588104

Midea OASIS MSOH Manual

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Install the outdoor unit on a rigid base to prevent increasing noise level and vibration.
Determine the air outlet direction where the discharged air is not blocked.
In the case that the installation place is exposed to strong wind such as a seaside, make
sure the fan operating properly by putting the unit lengthwise along the wall or using a dust
or shield plates.
Specially in windy area, install the unit to prevent the admission of wind. If need suspending
installation, the installation bracket should accord with technique requirement in the
installation bracket diagram. The installation wall should be solid brick, concrete or the same
intensity construction, or actions to reinforce, damping supporting should be taken.
The connection between bracket and wall, bracket and the air conditioner should be firm,
stable and reliable.
Be sure there is no obstacle which block radiating air.
Strong
wind
Strong
wind
Barrier
Incorrect
Correct
Seal
Drain joint
Base pan hole
of outdoor unit
(A)
(B)
The drain joint is slightly different according to the
different outdoor unit.
For the drain joint with the seal(Fig.A), first fit the seal onto
the drain joint, then insert the drain joint into the base pan
hole of outdoor unit, rotate 90 to securely assemble them.
To install drain joint as shown in Fig.B, insert the drain
joint into the base pan hole of outdoor unit until it remains
fixed with a clicking sound. Connecting the drain joint with
an extension drain hose (Locally purchased), in case of the
water draining off the outdoor unit during the heating mode.
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DRAIN JOINT INSTALLATION
OUTDOOR INSALLATION PRECAUTION
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REFRIGERANT PIPE CONNECTION
1. Cut a pipe with a pipe cutter.
2. Put flare nuts on pipe/tube having
completed burr removal and flare the pipe.
3. Firmly hold copper pipe in a die in the
dimension shown in the table below.
Align pipes to be connected.
Sufficiently tighten the flare nut with fingers,
and then tighten it with a spanner and torque
wrench as shown.
Excessive torque can break nut depending
on installation conditions.
Outer diam.
(mm)
A(mm)
Max.
Min.
6.35 1.3
0.7
9.52
1.6 1.0
12.7
1.8 1.0
12.7
16
1.8
2.2
1.0
2.0
Bar
Copper pipe
Clamp handle
Handle
Bar
"A"
Indoor unit tubing Flare nut Pipings
Outer
diam.
Tightening
torque(N.cm)
Additional tightening
torque(N.cm)
6.35mm
12.7mm
16mm
9.52mm
1500
(153kgf.cm)
1600
(163kgf.cm)
3500
(357kgf.cm)
4500
(459kgf.cm)
3600
(367kgf.cm)
4700
(479kgf.cm)
2500
(255kgf.cm)
2600
(265kgf.cm)
AIR PURGING AND TEST OPERATION
4
5
1. Remove the electrical control board cover from the outdoor unit by loosening the screw.
2. Connect the connective cables to the terminals as identified with their respective matched numbers
on the terminal block of indoor and outdoor units.
3. Secure the cable onto the control board with the cord clamp.
4. To prevent the ingress of water, form a loop of the connective cable as illustrated in the installation
diagram of indoor and outdoor units.
5. Insulate unused cords (conductors) with PVC-tape. Process them so they do not touch any electrical
or metal parts.
Cover
Screw
Terminal block of outdoor unit
Liquid side: 6.35mm
R22: (Pipe length-5)x30g/m
R410A: (Pipe length-5)x15g/m
Liquid side: 9.52mm:
R22: (Pipe length-5)x60g/m
R410A: (Pipe length-5)x30g/m
Connective pipe length
Less than 5m
More than 5m
Air purging method
Use vacuum pump
Additional amount of refrigerant to be charged
Open the valve stem until it hits against
the stopper. Do not try to open it further.
Securely tighten the valve stem cap with
a spanner or the like.
Valve stem cap tightening torque. See
Tightening torque table.
Flare nut
Stopper
Cap
Valve body
Valve stem
Use vacuum pump
For the R410A refrigerant model, make sure the refrigerant added into air conditioner is liquid
form in any cases.
When relocating the unit to another place, using vacuum pump to perform evacuation.
The indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated
to remove any noncondensables and moisture from the system.
Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test run has been completed.
Pipe length and refrigerant amount:
Outdoor
unit
Indoor
unit
Refrigerant
Packed valve
Flare nut
Gas side
Liquid side
A
C
D
B
1. Completely tighten the flare nuts, A, B, C, D, connect
the manifold valve charge hose to a charge port of the
packed valve on the gas pipe side.
2. Connect the charge hose connection to the vacuum
pump.
3. Fully open the handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After starting
evacuation, slightly loose the flare nut of the packed
valve on the gas pipe side and check that the air is
entering. (Operation noise of the vacuum pump changes
and a compound meter indicates 0 instead of minus)
5. After the evacuation is complete, fully close the handle
Lo of the manifold valve and stop the operation of the
vacuum pump.
Make evacuation for 15 minutes and more and check
5
that the compound meter indicates -76cmHg(-1.0x10 Pa).
O
6. Turn the stem of the packed valve B about 45 counter-
clockwise for 6~7 seconds after the gas coming out, then
tighten the flare nut again. Make sure the pressure display
in the pressure indicator is a little higher than the atmosphere
pressure.
7. Remove the charge hose from the Low pressure charge hose.
8. Fully open the packed valve stems B and A.
9. Securely tighten the cap of the packed valve.
Manifold valve
Compound meter
-76cmHg
Handle Lo
Handle Hi
Charge hose
Charge hose
Vacuum pump
Pressure gauge
Packed valve
Perform test operation after completing gas leak check at the flare nut connections and electrical
safety check.
Check that all tubing and wiring have been properly connected.
Check that the gas and liquid side service valves are fully open.
1. Connect the power, press the ON/OFF button on the remote controller to turn the unit on.
2. Use the MODE button to select COOL, HEAT, AUTO and FAN to check if all the functions works
well.
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3. When the ambient temperature is too low(lower than 17 C), the unit cannot be controlled by the
remote controller to run at cooling mode, manual operation can be taken. Manual operation is
used only when the remote controller is disable or maintenance necessary.
Hold the panel sides and lift the panel up to an angle until it remains fixed with a clicking sound.
Press the Manual control button to select the AUTO or COOL, the unit will operate under Forced
AUTO or COOL mode(see User Manual for details).
4. The test operation should last about 30 minutes.
Flaring
Tightening connection
1. Air purging
2. When using the Vacuum Pump
4. Test running
3. Safety and leakage check
A: Lo packed valve B: Hi packed valve
C and D are ends of indoor unit connection.
CAUTION
1. Soap water method:
Apply a soap water or a liquid neutral detergent on the indoor
unit connections and outdoor unit connections by a soft brush
to check for leakage of the connecting points of the piping. If
bubbles come out, it indicates that the pipes have leakage.
2. Leak detector
Use the leak detector to check for leakage.
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CONNECT THE CABLE TO THE OUTDOOR UNIT
CAUTION
1
Indoor unit
check point
D
B
C
A
Outdoor unit
check point
Cover
NOTE:
To indoor unit
To indoor unit
Power supply
Model A
Model B
Power supply
Oblique
Roughness
Burr
O
90
AUTO/COOLAUTO/COOL
Manual control button
Connect the indoor unit first, then the
outdoor unit.
Do not allow the piping to let out from the
back of the indoor unit.
Be careful not to let the drain hose slack.
Heat insulation should be done to the
extension drain hose of indoor unit.
Be sure that the drain hose is located at
the lowest side of the bundle. Locating at
the upper side can cause drain pan to
overflow inside the unit.
Never intercross nor intertwist the power
wire with any other wiring.
1. Pass the piping through the hole in the wall.
2. Hook the indoor unit onto the upper portion
of installation plate(Engage the indoor unit with
the upper edge of the installation plate). Ensure
the hooks are properly seated on the installation
plate by moving it in left and right.
3. Piping can easily be made by lifting the indoor
unit with a cushioning material between the
indoor unit and the wall. Get it out after finish
piping.
4. Press the lower left and right side of the unit
against the installation plate until hooks
engages with the their slots.
CAUTION
Indoor unit installation
1. For the left-hand and right-hand piping,
remove the pipe cover from the side panel.
2. For the right back and left back piping,
install the piping as shown.
NOTE:
3. Bundle the tubing, connecting cable, and
drain hose with tape securely, evenly as
shown in Figure on the right.
For 9K/12K model, there is only one
side drainage structure design. For 18k
model, one side drainage structure is standard.
Both sides drainage structure is optional
and can only be customized from factory.
For both sides drainage structure, it can be
choosen for right, left or both sides drainage
connection. If choosing both sides drainage
connection, another proper drain hose is
needed as there is only one drain hose offered
by factory. If choosing one side drainage
connection, make sure the drain hole on the
other side is well plugged. The connection of
the drain hose is supposed to be done by
qualified installer in case of water leakage.
Connective pipe installation
Because the condensed water from rear
of the indoor unit is gathered in ponding
box and is piped out of room. Do not put
anything else in the box.
I
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NOTE:
Connective pipe length will affect the capacity and energy efficiency of the unit. The
nominal efficiency is tested basing on the pipe length of 5 meters.
2


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