10. A jumper is installed between terminals 21 and 24 for normal operation. To check motor
rotation on initial start-up, the jumper may be removed and a momentary switch is installed
between terminals 21 and 24. Press the Start key on the display screen of the OptiView
TM
Control Panel. After initialization of the OptiView, jog the motor with the momentary switch.
Once proper rotation is obtained, replace the momentary switch with the jumper. The
momentary switch must have a minimum contact rating of 1 FLA, 10 LRA at 115 VAC.
CAUTION
A temporary momentary switch or jumper is the only connection permitted between terminals 21 and
24. Connections of any other devices to either terminals 21 or 24 may cause inadvertant compressor
start-up.
11. VSD is setup to trip at 105% FLA.
12. Contact rating is 5 A resistive at 250 VAC and 30 VDC, 2 A inductive (0.4 PF) at 250 VAC and 30
VDC.
13. Field connected control power supply is not required, as a factory installed transformer is
provided inside the Variable Speed Drive (VSD).
14. Maximum allowable current draw for the sum of all loads is 2 A holding, 10 A inrush.
15. Each 115 VAC field-connected inductive load, that is, the relay coil, motor starter coil, and
similar components, must have a transient suppressor wired in parallel with its coil, physically
located at the coil. Spare transient suppressors and control circuit fuses are supplied in a bag
attached to the green ground screw in lower left corner of the control panel.
Note: Drawing number: 035-26662-000 REV E, SHT. 4
Legend
Table 2: Wiring diagram legend
Label Description
10L 2T protector (346 V and 600 V units only)
1T Class 2 power supply transformer
2T Class 2 power supply transformer
3M Condenser pump motor starter
1R Compressor motor (K18 - located on I/O board)
1SW Safety stop switch
BATT Battery
CP Condenser pressure (provided by transducer)
EEV Electronic expansion valve
EP Evaporator pressure (provided by transducer)
FLA Full load amperes (compressor motor)
FU Fuse
Unit Wiring and Field Connections for YZ Centrifugal Chiller with Magnetic Bearing Controller8
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