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JOHNSON CONTROLS
80
FORM 150.62-NM8 (1020)
INSTALLATION
The operating sequence described below relates to
operation on a hot water start after power has been
applied, such as startup commissioning. When a
compressor starts, internal timers limit the minimum
time before another compressor can start to 1 minute.
1. For the chiller system to run, the
flow switch
must be
closed, any remote cycling contacts must be closed,
the daily schedule must not be scheduling the chiller
off, and temperature demand must be present.
2. When power is applied to the system, the
microprocessor will start a 2 minute timer. This is
the same timer that prevents an instantaneous start
after a power failure.
3. At the end of the 2 minute timer, the microprocessor
will check for cooling demand. If all conditions
allow for start, a compressor on the lead system will
start and the liquid line solenoid will open or the
EEV will begin to operate (EEV equipped chillers
only). Coincident with the start, the anti-coincident
timer will be set and begin counting downward from
“60” seconds to “0” seconds.
If the unit is programmed for auto lead/lag, the
system with the shortest average run-time of the
compressors will be assigned as the “lead” system.
A new lead/lag assignment is made whenever all
systems shut down.
4. Several seconds after the compressor starts, that
systems first condenser fan will be cycled ON
(outdoor air temperature more than 25°F (-4°C) or
discharge pressure).
See the section on Condenser
Fan Control located in Section 2 of this IOM
for details concerning condenser fan cycling
.
YCAL0090 through YCAL0134 cycle fans on
discharge pressure only.
5. After 1 minute of compressor run time, the next
compressor in sequence will start when a system has
to load. Additional compressors will be started at
60 second intervals as needed to satisfy temperature
setpoint.
6. If demand requires, the lag system will cycle
ON with the same timing sequences as the lead
system after the lead system has run for five minutes.
Refer to Capacity Control under Unit Operation in
Section 2 of this IOM for a detailed explanation of
system and compressor staging.
7. As the load decreases below setpoint, the compressors
will be shut down in sequence. This will occur at
intervals of either 60, 30, or 20 seconds based on
water temperature as compared to setpoint, and
control mode.
See Capacity Control under Unit
Operation in Section 2 of this IOM for a detailed
explanation.
8. When the last compressor in a “system” (two or
three compressors per system), is to be cycled
OFF, the system will initiate a pump-down. Each
“system” has a pump‑down feature upon shut‑off.
On a non-safety, non-unit switch shutdown, the
LLSV will be turned off or the EEV will close (EEV
equipped chillers only), and the last compressor
will be allowed to run until the suction pressure
falls below the Suction Pressure Cutout or for 180
seconds, whichever comes first.
UNIT OPERATING SEQUENCE
Содержание YCAL0014E Series
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