Carrier WeatherMaker 50KCQ A04 Series, Service And Maintenance Instructions

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SYSTEM
SETUP
INSTALL 01/01/10 N/A
Display order = MM/DD/YY
Setting order = DD, MM, then YY.
UNITS DEG °F °F or °C Sets economizer controller in degrees Fahrenheit or Celsius
EQUIPMENT CONV
CONV
or
HP
CONV = conventional;
HP O/B = Enable Heat Pump mode. Use AUX2 I for Heat Pump
input from thermostat or controller.
AUX2 IN W
Shutdown (SD)
Heat (W1)
HP(O)
HP(B)
In CONV mode:
SD = Enables configuration of shutdown (default);
W = Informs controller that system is in heating mode.
In HP O/B mode:
HP(O) = energize heat pump on Cool (default);
HP(B) = energize heat pump on heat.
FAN SPEED 2 speed 1 speed/2 speed
Sets the economizer controller for operation of 1 speed or 2
speed supply fan. The controller does not control the fan, but
positions the OA and RA dampers to heating or cooling mode.
FAN CFM 5000 cfm
100 to 15000 cfm;
increment by 100
UNIT DESIGN AIRFLOW (CFM)
Enter only if using DCVCAL ENA = AUTO
This is the capacity of the RTU. The value is found on the
nameplate label for the specific unit.
AUX1 OUT NONE
NONE
ERV
EXH2
SYS
Select OUTPUT for AUX1 O relay
• NONE = not configured (output is not used)
• ERV = Energy Recovery Ventilator ††
• EXH2 = second damper position 24 vac out for second exhaust
fan
• SYS = use output as an alarm signal
OCC INPUT INPUT or ALWAYS
OCCUPIED MODE BY EXTERNAL SIGNAL
When using a setback thermostat with occupancy out (24 vac),
the 24 vac is input “INPUT” to the OCC terminal. If no occupancy
output from the thermostat, then change program to “ALWAYS”
OR add a jumper from terminal R to OCC terminal.
FACTORY DEFAULT NO NO or YES
Resets all set points to factory defaults when set to YES. LCD
will briefly flash YES and change to NO but all parameters will
change to the factory default values.
ADVANCED
SETUP
MA LO SET 45°F (7°C)
35°F to 65°F
(2°C to 18°C);
Increment by
1 degree
SUPPLY AIR TEMPERATURE LOW LIMIT
Temperature to activate Freeze Protection (close damper or
modulate to MIN POS if temp falls below set value).
FREEZE POS CLO CLO or MIN
FREEZE PROTECTION DAMPER POSITION
Damper position when freeze protection is active (closed or MIN
POS).
CO2 ZERO 0ppm
0 to 500 ppm;
Increment by 10
CO
2
ppm level to match CO
2
sensor start level.
CO2 SPAN 2000ppm
1000 to 3000 ppm;
Increment by 50
CO
2
ppm span to match CO
2
sensor; e.g.: 500-1500 sensor
output would be 500 CO
2
zero and 1000 CO
2
span.
STG3 DLY 2.0h
0 min, 5 min, 15
min, then 15 min
intervals. Up to
4 hrs or OFF
COOLING STAGE 3 DELAY
Delay after stage 2 cool has been active. Turns on second stage
of cooling when economizer is first stage call and mechanical
cooling is second stage call. Allows three stages of cooling, 1
economizer and 2 mechanical.
OFF = no Stage 3 cooling
SD DMPR POS CLO CLO or OPN
Indicates shutdown signal from space thermostat or unitary
controller. When controller receives 24 vac input on the SD
terminal in conventional mode, the OA damper will open if
programmed for OPN and OA damper will close if programmed
for CLO. All other controls, e.g., fans, etc. will shut off.
DA LO ALM 45°F (7°C)
NONE
35°F to 65°F
(2°C to 18°C);
Increment by 5°F
Used for alarm for when the DA air temperature is too low. Set
lower range of alarm, below this temperature the alarm will show
on the display.
Table 20 — W7220 Menu Structure* (cont)
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT †
EXPANDED PARAMETER NAME
Notes