Carrier WeatherMaker 50KCQ A04 Series, Инструкции по обслуживанию и техническому обслуживанию

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LEGEND
* Table 20 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 Unit Control Board’s OCCUPANCY jumper to the
ECONO connector and to the W7220’s OCC input terminal.An
external timeclock or relay is re
q uired 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
readings, see Table 21. See Tables 22-25 for enthalpy and dry
bulb operation.
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 AUX1-0 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 20 — 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 — Li q uid 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 21 — Damper Minimum Position Settings and Readings on Checkout Menu
FAN SPEED
DEMAND CONTROLLED
VENTILATION
(CO
2
SENSOR)
SETPOINTS CHECKOUT
1
NO
MIN POS VMAX–HS
N/A N/A
YES
VENT MIN VMAX–HS
VENT MAX VMAX–HS