Manual 2100-484E
Page 5 of 22
SPECIFICATIONS/FEATURES FORBASIC CONTROLLER
DC3000 Basic Controller
•Input power: 18 to 32VAC, 60/50Hz, power is supplied
from A/C #1 and/or A/C #2
•Isolation circuitry: no line or low voltage phasing
required
•Backup power: connection for -24VDC or -48VDC
(-20 to -56V) maintains microprocessor operation, front
panel indication, and alarm relay operation during
commercial power outages.
•Digital display: 4-character LCD
•Temperature display: F or C
•HVAC outputs: Form A (NO) relays (1A @ 24VAC)
•Cooling control stages: 2 for each A/C unit
•Heating Control stages: 1 for each A/C unit
•Dehumidification circuit: requires optional humidity
controller as input signal.
•Operating temperature range: 0 to 120F (-18 to 49C)
•Storage temperature range: -20 to 140F (-29 to 60C)
•Temperature accuracy: +/- 1F from 60-85F (16-30C)
+/- 1% outside 60-85F
•Lead/lag changeover time: 0 to 30 days
•Timing accuracy: +/- 1%
•Inter-stage time delay: 10 seconds between stages
•Inter-stage differential: 2F (1C) for all modes
•On-Off differential: 2F (1C) is standard, 4F (3C) when
“excessive cycling” mode is enabled.
•Cooling set point range: 65 to 90F (18 to 32C)
•Comfort setting-Cooling 72F (22C), Heating 68F(20C),
for 1 hour.
•Dead band (difference between cooling and heating set
points): 2F to 20F (1C to 10C)
•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).
•Temperature sensors: 1 local is standard, will accept up to
2 optional 25-foot remote sensors, Bard part number
8612-023. One can be used for remote indoor sensor and
one is dedicated for outdoor sensor for DC Fan free
cooling operation, if desired.
•Controller Enclosure: 20-gauge pre-painted steel, 9.25"W
x 13.50"H x 3.00"D, hinged cover, thirteen (13) .875"
diameter electrical knockouts.
•LEDs for basic controller: Lead unit, Cooling stages 1
through 4, Heating Stages 1 through 4, Dehumidification
operation. DC3003 has cooling stage and alarm LED’s
displayed internally for HVAC #3.
•Six (6) Push-button controls: On/Off switch-Change lead
unit-Increase and Decrease set points-Program/Save-
Comfort.
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 floor - away
from drafts and outside doors or windows. Four (4)
mounting holes are provided for mounting to the wall,
and 7/8" holes for conduit connections are provided in
both the base, sides and top of the controller.
TEMPERATURE SENSORS
The standard (local) temperature sensor has 12" leads
and comes installed from the factory.
The controller is designed to accept 1 additional
remote indoor sensor, and connects to “Rem 1”. The
Bard part number for the optional sensor with 25-foot
leads is 8612-023. This remote indoor sensor can be
installed as required in the structure to address hot
spots, barriers to airflow, etc. It can also be used as
the local sensor
Outdoor sensor, same 8612-023 with 25-foot leads, is
required for non-economizer installations when DC
fan is to be used for free cooling. This sensor
connects to the “Out” terminals.
It is recommended that the sensor lead wires be
installed in conduit for protective purposes.
The highest reading of any connected indoor sensor
will be used for high temperature alarm and the lowest
reading sensor will be used for low temperature alarm.
TEMPERATURE SENSOR LOGIC
The standard local (Loc) sensor monitors the
temperature at the controller location. If this is the
only sensor connected, it will control the temperature
read-out, the space (building) temperature, and also be
used for Low and High Temperature alarm functions.
If one REMOTE sensor is installed and connected
(Rem 1), the temperature read-out will display and the
building will be controlled to an average of connected
sensors. If there is more than 10F difference from the
highest to the lowest connected sensor, the actual
control will be governed by the hottest sensor for
cooling and the coldest sensor for heating.
If two indoor temperature sensors are used, the
average of the two sensors becomes the controller
cooling and testing set point.
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.