Lennox 14HPX-018 Installation Instructions Manual page 12

A, WARNING
I
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 d
HFC-410A 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 HFC-410A cylinder and
remove the manifold gauge set,
,&,IMPORTANT
1. Check that fan rotates freely.
2, Inspect all factory and field-installed wiring for loose
connections.
NOTE - After the system has been evacuated and before
completing aft the remaining start-up steps, this is the ideal
time to adjust the amount of refrigerant made necessary by
line set length difference and by the specific indoor unit
matchup. Skip to the paragraph "Setup for Checking and
Adding Charge" on Page 13 to setup for charging and for
determine if charge is needed; adjust the charge accord-
ingly.
3, Open the liquid line and vapor line service valves
(counterclockwise) to release refrigerant charge (con-
tained in outdoor unit) into the system,
4, Replace stem caps and tighten finger tight; then tighten
per table 1 (on page 3),
5, Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start the equipment until the
power company has been consulted and the voltage
condition has been corrected.
6, Set the thermostat for a cooling demand, turn on pow-
er to indoor blower unit and close the outdoor unit dis-
connect to start the unit,
7, Recheck voltage while the unit is running. Power must
be within range shown on the nameplate,
This system is charged with HFC-410A refrigerant which
operates at much higher pressures than HCFC-22, The
recommended check expansion valve is approved for use
with HFC-410A. Do not replace it with a valve that is de-
signed to be used with HCFC-22. This unit is NOT ap-
proved for use with coils that include metering orifices or
capillary tubes,
The unit is factory-charged with the amount of HFC-410A
refrigerant indicated on the unit rating plate, This charge is
based on a matching indoor coil and outdoor coil with a 15
foot (4,6 m) line set. A blank space is provided on the unit
rating plate to list the actual field charge,
,& IMPORTANT
NOTE - Be sure that filters and indoor and outdoor coils are
clean before testing.
505243 04/08
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