65
ALARMS
(cont)
CO2 SENS ERR N/A N/A
CO
2
SENSOR ERROR
CO
2
sensor has failed, gone out of range or become disconnected -
check wiring then replace sensor if the alarm continues.
OA SYLK T ERR N/A N/A OUTSIDE AIR S-BUS SENSOR ERROR
Outdoor air enthalpy sensor has failed or become disconnected - check
wiring then replace sensor if the alarm continues.
OA SYLK H ERR N/A N/A
RA SYLK T ERR N/A N/A RETURN AIR S-BUS SENSOR ERROR
Return air enthalpy sensor has failed or become disconnected - check
wiring then replace sensor if the alarm continues.
RA SYLK H ERR N/A N/A
DA SYLK T ERR N/A N/A
DISCHARGE AIR S-BUS SENSOR ERROR
Discharge air sensor has failed or become disconnected - check wiring
then replace sensor if the alarm continues.
OA SENS T ERR N/A N/A
OUTSIDE AIR TEMPERATURE SENSOR ERROR
Outdoor air temperature sensor has failed or become disconnected -
check wiring then replace if the alarm continues.
ACT ERROR N/A N/A
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.
FREEZE ALARM N/A N/A
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.
SHUTDOWN ACTIVE N/A N/A
AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to
AUX2 IN terminal.
DMP CAL RUNNING N/A N/A
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.
DA SENS ALM N/A N/A
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.
SYS ALARM N/A N/A
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.
ACT UNDER V N/A N/A
ACTUATOR VOLTAGE LOW
Voltage received by actuator is above expected range.
ACT OVER V N/A N/A
ACTUATOR VOLTAGE HIGH
Voltage received by actuator is below expected range.
ACT STALLED N/A N/A
ACTUATOR STALLED
Actuator stopped before achieving commanded position.
a. Table 19 illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration. For example if you do not have a DCV (CO
2
) sensor,
then none of the DCV parameters appear.
b. When values are displayed, pressing and holding the ▲ or ▼ button causes the display to automatically increment.
c. STATUS —> OCCUPIED — The factory-standard Occupancy signal originates with a thermostat or other controller call for indoor fan operation at CTB terminal G. This
signal passes through the Central Terminal Board’s OCCUPIED jumper JMP1 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.
f. SETPOINTS —> DRYBLB SET — This point is not displayed if a Return Air (differential) temperature sensor or an Outdoor Air enthalpy sensor is connected.
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 set point in the set point menu.
h. SYSTEM SETUP parameters must be configured as noted for Multi-Speed unit operation:
EQUIPMENT = CONV
AUX2 IN = W
FAN SPEED = 2SPEED
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 19 — W7220 Menu Structure
a
(cont)
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
b
NOTES
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