Fedders hfc1009n2f Guida Al Funzionamento

10

•  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

Ensure that all the tubing and wiring are
connected properly and securely, before turning
the power On.

Drain hose

Clamp

•  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

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.

•  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

Torque (N.m.)

1/4”

12.7 - 19.3

3/8”

35.6 - 44.4

1/2”

48.9 - 61.0

Use allen key to
open fully for
unit operation

Allen key

Cap

Only licensed HVAC professionals are permitted by law to
perform the operations below.

•  Align the center of the tubing and sufficiently tighten the

flare nut with fingers

•  Tighten the flare nut with wrench

Liquid line

Suction line

Do not overtighten the flare nut. This can damage the threads
and cause leakage.

FINAL INSTALLATION