Refrigerant Level Control Screen; Figure 13 - Refrigerant Level Control Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

REFRIGERANT LEVEL CONTROL SCREEN

FIGURE 13 - REFRIGERANT LEVEL CONTROL SCREEN

OVERVIEW
This screen displays a cutaway view of the chiller con-
denser, along with the liquid refrigerant level sensor
and the flow control valve. All setpoints relating to
the liquid level control are maintained on this screen.
Through animation, the variable orifice position is dis-
played. In addition, the refrigerant flow control valve
(variable orifice) can be manually operated.
Requires a login access level of SERVICE.
Service Technicians refer to the OptiView
Control Center - Service Instructions
(Form 160.76-M1) for operation instruc-
tions and explanation of all programmable
setpoints and displayed values.
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
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
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.
Subcooler Effectiveness
The Subcooler Effectiveness is evaluated with the
following calculation and compared to a hi 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 bythe PID loop.
This read box displays the remaining seconds until PID
control.
LD19451
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