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SECTION 2 – OPTIVIEW CONTROL CENTER
FIGURE 8 - REFRIGERANT LEVEL CONTROL SCREEN
This screen displays a cutaway view of the chiller con-
denser, along with the liquid refrigerant level sensor
and variable orifice. Setpoints relating to the liquid
level control are maintained on this screen. Through
animation, the variable orifice position is displayed.
Also, the refrigerant flow control valve (variable ori-
fice) can be manually operated. It is only accessible
with a Service Level Password.
DISPLAY ONLY
Condenser Refrigerant Level
Displays the present position of the liquid level. The
refrigerant level is animated in the cutaway view of the
condenser. When the actual level is 0% to 15%, the
level is shown as 50% full. When the actual level is
16% to 31%, the level is shown as 60% full. When the
actual level is 32% to 47%, the level is shown as 70%
full. When the actual level is 48% to 63%, the level
is shown as 80% full. When the actual level is 64%
to 79%, the level is shown as 90% full. Actual levels
above 79%, are shown as 100% full.
R e q u i r e s a l o g i n a c c e s s l e v e l o f
SERVICE.
40
REFRIGERANT LEVEL CONTROL SCREEN
Subcooler Effectiveness
The Subcooler Effectiveness is evaluated with the fol-
lowing calculation and compared to a high and low
limit. (Cond Sat Temp-Drop Leg Ref Temp)/(Cond Sat
Temp-Entering Cond Liq Temp). This value is typi-
cally near 0.8 at design conditions.
Level Control State
Indicates one of the following states the level control
routine is in: Manual, Inactive, Startup Hold, Setpoint
Ramp, PID Control, Hold.
Startup Delay Remaining
The level valve is held at the starting position until
15 seconds after start to allow the system to stabilize.
Then the valve position is controlled by the PID loop.
This read box displays the remaining seconds until
PID control.
Level Control Valve Command
Indicates the valve command as a percentage of full
open. It is only displayed when the valve control method
is analog.
FORM 160.79-O3
ISSUE DATE: 11/09/2018
LD27847
JOHNSON CONTROLS
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