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Light load conditions are signaled by measurement of the percentage of RLA amps by the MicroTech II controller.
When the RLA drops to the setpoint, the hot gas bypass solenoid valve is energized, making hot gas bypass available
for metering by the hot gas regulating valve. This hot gas provides a stable refrigerant flow and keeps the chiller
from short cycling under light load conditions. It also reduces surge potential on heat recovery units.
The factory setpoint for bringing on hot gas bypass is 40% of RLA.
Condenser Water Temperature
When the ambient wet bulb temperature is lower than design, the entering condenser water temperature can be
allowed to fall, improving chiller performance.
Daikin chillers will
start
with entering condenser water temperature as low as 55
F (42.8
C) providing the chilled
water temperature is below the condenser water temperature.
The minimum
operating
entering condenser water temperature is a function of the leaving chilled water temperature
and load. Even with tower fan control, some form of water flow control such as tower bypass must be used.
