5
NOTE:
Before brazing, verify indoor piston size by checking
the piston kit chart packaged with indoor unit.
Leak Testing
(Nitrogen or Nitrogen-Traced)
To avoid the risk of fire or explosion, never use
oxygen, high pressure air or flammable gases for leak
testing of a refrigeration system.
WARNING
To avoid possible explosion, the line from the
nitrogen cylinder must include a pressure regulator
and a pressure relief valve. The pressure relief valve
must be set to open at no more than 150 psig.
WARNING
Pressure test the system using dry nitrogen and soapy water
to locate leaks. If you wish to use a leak detector, charge the
system to 10 psi using the appropriate refrigerant then use
nitrogen to finish charging the system to working pressure
then apply the detector to suspect areas. If leaks are found,
repa
ir them. After repair, repeat the pressure test. If no leaks
exist, proceed to system evacuation.
System Evacuation
Condensing unit liquid and suction valves are closed to con-
tain the charge within the unit. The unit is shipped with the
valve stems closed and caps installed.
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause
property damage, personal injury or death.
WARNING
NOTICE
THIS UNIT IS SHIPPED WITH A NITROGEN/HELIUM
HOLDING CHARGE ONLY. UNIT MUST BE
EVACUATED AND CHARGED PER INSTALLATION
INSTRUCTIONS WITH REFRIGERANT LISTED ON
SERIAL RATING PLATE.
UNITS SHIPPED WITH A HOLDING CHARGE ARE
INTENDED FOR COMPONENT REPLACEMENT
ONLY ON EXISTING SYSTEMS, AND NOT
INTENDED FOR USE IN NEW SYSTEMS OR NEWLY
CONSTRUCTED HOMES.
NOTICE
NOTICE
UNITS MUST ONLY BE USED AS REPLACEMENT
COMPONENTS FOR PRE-2010 INSTALLED
SYSTEMS.
NOTE:
Holding charge must be removed before brazing.
1. Openservice valves before attaching vacuum pump.
2. Connect the vacuum pump with 250 micron capability
to the service valves.
3. Evacuate the system to 250 microns or less using suc-
tion
and
liquid service valves. Using both valves is nec-
essary as some compressors create a mechanical seal
separating the sides of the system.
4. Close pump valve and hold vacuum for 10 minutes. Typi-
cally pressure will rise during this period.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9
10
LEAK(S)
PRESENT
MINUTES
V
AC
U
U
M
IN
MI
CR
O
N
S
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
•
If the pressure rises to 1000 microns or less and re-
mains steady the system is considered leak-free; pro-
ceed to startup.
•
If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or noncondensibles
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered check
for leaks as previously indicated and repair as neces-
sary then repeat evacuation.
•
If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as
necessary then repeat evacuation.
Refer to the Remote Condensing Unit Service Manual for
more detailed instructions on system evacuation, prelimi-
nary charge adjustment, and final charge adjustment.
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