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12
Multi-zone Heat Pump Condensing Units
9. Once certain of a good evacuation and
leak free joints, back-seat the valves
(counter-clockwise) to open and allow
factory charge to ll lines and indoor
unit.
11. Refer to Field Charging Charts to “ne
tune” the refrigerant charge to meet
your conditions.
10. Charge to proper weight, charge based
on feet of interconnect (table on next
page)
Note: Charging should be done with a
dial-a-charge or weighed in with a scale.
The units are delivered pre-charged with
refrigerant for the condenser coil and the
evaporator. Charging of the eld installed
piping is required. Refer to the refrigerant
charge table for the proper amount to be
added for the applications interconnect
piping. Unit service valves are solid brass,
for sweat connections.
IMPORTANT: All systems require eld
charge adjustments. Refer to the "Refrig-
erant Charge Tables" for proper weight
charge and to the supplied “Field Charging
Charts" for proper system pressures and
temperature at different outdoor condi-
tions. Superheat should be used for nal
system charge in cooling mode. Subcool
should be used for nal system charge in
heating mode.
RECAP OF COMPLETING
PIPING CONNECTIONS
Pressure test all eld installed piping and
the indoor air handler with nitrogen. Using
a suitable vacuum pump, evacuate the
tubing and indoor unit to 500 microns or
less, with service values remaining front
seated (closed).
Before releasing the refrigerant from the
condenser, be sure the manifold gauge set
is closed so as not to lose vacuum when
shutting down the pump.
Release refrigerant from the condensing
unit by back seating the service value. Al-
len wrenches are used to open the valve.
Replace valve caps. Be careful to not back
seat the valves past the snap flanges that
hold the valve core in place.
Refrigerant
R22
Refer to Refrigerant
Charge Table for
specied line charge.
MultI-zonE HEAt PuMP rEfrIgErAnt PIPIng InStAllAtIon