Bryant Legacy 549J 12 Series, Руководство по установке

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34
LEGEND
* Table 12 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 setpoint in the setpoint menu.
NOTES:
1. STATUS —> OCCUPIED — The factory-standard Occupancy sig -
nal 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.
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 roof-
top units, the economizer control sensor is located downstream of
the evaporator/indoor coil in the supply fan section where this sen-
sor 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
readings, see Table 13. See Tables 14-21 for dry bulb and en -
thalpy sequence of operation.
ALARMS
(cont)
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
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 12 — 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 13 — 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 VMIN – HS
VENT MAX VMAX – HS
2
VENT MIN H VMIN – HS
VENT MAX H VMAX – LS
VENT MIN L N/A
VENT MAX L N/A