INSTALLATION INSTRUCTIONS & REPLACEMENT PARTS LIST DC3002 and DC3003 SOLID STATE LEAD/LAG CONTROLLER with DC FAN CONTROL Bard Manufacturing Company, Inc. Bryan, Ohio 43506 Since 1914...Moving ahead, just as planned. Manual No.: Supersedes: File: Date: 2100-484E 2100-484D Vol.
CONTENTS Getting Other Information and Publications 3 DC3000 General Information Shipping Damage .................................................. 4 General .................................................................. 4 Theory of Operation ............................................... 4 Controller Certifications ......................................... 4 Specifications/Features for Basic Controller DC3000 Basic Controller .......................................
Getting Other Information and Publications These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard.
THEORY OF OPERATION ** IMPORTANT ** The equipment covered in this manual is to be installed by trained, experienced service and installation technicians. Please read entire manual before proceeding. SHIPPING DAMAGE Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.
SPECIFICATIONS/FEATURES FOR BASIC 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.
CONTROLLER INPUT/OUTPUT SPECIFICATIONS DC3002/3003 CONTROLLER CONNECTIONS DC3002/3003 CONTROLLER CONNECTIONS Located on Main Controller Board Located on Internal Alarm Board AB3002 C – 24VAC common R – 24VAC hot G – fan (Form A, NO) Y1 – 1st-stage cool (Form A, NO) Y2 – 2nd-stage cool (Form A, NO) W – heat (Form A, NO) Unit #2 C – 24VAC common R – 24VAC hot G – fan (Form A, NO) Y1 – 1st-stage cool (Form A, NO) Y2 – 2nd-stage cool (Form A, NO) W – heat (Form A, NO) Unit #3 C – 24VAC common (DC3003 only R
LOW VOLTAGE FIELD WIRING STAGING DELAY PERIODS The DC3000 is powered from the air conditioners that it is controlling, 24VAC (18-32V) low voltage only. The following delays are built in for both cooling and heating: Circuitry in the DC3000 isolates the power supplies of all connected air conditioners so that no back feeds or phasing problems can occur. Additionally, if any air conditioner loses power, the DC3000 and the other air conditioner are unaffected and will continue to operate normally.
HUMIDITY CONTROL OPTION Note: This function is not available if controller is configured for heat pump. The standard air conditioning system can be adapted to perform dehumidification control by addition of a simple humidity controller that closes-on-rise, and is connected to terminals H1 and H2 on the main controller board. Recommended Bard part number is 8403-038 (H600A 1014). See appropriate connection diagram Figures 1, 2 or 3 for this connection.
SEQUENCE OF OPERATION – HEATING (AIR CONDITIONERS W/ELECTRIC HEAT) First stage heating set point is the dead band setting below first stage cooling set point (the SP entered into the program). The dead band is adjustable from 2-20F (1-10C), and the factory default is 10F (5C). Second stage heating set point is 2F (1C) cooler than Stage 1. DC3003 only: Stage 3 heat is the electric heater in HVAC #3.
DC FAN CONTROL The primary reason the DC30002 or DC3003 controller system would be used is for additionally controlling a DC Fan ventilation system installed in the shelter in addition to controlling either 2 or 3 HVAC units. The DC Fan package and intake system is independent of the HVAC systems, and is supplied by others. A DC Fan pilot-duty control relay, Form C (SPDT) rated at 1A is incorporated into both DC3002 and DC3003 alarm boards for this purpose.
FIGURE 1 DC3002 CONNECTION DIAGRAM 2 UNITS WITH ECONOMIZERS Manual Page 2100-484E 11 of 22
FIGURE 2 DC3002 CONNECTION DIAGRAM 2 UNITS NO ECONOMIZERS Manual 2100-484E Page 12 of 22
FIGURE 3 DC3003 CONNECTION DIAGRAMS 3 UNITS WITH ECONOMIZERS Manual Page 2100-484E 13 of 22
FIGURE 4 DC3003 CONNECTION DIAGRAMS 3 UNITS WITH ECONOMIZERS (NO ECONOMIZER A/C #3) Manual 2100-484E Page 14 of 22
FIGURE 5 DC3003 CONNECTION DIAGRAMS 3 UNITS WITH NO ECONOMIZERS Manual Page 2100-484E 15 of 22
ALARM WIRING 2ND STAGE COOLING ALARM Alarm relays can be wired for NO (close on alarm) or NC (open on alarm) strategy. This alarm output is available for use if desired. It is important to note that in some installations, due to A/C system sizing and internal heat load, that the secondary (lag) air conditioning unit may be called upon to assist the lead air conditioner some of the time.
FIGURE 6 ALARM BOARD CONNECTIONS FOR NORMALLY CLOSED "NC" OPEN-ON-ALARM STRATEGY Manual Page 2100-484E 17 of 22
FIGURE 7 ALARM BOARD CONNECTIONS FOR NORMALLY OPEN "NO" CLOSE-ON-ALARM STRATEGY Manual 2100-484E Page 18 of 22
PROGRAMMING INSTRUCTIONS To swap lead and lag unit positions, press the ADVANCE button. To enter the Program mode, press the PROGRAM button and release it when the message PROG appears on the display. When in Program mode, the DOWN and UP arrows are used to scroll through the programming steps. NOTE: When using the UP and DOWN arrows, push for approximately 1 second until the alternating display goes blank, then release and display will alternate between the step function and setting.
1st Stage 2nd Stage 3rd Stage 4th Stage 1st Stage 2nd Stage 3rd Stage 4th Stage Alarms Note: On the DC3003 version the Lead/Lag Controller alarm light will "Flash" if Unit #3 has Power Loss or Refrig. Alarm. Open cover to observe Fault light that is on the alarm board located inside. Cooling Heating Digital Display Lead Unit Unit #1 Dehumid. Operation Unit #2 Power Loss Sys. 1 Refrig. Alarm Sys. 1 On Off Fire/Smoke Alarm Low Temp.
FIGURE 8 PARTS LIST DESCRIPTION DIAGRAM 1 10 8 6 11 3 2 4 5 7 9 SEXP-445 B Manual Page 2100-484E 21 of 22
TABLE 2 Parts List Manual 2100-484E Page 22 of 22 D w g. N o. Part No.