JOHNSON CONTROLS
116
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
SECTION 7 – UNIT CONTROLS
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 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 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 A M P S = 3 6 . 0
V O L T S = 0 . 8
S Y S X F A N S T A G E 3
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 the stage of condenser
fan operation that is active.
See Standard Condenser Fan Control on page 160 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 V
5 V
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 s or if the pump has run in the last 30 s 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.
LOAD LIM – Load limiting enabled using contact clo-
sure.
PWM TEMP – EMS temperature reset
*See Remote BAS/EMS Temperature Reset Using
a Voltage or Current Signal on page 165.
If the microprocessor is programmed for CURRENT
FEEDBACK ONE PER UNIT under the OPTIONS
key, the display will show up as the first display before
the SYS 1 displays. Total chiller current is displayed
as follows:
U N I T A M P S = 5 4 . 0
V O L T S = 1 . 2
If the microprocessor is programmed for CURRENT
FEEDBACK NONE, no current display will appear.
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