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10
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 fill lines and indoor
unit.
Refrigerant
Refer to Refrigerant
Charge Table for
specified line charge.
S1CA
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11. Refer to
Field Charging Charts
to “fine
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.
S1CA
Shown
S2CA
Shown
The units are delivered precharged with
refrigerant for the condenser coil and the
evaporator. Charging of the field installed
piping is required. Refer to the refrigerant
charge table for the proper amount to be
added for the applications interconect pip-
ing. Unit service valves are solid brass, for
sweat connections.
IMPORTANT: All systems require field
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 final
system charge in cooling mode. Subcool
should be used for final system charge in
heating mode.
RECAP OF COMPLETING
PIPING CONNECTIONS
Pressure test all field 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 PIPING INSTALLATION SECTION
