31-5000560 Rev. 5
21
Step 3 - Installation of the Outdoor Unit (Cont.)
Installation Instructions
F. System Evacuation
NOTE–
Do not open service valve.
•
Remove the suction line cap and attach a micron gauge
and vacuum pump. The port is 5/16”, an adapter may be
needed.
•
Evacuate the system to at least 350 microns.
•
Close the vacuum pump valve and check the micron
gauge. If the gauge rises above 150 microns in 60
seconds, the evacuation is incomplete or there is a leak
in the system. If the gauge does not rise above 150
microns in 60 seconds, the evacuation is complete.
•
Once evacuation is complete, remove the adapter and
hose connection from the suction line port and replaced
the cap.
E. Leak Test
Perform the following steps for EACH line set. The primary
service valve has a 5/16 port, an adapter may be necessary.
• Remove the cap on the service valve.
• Using a tank of dry nitrogen and approved regulator, charge
the system with 150 psig of dry nitrogen using mini-split
adapter to connect the valve.
• Check for leaks at the flare fittings using soap bubbles
or another detection device. If a leak is detected, make
repairs to the fittings and recheck. Proceed if no leaks are
detected within 3 minutes.
• Using the same tank/regulator, charge the system to
300 psig.
• Check for leaks as earlier. Proceed if no leaks are detected
within 3 minutes.
• Using the same tank/regulator, charge the system to
500 psig.
• Check for leaks as earlier. Keep system pressurized for at
least 20 minutes.
WARNING
Do not use acetylene, oxygen or
compressed air or mixtures containing air,
oxygen, or combustible gases for pressure testing. Do not
use mixtures of hydrogen containing refrigerant and air above
atmospheric pressure for pressure testing as they may
become flammable and could result in an explosion.
Refrigerant, when used as a trace gas, should only be mixed
with dry nitrogen for pressurizing units. Failure to follow
these recommendations could result in death or serious injury
as well as equipment or property damage.
D. Install Copper Lineset
•
Line set sizes are determined by the indoor unit. See
indoor spec for information. The outdoor unit ships with
port adapters to reduce or enlarge the flare port sizes
when needed. If connecting to 24K models with 3/8” & 5/8”
ports, adapters must be ordered separately..
•
Cut the line set to length.
•
Place nut over the pipe and then flare with the R-410A
flaring tool.
NOTE:
Follow standard practices for creating pipe flares.
When cutting and reaming the tubing, use caution to
prevent dirt or debris from entering the tubing. Remember
to place nut over the tubing before flaring.
•
To join the line set, directly align the tubing flare to the
fitting on the other pipe. Slide the nut onto the fitting and
hand tighten.
•
Torque the fittings according to the specifications shown in
the torque chart below.
Forced fastening without careful centering will damage the
threads and cause a refrigerant leak.
Pipe Diameter (ø)
Fastening torque
1/4”
18N.m/13.3Ft.lbs
3/8”
42N.m/30.1Ft.lbs
1/2”
55N.m/40.6Ft.lbs
5/8”
60 N.m/44.3Ft.lbs
•
Two wrenches are required to join the flare connection;
one standard wrench and one torque wrench adjusted to
the proper settings.
•
Repeat the process for attaching the
other end of the line set.
CAUTION
Half union
Flare nut
Torque wrench
Spanner
Indoor Unit
Outdoor Unit
)
itioned
Indoor Unit
If all indoor unit are
the outdoor units.
e el
di
If the outdoor unit is
than one or more indoor units.
(If lower than one or more indoor units.)
Outdoor Unit
Summary of Contents for ASH218JCDDA
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