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FORM 160.87-OM1
ISSUE DATE: 8/24/2018
ECONOMIZER CAPACITY CONTROL SETPOINTS SCREEN
FIGURE 29 - ECONOMIZER CAPACITY CONTROL SETPOINTS SCREEN
OVERVIEW
This screen displays a view of the economizer capacity
control setpoints and buttons.
Service Level Access is required to navigate to this
screen.
ADJUSTABLE with Service Access Level
High Head for Refrigerant Flow
(Range 5 to 150 PSID, Default 64 PSID)
This displays the high head setpoints at which the
economizer will activate. These points can be changed
according to when the operator wishes the economizer
to start operating.
Refrigerant Flow Criteria at High Head
(Range 100 to 50000 CFM, Default 6000 CFM)
Displays the refrigerant flow in CFM that is where the
economizer will activate in the high head condition.
Low Head for Refrigerant Flow
(Range 5 to 150 PSID, Default 30 PSID)
This displays the low head setpoints at which the econ-
omizer will activate. These points can be changed ac-
cording to when the operator wishes the economizer to
stop operating.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Refrigerant Flow Criteria at Low Head
(Range 100 to 50000 CFM, Default 8200 CFM)
Displays the refrigerant flow in CFM that is where the
economizer will activate in the low head condition.
Econ Stop Refrig Flow Offset
(Range 100 to 5000 CFM, Default 2000 CFM)
Displays the difference between the refrigerant flow to
start the economizer and the refrigerant flow to stop the
economizer. This offset prevents the economizer from
starting and stopping too rapidly.
Econ Temperature Setpoint Offset
(Range -6.0 to -2.5°F, Default -2.5°F)
Displays the economizer temperature setpoint offset.
Econ Startup Delay
(Range 0 to 30 minutes, Default 5 minutes)
Displays the amount of time set to delay the start of the
economizer.
Econ Start Econ Level Offset
(Range 0 to 100%, Default 40%)
Shows the position of the Pre-Rotation Vanes at full
capacity. XXXXXX
LD20149
73
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