Daikin WGZ030DW Operating And Maintenance Manual page 35

Evaporator Saturated Temperature
Evaporator saturated temperature is calculated from the evaporator pressure for each circuit.
R410a Evaporator Saturated Temperatures
When R410a refrigerant is selected the refrigerant pressure will be fitted to a curve made up of 24
straight-line segments. The accuracy of calculated saturated temperatures are less than +/- 0.5°F when
compared to standard look up tables for R410a.
R134a Evaporator Saturated Temperatures (Templifiers only)
When R134a refrigerant is selected the refrigerant pressure will be fitted to a curve made up of 12
straight-line segments. The accuracy of calculated saturated temperatures is +/- 0.5º F when compared to
standard look up tables for R134a refrigerant.
Condenser Saturated Temperature
Condenser saturated temperature shall be calculated from the condenser pressure for each circuit.
R410a Evaporator Saturated Temperatures
When R410a refrigerant is selected the refrigerant pressure will be fitted to a curve made up of 24
straight-line segments. The accuracy of calculated saturated temperatures are less than +/- 0.5°F when
compared to standard look up tables for R410a.
R134a Evaporator Saturated Temperatures (Templifiers only)
When R134a refrigerant is selected the refrigerant pressure will be fitted to a curve made up of 12
straight-line segments. The accuracy of calculated saturated temperatures is +/- 0.5º F when compared to
standard look up tables for R134a refrigerant.
Evaporator Approach
The evaporator approach is calculated for each circuit.
For R134a, R22, and R410A refrigerant the equation is:
Evaporator Approach = LWT – Evaporator Saturated Temperature
For R407c refrigerant the equation is:
Evaporator Approach = LWT – Evaporator Saturated Temperature + 4.0º F
Suction Superheat
Suction superheat is calculated for each circuit using the following equation:
Suction superheat = Suction Temperature – Evaporator Saturated (Dew for R407c)
Pumpdown Pressure
The pressure to which a circuit will pump down is based on the Low Evaporator Pressure Unload set
point. The equation is as follows:
Pumpdown pressure = Low evap pressure unload – 15 psi
The low limit for the calculated Pumpdown Pressure set point is 10.0 psi
Unit Enable
The Unit Enable Set Point controls enabling and disabling the unit. The Unit Enable Set Point has options
of OFF and ON. The Unit OFF input, Remote input, keypad entry, and BAS request can alter this set
point. The Control Source Set Point determines which sources can change the Unit Enable Set Point with
options of SWITCHES, KEYPAD or NETWORK.
OMM 1130-2
Temperature
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