JOHNSON CONTROLS
164
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 8 – SERVICE
Space Temperature Offset Alarm (33)
This alarm is generated when the resistance in the
Space Temperature Offset circuit is greater than 20,000
ohms. The Space Temperature Offset input is at ter-
minals SSD and GND of the P6 connector. Check the
resistance between these two points. If greater than
20,000 ohms check the tightness of the connections
and the wire wiring between the Unit Controller and
the space sensor. If both are okay and the resistance is
still greater than 20,000 ohms replace the space sensor
reset.
CV/VAV Input Alarm (34)
This alarm indicates the resistance between terminals
CV/VAV and CV/VAV at the P7 connection is out of
range. The acceptable range is 0.0 to 20,000 ohms.
Check the resistance between the two CV/VAV termi-
nals and take appropriate action.
Low Voltage Alarm (35)
The Unit Controller monitors the 24VAC input to the
control. The input has two thresholds. The voltage
must be above 19.2VAC or the control will not turn
on a contactor. If the voltage is not above this value it
will not turn on the contactor and flashes the fault code.
If contactors are energized and the voltage drops be-
low 16.0VAC the Unit Controller will de-energize the
contactors and flash the alarm. To troubleshoot check
the voltage between the “R” and “COM” at the ¼ inch
terminals on the board.
Smoke Purge Mode Alarm (36)
This is not an alarm but rather an indication the unit has
been placed in a smoke purge mode. Verify the pres-
ence of 24VAC between PURGE connection at the P3
connector and “C” on the P1 connector. If 24VAC is
present and the unit is not supposed to be in the Purge
mode trace the field wiring to determine why the volt-
age is present.
High Duct Static Pressure Alarm (37)
This alarm indicates the duct static pressure has ex-
ceeded the Duct Static Shutdown Setpoint. The prob-
lem could be caused by a faulty Duct Static Pressure
Transducer input. To check measure the VDC input
between terminal DP+ wire 337 at the P21 connector
and terminal DP- wire 338 at the P21 connector. Com-
pare the voltage verses the duct pressure the control
indicates to
the manual. Also verify that 24VAC is present between
terminals “COM” and “EXC” at the duct static trans-
ducer.
Supply Air Temperature Cooling Alarm (38)
The Unit Controller compares the supply air tempera-
ture to the “
SUPPLY AIR TEMP ALARM FOR COOL-
ING
” and initiates the alarm based on the following
criteria:
•
All the stages of cooling have been ON for 10 or
more minutes.
•
The supply air temperature is 20 or more degrees
above the “
SUPPLY AIR TEMP ALARM FOR
COOLING
” setpoint for 10 minutes.
•
The outdoor air is not 20.0° F or more warmer
then the “
SUPPLY AIR TEMP ALARM FOR
COOLING
” setpoint.
•
The outdoor air damper is not open more than
20%.
Supply Air Temperature Heating Alarm (39)
The Unit Controller compares the supply air tempera-
ture to the “
SUPPLY AIR TEMP ALARM FOR HEAT-
ING
” and initiates the alarm based on the following
criteria:
•
All the stages of heating have been ON for 10 or
more minutes.
•
The supply air temperature is 20 or more degrees
below the “
SUPPLY AIR TEMP ALARM FOR
HEATING
” setpoint for 10 minutes.
•
The outdoor air is not 20.0° F or more cooler then
the “SUPPLY AIR TEMP ALARM FOR HEAT-
ING” setpoint.
•
The outdoor air damper is not open more than
20%.
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