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PRODUCT DESIGN
WARNING
DO NOT EXCEED THE MAXIMUM OVERCURRENT
DEVICE SIZE SHOWN ON THE UNIT DATA PLATE.
All line voltage connections must be made through weather
proof fittings. All exterior power supply and ground wiring must
be in approved weather proof conduit. Low voltage wiring from
the unit control panel to the thermostat requires coded cable.
The unit transformer is connected for 230V operation. If the
unit is to operate on 208V, reconnect the transformer primary
lead as shown on the unit wiring diagram.
If it is necessary for the installer to supply additional line volt-
age wiring to the inside of the package unit, the wiring must
comply with all local codes. This wiring must have a minimum
temperature rating of 105°C. All line voltage splices must be
made inside the unit or heat kit control box.
EXPANSION VALVE (TXV) SYSTEM
SINGLE SPEED APPLICATION (APH1624-42)
1. Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line access fitting with adequate contact and insu-
late for best possible reading.
3. Check subcooling and superheat. Systems with TXV ap-
plication should have a subcooling and superheat within
the range listed on the chart.
a. If subcooling and superheat are low, adjust TXV then
check subcooling.
b. If subcooling is low and superheat is high, add charge
to raise subcooling then check superheat.
c. If subcooling and superheat are high, adjust TXV valve
then check subcooling.
d. If subcooling is high and superheat is low, adjust TXV
valve superheat and remove charge to lower the
subcooling.
The TXV should NOT be adjusted at light load conditions
55º to 60ºF, under such conditions only the subcooling
can be evaluated. This is because suction pressure is
dependent on indoor air flow, and wet bulb temperature.
NOTE: Do NOT adjust charge based on suction pressure unless
there is a gross undercharge.
4. Disconnect manifold set. Installation is complete.
16
TWO SPEED APPLICATION (APH1648 / APC1560)
Run the unit on low stage cooling for 10 minutes until
refrigerant pressures stabilize. Follow the guidelines and
methods below to check unit operation and ensure that
the refrigerant charge is within limits. Charge the unit on
low stage.
1. Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line access fitting with adequate contact and insu-
late for best possible reading.
3. Check subcooling and superheat. Two stage systems run-
ning on low stage with TXV application should have a
subcooling and superheat within the range listed on the
chart.
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