Page 15
XP19 SERIES
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit. Close the manifold gauge valves.
7. Shut off the dry nitrogen cylinder and remove the
manifold gauge hose from the cylinder. Open the
manifold gauge valves to release the dry nitrogen from
the line set and indoor unit.
8. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line set
and indoor unit until the absolute pressure does not
rise above 500 microns (29.9 inches of mercury) within
a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
9. When the absolute pressure requirement above has
been met, disconnect the manifold hose from the
vacuum pump and connect it to an upright cylinder of
HFC−410A refrigerant. Open the manifold gauge valve
1 to 2 psig in order to release the vacuum in the line set
and indoor unit.
10. Perform the following:
A
Close manifold gauge valves.
B
Shut off HFC−410A cylinder.
C
Reinstall service valve cores by removing
manifold hose form service valve. Quickly install
core with core tool while maintaining a positive
system pressure.
D
Replace the stem caps and secure finger tight,
then tighten an additional one−sixth (1/6) of a turn
as illustrated in Figure 2.
Servicing Units Delivered Void of
Charge16
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HFC−410A refrigerant as listed
on unit nameplate into the system.
5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level.
If system dryness is not
verified, the compressor will fail in the future.
SHIPPED AS SHOWN ABOVE WITH TERMINAL CRIMPED TO BLUE
WIRE; USE TERMINAL OR CUT OFF TERMINAL AND SPLICE BLUE
WIRE WITH Y2 WIRE TO INDOOR UNIT.
BLUE WIRE
WITH CRIMPED
TERMINAL
DEFROST
BOARD
DETAIL
Y2 OUT
Figure 29. XP19 Wiring
