FORM 160.54-O1
63
JOHNSON CONTROLS
Target / Setpoint Oil Pressure (Variable Speed Oil
Pump Only)
The Variable Speed Oil Pump (VSOP), if installed,
operates to control to a defined Oil Pressure value. Dur
-
ing prelube, and for the first 15 seconds after prelube,
this setpoint value is 45.0 PSID. During this time, this
field will display the target value. After 15 seconds,
this value will display the user-programmed setpoint
Oil Pressure.
Pulldown Time Remaining
(Variable Speed Oil Pump Only)
Displays the time remaining until the user-programmed
Oil Pressure setpoint is used.
Variable Speed Oil Pump Control Mode
(Variable Speed Oil Pump Only)
Indicates whether the variable speed oil pump speed is
under manual or automatic control.
Oil Pump Drive Command Frequency
(Variable Speed Oil Pump Only)
Displays the actual Speed Command being sent to the
VSOP. This value could be the result of automatic con-
trol based on the Oil Pressure setpoint, or the result of
a manual speed command.
Manual Oil Pump Operation Time Left
Displays the time remaining in the 10-minute manual
oil pump operation described below.
prograMMaBLe
Standby Lube (Enabled / Disabled)
Access Level Required:
SERVICE
Allows the user to enable or disable the standby lube
operation. When enabled, this function causes the Oil
Pump to operate for a period of two (2) minutes at 24-
hour intervals from when the oil pump was last run for
at least 2 minutes. Service Technicians refer to YORK
Service Manual 160.54-M1.
OIL RETURn MIn
(Software version C.OPT.01.21.307 and later; P,Q,H9
compressors only)
Access Level Required:
SERVICE
To avoid an “Oil – Low Temperature Differential”
cycling condition from preventing a chiller start after
running at low load conditions for extended periods, the
Oil Return Solenoid (1SOL) is cycled closed when the
oil temperature gets too low on the P, Q and H9 com-
pressor chillers, while the chiller is running. The OIL
RETURN MIN Setpoint key appears on the Oil Sump
Screen when the CHILLER STYLE/COMPRESSOR
TYPE Setpoint (on the Operations Screen) is set to P, Q
or H9 compressor in Service access level. This setpoint
is programmable over the range of 80.0ºF to 110.0ºF
(default 95.0ºF) and controls the oil return Solenoid as
follows:
• When the compressor is running and the Oil Sump
Temperature < Oil Return Min Setpoint, close (de-
energize) the Oil Return Solenoid by de-energizing
K12 relay
• When the compressor is running and Oil Sump Tem
-
perature > Oil Return Min + 7°F, open (energize)
the Oil Return Solenoid by energizing K12 relay.
• During coastdown, the solenoid operation is not
changed from standard logic, it remains closed.
During startup the operation is not changed from
standard logic, it remains closed for 1 minute after
System Run.
In previous software versions, the Oil Return Solenoid
(1SOL) is opened 1 minute into System Run
and remains open until System Coastdown
Pressure Setpoint (Variable Speed Oil Pump Only)
Access Level Required:
SERVICE
The Variable Speed Oil Pump (VSOP) operates to control
to a defined Oil Pressure value. This key allows the user to
define the setpoint for the VSOP control. Service Techni
-
cians refer to YORK Service Manual 160.54-M1.
Control Period (Variable Speed Oil Pump Only)
Access Level Required:
SERVICE
By default, the automatic VSOP control algorithm oper-
ates every 300ms. This key allows the user to specify the
control period in multiples of 300ms. Service Techni-
cians refer to YORK Service Manual 160.54-M1.
2
Summary of Contents for YORK YK MaxE
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