YORK INTERNATIONAL
87
FORM 150.62-NM7 (103)
The TOTAL NUMBER OF COM PRES SORS is the total
quantity of compressors in the chiller, and de ter mines
the stag es of cool ing avail able. Note in Ta ble 20, the
chill er may have sin gle or dual sys tems.
This MUST be programmed correctly
to as sure prop er chiller operation.
A single system chiller MUST have a
jumper be tween terminals 13 - 17 on
terminal block CTB1. If the jumper
is not in stalled, the unit will act as a
2-system chill er. The jumper is only
checked by the micro at unit pow er-up.
If the jump er is re moved, power must
be re moved and re-applied to reg is ter
the change in memory.
The number of fans per system is pro grammed for the
total number of fans on each system, or the total num ber
on the chiller di vid ed by 2. This is only pro gram ma ble on
YCAL0287 - YCAL0377 chill ers.
This MUST be programmed correctly
to as sure prop er chiller operation.
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
2
N U M B E R O F F A N S
P E R S Y S T E M = X
SYSTEM TRIP VOLTS
For individual system high current trip programming on
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 cal cu la tion
and programming will be necessary for the other system
in a 2-system chiller.
UNIT TRIP VOLTS
For total chiller high current trip programming on chill-
ers:
• Add the sum of all the the compressor and fan RLA’s
in the chiller
• 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 180A:
5V x 180A
x 1.25 =
1125VA
= 5.0V
225A 225A
The programmed value will be 5.0V.
When communications is required with a BAS or Op-
ti V iew Panel, individual unit IDs are necessary for com-
mu ni ca tions with specifi c chillers on a single RS-485
line. ID 0-7 is selectable.
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 sys tem or unit high current trip (See page
80) can be programmed. It also cal i brates the current
read out un der the OPER DATA key. The approximate
programmed value is calculated using the following
formulas:
R E M O T E U N I T I D
P R O G R A M M E D = X
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