Indoor Unit; Cutting The Hole In The Wall For The Connecting Piping; Installing The Wall Hook Bracket; Forming The Drain Hose And Pipe - Friedrich MW30C3F Installation Manual

INDOOR UNIT

CUTTING THE HOLE IN THE WALL FOR THE CONNECTING PIPING

(1) Cut a 3-1/8"(80 mm) diameter hole in the wall at the position shown in
the figure.
(2) When cutting the wall hole at the inside of the wall hook bracket, cut
the hole to a point of intersection of center marks.
When cutting the wall hole at the outside of the wall hook bracket, cut
the hole at a point of 10mm below.
(3) Cut the hole so that the outside end is lower (3/16" to 3/8" (5 to 10
mm)) than the inside end.
(4) Always align the center of the wall hole. If misaligned, water leakage
will occur.
(5) Cut the wall pipe to match the wall thickness, stick it into the wall cap,
fasten the cap with vinyl tape, and stick the pipe through the hole. (The
connection pipe is supplied in the installation set.)
(6) For left piping and right piping, cut the hole a little lower so that drain
water will flow freely.

INSTALLING THE WALL HOOK BRACKET

(1) Install the wall hook bracket so that it is correctly positioned horizon-
tally and vertically. If the wall hook bracket is tiled, water will drip to the
floor.
(2) Install the wall hook bracket so that it is strong enough to withstand
the weight of an adult.
G
Fasten the wall hook bracket to the wall with 6 or more screws through
the holes near the outer edge of the bracket.
G
Check that there is no rattle at the wall hook bracket.
WARNING
If the wall pipe is not used, the cord interconnecting
the indoor and outdoor units may touch metal and
cause electric leakage.

FORMING THE DRAIN HOSE AND PIPE

[Rear piping, Right piping, Bottom piping]
G Install the indoor unit piping in the direction of the wall hole and bind
the drain hose and pipe together with vinyl tape.
G
Install the piping so that the drain hose is at the bottom.
G
Wrap the pipes of the indoor unit that are visible from the outside with
decorative tape.
[For Left rear piping, Left piping]
Interchange the drain cap and the drain hose.
CAUTION
(1) In order to align the drain hose and drain cap, be
sure to insert securely and vertically. Incline inser-
tion will cause water leakage.
(2) When inserting, be sure not to attach any mate-
rial besides water. If any other material is attached,
it will cause deterioration and water leakage.
(3) After removing drain hose, be sure not to forget
mounting drain cap.
(4) Be sure to fix the drain hose with tape to the bottom
of piping.
(5) Prevent drain water frozen under low temperature
environment.
When installing indoor unit's drain hose outdoors, necessary
measure for frost protection should be taken to prevent drain
water frozen.
• Under low temperature environment (when outdoor tempera-
ture under 32 °F), after cooling operation is executed, water in
the drain hose could be frozen.
Once drain water is frozen, the drain hose will be blocked
and water leakage may be resulted for indoor unit.
Centering marks
Wall hook bracket
Lower
3-1/8"(80 mm)
hole
3-1/8"(80 mm)
Fasten with
hole
vinyl tape
3/16" to 3/8"(5 to 10 mm)
(Wall pipe)
(Wall cap)
(Inside) Wall (Outside)
Wall hook bracket
Leveling method
Hang weight
from here.
Tapping screw
(size: large; quantity: 8)
Wall hook
bracket
Weight
CAUTION
Install the wall hook bracket horizontally and perpen-
dicularly.
Bind with vinyl tape
Right piping
Pipe (top)
Rear piping
Bottom Indoor unit drain hose
(bottom)
piping
For left outlet piping, cut off the
piping outlet cutting groove
with a hacksaw.
Remove the drain cap by pulling
Indoor unit
at the projection at the end of
drain hose Drain cap
the cap with pliers, etc.
CAUTION CAUTION
Insert the drain hose and drain cap into the drain port, mak-
ing sure that it comes in contact with the back of the drain
port, and then mount it. If the drain hose is not connected
properly, leaking will occur.
• Attach the Insulation (Drain hose) to the drain hose.
Insulation (Drain hose)
Drain hose
G
For left piping and left rear piping, align the marks on the wall
hook bracket and shape the connection pipe.
G Bend the connection piping at the bend radius of 4"(100 mm) or
more and install no more than 1-3/8"(35 mm) from the wall.
G
After passing the indoor piping and drain hose through the wall
hole, hang the indoor unit on the hooks at the top and bottom of
the wall hook bracket.
Lower
[Installing the indoor unit]
G
Hang the indoor unit from the hooks at the top of the wall hook
bracket.
G Insert the spacer, etc. between the indoor unit and the wall hook
3/8" (10 mm)
bracket and separate the bottom of the indoor unit from the wall.
or over
Indoor unit
(Spacer)
Wall hook bracket
CONNECTING THE PIPING
CONNECTION
(1) Install the outdoor unit wall cap (supplied with the optional
installation set or procured at the site) to the wall pipe.
(2) Connect the outdoor unit and indoor unit piping.
String
(3) After matching the center of the flare surface and tightening
the nut hand tight, tighten the nut to the specified tightening
torque with a torque wrench.
FLARING
(1) Cut the connection pipe to the
necessary length with a pipe cut-
ter.
(2) Hold the pipe downward so that
cuttings will not enter the pipe
and remove the burrs.
(3) Insert the flare nut onto the pipe
and flare the pipe with a flaring
tool.
Insert the flare nut (always use the
flare nut attached to the indoor and
outdoor units respectively) onto the
pipe and perform the flare process-
ing with a flare tool.
Use the special R410A flare tool,
or the conv-entional (for R22) flare
tool.
When using the conventional flare
tool, always use an allowance ad-
justment gauge and secure the A di-
mension shown in the table.
BENDING PIPES
(1) When bending the pipe, be careful not to crush it.
(2) To prevent breaking of the pipe, avoid sharp bends.
Bend the pipe with a radius of curvature of 6" (150 mm) or
over.
(3) If the copper pipe is bend the pipe or pulled to often, it will
become stiff.
Do not bend the pipes more than three times at one place.
Alignment marks
Wall hook
bracket
Connection piping
Indoor unit
After hooking the indoor unit to the top hook, hook the fittings of the indoor
unit to the two bottom hooks while lowering the unit and pushing it against
the wall.
Tighten with two wrenches.
Wrench (fixed)
Flare nut
Torque
wrench
Connection pipe
Indoor unit pipe
Flare nut tightening torque and L dimension
Check if [L] is flared uniformly
and is not cracked or scratched.
Flare nut Tightening torque
21.70 to 30.38 ft•lbs
3/8" (9.52 mm) dia.
(300 to 420 kgf•cm)
46.5 to 55.3 ft•lbs
5/8" (15.88 mm) dia.
(630 to 750 kgf•cm)
Pipe outside diameter
Pipe outside
Die
Flash tool for
diameter
R410A, clutch type
A
ø 9.52 mm (3/8") 0 to 0.5
Pipe
ø 15.88 mm (5/8") 0 to 0.5
(1) Fasten a flare nut with a torque wrench as instructed in this manual. If
fastened too tight, the flare nut may be broken after a long period of time
and cause a leakage of refrigerant.
(2) During installation, make sure that the refrigerant pipe is attached firmly
before you run the compressor. Do not operate the compressor under the
condition of refrigerant piping not attached properly with 3-way valve open.
This may cause abnormal pressure in the refrigeration cycle that leads to
breakage and even injury.
Small piping
Large piping
Top hooks
Wall hook
bracket
(Fitting) Bottom hooks
To prevent gas leakage, coat the flare
surface with refrigerator oil.
L dimension
1.8 to 2.0mm
2.2 to 2.4mm
A (mm)
Conventional (R22) flare tool
Clutch type Wing nut type
1.0 to 1.5 1.5 to 2.0
1.0 to 1.5 1.5 to 2.0
CAUTION