Start Up - Lennox 10ACE Series Installation Instructions Manual

CAUTION
Danger of Equipment Damage.
Avoid deep vacuum operation. Do not use compres-
sors to evacuate a system. Extremely low vacuums
can cause internal arcing and compressor failure.
Damage caused by deep vacuum operation will void
warranty.
7. Shut off the nitrogen cylinder and remove the manifold
gauge hose from the cylinder. Open the manifold
gauge valves to release the 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 vac-
uum pump and connect it to an upright cylinder of
HCFC-22 refrigerant. Open the manifold gauge valves
to break the vacuum from 1 to 2 psig positive pressure
in the line set and indoor unit. Close manifold gauge
valves and shut off the HCFC-22 cylinder and remove
the manifold gauge set.

Start Up

IMPORTANT
If unit is equipped with crankcase heater, it should
be energized 24 hours before unit start−up to pre-
vent compressor damage as a result of slugging.
1. Rotate the fan to check for frozen bearings or binding.
2. Inspect all factory− and field-installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
vapor line service valves to release refrigerant charge
(contained in outdoor unit) into the system.
4. Replace the stem caps and secure finger tight, then
tighten an additional one-sixth (1/6) of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted the power company and the voltage
condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on pow-
er to the indoor blower and close the outdoor unit dis-
connect switch to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
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10ACE SERIES