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Evacuating the system of non--condensables is criti-
cal for proper operation of the unit. Non--condens-
ables are defined as any gas that will not condense
under temperatures and pressures present during
operation of an air conditioning system. Non--con-
densables such as water vapor, combine with refrig-
erant to produce substances that corrode copper pip-
ing and compressor parts.
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SRUWV DV IROORZV ORZ SUHVVXUH JDXJH WR YDSRU OLQH
VHUYLFH YDOYH KLJK SUHVVXUH JDXJH WR OLTXLG OLQH VHU
YLFH YDOYH
2-- Connect the vacuum pump (with vacuum gauge)
to the center port of the manifold gauge set.
3-- Open both manifold valves and start vacuum
pump.
4-- Evacuate the line set and indoor unit to an abso-
lute pressure of 23mm of mercury or approxi-
mately 1 inch of mercury. During the early stages
of evacuation, it is desirable to close the manifold
gauge valve at least once to determine if there is a
rapid rise in absolute pressure. A rapid rise in
pressure indicates a relatively large leak. If this oc-
curs, the leak testing procedure must be repeated.
NOTE -- The term absolute pressure means the to-
tal actual pressure within a given volume or sys-
tem, above the absolute zero of pressure. Abso-
lute 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 man-
ifold gauge center port hose from vacuum pump.
Attach the manifold 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 in-
door unit. Close the manifold gauge valves.
CAUTION
Danger of Equipment Damage.
Avoid deep vacuum operation. Do not use com-
pressors to evacuate a system.
Extremely low vacuums can cause internal arc-
ing and compressor failure.
Damage caused by deep vacuum operation will
void warranty.
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 pres-
sure does not rise above 5mm of mercury within a
20 minute period after shutting off the vacuum
pump and closing the manifold gauge valves.
8-- Depending on the equipment used to determine
the vacuum level, the following units are equiva-
lent to absolute pressure of 5mm of mercury:
5000 microns; 754 millimeters of mercury vacu-
um pressure; or 29.7 inches of mercury vacuum
pressure.
9-- When the absolute pressure requirement above
has been met, disconnect the manifold hose from
the vacuum pump and connect it to an upright
bottle of R22 refrigerant. Open the manifold gauge
valves to break the vacuum in the line set and in-
door unit. Close manifold gauge valves and shut
off R22 bottle and remove manifold gauge set.
67$5783
IMPORTANT
Crankcase heater should be energized 24 hours
before unit start--up to prevent compressor dam-
age as a result of slugging.
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 vapor line service valves
(counterclockwise) to release refrigerant charge
(contained in heat pump unit) into the system.
4- Replace stem caps and secure finger tight, then
tighten an additional (1/6) one--sixth 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 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
power to indoor blower coil and close heat pump
unit disconnect to start unit.
7- Recheck unit voltage with unit running. Power
must be within range shown on unit nameplate.
Check amperage draw of unit. Refer to unit name-
plate for correct running amps.
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The unit is factory charged with the amount of R-22
refrigerant indicated on the unit rating plate. This
charge is based on a matching indoor coil and out-
door coil with a 20 foot (6096 mm) line set. For vary-
ing lengths of line set, refer to table 2 for refrigerant
charge adjustment.
