Oil Return Min; Standby Lubrication; High Condenser Pressure Warning Threshold - Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual

FORM 160.54-M1
The speed can be set to a specific frequency, as pro-
grammed by the SET key as follows:
1. Press SET key.
2. Use the numeric keys to enter the desired value.
3. Press ENTER () key.
4. If the AUTO key is pressed, automatic speed con-
trol is invoked.

OIL RETURN MIN

(Software version C.OPT.01.21.307 and later; P,Q,H9
compressors only)
To avoid an OIL – LOW TEMPERATURE DIFFER-
ENTIAL cycling condition from preventing a chiller
start after running at low load conditions for extend-
ed periods, the Oil Return Solenoid (1SOL) is cycled
closed when the oil temperature gets too low on the P,
Q and H9 compressor chillers, while the chiller is run-
ning. The OIL RETURN MIN SETPOINT key appears
on the OIL SUMP Screen when the Chiller Style/Com-
pressor 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 80.0°F
to 110.0°F (default 95.0°F) and controls the oil return
Solenoid as follows:
• When the compressor is running and the Oil Sump
Temperature is less than Oil Return Min setpoint,
close (de-energize) the Oil Return Solenoid by de-
energizing K12 relay.
• When the compressor is running and Oil Sump
Temperature is greater than Oil Return Min + 7°F,
open (energize) the Oil Return Solenoid by ener-
gizing 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 re-
mains open until System Coastdown.

STANDBY LUBRICATION

To maintain oil seal integrity while the chiller is shut-
down, a feature can be enabled that turns on the Oil
Pump for 2 minutes every 24 hours if the chiller has
JOHNSON CONTROLS
SECTION 32 - SYSTEM CALIBRATION, SERVICE SETPOINTS AND RESET PROCEDURES
not been run in the past 24 hours. While the Oil Pump
is running, STANDBY LUBE IN PROCESS, along
with a countdown timer displaying the time remain-
ing in the lube cycle is displayed. If the chiller is style
D equipped with an Oil Pump Variable Speed Drive,
the operating oil pressure will be the programmed Oil
Pressure setpoint.
If at least 15 PSID of oil pressure is not achieved within
30 seconds of turning on the Oil Pump, the cycle is ter-
minated and WARNING - STANDBY LUBE - LOW
OIL PRESSURE is displayed and no more standby lu-
brications will occur until a.) the FAULT ACKNOWL-
EDGE keypad key is pressed after login at SERVICE
access level, at which point another lube cycle will be
attempted or b.) the chiller is started.
Standby lubrication cycles will not be performed if ei-
ther Oil Pressure transducer is reading a pressure out
of its range (HOP less than or equal to 6.8 PSIG; LOP
is less than or equal to 0 PSIG). This assures that the
oil pump will not be turned on with the shells at atmo-
spheric pressure, as they would be during maintenance.
When logged in at SERVICE access level, the time
remaining until the next Standby lubrication cycle is
displayed as NEXT OIL SEAL LUBRICATION = xx
Hrs on the OIL SUMP Screen.
To ENABLE or DISABLE the Standby lubrication
cycles, proceed as follows:
1. At the keypad, log in at SERVICE access level
2. Select OIL SUMP Screen.
3. Use ◄ and ► keys to select Enable or Disable.
4. Press ENTER () key.
HIGH CONDENSER PRESSURE WARNING
THRESHOLD
The Condenser Pressure at which a High Pressure
warning message is displayed and the Pre-rotation
Vanes are inhibited from further opening, is program-
mable over the range of 44.9 to 162.5 PSIG (R-134a),
or 84.0 to 246.3 PSIG (R22). The Default value for
R-134a is 162.5 PSIG. The Default for R22 is 246.3
PSIG. The threshold is automatically set to 193 PSIG
when the Heat Pump Duty is set to enabled. The warn-
ing message will clear and the PRV inhibit is removed
when the pressure decreases to 5 PSIG below the pro-
grammed value. Proceed as follows to enter this value:
using access code 1 3 8 0.
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