JOHNSON CONTROLS
162
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 8 – SERVICE
Low Pressure Cutout Alarm (09, 10, 11, 12)
Since tandem compressors are used there is a single
low pressure switch for system 1 and one for system 2.
If the low pressure switch opens both of the compres-
sors for that system will be turned off. If the low pres-
sure switch for system 1, (compressors 1A, 1B), opens
it will generate both a 09 and 10 alarm code. Likewise
if the low pressure switch opens for system 2, (com-
pressors 2A, 2B), opens it will generate both an 11 and
12 alarm code.
The low pressure switch opens at 50 PSIG and closes
at 71 PSIG. In order to generate a low pressure lockout
the high pressure switch must open three times within
a 2 hour window.
During the start up of the compressor system the low
pressure switch input is ignored for 30 seconds. After
the 30 second delay if the low pressure switch circuit
opens for 5 seconds the Unit Controller will turn off
both compressors for the system.
Power (24VAC) is supplied to the system 1 low pres-
sure switch circuit from wire 395 at terminal LPS1 of
the P15 connector. The binary input back to the Unit
Controller from the low pressure switch is wire 396 at
terminal LPS1 of the P15 connector. The above input is
then jumpered to terminal LPS2 of the P15 connector.
Power (24VAC) is supplied to the system 2 low pres-
sure switch circuit from wire 433 at terminal LPS3 of
the P16 connector. The binary input back to the Unit
Controller from the low pressure switch is wire 434 at
terminal LPS3 of the P16 connector. The above input is
then jumpered to terminal LPS4 of the P16 connector.
Limit Switch Alarms (13, 14, 15)
The control monitors the limit switch status for each of
the heating sections installed. If the limit switch circuit
opens the control de-energizes the heat section output
for the section with the open limit circuit and energizes
the indoor blower output. The supply fan performs a
Fan Delay Off when the limit re-closes.
In order to generate a limit lockout the limit switch
must open three times within a 2-hour window.
The limit input for heat section 1 is located at terminal
LIM1 wire 507 of the P10 connector. The limit input
for heat section 2 is located at terminal LIM2 wire 522
of the P10 connector. The limit input for heat section
3 is located at terminal LIM3 wire 533 of the P10 con-
nector.
Gas Heating Alarms (16, 17, 18)
The Unit Controller monitors the output to the gas
valve. If the Unit Controller is calling for the operation
of the heat stage and voltage is not present after 5 con-
tinuous minutes it will generate an alarm.
If the Unit Controller is not calling for the operation of
the heat stage and voltage is present at the gas valve for
5 continuous minutes it will generate an alarm and lock
on the supply fan. If the input goes away the control
will revert to normal operation.
The gas valve input for heat section 1 is located at ter-
minal GV1 wire 510 of the P10 connector. The gas
valve input for heat section 2 is located at terminal
GV2 wire 525 of the P10 connector. The gas valve in-
put for heat section 3 is located at terminal GV3 wire
536 of the P10 connector.
Space Temperature Sensor Alarm (19)
This alarm indicates the space temperature input is
either open or shorted. The display will show a value
of –40.0° F. The space temperature input is at ST and
GND of the P6 connector. To troubleshoot compare the
resistance of the input to the temperature in the space
using
.
Supply Air Temperature Sensor Alarm (20)
This alarm indicates the supply air temperature input is
either open or shorted. The display will show a value of
–40.0° F. The supply air temperature input is at SAT+
and SAT- of the P11 connector. To troubleshoot com-
pare the resistance of the input to the actual supply air
temperature using
.
Return Air Temperature Sensor Alarm (21)
This alarm indicates the return air temperature input is
either open or shorted. The display will show a value of
–40.0° F. The return air temperature input is at RAT+
and RAT- of the P11 connector. To troubleshoot com-
pare the resistance of the input to the actual return air
temperature using
.
Outdoor Air Temperature Sensor Alarm (22)
This alarm indicates the outdoor air temperature in-
put is either open or shorted. The display will show a
value of –40.0° F. The outdoor air temperature input is
at OAT+ and OAT- of the P11 connector. To trouble-
shoot compare the resistance of the input to the actual
outdoor air temperature using
.
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