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Zonex DIGI3U Installation Manual

Three-zone, universal controller for gas/electric or heat pump applications
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Part #D3MAN
October 2011
Installation Guide
DIGI3U
Three-Zone, Universal Controller for
Gas/Electric or Heat Pump Applications
Controller
for the "RNC"
Zoning Systems
That's all we do.
3-Zone
Market

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Summary of Contents for Zonex DIGI3U

  • Page 1 Installation Guide DIGI3U Three-Zone, Universal Controller for Gas/Electric or Heat Pump Applications 3-Zone Controller for the “RNC” Market Zoning Systems That’s all we do. Part #D3MAN October 2011...

  • Page 2: System Description

    DIGI3U is an economical auto-changeover 2 or 3 zone controller, perfect for residential RNC construction or smaller zoning systems. The DIGI3U is a universal board that is field configurable for Gas/Electric or Heat Pump applications. The DIGI3U provides Emergency Heat control and an optional LAT providing capacity control while protecting the coil from freezing or the heat exchanger from premature failure.

  • Page 3: Thermostat Information

    2. Gas/Electric applications – install sensor as far as possible from the FAU heat exchanger but still before the bypass tap. 5. Run wire from the LAT sensor to S S terminals on DIGI3U controller. Insert one wire under each S terminal, and tighten terminal screw.
  • Page 4 WIRING – GAS/ELECTRIC DIGI3U Follow this diagram for Gas/Electric applications. DIGI3U CONTROL CHIP JP1 JP2 DPR1 DPR2 O/B W DPR3 BYPASS AIRFLOW DAMPER W-O/B W-O/B STAT 1 STAT 2 STAT 3 POWER SWITCH R Y O/B W2 G C R Y W G C...
  • Page 5 WIRING – HEAT PUMP DIGI3U Follow this diagram for Heat Pump applications. DIGI3U CONTROL CHIP JP1 JP2 DPR1 DPR2 O/B W DPR3 BYPASS AIRFLOW DAMPER W-O/B W-O/B STAT 1 STAT 2 STAT 3 POWER SWITCH R Y O/B W2 G C...
  • Page 6 WIRING – ZONE DAMPERS Wiring One TR Series Damper to a Zone SERIES DIGI3U DAMPER SYSTEM CONTROLLER Fused 24V 40VA Transformer. Transformer and 2 amp fuse. Wiring Up to Three TR Series Dampers to a Zone SERIES DIGI3U DAMPER SYSTEM...

  • Page 7: Gas/Electric Operation

    SYSTEM CONTROLLER OPERATIONS – DIGI3U GAS/ELECTRIC OPERATION Configure the DIGI3U for GE operation. Jumper JP2 must be placed in GE position on controller. This will allow controller to control gas fur- naces and electric heat air handlers and cooling condensers.
  • Page 8 SYSTEM CONTROLLER OPERATIONS – DIGI3U Changeover Gas/Electric: While controller is operating in heat or cool, Purge Mode: When all calls are satisfied or a changeover occurs, a if another thermostat places a call for the opposite mode, a changeover 3-minute recycle delay will be initiated. During this time, the controller sequence will begin.

  • Page 9: Heat Pump Operation

    SYSTEM CONTROLLER OPERATIONS – DIGI3U HEAT PUMP OPERATION Configure DIGI3U for heat pump operations. Place jumpers JP1 and JP2 in desired position: JP1 “O,” reversing valve for cooling (“B” position will energize reversing valve in heating), JP2 set in HP position.
  • Page 10 SYSTEM CONTROLLER OPERATIONS – DIGI3U Emergency Heat Operation: To put the Heat Pump system into Purge Mode: When all calls are satisfied or a changeover occurs, a Emergency Heat, the mode selector switch on the Heat Pump thermostat 3-minute recycle delay will be initiated. During this time, the controller (STAT 1), must be placed in the Emergency Heat position and must then will not process any calls for heat or cool;...
  • Page 11 When energized, powers zone damper 2 closed. disconnected from the DIGI3U and thermostats. When ON, power from 3 3: Zone damper 3. the HVAC unit transformer is supplied to the DIGI3U and the zone When energized, powers zone damper 3 closed. thermostats.

  • Page 12: Zone Dampers

    ROUND LOW PRESSURE ZONE DAMPERS (TR diam) Zonex Systems round low pressure zone dampers can be used for systems up to 5 tons with a max- imum differential static pressure of 0.5”. These are two position, spring open, power close dampers for very simple operation.

  • Page 13: Installation

    BYPASS DAMPERS – BAROMETRIC The barometric bypass damper is for systems 5 tons or under. It utilizes calculated in Step 1. For rectangular barometric dampers, use a a weighted damper blade to maintain constant duct pressure. This ductulator to convert from round to rectangular. allows for easy installation without the need for electrical power or If bypassing more than 2000 CFM, use electronic bypass damper.
  • Page 14 Repeat Step C. e) The barometric bypass damper is now calibrated. DIGI3U TROUBLESHOOTING/SERVICE CHECKS Malfunction Probable Cause Corrective Action...
  • Page 15 10. Repeat steps 8 and 9 for the last zone 3. STARTUP TEST, HEAT PUMP MODE DIGI3U (Verify jumper JP2 is in the HP position on the controller and the LAT sensor is connected to the S S terminals.) 1.
  • Page 16 Quick Quote Web site: www.zonexcontrols.com The easy way to Get Quotes fast PATENTED PRODUCT Zonex Systems reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Part #D3MAN Copyright 2008 by Zonex Systems...

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