12
Specifications subject to change without notice. IM-DHMSHA-02
INSTALL ALL POWER,
INTERCONNECTING WIRING, AND PIPING
TO THE INDOOR UNIT
1. Run interconnecting piping and wiring from the outdoor unit to the
indoor unit.
2. Run an interconnecting cable through the hole in wall (outside to
inside).
3. Lift the indoor unit into position and route piping and drain through
the hole in wall (inside to outside). Fit the interconnecting wiring
into the back side of the indoor unit.
4. Put an upper claw at the back of the indoor unit on the upper hook
of the mounting plate and move the indoor unit from side to side to
ensure it is securely hooked. See “Mounting Plate Dimensions” on
page 10 and Fig. 9 for reference.
5. Open the indoor unit’s front cover and remove the field wiring
terminal block cover.
6. Pull the interconnecting wire up from the back of indoor unit and
position close to the terminal block on the indoor unit.
7. Push the lower part of the indoor unit up on the wall, then move the
indoor unit from side to side, up and down to ensure it is hooked
securely (see Fig. 15).
Fig. 15 — Indoor Unit Installation
8. Connect the wiring from the outdoor unit per the connection
diagram (see Fig. 12 and Fig. 14).
9. Replace the field wiring cover and close the indoor unit’s front
cover.
10. Piping:
a. Cut the pipe, with a pipe cutter, at 90 degrees (see Fig. 16).
b. Remove the service connection (if provided with the unit).
Fig. 16 — Pipe Cutting
c. Remove all the burrs from the cut cross section of the pipe
avoiding any burrs inside the tubes.
d. Remove the flare nuts attached to the indoor and outdoor
units.
e. Install the correct size flare nut onto the tubing and make
the flare connection. Refer to Table 6 for the flare nut
spaces.
Table 6 — Flare Nut Spacing
Fig. 17 — Flare Nut Spacing
f. Apply a small amount of refrigerant oil to the flare
connection on the tubing.
g. Align the center of the pipes and/or service valve.
Fig. 18 — Align Pipe Center
h. Connect both the liquid and gas piping to the indoor unit
i.
Tighten the flare nut using a torque wrench as specified in
Table 7.
Table 7 — Tightening Torque
Fig. 19 — Tighten the Flare Nut
Upper hook
Lower hook
Oblique
90
Roughness
Burr
OUTER DIAM. (MM)
A (MM)
MAX.
MIN.
Ø 1/4” (6
.
35)
0.05 (1.3)
0.03 (0.7)
Ø 3/8” (9
.
52)
0.06 (1.6)
0.04 (1.0)
Ø 1/2” (12
.
7)
0.07 (1.8)
0.04 (1.0)
Ø 5/8” (15.88)
0.09 (2.2)
0.08 (2.0)
Brass Flare
Size
Recommended Seating
Torque for Brass Flare Nuts
N-m
Ø1/4
8-10 Ft. - Lbs.
10.8 to 13.6
Ø3/8
15-18 Ft. - Lbs.
20.3 to 24.4
Ø1/2
28-32 Ft. - Lbs.
38.0 to 43.4
Ø5/8
38-42 Ft. - Lbs.
51.5 to 56.9
Ø3/4
50-55 Ft. - Lbs.
68.0 to 74.6
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Indoor unit tubing
Flare nut
Piping
Flare nut
Copper tube
