Servicing Unit Delivered Void Of Charge; Electrical Connections - Lennox Merit Series13ACD Installation Instructions Manual

NOTE − A complete unit wiring diagram is located inside the unit control box cover.
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
HCFC−22 refrigerant. Open the manifold gauge valve
1 to 2 psig in order to release the vacuum in the line set
and indoor unit.
10. Close manifold gauge valves and shut off the
HCFC−22 cylinder and remove the manifold gauge
set.

Servicing Unit Delivered Void of Charge

If the system 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.
Figure 24. Typical Wiring Diagram
4. Evacuate the system again. Then, weigh the
5. Monitor the system to determine the amount of

Electrical Connections

Refer to the indoor unit installation instruction for additional
wiring application diagrams and refer to unit nameplate for
minimum circuit ampacity and maximum overcurrent
protection size. Figures 26 and 24 illustrate typical outdoor
unit wiring diagrams for the 13ACD series heat pumps.
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appropriate amount of HCFC−22 refrigerant as listed
on unit nameplate into the system.
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.
WARNING
Electric Shock Hazard. Can cause
injury or death.
Line voltage
components on units with single-pole
contactors, even when unit is not in
operation!
Unit may
supplies.
electric power
opening access panel.
Unit must be grounded in accordance
with national and local codes.
In the U.S.A., wiring must conform with current local
codes and the current National Electric Code (NEC).
is present at
have multiple power
Disconnect all remote
supplies before
13ACD SERIES
all