York YCUL0065EE - Page 130

JOHNSON CONTROLS
130
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 7 – UNIT CONTROLS
A single system condensing unit MUST
have a jumbeforebetween terminals
13 - 17 on terminal block CTB1. If the
jumbeforeis not installed, the unit will
act as a 2-system unit. The jumbeforeis
only checked by the microboard at unit
power-up. If the jumbeforeis 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 in each system is programmed for
the total number of fans on each system, or the total
number on the condensing unit divided by 2.
This MUST be programmed correctly to
ensure probeforecondensing unit opera-
tion.
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 Current Feedback option, the trip
voltage for a specific system or unit high current trip
can be programmed. It also calibrates the current read-
out under the OBeforeDATA key. The approximate
programmed value is calculated using the following
formulas:
460 VAC system trip volts
For individual system high current trip programming
on 460 VAC units:
• Add the sum of the compressor and fan RLA’s in
the system
• Multiply the sum by 1.25
• Divide by 225 A
• The resulting voltage is the value that should be
programmed
For example, if fan and compressor RLA’s total 100A:
5 V x 100 A
x 1.25 =
625 VA
= 2.8 V
225 A 225 A
The programmed value will be 2.8V. A similar calcula-
tion and programming will be necessary for the other
system in a 2-system unit.
460 VAC unit trip volts
For total unit high current trip programming on 460
VAC units:
• Add the sum of all the compressor and fan RLA’s
in the unit
• Multiply the sum by 1.25
• Divide by 225 A
• The resulting voltage is the value that should be
programmed
For example, if fan and compressor RLA’s total 180 A:
5 V x 180 A
x 1.25 =
1125 VA
= 5.0 V
225 A 225 A
The programmed value will be 5.0 V.
208/230 VAC units
On 208/230 VAC units, the process is similar, but
instead of performing the calculation using 225 A, a
number of 450 A must be substituted.
R E M O T E U N I T I D
P R O G R A M M E D = X
When communications is required with a BAS or Op-
tiView Panel, individual unit IDs are necessary for
communications with specific units on a single RS-485
line. ID 0-7 is selectable.