YORK INTERNATIONAL
8
FORM 160.54-O2(1102)
FORM 160.54-O2(1102)
9
YORK INTERNATIONAL
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”, page
22.)
OIL HEATER OPERATION
The oil heater operation is controlled by the
OptiView™ Control Center. The heater is turned on
and off to maintain the oil temperature to a value
50°F (10°C) above the condenser saturation tempera-
ture. This is the target value and if the oil temperature
falls to 4°F (-15.5°C) or more below the target, the
heater is turned on. It is turned off when the oil
temperature increases to 3°F (-16°C) above the target
value.
If the target value is greater than 160°F (71°C), the
target 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
control center component failure, the oil heater ther-
mostat (1HTR) is set to open at 180°F (82°C).
CHECKING THE OIL LEVEL
IN THE OIL RESERVOIR
Proper operating oil level – the upper and lower
sight glasses.
If the oil is excessively high after start-up, the
excess oil may be drained from the oil filter drain
valve while the compressor is running.
If oil level is low, oil should be added to the com-
pressor. (See “Oil Charging Procedure”, page 22)
Comply with EPA and Local regu-
lations when removing or dispos-
ing of Refrigeration System oil!
START-UP PROCEDURE
Pre-Starting
Prior to starting the chiller, observe the OptiView
Control Center. Make sure the display reads
SYS-
TEM READY TO START
.
To pre-start the chiller, use the following procedure:
1.
Oil Heater
– The oil heater must be energized
for 12 hours prior to starting the chiller.
2. Prior to start, the clock must be programmed for
the proper day and time. Any setpoints which are
desired to be changed may be programmed. All
Control Center setpoints should be programmed
before the chiller is started. (Refer to Form
160.54-O1).
Vent ant air from the chiller water
boxes 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 allow
the chiller to start unless chilled liquid flow is es-
tablished through the unit. (A field supplied chilled
water flow switch is required.) If the chilled liquid
pump is wired to the Microcomputer Control Cen-
ter the pump will automatically start, therefore,
this step is not necessary.
System Operating Procedures
