Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 148

⑤Installation of indoor unit
Work procedure
1. Prepare a hole of specified size on the ceiling.
2. Install suspension bolts at specified positions.
3. Make sure to use four suspension bolts.
4. Adjust the indoor unit position in order to fit with it.
5. Make sure to install the indoor unit horizontally. Confirm the levelness of the indoor unit with
a level gauge or transparent hose filled with water. Keep the height difference at both ends of
the indoor unit within 3mm.
6. Tighten four upper nuts and fix the unit after height and levelness adjustment.
Installation
[Hanging]
Hang the unit up.
Suspension bolt
M10 nut
Washer for M10
Unit
Spring washer for M10
Adjustment for horizontality
○Either use a level vial, or adjust the level according to the method below.
●Adjust so the bottom side of the unit will be leveled with the water surface as illustrated
below.
Pipe side
Pour water
Water
surface
0~5mm
Let the pipe side be slightly sloped.
○If the unit is not leveled, it may cause malfunctions or inoperation of the float switch.
⑥Duct work
① A corrugated board (for preventing sputtering) is attached to the main body of the air-conditioner
(on the outlet port). Do not remove it until connecting the duct.
●An air filter can be provided on the main body of the air conditioner (on the inlet port). Remove
it when connecting the duct on the inlet port.
② Blowout duct
●Use rectangular duct to connect with unit.
●Duct size for each unit is as shown below.
UNIT: mm
Single type 200, 250, 280
Multi type 224, 280
FDU-F 1800, 2400
B
A 1450
B 250
●Duct should be at their minimum length.
●We recommend to use sound and heat insulated duct to prevent it from condensation.
●Connect duct to unit before ceiling attachment.
③Inlet port
●When connecting the duct to the inlet port, remove the air filter if it is fitted to the inlet port.
●Inlet port size for each unit is as shown below.
UNIT: mm
Single type 200, 250, 280
Multi type 224, 280
FDU-F 1800, 2400
A 1450
B 250
●Make sure to insulate the duct to prevent dewing on it.
④Install the specific blowout duct in a location where the air will
circulate to the entire room.
●Conduct the installation of the specific blowout hole and the
connection of the duct before attaching them to the ceiling.
●Insulate the area where the duct is secured by a band for dew
condensation prevention.
⑤Make sure provide an inspection hole on the ceiling. It is indispensable to service electric
equipment, motor, functional components and cleaning of heat exchanger.
⑥Make sure to insulate ducts, in order to prevent dewing on them.
⑦Connect the duct with care not to touch the blower (fan motor) with fingers. Or, when inhaling
air directly from the suction side, install an air filter at the air suction inlet.
FDU FDUA
Air conditioner unit
A
Suction duct
Blow outlet
(marketed item)
Blowout duct
Inspection hole
(option or marketed item)
If the measurements between
the unit and the ceiling hole do
not match upon installation, it
may be adjusted with the long
holed installation tool.
Vinyl hose
A
A
Secure with a band, etc.
Blowout
duct
Detailed view of part A
(hanger, vibration proof)
Ceiling suriace
Suction hole
(marketed item)
(with air filter)
-
⑥Duct work (continued)
FDU-F
Air conditioner unit
Blow outlet
4
Blowout duct
2
(option or marketed item)
Bad example of duct work
①If a duct is not provided at the suction side but it is substituted with the space over the ceiling,
humidity in the space will increase by the influence of capacity of ventilation fan, strength of
wind blowing against the out door air louver, weather (rainy day) and others.
a)Moisture in air is likely to condense over the external plates of the unit and to drip on the
ceiling. Unit should be operated under the conditions as listed in the above table and within
the limitation of wind volume. When the building is a concrete structure, especially immedi-
ately after the construction, humidity tends to rise even if the space over the ceiling is not
substituted in place of a duct. In such occasion, it is necessary to insulate the entire unit with
glass wool (25mm). (Use a wire net or equivalent to hold the glass wool in place.)
b)It may run out the allowable limit of unit operation (Example: When outdoor air temperature
is 35°C DB, suction air temperature is 27°C WB) and it could result in such troubles as
compressor overload, etc..
c)There is a possibility that the blow air volume may exceed the allowable range of operation
due to the capacity of ventilation fan or strength of wind blowing against external air louver
so that drainage from be heat exchanger may fall to reach the drain pan but leak outside
(Example: drip on to the ceiling) with consequential water leakage in the room.
②If vibration damping is not conducted between the unit and the duct, and between the unit and
the slab, vibration will be transmitted to the duct and vibration noise may occur. Also, vibration
may be transmitted from the unit to the slab. Vibration damping must be performed.
Bad example of duct work
⑦Refrigerant pipe
Caution
●Use the new refrigerant pipe.
When re-using the existing pipe system for R22 or R407C, pay attention to the following items.
・Change the flare nuts with the attached ones, and reprocess the flare parts.
・Do not use thin-walled pipes.
●Use phosphorus deoxidized copper alloy seamless pipe (C1220T) for refrigeration pipe installation.
In addition, make sure there is no damage both inside and outside of the pipe, and no harmful
substances such as sulfur, oxide, dust or a contaminant stuck on the pipes.
●Do not use any refrigerant other than the designated refrigerant.
Using other refrigerant except R32 or R410A (R22 etc.) may degrade inside refrigeration oil. And air
getting into refrigeration circuit may cause over-pressure and resultant it may result in bursting, etc.
●Store the copper pipes indoors and seal the both end of them until they are brazed in order to avoid any dust, dirt or
water getting into pipe. Otherwise it will cause degradation of refrigeration oil and compressor breakdown, etc.
●Use special tools for R32 or R410A refrigerant.
●The indoor unit pipes allow the maintenance panel to be removed. Therefore, regardless of the
piping direction, there should be a straight section of 400 mm or more.
Work procedure
1. When brazing work, perform it while cool down around the brazing port with wet towels to
prevent the overheating.
2. After check the gas leak test, install the heat insulation (prepare on site) to the brazing port of
the indoor unit.
●Be sure to perform the heat insulation both of gas side piping with liquid side piping.
※If heat insulation does not install to the pipes, dew condensation may occurs and it may
cause the water leakage.
The thickness of the heat insulation should be more than 20mm.
3. Refrigerant is charged in the outdoor unit.
As for the additional refrigerant charge for the indoor unit and piping, refer to the installation
manual attached to the outdoor unit.
○The brazing port size of the indoor unit.
Single unit Liquid/Gas Size
Liquid piping 9.52
φ
Type 200
Gas piping 25.4
φ
Liquid piping φ 12.7
250
Type
280
Gas piping 25.4
φ
Please refer to the installation sheet of outdoor units for details.
※
147
-
'21 • PAC-SM-383
Outdoor air
Deep hood
6
3
Suction duct (Prepare on site)
(marketed item)
Wind capacity
7
Inspection hole
5
control damper
Louver to
outdoor air
For ventilation
Multi unit Liquid/Gas Size
Liquid piping 9.52
φ
Type 224
Gas piping 19.05
φ
Liquid piping φ 9.52
Type 280
Gas piping 22.22
φ
⑧
Ca
●
●
●
●
●
●
Wo
1.
○
2.
3.