JOHNSON CONTROLS
17
SECTION 1 - SYSTEM FUNDAMENTALS
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
1
Head Pressure Control
The Head Pressure Control feature enables chiller
control of a field-mounted facility condenser water
temperature control means, if one is necessary for pro-
longed cold water startup as described in SECTION
3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS
AND NAVIGATION of this manual. YMC
2
chillers
are capable of operation within a wide range of con-
denser water temperatures. However, a low minimum
condenser water temperature, as specified in the YMC
2
Engineering Guide (Form 160.84-EG1), is required
to maintain sufficient pressure differential (head) be-
tween the condenser and evaporator for proper refrig-
erant management in the chiller. The head pressure
control function provides an analog output control sig-
nal from the OptiView™ Control Center that responds
to the programmed Head Pressure (condenser pressure
minus evaporator pressure) Setpoint. The 0-10VDC or
4-20mA output is configurable from the Head Pressure
Control screen when the feature is Enabled. Output
wiring is described in the Field Connections section of
the Wiring Diagram (Form 160.84-PW2 and PW4):
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