KOMAC00607-09EN 65
High Saturated Condenser – Unload Value
High Cond Unload Value = Max Saturated Condenser Value – 3 degrees F
This function unloads the compressor whenever the pressure approaches within 3
degrees of the maximum discharge pressure. The purpose is to keep the compressor
online during periods of possibly temporary elevated pressures.
Light Load Stg Dn Point
The percent load point at which one of two operating compressors will shut off,
transferring the unit load to the remaining compressor.
Load Limit
An external signal from the keypad, the BAS or a 4-20 ma signal that limits the
compressor loading to a designated percent of full load. Frequently used to limit unit
power input.
Load Balance
Load balance is a technique that equally distributes the total unit load among the running
compressors on a unit or group of units.
Low Ambient Lockout
Prevents the unit from operating (or starting) at ambient temperatures below the
setpoint.
Low Pressure Unload Setpoint
The psi evaporator pressure setting at which the controller will unload the compressor
until a preset pressure is reached.
Low Pressure Hold Setpoint
The psi evaporator pressure setting at which the controller will not allow further
compressor loading.
Low/High Superheat Error
The difference between actual evaporator superheat and the superheat target.
LWT
Leaving water temperature. The “water” is any fluid used in the chiller circuit.
LWT Error
Error in the controller context is the difference between the value of a variable and the
setpoint. For example, if the LWT setpoint is 44°F and the actual temperature of the
water at a given moment is 46°F, the LWT error is +2 degrees.
LWT Slope
The LWT slope is an indication of the trend of the water temperature. It is calculated by
taking readings of the temperature every few seconds and subtracting them from the
previous value, over a rolling one minute interval.
ms
Milli-second
Maximum Saturated Condenser Temperature
The maximum saturated condenser temperature allowed is calculated based on the
compressor operational envelope.
OAT
Outside ambient air temperature
Offset
Offset is the difference between the actual value of a variable (such as temperature or
pressure) and the reading shown on the microprocessor as a result of the sensor signal.
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