34
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
button
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 Heat-
ing mode, the ERV terminal will be energized when the OA is below
the ERV OAT set point in the set point menu.
*** After 10 minutes without a command or mode change, the controller
will change to normal operation.
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 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 downstream
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
enthalpy sensor is connected.
4.
SYSTEM SETUP parameters must be configured as noted for 2-
Speed unit operation:
EQUIPMENT = CONV
AUX2 I = W
FAN SPEED = 2SPEED
For damper minimum position settings and checkout menu read-
ings, see Table 12. For dry bulb operation with a 1-speed fan, with
or without DCV, see Tables 13 and 14. For enthalpy operation
with a 1-speed fan, with or without DCV, see Tables 15 and 16.
For dry bulb operation with a 2 speed indoor fan, with or without
DCV, see Tables 17 and 18. For enthalpy operation with a 2 speed
indoor fan, with or without DCV, see Tables 19 and 20.
ALARMS
(CONT)
FREEZE ALARM
N/A
N/A
Check if outdoor temperature is below the LOW Temp Lockout on
set point 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, 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, this alarm will display
when the W7220 is completing a calibration on the dampers.
Wait until the calibration is completed and the alarm will go away.
Must have OA, MA and RA sensors for DCV calibration; set up is
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.
Table 11 — W7220 Menu Structure* (cont)
MENU
PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
†
EXPANDED PARAMETER NAME
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
Table 12 — Damper Minimum Position Settings and Readings on Checkout Menu
DEMAND CONTROLLED
VENTILATION
(CO
2
SENSOR)
FAN SPEED
SETPOINTS
CHECKOUT
NO
1
MIN POS
VMAX–HS
N/A
N/A
2
MIN POS H
VMAX–HS
MIN POS L
VMAX–LS
YES
1
VENT MIN
VMAX–HS
VENT MAX
VMAX–HS
2
VENT MIN H
VMAX–HS
VENT MAX H
VMAX–LS
VENT MIN L
N/A
VENT MAX L
N/A
