FORM 145.16-IOM2 (0611)
JOHNSON CONTROLS 13
SAFETY CONTROLS
The microprocessor control monitors the following
inputs:
1. A suction line freezestat to protect against low
evaporator temperatures due to low water
supply temperatures opens at 35F leaving
water temperature.
2. A high-pressure switch to protect against
excessive discharge pressures.
3. A low-pressure switch to protect against loss
of refrigerant charge.
4. A Condensate Overflow Switch to protect
against condensate overflow.
Random Start
Random start function, upon power up, will
impose time delay of 4 minutes plus a random
delay of 1 to 64 seconds. The random number
generator seed is determined by a fixed seed
programmed at the factory combined with the
serial number, model number, and the hours of
compressor run time of the unit.
Compressor Protection
In addition to the external pressure switches, the
compressor also has inherent (internal)
protection. If there is an abnormal temperature
rise in a compressor, the internal protection will
immediately shut down the compressor. The
microprocessor control incorporates features to
minimize compressor wear and damage. An anti-
short cycle delay (ASCD) is utilized to prevent
short cycling of the compressor. Additionally, a
minimum run time is imposed any time a
compressor is energized. The ASCD is initiated
on unit start-up and on any compressor reset or
lockout.
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