Connecting The Piping; How To Connect Wiring To The Terminals - Friedrich MS24Y3F Installation Instruction Sheet

3

CONNECTING THE PIPING

WARNING
Do not use the existing piping and flare nuts.
• If the existing materials are used, the pressure inside the
refrigerant cycle will rise and cause breakage, injury, etc.
(Use the special R410A materials.)
CAUTION
(1) Do not use mineral oil on flared part.
Prevent mineral oil from getting into the system as this
would reduce the lifetime of the units.
(2) Never use piping which has been used for previous
installations. Only use parts which are delivered with
the unit.
(3) While welding the pipes, be sure to blow dry nitrogen
gas through them.
1. FLARING PROCESSING
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and
remove the burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor
and outdoor units respectively) onto the pipe and perform the flare
processing with a flare tool.
Use the special R410A flare tool, or the conventional flare tool.
When using the conventional flare tool, always use an allowance ad-
justment gauge and secure the A dimension shown in table.
Check if [L] is flared uniformly
and is not cracked or scratched.
Die
L
Pipe outside diameter
Pipe outside A
diameter Flare tool for R410A, clutch type
6.35 mm (1/4 in.)
9.52 mm (3/8 in.) 0 to 0.5 mm
12.7 mm (1/2 in.) (0 to 0.0197 in.)
15.88 mm (5/8 in.)
2. 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 150 mm (6") 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.
3. CONNECTION PIPES
(1) Centering the pipe against port on the indoor unit, turn the flare nut
with your hand.
Be sure that the small pipe is completely installed before connecting
the large the pipe.
Indoor unit side
Optional parts
CAUTION
Be sure to apply the pipe against the port on the indoor
unit correctly. If the centering is improper, the flare nut
cannot be tightened smoothly. If the flare nut is forced to
turn, the threads will be damaged.
(2) Install the outdoor unit wall cap (supplied with the optional installation
set or procured at the site) to the wall hole pipe.
(3) Connect the outdoor unit and indoor unit piping.
(4) 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.
Tighten with two wrenches.
Wrench (fixed)
Flare nut
Torque wrench
Indoor unit Connection pipe
A
pipe
Pipe
Flare nut tightening torque
Flare nut Tightening torque
6.35 mm (1/4 in.) dia. 16 to 18 N·m (160 to 180 kgf·cm)
9.52 mm (3/8 in.) dia. 30 to 42 N·m (300 to 420 kgf·cm)
12.7 mm (1/2 in.) dia. 49 to 61 N·m (490 to 610 kgf·cm)
15.88 mm (5/8 in.) dia. 63 to 75 N·m (630 to 750 kgf·cm)
Do not remove the cap from the connection pipe before connecting
the pipe.
CAUTION
Be sure to connect the large pipe after connecting the small
pipe completely.
4. HEAT INSULATION ON THE PIPE JOINTS
(INDOOR SIDE ONLY)
Put coupler heat insulator on the joints (indoor side only).
No gap
Coupler heat
insulator
(large)
Large pipe
To prevent gas leakage,
coat the flare surface with
alkylbenzene oil (HAB).
Do not use mineral oil.
4
HOW TO CONNECT WIRING
A. For solid core wiring
Indoor unit
(1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip
the insulation to about 25 mm (15/16") of expose the solid wire.
(2) Using a screwdriver, remove the terminal screw(s) on the terminal
board.
(3) Using pliers, bend the solid wire to form a loop suitable for the
terminal screw.
(4) Shape the loop wire properly, place it on the terminal board and
Coupler heat
tighten securely with the terminal screw using a screwdriver.
insulator (small)
B. For strand wiring
Be sure to overlap
the insulation
(1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip
the insulation to about 10 mm (3/8") of expose the strand wiring.
(2) Using a screwdriver, remove the terminal screw(s) on the terminal
Small pipe
board.
(3) Using a round terminal fastener or pliers, securely clamp a round
terminal to each stripped wire end.
(4) Position the round terminal wire, and replace and tighten the ter-
minal screw using a screwdriver.
No gap
Coupler heat
insulation
Wire
TO THE TERMINALS
Round
A. Solid wire B. Strand wire
terminal
Loop
Insulation
Screw with
special washer
Screw with
Round terminal special washer
Terminal Round
board terminal
Wire
- Continued on back -