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506270−01 05/09
Figure 28. Typical Wiring Diagram
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 from service valves. Quickly install
cores 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 1.
Servicing Units Delivered Void of Charge
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.
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