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Carrier OMNIZONE 50XJ064-104 User Manual

Page 28

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28

Table 20 — Alarms Displayed at Unit LID

NOTES:
1. Unit display will indicate alarm by displaying “There is 1 Alarm” or

“There are X alarms”, for the active alarms in the controller.

2. Red light on, indicating alarm.
3. Yellow light is on, indicating a warning.

Standard Diagnostic Features, Alarm and
Warning Lights

SUPPLY AIR TEMPERATURE SENSOR FAILURE — If
the supply air temperature sensor fails and indicates either
245 F from a short or -40.0 F from and open sensor the control-
ler outputs will be forced to off with safety forces, the alarm
output will close and the red Alarm light will be lit. A system
alarm will be generated and displayed on the unit keypad. Unit
reset is automatic when the supply air sensor has a valid
reading again.
DUCT STATIC PRESSURE SENSOR FAILURE — If the
duct static pressure sensor fails and indicates either 5.0 inches
from a short or 0.0 inches from and open sensor the controller
outputs will be forced to off with safety forces, the alarm
output will close and the red Alarm light will be lit. A system
alarm will be generated and displayed on the unit keypad. Unit
reset is automatic when the supply air sensor has a valid
reading again.
FIRE/SHUTDOWN INPUT (FSD) — This is a normally
closed input, which when opened, deenergizes an isolation
relay in the unit, opening the input to the controller. When this
input turns opens, all control outputs are immediately turned
off, including the fan. Fire forces will be displayed on the
outputs. Unit reset is automatic when the FSD input is closed

again. A system alarm will be generated and displayed at the
keypad.
DUCT HIGH STATIC INPUT (DHS) — This

air

switch

provides over pressurization protection for the ductwork. It is
factory installed in the unit. The switch is a normally open
switch, with adjustable manual setting (range is 1 to 5 in. wg
default setting is 3.0 in. wg). Upon switch closure, the control-
ler outputs will be forced to off with safety forces, the alarm
output will close and the red Alarm light will be lit. A system
alarm will be generated and displayed on the unit keypad. Unit
reset is automatic when the duct pressure is again below the
switch setting minus the device hysteresis.
COMPRESSOR MULTIPLEX (MUX) BOARD — A re-
sistance board is used to generate a variable voltage input to the
controller to determine compressor status. If the voltage output
from this board gets out of the acceptable range the controller
outputs will be forced to off with safety forces, the alarm
output will close and the red Alarm light will be lit. A system
alarm will be generated and displayed on the unit keypad. Unit
reset is automatic when the Mux board has a valid reading
again. The valid range is between 1.5 and 10 vdc. The table
below indicates what voltages correspond to the compressor
status indicated in the controller.

FUNCTION ALARM MESSAGE (Actual Text)

CAUSE

UNIT RESPONSE (See Notes)

RESET

SAT

SAT xx.x dF outside
limit of xxx.x dF

SAT reads out of prescribed range
for 5 sec. during operation

Unit shuts down and
indicates alarm

Automatic

DSP_ALM

Duct Static Sensor Failure

Duct Pressure Sensor reading is out of
range (i.e., likely faulty sensor or circuit).

Unit shuts down, indicates alarm

Automatic

FSD

Fire Shutdown

External Fire Alarm input opens for 5 sec.

Unit shuts down, indicates alarm

Automatic

DHS

Duct High Static Pressure

Pressure rises above 3.0 in.H2O during
operation. Set point adjustable on the switch.
Used for Off position of switch on smaller
units with one controller

Unit shuts down, indicates alarm

Automatic

CSMUX

CSMUX x.xx Volts outside
limit of x.xx Volts

Compressor safety circuit Resistor Board
reads out of prescribed range for 5 sec.
during operation

Unit shuts down and indicates
alarm

Automatic

CDWF

Check Condenser Water Flow

Waterflow Switch contacts are open at startup,
or go open for 5 sec. during operation.

Compressor Cooling shuts down,
locks out and indicates warning

Automatic

FLTS

Change Filters

Filter pressure drop exceeds Filter Pressure
Switch setting (and contacts open) for 5 sec.

Unit operates normally,
but still indicates Warning

Automatic

FREEZ

Economizer Freeze Condition

Economizer Freeze Switch contacts for 5 sec.
open during operation.

Warning indicated for 15 minutes
turns off ventilation request, then
unit shuts down and Econo valve
opens, pump request stays on,
and Alarm indicated

Automatic

C1_ALM
C2_ALM
C3_ALM
C4_ALM

Compressor 1 Fault
Compressor 2 Fault
Compressor 3 Fault
Compressor 4 Fault

Compressor safety circuit opens for 2 sec.

Unit shuts that compressor down,
and indicates Warning, but retries
2 more times before locking it out.

Automatic

SFS

Check Supply Fan

Duct Pressure Sensor reading is below .3 in.
H2O at 10 sec. after starting fan, or during
operation, or reads above .3

″ when fan is

supposed to be Off.

If on but indicates off cooling,
and heating will be disabled
warning light will be on

Automatic

EWT

EWT xx.x dF outside
limit of xxx.x dF

EWT reads out of prescribed range for 5 sec.
or more

Indicates warning

Automatic

MA_RA

MA_RA xx.x dF outside
limit of xxx.x dF

ma_ra reads out of prescribed range for 5 sec.
or more

Indicates warning

Automatic

PHASE

Phase Loss

Phase monitor activates (see “Phase
Loss/Reversal Protection Switch” on page 5)
for 5 sec. during operation.

Unit shuts down, indicates alarm

Automatic

BYPAS

BYPAS switch in Bypass position or Off,
local remote in Off position