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FORM 160.72-O1 (810)
figure 10 -
INTERSTAGE VALVE SCREEN
overvieW
These screens display a cutaway view of the Interstage
Valves. All setpoints relating to Interstage Valve control
are maintained on this screen. Also, related Interstage
Valve control parameters are displayed for reference.
Through animation, the relative valve position is dis-
played. In addition, the valve can be manually operated.
displaY onlY
interstage valve position
Displays the position of the Interstage Valve over the
range of 0% (closed) to 100% (fully open). The valve
position is animated. When the actual position is 0%
to 19%, the valve is shown fully closed. When ac-
tual position is 20% to 39% the valve is shown 25%
open. When actual position is 40% to 59%, the valve is
shown 50% open. When actual position is 60% to 79%,
the valve is shown as 75% open. Positions greater than
79 % are shown as full open.
intercooler refrigerant Temperature
Displays the present refrigerant temperature in the in-
tercooler. If the sensor is present and enabled under
Options on the Configuration screen. The service ac-
cess level is required to enable/disable this display.
JOHNSON CONTROLS
inTersTage valve sCreen
intercooler pressure
Displays the present refrigerant pressure in the inter-
cooler.
evaporator pressure
Displays the present refrigerant pressure in the evapo-
rator.
differential pressure
A parameter that represents system differential, or
HEAD. It is calculated as (Intercooler pressure –
Evaporator pressure).
liquid injection solenoid a (led)
Indicates when the Liquid Injection Solenoid is ener-
gized.
interstage valve setpoint
Displays the control point pressure the valve will oper-
ate to maintain.
pulldown Time remaining
Displays the amount of time remaining from start for
pulldown before the Interstage valve control will mod-
ulate to maintain the interstage pressure setpoint.
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