Carrier 50GCQ Series Service And Maintenance Instructions page 50

MENU PARAMETER
DA SYLK T ERR
OA SENS T ERR
ACT ERROR
FREEZE ALARM
SHUTDOWN ACTIVE
ALARMS
(CONT) DMP CAL RUNNING
DA SENS ALM
SYS ALARM
ACT UNDER V
ACT OVER V
ACT STALLED
NOTE(S):
a. This table illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration. For example if you do not have a DCV (CO2)
sensor, then none of the DCV parameters appear.
b. When values are displayed, pressing and holding the
c. STATUS OCCUPIED — The factory-standard Occupancy signal originates with a thermostat or other controller call for indoor fan operation at UCB terminal G. This
signal passes through the Unit Control Board's OCCUPANCY jumper to the ECONO connector and to the W7220's OCC input terminal. An external timeclock or relay is
required to implement an Occupancy schedule on the economizer damper position.
d. N/A = Not Applicable.
e. STATUS  MA TEMP, SETPOINTS  MAT SET — The W7220 menu parameters and labels include designations MA, MAT and Mixed Air for the economizer cooling
control sensor. On these rooftop units, the economizer control sensor is located downstream of the evaporator/indoor coil in the supply fan section where this sensor is
designated as Supply Air Temperature (SAT) sensor.
SETPOINTS  DRYBLB SET — This point is not displayed if a Return Air (differential) temperature sensor or an Outdoor Air enthalpy sensor is connected.
f.
g. ERV Operation: When in cooling mode AND the conditions are NOT OK for economizing — the ERV terminal will be energized. In the Heating mode, the ERV terminal
will be energized when the OA is below the ERV OAT setpoint in the setpoint menu.
h. SYSTEM SETUP parameters must be configured as noted for Multi-Speed unit operation: 
EQUIPMENT = CONV
AUX2 IN = W
FAN SPEED = 2SPEED
NOTE: 1SPEED, 2SP H/C and 3SPEED are not used on 50GCQ units.
LEGEND
CLO — Compressor Lockout
ERV — Energy Recovery Ventilator
LCD — Liquid Crystal Display
MA — Mixed Air
MAT — Mixed Air Temperature
N/A — Not Applicable
OA — Outdoor Air
OAT — Outdoor Air Temperature
OCC — Occupied
RA — Return Air
RAT — Return Air Temperature
RTU — Rooftop Unit
SYS — System
Table 17 — W7220 Menu Structure
PARAMETER PARAMETER
DEFAULT RANGE AND
VALUE INCREMENT
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
or button causes the display to automatically increment.
50
a (cont)
b
DISCHARGE AIR S-BUS SENSOR ERROR
Discharge air sensor has failed or become disconnected — check
wiring then replace sensor if the alarm continues.
OUTSIDE AIR TEMPERATURE SENSOR ERROR
Outdoor air temperature sensor has failed or become disconnected —
check wiring then replace if the alarm continues.
ACTUATOR ERROR
Actuator has failed or become disconnected — check for stall, over
voltage, under voltage and actuator count. Replace actuator if damper
is movable and supply voltage is between 21.6-v and 26.4-v. Check
actuator count on STATUS menu.
Check if outdoor temperature is below the LOW Temp Lockout on
setpoint menu. Check if Mixed air temperature on STATUS menu is
below the Lo Setpoint on Advanced menu. When conditions are back
in normal range then the alarm will go away.
AUX2 IN is programmed for SHUTDOWN and 24-v has been applied
to AUX2 IN terminal.
DAMPER CALIBRATION ROUTINE RUNNING
If DCV Auto enable has been programmed, when the W7220 is
completing a calibration on the dampers, this alarm will display. Wait
until the calibration is completed and the alarm will go away. Must have
OA, MA, and RA sensors for DCV calibration; set up in the Advanced
setup menu.
DISCHARGE AIR TEMPERATURE SENSOR ALARM
Discharge air temperature is out of the range set in the ADVANCED
SETUP Menu. Check the temperature of the discharge air.
When AUX1-O is set to SYS and there is any alarm (e.g., failed
sensors, etc.), the AUX1-O terminal has 24 vac out.
ACTUATOR VOLTAGE LOW
Voltage received by actuator is above expected range.
ACTUATOR VOLTAGE HIGH
Voltage received by actuator is below expected range.
ACTUATOR STALLED
Actuator stopped before achieving commanded position.
NOTES