Midea DLFLDA, Installation Instructions Manual

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22 32801000302
Specifications subject to change without notice.
INSTALL ALL POWER, INTERCONNECTING
WIRING, AND PIPING TO INDOOR UNIT
1. Run interconnecting piping and wiring from the outdoor unit to
the indoor unit.
2. Connect wiring from outdoor unit per the connection diagram
(see Fig. 39 and Fig. 40).
3. Replace field wiring cover of the indoor unit.
Control box
Fig. 43
-
Control Box
4. Connect refrigerant piping and drain line outside of indoor unit.
Complete pipe insulation at flare connection then fasten the
piping and wiring to the wall as required. Completely seal the
hole in the wall.
5. Piping:
c. Cut the pipe, with a pipe cutter, at 90 degrees (see Fig. 44).
d. Remove the service connection, if provided with the unit.
Oblique
DŽ
90
Roughness Burr
A150767
Fig. 44 - Pipe Cutting
e. Remove all the burrs from the cut cross section of the pipe
avoiding any burrs inside the tubes.
f. Remove the flare nuts attached to the indoor and outdoor
units.
g. Install the correct size flare nut onto the tubing and make the
flare connection. Refer to Table 9 for the flare nut spaces.
Table 9—Flare Nut Spacing
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)
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
A150768
Fig. 45
-
Flare Nut Spacing
h. Apply a small amount of refrigerant oil to the flare
connection on the tubing.
i. Align center of the pipes and/or service valve.
Indoor unit tubing Flare nut Piping
A150769
Fig. 46 - Align Pipe Center
j. Connect both the liquid and gas piping to the indoor unit.
k. Tighten the flare nut using a torque wrench as specified in
Table 10.
Table 10—Tightening Torque
PIPE DIAMETER INCH (mm)
TIGHTENING TORQUE
Ft-lb N-m
Ø1 /4 ” ( 6 . 3 5) 10 to 13 13.6 to 17.6
Ø3 /8 ” (9.52) 24 to 31 32.5 to 42.0
Ø1 /2 ” ( 1 2. 7 ) 37 to 46 50.1 to 62.3
Ø 5/8 ” ( 1 5.88) 50 to 60 67.7 to 81.3
Flare nut
Copper tube
A150770
Fig. 47 - Tighten the Flare Nut
6. Connect the drain line. The drain line must not have a trap any-
where in its length, must pitch downwards, and must be insulat-
ed up to the outside wall.
NOTE: For applications where gravity cannot be used for drainage, a
condensate pump accessory is available. Consult the condensate pump
Installation Instructions for more information.