Page 19
XP21 SERIES
STEP 8 -- EVACUATION
Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are defined as any
gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non-
condensables and water suction combine with refrigerant to produce substances that corrode copper piping and com
pressor parts.
WARNING
Danger of Equipment Damage. Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely
low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void
warranty.
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
MANIFOLD
GAUGE SET
HFC-410A
RECOMMEND
MINIMUM 3/8” HOSE
A
Connect low side of manifold gauge set
with 1/4 SAE in-line tee to
vapor
line
service valve
B
Connect high side of manifold gauge
set to
liquid
line service valve
C
Connect micron gauge available
connector on the 1/4 SAE in-line tee.
D
Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port line
will be used later for both the HFC-410A
and nitrogen containers.
HIGH
LOW
NITROGEN
CONNECT GAUGE SET
A
B
C
D
LINE SET AND INDOOR COIL
NOTE — Remove cores from service valves (if not al
ready done).
FIGURE 18
