JOHNSON CONTROLS
137
SECTION 7 – UNIT CONTROL CENTER
FORM 150.67-NM2
ISSUE DATE: 01/31/2019
7
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. Please 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.
Please 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 the stage of condenser
fan operation that is active.
See the section on Condenser Fan Control in the Unit
Operation section 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:
225A • Actual Volts
5 Volts
Individual displays will be present for each system, if
CURRENT FEEDBACK ONE PER SYSTEM is pro-
grammed under the OPTIONS Key. Combined com-
pressor current for each system is displayed.
E V A P O R A T O R W A T E R
P U M P S T A T U S = X X X X
The evaporator pump dry contacts are energized when
any compressor is running, or the unit is not OFF on
the daily schedule and the unit switch is on, or the unit
has shutdown on a Low Leaving Chilled Liquid fault.
However, even if one of above is true, the pump will
not run if the micro panel has been powered up for less
than 30 seconds or if the pump has run in the last 30
seconds to prevent pump motor overheating.
E V A P P U M P T O T A L R U N
H O U R S = X X X X X
The Evaporator Pump Total Run Hours display indi-
cates the total pump run hours. Total hours continu-
ally increments similar to Compressor Run Hours. If
dual pumps are fitted, run hours indicates total hours
on both pumps.
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 monitoring
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 using contact clo-
sure.
PWM TEMP – EMS temperature reset
* Refer to the section on Operating
Controls.
If the micro is programmed for CURRENT FEED-
BACK ONE PER UNIT under the OPTIONS Key, the
display will show up as the first display prior to the
SYS 1 displays. Total chiller 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 micro is programmed for CURRENT FEEDBACK
NONE, no current display will appear.
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