Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 336

FDT ( N ) -H
(3) Hanging
¡ Arrange four sets of a hang bolt (M10 or M8) , a nut for it, a plain
washer and a spring washer on site.
When there is the ceiling
1. Make an 860 to 890 mm-square cutout on the ceiling.
Refer to the outside dimensions of packing cardboard container.
s Align the center of ceiling cutout and the center of unit.
2. Decide the hang bolt position 675×780 in the case of FDT(N)
258 ~ 508, and 430×680 in the case of FDT(N) 208.
3. Use four hang bolts and fix them so that each bolt can resist the
pull out load of 50kgf.
4. Decide the length of hang bolt to approx. 70mm above the ceil-
ing surface.
5. After hanging in the unit, fix the attached level gauge and secure
the height of unit.
6. Use a transparent hose filled with water to check the levelness of
unit. (The maximum allowable height difference between both
ends of unit is 3mm.)
Request
¡ For the hang bolt whose length exceeds 1.3m, use the M10 size
hang bolt and moreover combine a diagonal member to the hang
bolt for reinforcement.
(4) Drain Piping
(a) Drain piping should always be in a downhili grade (1/50~1/100) and avoid riding across and elevation or making traps.
¡Good piping
Suspension
bolts
Heat
insulation
(b) When connecting the drain pipe to unit, pay sufficient attention not to apply excess force to the piping on the unit side. Also,
fix the piping at a point as close as possible to the unit.
(c) For drain pipe, use hard PVC general purpose pipe VP-25
(I.D.1") which can be purchased locally. When connecting, in-
sert a PVC pipe end securely into the drain socket before tight-
ening securely using the attached drain hose and clamp.
Adhesive must not be used connection of the drain socket and
drain hose (accessory).
(d) When consturcting drain piping for several units, position the
common pipe about 100 mm below the drain outlet of each unit
as shown in the sketch. Use VP-30 (11/4") or thicker pipe for
this purpose.
(e) Be sure to provide heat insulation to hard PVC pipes of indoor
placement.
(f) Do not ever provide an air vent.
(g) The height of the drain head can be elevated up to a point 700
mm ablve the ceiling and, when an obstacle exists in the ceiling
space, elevate the piping to avoid the obstacle using an elbow
or corresponding gadget. When doing this, if the stretch for the
needed height is higher than 500 mm, the back-flow quantity of
drain at the event of interruption of the operation gets too much
and it may cause overflow at the drain pan. Therefore, make the
height of the drain pipe within the distance given in the sketeh
below.
(h) Avoid positioning the drain piping outlet at a place where gen-
eration of odor may be stimulated. Do not lead the drain piping
direct into a sewer from where sulfur gas may generate.
(i) The purpose of drain hose is to absorb minute discrepancy of
the unit or the drain piping occurred when they are installed.
Therefore, when it is bent intentionally or used under expanded
condition, it may be damaged and result in water leakage.
334
A downhill grade
of 1/100 or more
Refrigerant piping
Drain
Main
body
Level gauge
Hose
A
258~508 40~45
208 45~47
Adjust so that the level gauge surface and
the lower surface of ceiling are in matching.
Ceiling
member
¡Improper piping
Avoid riding across an elevation
Air vent
Keep free from traps
Stage
difference
part
Drain socket
Pipe cover (large)
[for insulation]
(accessory)
Main unit
Drain hose
(accessory)
Clamp
Adhesion
(accessory)
Drain socket
Pipe cover (small)
[for insuation]
(accessory)
Secure the elevation as high as possible
(approx. 100 mm)
A downhill grade of
VP30
1/100 or more
295~325 mm 100 mm or less
Drain hose
VP25 joint
(field purchased)
Hang bolt
Nut
Washer
Spring
washer
Indoor unit
Fix the level gauge in alignment
with this face of supply air grill.
Supply air grill
Level gauge (insulation)
Do not pipe under water
Drain hose
VP25 joint
(field purchased)
VP25
(field purchased)
Pipe cover
[for insuation]
(field purchased)