JOHNSON CONTROLS
116
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 5 – SEQUENCE OF OPERATION
Internal Compressor Line Break
(Compressor System A (25–60 Ton))
If the compressor goes offline because of the internal
line break, it indicates a Fault Code 3 on the Digital
Compressor Controller and results in the opening of
the compressor safety circuit. This situation should be
picked up by the Compressor Motor Protection Mod-
ule, but the problem could still exist and determined by
doing an Ohm reading on the motor.
Internal Compressor Line Break
(Compressor System B–F)
If the compressor goes offline because of the inter-
nal line break, it does not result in the opening of the
compressor safety circuit and does not show up in the
compressor status screen. The Unit Controller contin-
ues to send a 24VAC binary signal to the compressor
contactor. When the internal Compressor Line Break
resets, the compressor comes back online provided
there is still a call for its operation. This situation
should be picked up by the Compressor Motor Protec-
tion Module, but the problem could still exist and can
be determined by doing an Ohm reading on the motor.
Digital Compressor Controller
Refer to
in this manual for a de-
tailed explanation on the operation of the Digital Com-
pressor Controller. If the Digital Compressor Controller
interrupts the operation of the compressor, the compres-
sor safety circuit opens.
Circuit Breaker (Compressor System A
(25–60 Ton))
If the compressor “A” goes offline because of the cir-
cuit breaker, it indicates a Fault Code 3 on the Digital
Compressor Controller and results in the opening of
the compressor safety circuit. The circuit breaker must
be manually reset, as well as resetting the Compressor
lockout through the Unit Controller before the com-
pressor is able to operate.
Circuit Breaker (Compressor Systems
B–F)
If the compressor goes offline because of the circuit
breaker, the compressor safety circuit does not open
and it does not show up in the compressor status screen.
The Unit Controller continues to send a 24VAC binary
signal to the compressor contactor. The circuit breaker
is manually reset to operate the compressor.
The safety circuit supplies a binary 24VAC input to the
Unit Controller. The input for Compressor System A is
connector J21, pin 2; the input for Compressor System
B is connector J21, pin 5; the input for Compressor
System C is connector J22, pin 2G; the input for Com-
pressor System D is connector J22, pin 5; the input for
Compressor System E is connector J23, pin 2; and the
input for Compressor System F is connector J23, pin 5.
TABLE 23 -
COMPRESSOR SAFETIES
UNIT
COMP HIGH PRESSURE
CUT OUT
EXTERNAL
COMPRESSOR
MOTOR PROTECTOR
INTERNAL
COMPRESSOR
LINE BREAK
DIGITAL
COMPRESSOR
CONTROLLER
CIRCUIT
BREAKER
025
A
Yes
No
Yes
Yes
Yes
025
B
Yes
No
Yes
No
Yes
032
A
Yes
Yes
No
Yes
Yes
032
B
Yes
No
Yes
No
Yes
035
A
Yes
Yes
No
Yes
Yes
035
B
Yes
Yes
No
No
Yes
040
A
Yes
Yes
No
Yes
Yes
040
B
Yes
Yes
No
No
Yes
050
A
Yes
Yes
No
Yes
Yes
050
B
Yes
No
Yes
No
Yes
050
C
Yes
No
Yes
No
Yes
060
A
Yes
Yes
No
Yes
Yes
060
B
Yes
Yes
No
No
Yes
060
C
Yes
Yes
No
No
Yes
