48/50PD
CONTROL BOX
AND
COMPRESSOR
ELECTRICAL
OPTIONS PANEL
INDOOR MOTOR
ACCESS DOOR
OUTDOOR AIR
SCREEN (HIDDEN)
CONDENSER COIL
ACCESS PANEL
GAS SECTION
ACCESS
FILTER ACCESS DOOR
BASEPAN CONNECTIONS
ACCESS PANEL
C07002
Fig. 4 - Panel and Filter Locations
On
IMPORTANT: Indoor or outdoor fan rotation direction may not indicate proper input power phase sequence, as some
To correct the wrong compressor rotation direction, perform the following procedure:
1.Turn off power to the unit and lock out the power.
2.Switch any two of the incoming unit power leads.
3.Turn on power to the unit.
4.Verify corrected compressor rotation.
Power Supply
All
Internal Wiring
Check all electrical connections in unit control boxes; tighten as required.
Evaporator Fan
Fan belt and variable pulleys are
limits, evaporator fan motor specifications, FIOP static pressures, and fan RPM for various motor pulley settings. Appendix C and D are based on 100% fan speed (VFD at 60Hz). To alter fan performance, see Evaporator Fan Performance Adjustment in the Service section.
The Supply Fan Minimum Speed (Configuration→UNIT→FS.MN) and the Supply Fan Maximum Speed (Configuration→UNIT→FS.MX) can also be used to alter fan performance. The fan should run at the maximum fan speed when setting up the application design point. The unit is equipped with a Variable Frequency Drive (VFD). The VFD’s settings should not be used for adjusting fan performance. Specific VFD information can be found in Appendix B.
IMPORTANT: When setting up and starting the unit, the heating minimum CFM requirements must be upheld when changing belts, pulleys, and configurations. During heating mode, the fan speed is always set to Supply Fan Maximum Speed (FS.MX).
Condenser Fans and Motors
Condenser fans and motors are factory set. Refer to
Return-Air Filters
Check that correct filters are installed in filter tracks (see Physical Data table in Installation Instructions). Do not operate unit without
IMPORTANT: For units with
Outdoor-Air Inlet Screens
6