Refrigerant Level Control Screen; Figure 8 - Refrigerant Level Control Screen - York YD Series Operation Manual

SECTION 2 – OPTIVIEW CONTROL CENTER
(Software version C.MLM.11.02.xxx (and later) or C.OPT.11.02.300 (and later))
Overview
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
orifice) can be manually operated.
A Variable Orifice is used to control the condenser re-
frigerant level to the Refrigerant Level Setpoint. The
control thresholds are applied in two different zones,
as determined by the error relationship between the ac-
tual refrigerant level and the Level Setpoint. Zone 1
parameters are used when the error is less than or equal
to 9%. Zone 2 parameters are used when the error is
greater than 9%. When transitioning from Zone 2 to
Zone 1, the error must be less than or equal to 9% for
60 seconds before the Zone 1 parameters are used. If
the error is greater than 9%, the Zone 2 parameters are
immediately implemented.
Requires a login access level of SER-
VICE. Service technicians refer to YORK
Service manual 160.69-M1 for opera-
tion instructions and explanation of all
programmable setpoints and displayed
values.

FIGURE 8 - REFRIGERANT LEVEL CONTROL SCREEN

40

REFRIGERANT LEVEL CONTROL SCREEN

Display Only
Refrigerant Level Position
Displays the present position of the liquid level. The
refrigerant level is also animated in the cutaway view
of the condenser.
Refrigerant Level Control Mode
Indicates whether the liquid level control is under
manual or automatic control.
Raise (LED)
Is ON when the digital output controlling the Level
Raise is on.
Lower (LED)
Is ON when the digital output controlling the Level
Lower is on.
Zone Control State
Displays the Zone Control State (Zone 1, Zone 2, Zone
2 to Zone 1) currently in effect for the Refrigerant
Level Control. "Zone Control Off" is displayed when
chiller is shutdown.
FORM 160.69-O1
ISSUE DATE: 9/30/2012
550057
JOHNSON CONTROLS