Section 2 - System Operating Procedures; Oil Heaters; Oil Heater Operation; Checking The Oil Level In The Oil Reservoir - York YK Series Operation And Maintenance

FORM 160.76-O1
ISSUE DATE: 6/15/2015

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 compres-
sor with new oil. (Refer to Oil Charging Procedure on
Page 22.)

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 (Refer to Figure 3
on Page 9).

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. (Refer to Oil Charging
Procedure on Page 22.)
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 and Maintenance (Form
160.54-O1). 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. If the chilled water pump is manually operated,
start the pump. The Control Center will not al-
low the chiller to start unless chilled liquid flow is
established through the unit. If the chilled liquid
pump is wired to the Microcomputer Control Cen-
ter the pump will automatically start, therefore,
this step is not necessary.
2. To start the chiller, press the COMPRESSOR
START switch. This switch will automatically
spring return to the RUN position. (If the unit
was previously started, press the STOP/RESET
side of the COMPRESSOR switch and then press
the START side of the switch to start the chill-
er.) When the start switch is energized, the Con-
LD08647
trol Center is placed in an operating mode and
any malfunction will be noted by messages on a
graphic display.
2
9