SPECIFICATIONS/FEATURES FOR BASIC CONTROLLER
MC4000 Basic Controller
•Input power:
•Isolation circuitry: no line or low voltage phasing required
•Backup power: connection for
&alarm relay operation during commercial power outages. •Digital display:
•Temperature display: F or C
•HVAC outputs: Form A (NO) relays (1A @ 24 VAC) •Cooling control stages:
2 for each A/C unit (4 total) when configured for economizers
1 for each A/C unit (2 total) when configured for no economizers
•Heating Control stages:
1 for each A/C unit, 2 for each heat pump if so configured
•Dehumidification circuit: requires optional humidity controller as input signal
•Operating temperature range: 0 to 120F
•Storage temperature range:
•Temperature accuracy: +/- 1F from
+/- 1% outside
•Lead/lag changeover time: 0 to 30 days
•Timing accuracy: +/- 1%
Stage 1 to 2 - Range
•Cooling set point range: 65 to 90F (18.3 to 32.2C) •Comfort
•Fire/smoke interface: standard NC circuit jumper, remove for connection to building system control, shuts down both A/C units immediately
•Memory: EEPROM for set point and changeable parameters (maintains settings on power loss)
•Space temperature sensors: 1 local is standard, will accept up to 2 optional 25' remote sensors, Bard part number
•LEDs for basic controller: Lead unit, Cooling stages 1 through 4, Heating Stages 1 – 4, Dehumidification operation •Six (6)
MOUNTING THE CONTROLLER
Included in the controller carton is the controller and installation instructions.
The controller should be installed on a vertical wall approximately four (4) feet above the
TEMPERATURE SENSORS
The standard (local) temperature sensor has 12" leads and comes installed from the factory.
A secondary sensor is located internally on the main controller board and serves as a reference and
The controller is designed to accept 1 or 2 additional sensors and those have
It is recommended that the sensor lead wires be installed in conduit for protective purposes.
If alarm boards are utilized, the highest reading of any connected sensor will be used for high temperature alarm and the lowest reading sensor will be used for low temperature alarm.
NOTE: All sensors are polarity sensitive. The copper lead must connect to terminal CU, and the silver lead to AG. Sensors are solid state, not RTD. Use only sensors supplied by Bard. Sensor leads can be extended up to 200 feet. Use
TEMPERATURE SENSOR LOGIC
The standard local (LSEn) sensor monitors the temperature at the controller location. If this is the only sensor connected, it will control the temperature
If one or more REMOTE sensors are installed and connected (Rem 1 or Rem 2), the temperature
If multiple temperature sensors are used, the High and Low temperature alarms will be governed by the average of the connected sensors.
Manual | |
Page | 5 of 40 |