Manual 2100-746
Page
18 of 55
OPERATION
Basic Controller Specifications/
Features
• Input power: 18-32 VAC, 60/50Hz, power is
supplied from A/C #1 and/or A/C #2, etc., through
all units. If one unit loses power, the next unit
powers the system.
• Full color touch screen display
• Temperature display: Fahrenheit or Celsius
• HVAC outputs: Form A (NO) relays (2A @ 24 VAC)
• Cooling control stages: Varies by option and
number of units.
• Dehumidification circuit: User selectable. For
Synchronized Dehumidification, it is selected in
pairs 2, 4, 6. For mechanical HGR systems, from
one to six can be selected.
• Operating temperature range: -4°F to 155°F (-20
to 68°C)
• Storage temperature range: -22 to 160°F (-30 to
71°C)
• Temperature accuracy: +/- 1°F from 60-85°F (16-
30°C); +/- 1% outside 60-85°F
• Lead/lag changeover time: 0 to 30 days
• Timing accuracy: +/- 1%
• Interstage time delay: 5 seconds between stages
• Interstage differential: .5°F to 5°F
• Cooling set point range: 64 to 90°F
• Comfort setting: Cooling 72°F (22°C), heating
68°F (20°C), for 1 hour
• Deadband (difference between cooling and heating
set points): 4°F + ISD
• Emergency Off interface: Standard NC circuit
jumper, remove for connection to building
system control, shuts down outputs to all units
immediately, configurable for NC or NO input.
• Memory: EEPROM for set point and changeable
parameters (maintains settings on power loss)
• Space temperature sensors: One (1) local
temperature/humidity sensor (11") is standard
with all models. If temperature/humidity sensor
placement requires more distance, an optional 35'
temperature/humidity sensor (P/N 8408-061) is
available. The MC5000 will also accept up to two
(2) optional 35' remote temperature-only sensors
(P/N 8301-095). When multiple sensors are used,
temperatures are averaged by default.
• Outdoor temperature sensor: One (1) remote
temperature sensor can be added for outdoor
temperature sensing. The outdoor sensor is a 35'
remote temperature-only sensor (P/N 8301-095).
The sensor is attached on the main I/O board to
the REM 2 terminals. If using the remote sensor
for outdoor temperature, it must be utilized if the
heat pump lockout option is being used.
• Controller enclosure: 16-gauge post-painted
galvanized, 16" W x 22" H x 6" D, hinged cover,
twenty (20) various sized electrical knockouts.
• System status is displayed on the color touchpad.
• The system is set up and accessed through the use
of the touchpad.
Temperature Sensors
One (1) standard (local) temperature/humidity sensor
with 11" cable comes installed from the factory. An
optional temperature/humidity sensor with 35' cable
(Bard P/N 8408-061) is available that can be remotely
mounted.
Only one temperature/humidity sensor can be
connected to the controller at any given time.
The controller is designed to accept one or two
additional optional temperature-only sensors. The Bard
part number for the optional temperature-only sensor
is 8301-095. The temperature-only sensors come
with 35' cable. They can be installed as required in
the structure to address hot spots, barriers to airflow,
etc. The local sensor remains active, even with the
additional optional remote sensors being used.
It is recommended that the sensor lead wires be
installed in conduit for protective purposes.
NOTE:
Bard recommends adding at least one remote
sensor for redundancy. If either sensor fails, the
other will take over.
NOTE:
8301-095 temperature-only sensors are not
polarity sensitive.
See page 5 for additional information on optional
sensors.
Temperature Sensor Logic
The standard local sensor monitors the temperature
and humidity at the controller location. If this is the
only sensor connected, the sensor will control the
temperature and humidity of the conditioned space
(building).
If one or more additional remote sensors are installed
and configured (Rem 1 or Rem 2), the temperature will
be controlled, to an average (default) of all connected
sensors (highest or lowest are options). The controller
can be configured to be governed by the hottest sensor
for cooling and the coldest sensor for heating.
