Section 2 - System Operating Procedures; Oil Heaters; Oil Heater Operation; Checking The Oil Level In The Oil Reservoir - York R-134a Operation And Maintenance Manual

FORM 160.76-O1
ISSUE DATE: 05/22/2019

SECTION 2 - SYSTEM OPERATING PROCEDURES

OIL HEATERS

If the oil heater is de-energized during a shutdown pe-
riod, it must be energized for 12 hours prior to starting
compressor, or remove all oil and recharge compressor
with new oil. (See Oil Charging Procedure on page
20.)

OIL HEATER OPERATION

The oil heater operation is controlled by the OptiV-
iew™ Control Center. The heater is turned on and off
to maintain the oil temperature differential to a value
50°F (27.8°C) above the condenser saturation tem-
perature. This target value is maintained by the control
panel.
If the target value is greater than 160°F (71°C), the tar-
get defaults to 160°F (71°C). If the target value is less
than 110°F (43.3°C), it defaults to 110°F (43.3°C).
To prevent overheating of the oil in the event of a con-
trol center component failure, the oil heater thermostat
(1HTR) is set to open at 180°F (82°C).
CHECKING THE OIL LEVEL IN THE
OIL RESERVOIR
Proper operating oil level – During operation, the oil
level should fall to the OPERATING RANGE identified
on the vertical oil level indicator label (See Figure 3).

FIGURE 3 - OIL LEVEL INDICATOR

JOHNSON CONTROLS
• If the oil level during operation is in the OVER
FULL region of the oil level indicator, oil should
be removed from the oil reservoir, This reduces
the oil level to the OPERATING RANGE.
• If the oil level during operation is in the LOW
OIL region of the oil level indicator, oil should
be added to the oil reservoir. (See Oil Charging
Procedure on page 20.)
Comply with EPA and local regulations
when removing or disposing of refrigera-
tion system oil!
START-UP PROCEDURE
Pre-Starting
Prior to starting the chiller, observe the Optiview™
Control Center – Operation Manual (160.76-O2).
Make sure the display reads SYSTEM READY TO
START.
Vent any air from the chiller waterboxes
prior to starting the water pumps. Failure
to do so will result in pass baffle damage.

START-UP

1. The Start/Stop control is operated via the Soft
START button on the Home Screen. When the
user presses the green START button, a dialog
box is displayed instructing the user to press the
ENTER button to start the chiller, or to press the
CANCEL button to abort the start.
2. When the chiller is running, the Start button is
replaced by a red SOFT STOP button. When the
user presses this button, a dialog box is displayed
instructing the user to press the ENTER button to
stop the chiller, or the CANCEL button to abort
the stop command. The Soft Stop command will
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drive the PRV closed and then shut off the chiller.
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