Mitsubishi Electric FDT125VNVF Technical Manual page 220

⑤ Installation of indoor unit
Work procedure
1. Select the suspension bolt locations and the pipe hole location.
(1) Use enclosed paper pattern as a reference, and
drill the holes for the suspension bolts and pipe.
Decide the locations based on direct measurements.
※
(2) Once the locations are properly placed, the paper
pattern can be removed.
2. Install the suspension bolts in place.
3. Fix with 4 suspension bolts, which can endure load of 500N.
4. Check the measurements given at the right
gure for the length of the suspension bolts.
5. Fasten the hanging plate onto the suspension bolts.
<
When installed against a ceiling material,
Air supply
Suspension bolt
Fasten
at the
front
Unit
end of
Washer
an
(accessory)
elon-
gated
Hanging plate
※Double nuts
hole.
※Please fasten rmly with double nuts.
6. Install the unit to the hanging plate.
(1) Slide the unit in from front side to get it
hanged on the hanging plate with the bolts.
(2) Fasten the four xing bolts (M8: 2
each on the left and right sides) rmly.
(3) Fasten the two screws (M4: 1 each on
the left and right sides).
WARNINIG : Hang a side panel on from the
panel side to the rear side and
then fasten it securely onto
the indoor unit with screws.
To ensure smooth drain ow, install the unit with
※
a descending slope toward the drain outlet.
CAUTION : Do not give the reversed slope, which may cause water leaks.
⑥ Refrigerant 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 are nuts with the attached ones (JIS category 2), and reprocess the are parts.
・Do not use thin-walled pipes.
Use phosphorus deoxidized copper alloy seamless pipe (C1220T speci ed in JIS H3300) 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 R410A.
Using other refrigerant except 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 R410 refrigerant.
Work procedure
1. Remove the are nut and blind anges on the pipe of the indoor unit.
※Make sure to loosen the are nut with holding the nut on pipe side with a spanner and giving torque to the
nut with another spanner in order to avoid unexpected stress to the copper pipe, and then remove them.
(Gas may come out at this time, but it is not abnormal.)
Pay attention whether the are nut pops out. (as the indoor unit is sometimes pressured.)
2. Make a are on liquid pipe and gas pipe, and connect the refrigeration pipes on the indoor unit.
・When taking out the pipe to rear or top, install it together with the electric wire ⑧ ,
passing them through the attached cover.
・Seal clearances with putty, etc. to shut off dust.
※Bend the pipe with as big radius as possible and do not bend the pipe repeatedly.
In addition, do not twist and crush the pipes.
※Do a are connection as follows:
Make sure to loosen the are nut with holding the nut on pipe side with a spanner
and giving torque to the nut with another spanner in order to avoid unexpected
stress to the copper pipe, and then remove them.
When fastening the are nut, align the refrigeration pipe with the center of are nut, screw
the nut for 3-4 times by hand and then tighten it by spanner with the speci ed torque
mentioned in the table below. Make sure to hold the pipe on the indoor unit securely by a
spanner when tightening the nut in order to avoid unexpected stress on the copper pipe.
3. Cover the are connection part of the indoor unit with attached insulation material
after a gas leakage inspection, and tighten both ends with attached straps.
Make sure to insulate both gas pipes and liquid pipes completely.
※Incomplete insulation may cause dew condensation or water dropping.
4. 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.
Pipe diameter Tightening torque N·m
ø 6.35 14 to 18
ø 9.52 34 to 42
ø 12.7 49 to 61
ø 15.88 68 to 82
ø 19.05 100 to 120
Paper pattern
Ceiling
Hanging plate
Suspension bolt
> < >
No ceiling material to install against,
Suspension bolt
Hanging plate
Nut
Washer
Unit
Ceiling surface
(accessory)
※Double nuts
Hanging plate
Screw for
hanging
plate (M4)
Fixing bolts
(M8)
(For left-side drain
connection, give the
reverse slope.)
Strap (Accessory) Pipe cover (Accessory)
The thickness of insulation should be 20mm or more.
⑥ Refrigerant pipe (continued)
The pipe can be connected from three different directions. (back, reight, top)
When the pipe is routed through the back.
If the bracket is removed, piping work will become easy.
※After piping, reinstall the removed bracket.
Bracket
When the pipe is routed through the back.
Cut the removed top cover, and install to
the rear panel instead of rear cover.
⑦ Drain pipe
The drain pipes may face out towards the back to the left, or to the right side.
Caution
Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause ood indoors and wetting the household goods,etc.
Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the
other harmful and
in ammable gas is generated. Toxic gas would ow into the room and
it would cause serious damage to user's health and safety (some poisoning or de ciency
of oxygen). In addition, it may cause corrosion of heat exchanger and bad smell.
Connect the pipe securely to avoid water leakage from the joint.
Insulate the pipe properly to avoid condensation drop.
Check if the water can ow out properly from both the drain outlet on the
indoor unit and the end of the drain pipe after installation.
Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap
in the midway. In addition, do not put air vent on the drain pipe. Check if water is drained out properly
from the pipe during commissioning. Also, keep suf cient space for inspection and maintenance.
Work procedure
1. Insert drain hose completely to the
base, and tighten the drain hose clamp
securely. ( adhesive must not be used.)
※ When plumbing on the left side, move the
rubber plug and the cylindrical insulating
materials by the pipe connecting hole on
the left side of the unit to the right side.
Beware of a possible out ow of water that may
occur upon removal of a drain plug.
2. Fix the drain hose at the lowest point with
a hose clamp supplied as an accessory.
※Give a drain hose a gradient of 10mm
as illustrated in the right drawing by
laying it without leaving a slack.
Take head of electrical cables so that
they may not run beneath the drain hose.
A drain hose must be clamped down with a hose clamp.
There is a possibility that drain water over ows.
3. Connect VP-20(prepare on site) to drain hose. (adhesive must not be used.)
※ Use commercially available rigid PVC general pipe VP-20 for drain pipe.
4. Do not to make the up-down bending and trap in the mid-way while assum-
ing that the drain pipes is downhill. (more than 1/100)
Never set up air vent.
5. Insulate the drain pipe.
Insulate the drain hose clamp with the heat insulation supplied as accessories.
When the unit is installed in a humid place, consider precautions against
dew condensation such as heat insulation for the drain pipe.
Drain test
After installation of drain pipe, make sure that drain system work in good
condition and no water leakage from joint and drain pan.
Do drain test even if installation of heating season.
219
- -
'12 • PAC-T-174
Pipe
Cut
Remove
Heat insulation material
Drain
socket
Drain hose (accessory) VP-20
(prepare on site)
Clamp (accessory)
Drain hose
Hose clamp
It can be attached
from both inside and
Lowest point
outside the unit.
No bumps
No traps
Not to be in water
To be a descending
angle