Refrigerant Level Control Screen - York YK-EP Operation And Maintenance Manual

Refrigerant level control screen

Figure 12: Refrigerant level control screen
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 login access level of SERVICE.
Table 22: Display only fields
Field/LED name
Condenser Refrigerant Level Displays the present position of the liquid level*.
Subcooler Effectiveness
Level Control State
Startup Delay Remaining
Level Control Valve
Command
YK-EP Style B Centrifugal Chiller
Description
The Subcooler Effectiveness is evaluated with the following
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 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.
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