will be the longer of the two timers, start-to-start or
stop-to-start. The lag compressor in a system, are not
controlled by the anti-recycle timer.
The fan control ON pressure is the programmed setting
that is used to stage the condenser fans on, in relation to
discharge pressure (YLAA and YLAE units only).
The fan differential OFF pressure is the programmed
differential setting that is used to stage the condenser
fans off, in relation to discharge pressure (YLAA and
YLAE units only).
The total number of compressors setting determines the
stages of cooling available.
The total number of compressors must be
programmed correctly to ensure proper chiller
operation.
When the unit is connected to a remote ISN controller
this message allows the identification number to be
programmed into the unit.
The total number of fans per system must be
programmed correctly to ensure proper chiller
operation.
These messages are not applicable on YCWL/YCRL
units.
For loading to take place the leaving water temperature
must not be falling faster than the programmed value
when the temperature is within the 'RATE CONTROL
TEMP RANGE'.
This range starts at the top of the control range. Within
this range rate sensitivity as programmed above is
used. Above this range a fixed 1.7 °C/min is used.
Loading is prevented if the leaving water temperature is
falling faster than the 'RATE SENSITIVITY' value.
On units with a dual pump hydro kit the duty standby
time can be programmed. The DUTY PUMP is the pump
with the shortest run hours. Pump duty is changed when
the pumps are off or if the duty pump run hours are
greater than the ‘DUTY/STANDBY PUMP
CHANGEOVER DAYS’.
The four messages above apply to the YCWL unit only
when it is required to influence the position of a 3 way
condenser liquid value on initial start to avoid low
pressure trips. See section covering the operation of the
3 way valve output for further information.
1-29
Form 201.26.OI1(11/09)
F AN CONT ROL ON
PRESSURE= 1 5. 9BARG
FAN DI FFERENTI AL OFF
PRESSURE = 5. 5 2BARG
TOT AL NUMBER OF
COMPRESSORS = 6
REMOTE UNIT ID
PROGRAMMED = 0
SYS 1 NUMBER OF FANS
=3
SYS 2 NUMBER OF FANS
=3
RATE SENSITIVITY
=1.7°C/MIN
RAT E CONTROL TEMP
=1.6°C
DUTY / STANDBY PUMP
CHANGEOVER=XXDAYS
3-WAY VALVE RLH
TEMP SETP=XX C
3 -WAY VALVE PRESS
D I FF SETP=XXXBARG
3-WAY VALVE VOLTAGE
SETPO I NT=X . XVOLTS
3-WAY VALVE ON TIME
=XX SECONDS
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