precautions

WARNING
CAUTION
• Wiring routing must be properly arranged so that control board cover is fixed properly. If control board
cover is not fixed perfectly, it will cause heat-up at connection point of terminal, fire or electrical shock.
• If the supply cord is damaged, it must be replaced by the manufacture or its service agent or a similarly
qualified person in order to avoid a hazard.
• An all-pole disconnection switch having a contact separation of at least 0.12in in all poles should be
connected in fixed wiring.
• When carrying out piping connection, take care to not let air substances go into refrigeration cycle.
Otherwise, it will cause lower capacity, abnormally high pressure in the refrigeration cycle, explosion and
injury.
• Do not modify the length of the power supply cord or use an extension cord, and do not share the single
outlet with other electrical appliances. Otherwise, it will cause fire or electrical shock.
• If the refrigerant leaks during installation, ventilate the area immediately. Toxic gas may be produced if
the refrigerant comes in contact with fire.
• The temperature of refrigerant circuit will be high, please keep the interconnection cable away from the
copper tube.
• After completing the installation work, check that the refrigerant does not leak. Toxic gas may be
produced if the refrigerant leaks into the room and comes into contact with a source of fire, such as a fan
heater, stove or cooker.
• After completing the installation, make sure that the unit operates properly during the start-up operation.
Please instruct the customer on how to operate the unit and keep it maintained. Also, inform customers
that they should store this installation manual along with the owner's manual for future reference.
Safety Precautions
Page 3 mrcool.com
DO NOT connect the ground wire to gas or water pipes, lightning rod or a telephone ground wire.
Inappropriate grounding may result in electric shocks.
DO NOT connect the air conditioner with the power supply until the wiring and piping is done.
DO NOT operate your air conditioner in a wet room such as a bathroom or laundry room.
DO NOT install the air conditioner in the following circumstance:
• There is petrolatum existing.
• There is salty air surrounding (near the coast).
• There is caustic gas (the sulfide, for example) existing in the air (near a hot spring).
• The Volt vibrates violently (in the factories).
• In buses or cabinets.
• In kitchen where it is full of oil gas.
• There is strong electromagnetic waves existing.
• There are inflammable materials or gas.
• There is acid or alkaline liquid evaporating.
• Other special conditions.
• Ground the air conditioner.
• Be sure to install an earth leakage breaker. Failure to install an earth leakage breaker may result in
electric shocks.
• Connect the outdoor unit wires, then connect the indoor unit wires.

Installation Summary
Page 4mrcool.com
1
Installation Summary
• To install properly, please read this "installation manual" at first.
• The air conditioner must be installed by qualified persons.
• When installing the indoor unit or its tubing, please follow this manual as strictly as possible.
• If the air conditioner is installed on a metal part of the building, it must be electrically insulated according to the
relevant standards to electrical appliances.
• When all the installation work is finished, please turn on the power only after a thorough check.
• Regret for no further announcement if there is any change of this manual caused by product improvement.
1. Indoor unit installation
2. Outdoor unit installation
3. Install the refrigerant pipe
4. Connect the drain pipe
5. Electric wiring work
6. Installation of the decoration panel
7. Test operation
INSTALLATION INFORMATION
INSTALLATION ORDER
Is the indoor unit fixed firmly?
The unit may drop,vibrate or make noise.
Is the gas leak test finished?
It may result in insufficient cooling or heating.
Is the unit fully insulated?
Condensate water may drip.
Does drainage flow smoothly?
Condensate water may drip.
Does the power supply voltage correspond to that
shown on the name plate?
The unit may malfunction or components may burn out.
Are wiring and piping correct?
The unit may malfunction or components may burn out.
Is the unit safely grounded?
Dangerous at electric leakage.
Is the wiring size in accordance with specifications?
The unit may malfunction or components may burn out.
Is anything blocking the air outlet or inlet of either the
indoor or outdoor units?
It may result in insufficient cooling or heating.
Are refrigerant piping length and additional refrigerant
charge noted down?
The refrigerant charge in the system might not be clear.
CHECK OFF WHEN COMPLETED

Accessories
Page 5 mrcool.com
2
4
4
1
1
1
2
1
Expansible hooks
(on some models)
Installation hooks
(on some models)
Throttle
(on some models)
Anti-shock rubber
(on some models)
Tapping screws
(M3X10mm)
(on some models)
Remote control
Fixing screw for remote
control holder
ST2.9 x 10
Remote control holder
Batteries
Metal champ
(on some models)
Drain hose
(on some models)
2
1
Optional
Parts
2
1
PART LOOKS LIKE... QUANTITY
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.

Accessories
Page 6mrcool.com
1
1
1
1
1
Owner’s Manual
Drain plug
(only heat pump models)
(with the outdoor unit)
Seal ring
(only heat pump models)
(with the outdoor unit)
Installation Manual
Paper pattern for
installation (on some
models)
PART LOOKS LIKE... QUANTITY
Please read this manual carefully before installation and keep it for future reference.
Owner’s Manual
Olympus Series
Cassette Air Handlers
For more details visit www.MrCool.com
Please read this manual carefully before installation and keep it for future reference.
Please read this manual carefully before installation and keep it for future reference.
Installation Manual
Olympus Series
Cassette Air Handlers
NOTE
All the pictures in this manual are for explanation purpose only. There may be slightly different from
the air conditioner you purchased ( depend on model ). The actual shape may vary.
This indoor unit requires installation of an optional decoration panel.

Indoor Unit Installation
Page 7 mrcool.com
3
22
1
1000/39.4in
1000/39.4in
1000/39.4in
1000/39.4in
1000/39.4in
1000/39.4in
2500/98.4in
260/10.2in
290/11.4in
1 Air inlet
2 Air outlet
Unit: mm
Selecting Installation Site
When the conditions in the ceiling are exceeding 30°C / 86°F and
a relative humidity of 80%, or when fresh air is inducted into the
ceiling, an additional insulation is required (minimum 0.4in /
10mm thickness, polyethylene foam).
1. Select an installation site where the following conditions are
fulfilled and that meets your customer's approval.
• Where optimum air distribution can be ensured.
• Where nothing blocks air passage.
• Where condensate water can be properly drained.
• Where the false ceiling is not noticeably on an incline.
• Where sufficient clearance for maintenance and service can be
ensured.
• Where there is no risk of flammable gas leaking.
• The equipment is not intended for use in a potentially explosive
atmosphere.
• Where piping between indoor and outdoor units is possible
within the allowable limit. (Refer to the installation manual of the
outdoor unit.)
• Keep indoor unit, outdoor unit, inter unit wiring and remote
control wiring at least 3.3 feet (1Meter) away from televisions
and radios. This is to prevent image interference and noise in
those electrical appliances. (Noise may be generated depending
on the conditions under which the electric wave is generated,
even if proper distance is kept.)
• When installing the wireless remote control kit, the distance
between wireless remote control and indoor unit might be
shorter if there are fluorescent lights that are electrically started
in the room. The indoor unit must be installed as far away as
possible from fluorescent lights.
WARNING
Do not install the unit in an area where flammable materials are present due to risk of explosion resulting in
serious injury or death.
If the basis underneath the unit is not strong enough to support the weight of the unit, the unit could be fall out
of place and cause serious injury.
2. Ceiling height
Install this unit where the height of bottom panel is
more than 8.2 ft / 2.5m so that the user cannot
easily touch.
3. Use installation hooks
Use installation hooks for installation. Check
whether the ceiling is strong enough to
support the weight of the indoor unit. If there
is a risk, reinforce the ceiling before installing
the unit. Space required for installation. See
Fig. 3.4 on the next page for details.
Fig. 3.1

Indoor Unit Installation
Page 8mrcool.com
Preparations before installation
1. Relation of ceiling opening to unit and suspension bolt position.
2. Create the ceiling opening needed for indoor
installation where applicable. (For existing
ceilings.)
• Create the ceiling opening required for installation. From
the side of the opening to the casing outlet, implement the
refrigerant and drain piping and wiring for remote control
(unnecessary for wireless type). Refer to each piping or
wiring section.
• After making an opening in the ceiling, it may be necessary
to reinforce ceiling beams to keep the ceiling level and to
prevent it from vibrating. Consult the builder for details.
3. Install the installation hooks. (Use either a M8 or
M10 size bolt.)
• Use expansible hooks, sunken anchors or other field
supplied parts to reinforce the ceiling in order to bear the
weight of the unit.
• Adjust clearance from the ceiling before proceeding
further. See Fig. 3.4 for Installation example.
Installation is possible with a ceiling dimension of 23.6in /
600mm (marked with*). However, to achieve a ceiling-panel
overlapping dimension of 0.6in / 15mm, the spacing
between the ceiling and the unit should be 0.8in / 20mm or
less. If the spacing between ceiling and the unit is over
0.8in / 20mm, attach sealing material in the part or recover
the ceiling.
For other installation other than standard installation,
contact your dealer for details.
1 Ceiling slab
2 Expansible hook (optional)
3 Installation hook (optional)
4 False ceiling
30~35mm 1.2~1.4in
1
2
3
4
Fig. 3.4
1
1
2
2
3
3
545/21.5in
523/20.6in
570/22.4in
570/22.4in
647/25.5in
647/25.5in
45
70/2.8in
15/0.6in15/0.6in600/23.6in6
7
8
20/0.8in20/0.8in
Unit: mm
Fig. 3.2
1. Installation hook pitch dimensions
2. Indoor unit dimensions
3. Decoration panel dimensions
4. Refrigerant piping
5. Installation hook
6. Ceiling opening dimensions
7. Hanger bracket
8. False ceiling
1 Indoor unit
2 False ceiling
1
2
24mm
0.9in
Fig. 3.3
Adjust the position to ensure the gaps between the
indoor unit and the four sides of false ceiling are even.
The indoor unit's lower part should sink into the false
ceiling for 24mm / 0.9in. See Fig. 3.3.
NOTE

Indoor Unit Installation
Page 9 mrcool.com
Install the indoor unit
When installing optional accessories, read also the
installation manual of the optional accessories.
Depending on the field conditions, it may be easier to
install optional accessories before the indoor unit is
installed (except for the decoration panel). However, for
existing ceiling, install fresh air inlet component kit and
branch duct before installing the unit.
1. Install the indoor unit temporarily.
• Attach the hanger bracket to the suspension bolt. Be
sure to fix it securely by using a nut and washer from
the upper and lower sides of the hanger bracket.
• Securing the hanger bracket see figure below.
2. Fix the paper pattern for installation.
(For new ceilings only)
• The paper pattern for installation corresponds with
the measurements of the ceiling opening. Consult the
builder for details.
• The center of the ceiling opening is indicated on the
paper pattern for installation.
•After removing the packaging material from the paper
patten for installation, attach the paper pattern for
installation to the unit with the attached screws as
shown in figure below.
3. Adjust the unit to the right position for
installation.
(Refer to the chapter "Preparations before
installation").
4. Check if the unit is horizontally leveled.
• Do not install the unit tilted. The indoor unit is
equipped with a built-in drain pump and float switch.
(If the unit is tilted against the direction of the
condensate flow (the drain piping side is raised), the
float switch may malfunction and cause water to
drip.)
• Check if the unit is leveled at all four corners with a
water level or a water-filled vinyl tube as shown in
figure below.
5. Remove the paper pattern for installation.
(For new ceilings only)
Water
Level
Water
Level
Vinyl
Tube
Vinyl
Tube
Paper pattern for installation
(on some models)
Center of the ceiling opening
Screws(supplied with
the decoration panel)
Nut (field supply)
Washer
(field supply)
Hanger
bracket
Double nuts
(field supply,
tighten)
Fig. 3.5
Fig. 3.7
Fig. 3.6

MODEL A
780548266300241250540
B C D E F H
9K~18K760530290315270285590
810
845
549
560
325
335
350
360
305
312
310
320
558
700
Unit:mm
A
B
F
E
C
D
H
(in=mm/25.4)
Outdoor Installation
Page 10mrcool.com
4
4.1 Precautions for selecting the location
1. Choose a place solid enough to bear the weight and
vibration of the unit, where the operation noise will not
be amplified.
2. Choose a location where the hot air discharged from the
unit or the operation noise will not cause a nuisance to
the neighbors of the user.
3. Avoid places near a bedroom and the like, so that the
operation noise will cause no trouble.
4. There must be sufficient space for carrying the unit into
and out of the site.
5. There must be sufficient space for air passage and no
obstructions around the air inlet and the air outlet.
6. The site must be free from the possibility of flammable
gas leakage in a nearby place.
7. Install units, power cords and inter-unit wire at least
9.8ft. away from television and radio sets. This prevents
interference to images and sounds. (Noises may be
heard even if they are more than 9.8 ft. away depending
on radio wave conditions.)
8. In coastal areas or other places with salty atmosphere of
sulfate gas, corrosion may shorten the life of the air
conditioner.
9. Since drain flows out of the outdoor unit, do not place
anything under the unit that must be kept away from
moisture.
Cannot be installed hanging from ceiling or stacked.
NOTE
When operating the air conditioner in a low
outdoor ambient temperature, be sure to follow
the instructions described below.
• To prevent exposure to wind, install the outdoor
unit with its suction side facing the wall.
• Never install the outdoor unit at a site where the
suction side may be exposed directly to wind.
• To prevent exposure to wind, it is recommended
to install a baffle plate on the air discharge side
of the outdoor unit.
• In heavy snowfall areas, select an installation site
where the snow will not affect the unit.
CAUTION
Construct a
large canopy
Construct
a pedestal
Install the unit high enough off the
ground to prevent burying in snow
Fig. 4.1
Fig. 4.2

Outdoor Installation
Page 11 mrcool.com
4.2 Installation Guidelines 4.3 Installing Outdoor Unit
4.4 Installing Outdoor Unit
• Where a wall or other obstacle is in the path of outdoor
unit's inlet or outlet airflow, follow the installation guide-
lines below.
• For any of the below installation patterns, the wall height
on the outlet side should be 1200mm or less.
• When installing the outdoor unit, refer to "Precautions
for selecting the location".
• Check the strength and level of the installation ground
so that the unit will not cause any operating vibration or
noise after installed.
• Fix the unit securely by means of the foundation bolts.
(Prepare 4 sets of M8 or M10 foundation bolts, nuts and
washers each which are available on the market.)
• If drain work is necessary, follow the procedures below.
• Use drain plug for drainage.
• If the drain port is covered by a mounting base or floor
surface, place additional foot bases of at least 1.2in-
./30mm in height under the outdoor unit’s feet.
• In cold areas, do not use a drain hose with the outdoor
unit. (Otherwise, drain water may freeze, impairing
heating performance.)
Drain port
Bottom frameSeal
Drain plug
Hose
Fix with bolts
Wall facing one side
Walls facing three sides
Walls facing two sides
1200
or less
Direction
of air
More than 100More than 350
Side view
Fig. 4.3
Fig. 4.4
Fig. 4.5
Fig. 4.6
Fig. 4.7
Top view
More than 50
More
than 100
More
than 350
More than 50
Top view
More than 50
More than 100
More than 350
Unit:mm
(in=mm/25.4)

CAUTION
• Execute heat insulation work completely on both sides of the gas piping and liquid piping.
Otherwise, this can sometimes result in water leakage. (When using a heat pump, the
temperature of the gas piping can reach up to approximately 120°C /248° F. Use insulation
which is sufficiently resistant.)
• Also, in cases where the temperature and humidity of the refrigerant piping sections might
exceed 30°C /86° F or Rh80%, reinforce the refrigerant insulation (20mm/0.8in or thicker).
Condensation may form on the surface of the insulating material.
• Before rigging tubes, check which type of refrigerant is used.
• Use a pipe cutter and flare suitable for used refrigerant.
• Only use annealed material for flare connections.
• If the refrigerant gas leaks during the work, ventilate the area. A toxic gas is emitted by the
refrigerant gas being exposed to a fire.
• Make sure there is no refrigerant gas leak. A toxic gas may be released by the refrigerant gas
leaking indoor and being exposed to flames from an area heater, cooking stove, etc.
• Refer to the Fig 5.1 for the dimensions of flare nuts spaces and the appropriate tightening
torque. (Over-tightening may damage the flare and cause leaks.)
• Check whether the height drop between the indoor unit and outdoor unit, and the length of
refrigerant pipe meet the following requirements in Fig 5.2:
WARNING
All field piping must be provided by a licensed refrigeration technician and must comply with the
relevant local and national codes.
Refrigerant Piping Installation
Page 12mrcool.com
5
Pipe gauge
(mm)Tightening torqueFlare dimension
A (mm)Flare shape
O6.35(1/4 in)15~16 N. m
(153~163 kgf.cm)8.3~8.7
0.327~0.343in
12.0~12.4
0.472~0.488in
15.4~15.8
0.606~0.622in
18.6~19.0
0.732~0.748in
25~26 N. m
(255~265 kgf.cm)
35~36 N. m
(357~367 kgf.cm)
45~47 N. m
(459~480 kgf.cm)
O9.52(3/8in)
O12.7(1/2in)
O15.9(5/8in)
R0.4~0.8
45 2
90 4
A
o
o
0.016~0.031in
Capacity
(Btu/h)
The type of modelsMax.allowable
piping length
15m/49.2ft
25m/82ft
25m/82ft
25m/82ft
9K ~12K
9K ~12K
9K ~12K
9K ~12K
T1 condition
Split type air conditioner
R410A inverter
Split type air conditioner
T3 condition
(outdoor unit down)
T3 condition
(outdoor unit up)
Max.allowable
piping height
8m/26.2ft
10m/32.8ft
10m/32.8ft
15m/49.2ft
25m/82ft
30m/98.4ft
30m/98.4ft
30m/98.4ft
18K
18K
18K
18K
15m/49.2ft
20m/65.6ft
15m/49.2ft
20m/65.6ft
DO NOT mix anything other than the specified refrigerant, such as air, etc., inside the refrigerant
circuit.
Fig 5.1 Fig 5.2

Refrigerant Piping Installation
Page 13 mrcool.com
Cut exactly at
right angles.Remove burrs.
Fig 5.3
Outer diam.
(mm)
A(mm)
Max.
1.3
1.6
1.8
2.2
Min.
0.7
1.0
1.0
2.0
O6.35(1/4 in)
O9.52(3/8in)
O12.7(1/2in)
O15.9(5/8in)
Die
Copper pipe
A
Set exactly at the position shown below.
(in=mm/25.4)
Fig 5.4
Flare's inner surface
must be flaw-free
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Fig 5.5
5.2 Refrigerant Piping5.1 Flaring the pipe end
1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing downward
so that the chips do not enter the pipe. See Fig 5.3.
3. Put the flare nut on the pipe.
4. Flare the pipe. Set exactly at the position shown in
Fig 5.5.
5. Check that the flaring is properly made.
1. Coat the flare both inside and ouside with ether oil
or ester oil .
Coat here with ether
oil or ester oil
Fig 5.6
2. Align the centers of both flares and tighten the flare
nuts 3 or 4 turns by hand. Then tighten them fully
with the torque wrenches.
Torque
wrench
Flare nut
Piping
Union
Spanner
Fig 5.7
5.3 Installation of the throttle.
(For some models)
For ensuring throttled efficiency, please mount
the throttle as horizontally as possible. See Fig.
5.8 below and Fig. 5.9 on the next page.
CAUTION
Indoor
Indoor
Indoor
Outdoor
Outdoor
Outdoor
Fig. 5.8
Wrap the supplied anti-shock
rubber around the throttle
to reduce noise.

Refrigerant Piping Installation
Page 14mrcool.com
5.4 Purging air and checking gas leakage
Throttle
Liquid
pipe
Gas pipe
500mm/19.7in
Fig. 5.9
WARNING
DO NOT mix any substance other than the
specified refrigerant into the refrigeration cycle.
• When refrigerant gas leaks occur, ventilate the
room as soon as possible.
• The specified refrigerant should always be
recovered and never be released directly into
the environment.
• Use a vacuum pump for the specified
refrigerant. Using the same vacuum pump for
different refrigerants may damage the vacuum
pump or the unit.
• If using additional refrigerant, perform air
purging from the refrigerant pipes and indoor
unit using a vacuum pump, then charge
additional refrigerant.
• Use a hexagonal wrench (0.2in / 4mm) to
operate the stop valve rod.
• All refrigerant pipe joints should be tightened
with a torque wrench at the specified
tightening torque.
When piping work is completed, it is necessary to
purge the air and check for gas leakage.
1. Connect projection side of charging hose (which
comes from gauge manifold) to gas stop valve's
service port.
2. Full open gauge manifold's low-pressure valve (Lo) and
completely close its high-pressure valve (Hi)
(High-pressure valve subsequently requires no
operation.)
3. Do vacuum pumping and make sure that the
compound pressure gauge reads -0.1MPa
(-76cmHg).*1
4. Close gauge manifold's low-pressure valve (Lo) and
sop vacuum pump. (Keep this state for a few minutes
to make sure that the compound pressure gauge
pointer does not swing back.)*2
5. Remove caps from liquid stop valve and gas stop
valve.
6. Turn the liquid stop valve's rod 90 degrees
counterclockwise with a hexagonal wrench to open
valve. Close it after 5 seconds, and check for gas
leakage. Using soapy water, check for gas leakage
from indoor unit's flare and outdoor unit's flare and
valve rods. After the check is complete, wipe all soapy
water off.
7. Disconnect charging hose from gas stop valve's
service port then fully open liquid and gas stop valves.
(Do not attempt to turn valve rod beyond its stop.)
8. Tighten valve caps and service port caps for the liquid
and gas stop valves with a torque wrench at the
specified torques.
*1 Pipe length vs. Vacuum pump run time
*2 If the compound pressure gauge pointer swings back,
refrigerant may have water content or a loose pipe joint
may exists. Check all pipe joints and re-tighten nuts as
needed, then repeat steps 2) through 4).
Fig. 5.10
Pipe lengthUp to 15mMore than 15m
Not less than 15minNot less than 10 minRun time

Lore
Refrigerant Piping Installation
Page 15 mrcool.com
5.5 Additional Refrigerant Charge
5.6 Refrigerant Piping Work
• Refrigerant may only be charged after
performing the leak test and the vacuum
pumping.
• Check the type of refrigerant to be used on the
machine nameplate. Charging with an unsuitable
refrigerant may cause explosions and accidents,
so always ensure that the appropriate refrigerant
is charged.
• Refrigerant containers shall be opened slowly.
• Be sure to add the proper amount of additional
refrigerant. Failure to do so may result in
reduced performance.
CAUTION
Pipe length andrefrigerantamount:
Connective
pipe length
Less
than
More
than
Air purging
method
Use vacuum
pump.
Use vacuum
pump.
Additional amount of refrigerant to be charged
R410A: (Pipe length-7.5(25))x15g/m(0.16oz/ft)
Liquid side: 6.35mm
R410A: (Pipe length-7.5(25))x30g/m(0.32oz/ft)
Liquid side: 9.52mm
The outdoor unit is factory charged with refrigerant.
Calculate the added refrigerant according to the diameter
and the length of the liquid pipe of the outdoor
unit/indoor unit connection.
1. Caution on the pipe handling
• Protect the open end of the pipe against dust and
moisture.
• All pipe bends should be as gentle as possible. Use a pipe
bender for bending.
2. Be sure to insulate both the gas and liquid piping.
Use separate thermal insulation pipes for gas and
liquid refrigerant pipes. See the figure below.
3. Finally, insulate as shown in the figure below.
Wall
Fig. 5.11
Rain
Be sure to
place a cap
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wire
Liquid pipe
Liquid pipe
insulation
Drain hose
Finishing tape
Gas pipe
insulation
Gas pipe
Indoor Unit
Clamps
Insulation for
liquid pipe fitting
Liquid pipe
Gas pipe Insulation for
gas pipe fitting
• For local insulation, be sure to insulate local
piping all the way into the pipe connections
inside the unit. Exposed piping may cause
condensation or may cause burns when touched.
• Make sure that no oil remains on plastic parts of
the decoration panel (optional equipment). Oil
may cause degradation and damage to plastic
parts.
CAUTION
1 6 6 4 5
32
A C B
GAS PIPING
16 645
32
A C B
LIQUID PIPING
Piping Insulation Procedures
1- Piping insulation material(field supply)
2- Flare nut connection
3- Insulation for fitting (field supply)
4- Piping insulation material (main unit)
5- Indoor unit
6- Clamp (field supply)
A- Turn seams up
B- Attach to base
C- Tighten the part other
than the piping
insulation material
Fig. 5.12
Fig. 5.13
Fig. 5.14

Additional Refrigerant Charge
6.1 Installation of drain piping
Install the drain piping as shown in figure below
and take measures against condensation.
Improperly rigged piping could lead to leaks and
eventually wet furniture and belongings.
6.3 How to perform piping
1-1.5mHanging bar
≥ 1/100 gradient
3~5ft
Connecting The Drain Pipe 6
Page 16
mrcool.com
6.2 Install the drain pipes
• Keep piping as short as possible and slope it
downwards at a gradient of at least 1/100 so
that air may not remain trapped inside the pipe.
• Keep pipe size equal to or greater than that of
the connecting pipe (PVC pipe, nominal
diameter 20mm in, outside diameter 25mm).
• Push the drain hose as far as possible over the
drain socket, and tighten the metal clamp
securely.
• Insulate the drain hose inside the building.
• If the drain hose cannot be sufficiently set on a
slope, fit the hose with drain raising piping (field
supply).
• Make sure that heat insulation work is executed
on the Indoor drain pipe and the drain socket
to prevent any possible water leakage due to
dew condensation.
• Connect the drain hose to the drain raising pipes, and
insulate them.
• Connect the drain hose to the drain outlet on the
indoor unit, and tighten it with the clamp.
1 2 3 4
1 - Drain socket (attached to the unit)
2 - Metal clamp
3- Drain hose
4 - Insulation (field supply)
Fig. 6.2
Fig. 6.3
Fig. 6.1
0~75
5
1~1.5m
300/11.8in
220/8.7in
750/29.5in
0~3in
530/20.9in
3~5ft
Ceiling Slab
Drain
raising pipe
Drain
hose
Metal
clamp
Adjustable
range
Hanger
bracket

Page 17 mrcool.com
Connecting the Drain Pipe
• Install the drain raising pipes at a height of less than 20.9in / 530mm.
• Install the drain raising pipes at a right angle to the indoor unit and no more than 11.8in / 300mm
from the unit.
• To prevent air bubbles, install the drain hose level slightly tilted up (<3in / 75mm).
• The incline of drain hose should be 3in / 75 mm or less so that the drain socket does not have to
withstand additional force.
• To ensure a downward slope of 1:100, install hanging bars every 3.3ft / 1m to 4.9ft / 1.5m.
• When unifying multiple drain pipes, install the pipes as shown in figure below. Select converging
drain pipes whose gauge is suitable for the operating capacity of the unit.
• Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia in
the sewage might enter the indoor unit through the drain pipes and corrode the heat exchanger.
• Keep in mind that it will become the cause of getting drain pipe blocked if water collects on drain
pipe.
CAUTION
0-530
100
T-Joint converging drain pipes
T-Joint converging drain pipes
Unit: mm
Fig. 6.4
Fig. 6.5
6.4 Testing of drain piping
After the piping work is finished, check if drainage flows
smoothy.
Add approximately 1L of water gradually through the
air discharge outlet. Method of adding water (see the
figure below).
100/3.9in
Fresh air intake ( 65/2.6in)
106/4.2in
106/4.2in
75/3in
65/2.6in
Unit: mm
When electric wiring work is finished, check
drainage flow during COOL running, explained in
"Test operation".
Plastic watering
can(tube should
be about 3.9in /
100mm long)
Water receiver

Electrical Wiring Work 7
Page 18
mrcool.com
1 Control box lid
2 Wiring diagram label
3 Power supply terminal block
4 Clamp for wiring
5 Wiring between units
6 Plastic cover
7 Clamp (field supply)
12
4
5
6
3
7
• All field wiring and components must be installed by a licensed electrician and must comply with relevant European
and national regulations.
• Use copper wire only.
• Follow the 'Wiring diagram' attached to the unit body to wire the outdoor unit, indoor units and the remote
controller.
• A circuit breaker capable of shutting down power supply to the entire system must be installed.
• Note that the operation will restart automatically if the main power supply is turned off and then turned back on
again.
• Be sure to ground the air conditioner.
DO NOT connect the ground wire to gas pipes, water pipes, lightning rods, or telephone ground wires.
CAUTION
• Gas pipes: might cause explosions or fire if gas leaks.
• Water pipes: no grounding effect if hard vinyl piping is used.
• Telephone ground wires or lightning rods: might cause abnormally high electric potential in the ground
during lightning storms .
The specification of power
PhaseFrequency and voltCircuit breaker/Fuse(A)
9K~18K1Phase208-240V20/16
Model
Power
How to connect wiring
• Remove the control box lid of
the indoor unit.
• Remove the cover of the
outdoor unit.
• Follow the "Wiring diagram
label" attached to the indoor
unit's control box lid to wire the
outdoor unit, indoor unit and
the remote control. Securely fix
the wires with a field supplied
champ.
• Attach the cover of the
outdoor unit.
Fig. 7.1

Page 19 mrcool.com
Electrical Wiring Work
1. Observe the notes mentioned below when wiring to the power supply terminal board.
• When connecting wires of the same gauge, connect them according to Fig 7.2 below.
• Use the specified electric wire. Connect the wire securely to the terminal. Lock the wire down without applying
excessive force to the terminal. (Tightening torque: 1.31N.m 10%).
• When attaching the control box lid, make sure not to pinch any wires.
• After all wiring connections are done, fill in any gaps in the casing wiring holes with putty or insulation material
(field supply) thus to prevent small animals or dirt from entering the unit from outside and causing short circuits in
the control box.
2. DO NOT connect wires of different gauge to the same grounding terminal. Looseness in the connection may
deteriorate the protection.
3. Use only specified wires and tightly connect wires to the terminals. Be careful that wires do not place external stress
on the terminals. Keep wiring in neat order so that they do not obstruct other equipment such as popping open the
service cover. Make sure the cover closes tight. Incomplete connections could result in overheating, and in the worst
case, electric shock or fire.
Cover
Bolts
Fig. 7.2
Fig. 7.3