Connecting Tubing To The Outdoor Unit; Checking For Refrigerant Leakage; Evacuating Air From The Tubing And Indoor Unit; Opening The Service Valves For Operation - Fedders HFC1009N2F Installation And Operation Manual

Connecting tubing to the outdoor unit

• Align the center of the tubing and sufficiently tighten the
flare nut with fingers
• Tighten the flare nut with wrench
Do not overtighten the flare nut. This can damage the threads
and cause leakage.

Checking for refrigerant leakage

Only licensed HVAC professionals are permitted by law to
perform the operations below.
• Connect a manifold gauge to the outdoor unit gas line port
• Use dry nitrogen with trace refrigerant when checking for
leakage
• Open the low pressure valve of the manifold gauge until the
meter reads steady at about 150-200 psig (10.32-13.8 bar)
• Test for refrigerant leakage especially around the tubing
connections with a refrigerant-leak detector
• If leakage was found, retighten the connector with a torque
wrench and repeat the test
• Upon completion of the leak test, purge nitrogen
Evacuate air from the tubing and indoor unit
Connect vacuum pump to unit through manifold gauges.
It is necessary to remove all air from the refrigeration cycle, as
this air contains moisture, which may cause a malfunction or
reduce efficiency of the compressor.

Opening the service valves for operation

• Unscrew the caps on the 2-way and 3-way valves
• After all lines are installed and leak tested, set both the liquid
and gas line valves to fully open position with the Allen Key
for the unit operation, as shown in figure 18
• Reinstall the cap and torque to the specified
value as shown below
Flare nut size
1/4"
3/8"
1/2"
Restraining tubing
• Wrap the tubing connection to the unit with insulation and
seal it with tape
• You may connect additional drain hose. The end of the drain
outlet should not touch the ground.
• Wrap the connecting tubing, drain hose and wires with tape
from bottom to the top, and secure them to the wall as
shown in figure 19
CAUTION
WARNING
Torque (N.m.)
12.7 - 19.3
35.6 - 44.4
48.9 - 61.0

FINAL INSTALLATION

17 11
Ensure that all the tubing and wiring are
connected properly and securely, before turning
the power On.
18 11
Allen key
19 11
10
Liquid line
Suction line
CAUTION
Use allen key to
open fully for
unit operation
Cap
Clamp
Drain hose