Figure 54: Smart sensor system components location (shown on HYP0490, other models are
similar)
Callout Description
1 Smart sensor board mounted behind door rail
2 Smart sensors
Note: Model HYP1278A has two additional sensors located to the right of the fan upper
assembly.
OptiSpeed compressor drive and chiller operation (0490 and
0774 amp models)
When the chiller enters a start command, the OSCD is commanded to pre-charge, the Aux. power
devices are gradually turned on to slowly charge the DC Bus capacitors. This is called the pre-
charge period, which will last for 12-seconds. After the 12-second time period has expired, the AUX.
power devices are gated fully on. After precharge is complete the AUX. power device will remain
turned on for the duration of the run cycle. The OSCD logic board provides the turn on, and turn off
commands for the AUX. power devices.
The cooling fans and pumps will turn on after the pre-charge time is complete, and continue to run
until the rectifier is turned off.
YMC
2
Mod B with OptiView
™
Control Center
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