36
LEGEND
* Table 11 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.
† When values are displayed, pressing and holding the or but-
ton causes the display to automatically increment.
** N/A = Not Applicable.
†† 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.
NOTES:
1. 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 OCCUPANCY jumper
JMP2 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.
2. 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 down-
stream of the evaporator/indoor coil in the supply fan section where
this sensor is designated as Supply Air Temperature (SAT) sensor.
3. SETPOINTS —> DRYBLB SET — This point is not displayed if a
Return Air (differential) temperature sensor or an Outdoor Air en-
thalpy sensor is connected.
4. SYSTEM SETUP parameters must be configured as noted for 2-
Speed unit operation:
EQUIPMENT = CONV
AUX2 IN = W
FAN SPEED = 2SPEED
For damper minimum position settings and checkout menu
readings, see Table 12. For dry bulb operation with a 1 speed in-
door fan, with or without DCV, see Tables 13 and 14. For enthal-
py operation with a 1 speed indoor fan, with or without DCV, see
Tables 15 and 16.
ALARMS
Alarms display only when they are active. The menu title “ALARMS(#)” includes the number of active alarms in parenthesis ( ). When using SYLK bus
sensors, “SYLK” will appear on the screen, and when using 20k OA temperature sensors, “SENS T” will appear on the screen
MA T SENS ERR N/A N/A SUPPLY AIR TEMPERATURE SENSOR ERROR
Mixed air sensor has failed or become disconnected - check wiring then
replace sensor if the alarm continues.
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 wir-
ing 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 Set-
point 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 AUX1-0 is set to SYS and there is any alarm (e.g., failed sensors,
etc.), the AUX1-0 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.
Table 11 — Menu Structure* (cont)
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
†
NOTES
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
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