19
Since 1965
MicroMetl
Table 11 ─ Menu Structure
(cont)*
v
Menu Parameter
Parameter
Default
Value
Parameter
Range and
Increment
b
Notes
STATUS
(cont)
EXH2 OUT OFF ON/OFF EXHAUST STAGE 2 RELAY OUTPUT
Output of AUX terminal; displays only if AUX = EXH2
ON = relay closed
OFF = relay open
ERV 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° to 70°F;
(3° to 18°C)
increment by 1
MIXED AIR SETPOINT
Setpoint determines where the economizer will modulate the OA damper to maintain the mixed air tempera-
ture.
LOW T LOCK 32°F
(0°C)
-45° to 80°F;
( -43° to 27°C)
increment by 1
COMPRESSOR LOW TEMPERATURE LOCKOUT
Setpoint determines outdoor temperature when the mechanical cooling
cannot be turned on.
DRYBLB SET 63°F
(17°C)
48° to 80°F
(9° 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 DIF
(Available rmware 1.15,
June 2018 and later)
0°F 0 to 6°F
Increment by 2
Drybulb Dierential will only show if using dual drybulb, i.e., when an outdoor air temperature sensor C7250
is attached to OAT terminals, and a C7400S enthalpy sensor is wired to S-Bus and congured for RAT (re-
turn air). Free cooling will be assumed whenever OA temp is at or below RAT minus this drybulb dierential
setting.
ENTH CURVE ES3 ES1, ES2, ES3,
ES4, or ES5
ENTHALPY CHANGEOVER CURVE
(Requires enthalpy sensor option)
Enthalpy boundary “curves” for economizing using single enthalpy.
DCV SET 1100ppm 500 to 2000 ppm;
increment by 100
DEMAND CONTROL VENTILATION SETPOINT
Displays only if CO2 sensor is connected. Setpoint for Demand Control
Ventilation of space. Above the setpoint, the OA dampers will modulate
open to bring in additional OA to maintain a space ppm level below the
setpoint.
MIN POS 2.8 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 3.2 V 2 to 10 Vdc VENTILATION MINIMUM POSITION AT LOW SPEED
Displays ONLY if used on 2 speed units and CO2 sensor is NOT used.
MIN POS H 2.8 V 2 to 10 Vdc VENTILATION MINIMUM POSITION AT HIGH SPEED
Displays ONLY if used on 2 speed units and CO2 sensor is NOT used.
VENTMAX L 2.8 V 2 to 10 Vdc DCV MAXIMUM DAMPER POSITION AT LOW SPEED
(Requires CO2 sensor connected)
VENTMAX H 4.4 V 2 to 10 Vdc DCV MAXIMUM DAMPER POSITION AT HIGH SPEED
(Requires CO2 sensor connected)
VENTMIN L 2.25 V 2 to 10 Vdc DCV MINIMUM DAMPER POSITION AT LOW SPEED
(Requires CO2 sensor connected)
VENTMIN H 2.8 V 2 to 10 Vdc DCV MINIMUM DAMPER POSITION AT HIGH SPEED
(Requires CO2 sensor connected)
ERV OAT SP 32°F
(0°C)
0° to 50°F;
( -18° to 10°C)
increment by 1
ENERGY RECOVERY VENTILATION UNIT OUTDOOR AIR
TEMPERATURE SETPOINT
Only displayed when AUX1 O = ERV
EXH1 SET 50% 0 to 100% Exhaust fan set point for single speed units. Based on OA Damper position to activate power exhaust.
EXH1 L SET 65% 0 to 100%;
Increment by 1
EXHAUST FAN SETPOINT AT LOW SPEED (on 2 speed unit)
Setpoint for OA damper position when exhaust fan is powered by the
economizer
EXH1 H SET 50% 0 to 100%;
Increment by 1
EXHAUST FAN SETPOINT AT HIGH SPEED (on 2 speed unit)
Setpoint for OA damper position when exhaust fan is powered by the
economizer
EXH2 L SET 80% 0 to 100%;
Increment by 1
EXHAUST FAN STAGE 2 SETPOINT AT LOW SPEED
Setpoint for OA damper position when exhaust fan 1 is powered by the
economizer. Only used when AUX1‒O is set to EHX2. Note: Standard power exhaust kits have only 1 speed,
therefore EXH2 is not applicable
EXH2 H SET 75% 0 to 100%;
Increment by 1
EXHAUST FAN STAGE 2 SETPOINT AT HIGH SPEED
Setpoint for OA damper position when exhaust fan 1 is powered by the
economizer. Only used when AUX1‒O is set to EHX2. Note: Standard power exhaust kits have only 1 speed,
therefore EXH2 is not applicable
Note: MIN POS defaults may vary on some models.
* Table 11 illustrates the complete hierarchy. your menu parameters may be different depending on your configuration.
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