Table of Contents
Advertisement
System Start-Up
Duty Cycle Calculations calculate the duty cycle based on the calculated
Load Value Fraction:
On Time
Seconds = 3600 / 4 X Max Cycle Rate X (1-Load Value Fraction)
Off Time
Seconds = 3600 / 4 X Max Cycle Rate X Load Value Fraction
Where Load Value Fraction = Fractional part of the calculated Load Value.
Sequence of Operation
Leaving Solution Reset (LSR)
Leaving Solution Reset (LSR) refers to the process of adjusting the Leaving
Solution Setpoint (LSS) based on an external temperature.
When the optional Leaving Solution Reset (LSR) feature is used, the CGM
will automatically adjust the LSS in response to a temperature change from
one of three different temperature sensor:
1. Zone Temperature sensor
2. Outside Air Temperature sensor
3. Entering Solution Temperature sensor.
The reset temperature value (Start Temperature), to start resetting the
Leaving Solution Setpoint (LSS) and the maximum amount of reset to be
applied to the LSS is programmable through the Human Interface. The reset
amount applied to the LSS is a linear calculation between the Start
Temperature and the End Temperature. After the reset amount has been
calculated, it is added to the Leaving Solution Setpoint to create the Leaving
Solution Reset Setpoint. If the solution temperature is above the selected
Start Temperature, the reset amount is zero. If the solution temperature is
below the End Temp, the maximum amount of reset is applied. For reset
type 'None', the amount of reset is zero. Refer to the appropriate reset type
in Table 8 for reset schedules.
56
CSRA-SVX02A-EN
Advertisement
Table of Contents
