York YD A, Эксплуатация и техническое обслуживание, Страница: 23 / 52

JOHNSON CONTROLS
23
FORM 160.69-O2
ISSUE DATE: 9/30/2020
2
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
36 .)
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 tempera-
ture. This is the target value and if the oil temperature
falls to 4°F (2.2°C) or more below the target, the heater
is turned on. It is turned off when the oil temperature
increases to 3°F (1.7°C) above the target value.
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
on page 23 .
• 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 36 )
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. Make sure the display reads SYSTEM
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
160.69-O1 ).
Vent any air from the chiller water boxes
prior to starting the water pumps. Failure
to do so will result in pass baffle damage.
FIGURE 3 - OIL LEVEL INDICATOR
LD08647