Carrier DLFSOAH Installation Instructions Manual page 15

DLFSOAH: Installation Instructions
Step 4 - Connect The Pipes
Connect the copper pipes to the indoor unit first, then connect them to the
outdoor unit. Connect the low pressure pipe then the high pressure pipe.
1. When connecting the flare nuts, apply a thin coat of refrigeration oil to
the flared ends of the pipes.
2. Align the center of the two pipes to connect.
indoor unit tubing
Fig. 28 — Align the Pipes
3. Tighten the flare nut as tight as possible by hand.
4. Use an adjustable wrench, grip the nut on the unit tubing.
5. While firmly gripping the nut, use a torque wrench to tighten the flare
nut according to the torque values in Table 9 on page 14.
NOTE: Use an adjustable wrench and a torque wrench when
connecting or disconnecting pipe to or from the unit.
Fig. 29 — Torque fittings
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
pipe
flare nut
15
CAUTION
Be sure to wrap the insulation around the piping. Direct contact
with the bare piping may result in burns or frostbite.
Ensure the pipe is properly connected. Over-tightening may
damage the bell mouth and under tightening may lead to leakage.
NOTE: Carefully bend the tubing in the middle. DO NOT bend the
tubing more than 90 degrees or more than three times.
6. After connecting the copper pipes to the indoor unit, wrap the power
cable, signal cable and the piping together with binding tape.
NOTE: DO NOT intertwine the signal cable with other wires. While
bundling these items do not intertwine or cross the signal
cable with any other wiring.
7. Thread this pipeline through the wall and connect it to the outdoor unit.
8. Insulate all the piping, including the outdoor unit valves.
9. Secure the tubing cover (supplied in Accessories box) to the indoor unit
by a screw.
ST4.8*12 screw
Fig. 30 — ST4.8#12 Screws
10. Open the stop valves of the outdoor unit to start the refrigerant flow
between the indoor and outdoor unit.
CAUTION
Ensure there is no refrigerant leak after installation completion.
If a leak exists, ventilate the area immediately and evacuate the
system.
NOTE:
Two ST4.8*12
screws are supplied,
one of which
is a spare.