Refrigerant Level Control Screen - York YK Style H Operation Manual

Refrigerant level control screen

Figure 32: Refrigerant level control screen (analog actuator)
This screen displays a cutaway view of the chiller condenser, 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 displayed. In addition, the refrigerant
flow control valve (variable orifice) can be manually operated.
Note: Requires a logon access level of Service. Service Technicians must refer to the OptiView
Control Center - Service Instructions (Form 160.76-M1) for operation instructions and explanation
of all programmable setpoints and displayed values.
Table 27: Display only fields
Field/LED name
Condenser Refrigerant Level
Subcooler Effectiveness
Level Control State
Startup Delay Remaining
Level Control Valve Command
48
Description
Displays the present position of the liquid level. The refrigerant level is animated in the
cutaway view of the condenser.
Actual level
0% to 15%
16% to 31%
32% to 47%
48% to 63%
64% to 79%
> 79%
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 typically near 0.8 at design conditions.
Indicates one of the following states the level control routine is in: Manual, Inactive,
Startup Hold, Setpoint Ramp, PID Control, Hold.
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.
Indicates the valve command as a percentage of full open. It is only displayed when
the valve control method is analog
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
Displayed level
50%
60%
70%
80%
90%
100%