20
STATUS
(cont)
ERV
3
OFF
ON/OFF
ENERGY RECOVERY UNIT RELAY OUTPUT
Output of AUX terminal; displays only if AUX = ERV
ON = relay closed
OFF = relay open
MECH COOL ON 0
0,1, or 2
Displays stage of mechanical cooling that is active.
FAN SPEED
n/a
LOW or HIGH
SUPPLY FAN SPEED
Displays speed setting of fan on a 2
‒
speed fan unit.
W (HEAT ON)
n/a
ON/OFF
HEAT DEMAND STATUS
Displays status of heat demand on a 2
‒
speed fan unit.
SETPOINTS
MAT SET
53°F (12°C)
38°F to 65°F
(3°C to 18°C);
increment by 1°
MIXED AIR SET POINT
Set point determines where the economizer will modulate the OA damper to
maintain the mixed air temperature.
LOW T LOCK
32°F (0°C)
–45°F to 80°F
(–43°C to 27°C);
increment by 1°
COMPRESSOR LOW TEMPERATURE LOCKOUT
Set point determines outdoor temperature when the mechanical cooling
cannot be turned on. Commonly referred to as the compressor lockout.
DRYBLB SET
63°F (17°C)
48°F to 80°F
(9°C to 27°C);
increment by 1°
OA DRY BULB TEMPERATURE CHANGEOVER SETPOINT
Setpoint determines where the economizer will assume outdoor air
temperature is good for free cooling; e.g.: at 63°F (17°C), unit will economize
at 62°F (16.7°C) and below and not economize at 64°F (17.8°C) and above.
There is a 2°F (1.1°C) deadband.
DRYBULB SET is only displayed if the economizer has a single dry bulb
sensor
DRYBLB DIFF
0°F
0°F to 6°F;
increment by 2°F
Dry bulb Differential will only show if using dual dry bulb - i.e. when an
outdoor air temperature sensor C7250 is attached to OAT terminals and
C7400S sensor is wired to S-Bus and configured for RAT (return air).
Free cooling will be assumed whenever OA temp is at or below RAT minus
this dry bulb setting.
ENTH CURVE
ES3
ES1,ES2,ES3,ES
4, or ES5
ENTHALPY CHANGEOVER CURVE
(Requires enthalpy sensor option)
Enthalpy boundary “curves” for economizing using single enthalpy
DCV SET
1100ppm
500 to 2000ppm;
increment by 100
DEMAND CONTROLLED VENTILATION SET POINT
Displays only if CO
2
sensor is connected. Set point for Demand Control
Ventilation of space. Above the set point, the OA dampers will modulate
open to bring in additional OA to maintain a space ppm level below the set
point.
MIN POS
4.4 V
2 to 10 vdc
VENTILATION MINIMUM POSITION.
Only displayed if controller is set for single speed unit under FAN TYPE, and
if DCV is NOT used.
MIN POS L
6.0V
2 to 10 vdc
VENTILATION MINIMUM POSITION AT LOW SPEED.
Only displays if unit is set for 2 or 3 speed and CO
2
is not used. IF using 2
speed with 1 heat and 1 cool then set for HEATING ventilation. If using 3
speed with 1 heat and 2 cool then set for LOW SPEED COOLING
ventilation.
MIN POS M
5.4V
2 to 10 vdc
VENTILATION MINIMUM POSITION AT MEDIUM SPEED.
Only displays if unit is set for 3 speed with 1 heat and 2 cool, and CO
2
is not
used. Set for HEATING ventilation.
MIN POS M
4.4V
2 to 10 vdc
VENTILATION MINIMUM POSITION AT HIGH SPEED.
Only displays if unit is set for 2 or 3 speed and CO
2
is not used. IF using 2
speed with 1 heat and 1 cool then set for COOLING ventilation. If using 3
speed with 1 heat and 2 cool then set for HIGH SPEED COOLING ventilation
VENTMAX L
6.0 V
2 to 10 vdc
DCV MAXIMUM DAMPER POSITION AT LOW SPEED
Displays only if a CO
2
sensor is connected. Used for Vbz (ventilation max
cfm) set point. Displays 2 to 10 V if <3 sensors (RA,OA, and MA). In AUTO
mode dampers controlled by CFM
VENTMAX M
5.4 V
2 to 10 vdc
DCV MAXIMUM DAMPER POSITION AT MEDIUM SPEED.
Only displays if unit is set for 3 speed with 1 heat and 2 cool. Set for
HEATING ventilation.
VENTMAX H
4.4 V
2 to 10 vdc
DCV MAXIMUM DAMPER POSITION AT HIGH SPEED.
Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IF
using 2 speed with 1 heat and 1 cool then set for COOLING ventilation. If
using 3 speed with 1 heat and 2 cool then set for HIGH SPEED COOLING
ventilation
VENTMIN L
3.7 V
2 to 10 vdc
DCV MINIMUM DAMPER POSITION AT LOW SPEED.
Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IF
using 2 speed with 1 heat and 1 cool then set for HEATING ventilation. If
using 3 speed with 1 heat and 2 cool then set for LOW SPEED COOLING
VENTMIN M
3.4 V
2 to 10 vdc
DCV MINIMUM DAMPER POSITION AT MEDIUM SPEED.
Only displays if unit is set for 3 speed with 1 heat and 2 cool. Set for
HEATING ventilation.
VENTMIN H
2.8 V
2 to 10 vdc
DCV MINIMUM DAMPER POSITION AT HIGH SPEED.
Only displays if unit is set for 2 speed or 3 speed with 1 heat and 2 cool. IF
using 2 speed with 1 heat and 1 cool then set for COOLING ventilation. If
using 3 speed with 1 heat and 2 cool then set for HIGH SPEED COOLING
ventilation
Table 11 — Menu Structure
1
(cont)
MENU
PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
2
NOTES