York YCUL0020, Installation, Operation And Maintenance Manual

Page: 119 / 178

JOHNSON CONTROLS
119
SECTION 7 – UNIT CONTROLS
Form 150.63-NM9
Issue date: 5/20/2021
7
A C T I V E R E M O T E C T R L
N
O N E
There are several types of remote systems that can be
used to control or monitor the unit. The following mes-
sages indicate the type of remote control mode active:
NONE – no remote control active. Remote moni-
toring may be via ISN.
ISN – YORK Talk via ISN allows remote load
limiting and temperature reset through an ISN
system.
*LOAD LIM – load limiting enabled. Can be ei-
ther stage 1 or stage 2 of limiting.
*PWM TEMP – EMS-PWM temperature reset
*Refer to the section on OPERATING CON-
TROLS.
If the microboard is programmed for CURRENT
FEEDBACK ONE BeforeUNIT under the OPTIONS
key, the display will show up as the first display before
the SYS 1 displays. Total unit current is displayed as
shown below:
U N I T A M P S = 5 4 . 0
V O L T S = 1 . 2
If the microboard is programmed for CURRENT
FEEDBACK NONE, no current display will appear.
S Y S X C O M P S T A T U S
1 = X X X 2 = X X X 3 = X X X
S Y S X R U N T I M E
X X - X X - X X - X X D - H - M - S
S Y S X L L S V I S O N
H O T G A S S O L I S O F F
S Y S X F A N S T A G E 3
S Y S X A M P S = 3 6 . 0
V O L T S = 0 . 8
The preceding five messages will appear sequentially,
first for system 1, then for system 2.
The first message indicates the system and the associ-
ated compressors which are running.
The second message indicates the system run time in
days – hours – minutes – seconds. Note that this is not
accumulated run time but pertains only to the current
system cycle.
The third message indicates the system, and whether
the liquid line solenoid or EEV pilot solenoid and hot
gas solenoid are being turned ON by the microboard.
Note that hot gas is not available for system 2, so there
is no message pertaining to the hot gas solenoid when
system 2 message is displayed.
The fourth message indicates which stage of condenser
fan operation is active.
See the section on Condenser Fan Control in
SECTION
8 – UNIT OPERATION for more information.
The fifth message displays current as sensed by the op-
tional current feedback circuitry. The display reads out
in amps along with the DC feedback voltage from the
module. Current is calculated by:
225 A x Actual Volts
5 Volts
Individual displays will be present for each system,
if CURRENT FEEDBACK ONE BeforeSYSTEM
is programmed under the OPTIONS key. Combined
compressor current for each system is displayed.