Bryant 547K 04-07 Series Service And Maintenance Instructions page 50

MENU PARAMETER
FREEZE ALARM
SHUTDOWN ACTIVE
DMP CAL RUNNING
ALARMS
(cont)
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 (CO
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 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.
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. After 10 minutes without a command or mode change, the controller will change to normal operation.
g. SETPOINTS —> DRYBLB SET — This point is not displayed if a Return Air (differential) temperature sensor or an Outdoor Air enthalpy sensor is connected.
h. 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.
i. SYSTEM SETUP parameters must be configured as noted for 2-Speed unit operation:
EQUIPMENT = CONV
AUX2 I = 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
For damper minimum position settings and checkout menu
readings, see Table 18. For dry bulb operation with a one-speed
fan, with or without DCV, see Tables 19 and 20. For enthalpy
operation with a one-speed fan, with or without DCV see
Tables 21 and 22. For dry bulb operation with a 2-speed indoor
fan, with or without DCV, see Tables 23 and 24. For enthalpy
operation with a 2-speed indoor fan, with or without DCV, see
Tables 25 and 26.
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
or button causes the display to automatically increment.
50
a (cont)
EXPANDED PARAMETER NAME
b
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 Low Set point on Advanced menu. When
conditions are back in normal range, 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, 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.
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
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