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# 504,465M
Do not use a compressor to evacuate a sys-
tem. Avoid deep vacuum operation. Extremely
low vacuums can cause internal arcing and
compressor failure. Danger of equipment
damage. Damage caused by deep vacuum
operation will void warranty.
WARNING
START-UP
the absolute zero of pressure. Absolute pressure in a
vacuum is equal to atmospheric pressure minus
vacuum pressure.
5. When the absolute pressure reaches 23mm of
mercury, close the manifold gauge valves, turn off the
vacuum pump, and disconnect the manifold gauge
center port hose from the vacuum pump. Attach the
manifold gauge center port hose to a nitrogen cylinder
with pressure regulator set to 150 psig 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.
6. 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.
7. 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 .5mm (500 microns) of mercury within
a 20-minute period after shutting off the vacuum
pump and closing the manifold gauge valves.
8. 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
R410A refrigerant. Open the manifold gauge valves to
break the vacuum in the line set and indoor unit.
Close manifold gauge valves and shut off R410A
cylinder and remove manifold gauge set.
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory and field-installed wiring for loose
connections.
3. Open liquid line and suction line service valves to
release refrigerant charge (contained in condensing
unit) into system. Replace and tighten caps. Use a
back-up wrench on the suction and liquid valves when
removing or replacing valve caps.
4. To open suction valve, remove hex cap and turn valve
stem fully open using an Allen (hex) wrench. To open
Mineral oils are not compatible with R410A. If
oil must be added, it must be a polyol ester oil.
IMPORTANT
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Refrigerant Charge Adjustment
* If line length is
greater than 20 ft.
, add this amount.
If line length is
less than 20 ft.
, remove this amount.
Table 3
liquid valve, remove cap and turn valve stem until it is
fully open.
NOTE:
When replacing valve caps, the caps should
be finger tight then tightened an additional 1/6 of a
turn.
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 equipment until the
power company has been consulted and the voltage
condition corrected.
6. Set thermostat for cooling demand, turn on power to
blower and close the condensing unit disconnect
switch to start.
7. Recheck unit voltage with unit running. Power must be
within range shown on unit nameplate. Check amper-
age draw of unit. Refer to unit nameplate for correct
running amps.
Charging
This system is charged with R410A refrigerant which
operates at much higher pressures than R22. the expan-
sion valve and liquid line drier provided with the unit are
approved for use with R410A. Do not replace them with
components designed for use with R22. This unit is NOT
approved for use with coils which include metering orifices
or capillary tubes.
Processing Procedure
Units are factory charged with the amount of R410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 20'
line set. For varying lengths of line set, refer to Table 3 for
refrigerant charge adjustment.
