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JOHNSON CONTROLS
103
FORM 150.62-NM8 (1020)
2
F A N D I F F E R E N T I A L O F F
P R E S S U R E = X X X P S I G
The
Fan Differential OFF Pressure
is the programmed
differential pressure value that is used to stage the
condenser fans off, in relation to discharge pressure.
Refer to Condenser Fan Control in Section 2 Unit
Operation and Tables 27 - 31.
The microprocessor will not allow pro
-
gramming the Fan Control ON Pressure
minus the “an Control Differential OFF
Pressure below 160 psig. This assures dis
-
charge pressure does not drop too low.
T O T A L N U M B E R O F
C O M P R E S S O R S = 6
The Total Number Of Compressors is the total quantity
of compressors in the chiller, and determines the stages
of cooling available. Note in Table 21, the chiller may
have single or dual systems.
This MUST be programmed correctly
to assure proper chiller operation.
A single system chiller MUST have a
jumper between terminals 13 and 17
on terminal block CTB1. If the jumper
is not installed, the unit will act as a
2-system chiller. The jumper is only
checked by the microprocessor at unit
power-up. If the jumper is removed,
power must be removed and re-applied
to register the change in memory.
N U M B E R O F F A N S
P E R S Y S T E M = X
The number of fans per system is programmed for the
total number of fans on each system, or the total number
on the chiller divided by 2. This is only programmable
on YCAL0090 through YCAL0134 chillers.
This MUST be programmed correctly
to assure proper chiller operation.
S Y S X T R I P V O L T S
= X . X V O L T S
U N I T T R I P V O L T S
= X . X V O L T S
Depending on the option, the trip voltage for a
specific system or unit high current trip
(see page
96)
can be programmed. It also calibrates the current
readout under the OPER DATA key. The approximate
programmed value is calculated using the following
formulas:
460VAC System Trip Volts
For individual system high current trip programming
on 460VAC chillers:
• Add the sum of the compressor and fan RLA’s in
the system
• Multiply the sum by 1.25
• Divide by 225A
• The resulting voltage is the value that should be
programmed
For example, if fan and compressor RLA’s total 100A:
5V x 100A x 1.25 = 625VA
= 2.8V
225A 225A
The programmed value will be 2.8V. A similar
calculation and programming will be necessary for the
other system in a 2-system chiller.
Summary of Contents for YCAL0014E Series
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