Reznor YDSA Unit Installation Manual - Manual (Page 25)

Form I-Y, P/N 273646R6, Page 25
7.2.3 3-phase Wiring Check
3-Phase Wiring Connection - There is a chance of unknowingly connecting
3-phase power in such a way as to cause compressor and blower rotation in
reverse. To prevent damage to the components, it is important to check this on
startup.
Before initial startup, connect refrigerant pressure gauges to the compressor suc-
tion and discharge lines. At startup, observe the gauges. If the suction pressure
rises and discharge pressure drops, the compressor is operating in reverse and
should be shut down.
( NOTE: After several minutes of operation in reverse, the compressor’s internal pro-
tector will trip. If compressors are repeatedly allowed to restart and run in reverse, the
compressors will be permanently damaged.)
If correction to 3-phase is required,
turn off the power. At the incoming power con-
nection, switch the 3-phase line voltage wiring connections before restarting the
unit. After startup, re-check the pressure gauges.
CAUTION: Connect pressure gauges to the suction and discharge
lines before startup so that compressor rotation can be checked
immediately. Scroll compressors will be destroyed if operated in
the wrong direction.
7.3 Wiring Diagram,
Unit Wiring
Requirements,
and Optional
Convenience
Electrical Outlet
Each unit has an order-specific custom wiring diagram in the control compartment. All
optional electrical components ordered with the unit are shown on the wiring diagram.
Codes for options ordered are listed across the bottom of the diagram. To identify
option codes, see list in APPENDIX, pages 68 thru 73.
Keep the wiring diagram and all manuals for future reference.
CAUTION: If any of the original wire as supplied with the appliance
must be replaced, it must be replaced with wiring material having
a temperature rating of at least 105°C.
Optional Convenience
Outlet, Option BC6
If the system was ordered with an electrically
independent 115V electrical outlet (Option BC6),
there is a factory-installed 115V outlet mounted
on a separate rail inside the electrical compart-
ment (not illustrated in FIGURE 18 on page 26).
This outlet requires a separate, field-supplied
115 volt power supply. Refer to FIGURE 19 on
page 28, for wiring entrance locations.
Optional Voltage Protection, Option PL4
If the system was ordered with Option PL4 (identified on the wiring diagram), it will
have a factory-installed phase loss/reversal and over/under voltage monitor.
The monitor will cause the controller to shut down the unit until the power condition is
corrected. This is an auto reset device and will reset when the power condition is cor-
rected.
7.2.2 Supply Voltage (cont’d)