Zonex DigiTract 4 Installation Manual
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Zonex DigiTract 4 Installation Manual

Two stage heat/cool comfort control system
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DigiTract 4
Part #DT4UMAN
Rev. July 2018
Installation Guide
Two Stage Heat/Cool
Comfort Control System
Zoning Systems
That's all we do.

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Summary of Contents for Zonex DigiTract 4

  • Page 1 Installation Guide DigiTract 4 Two Stage Heat/Cool Comfort Control System Zoning Systems That’s all we do. Part #DT4UMAN Rev. July 2018...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS...................................Page INTRODUCTION....................................1 SYSTEM DESCRIPTION ..................................1 COMPONENT SELECTION GUIDE ..............................2 WIRING Gas/Electric ....................................3 Heat Pump ......................................4 Zone Dampers....................................5 SYSTEM CONTROLLERS Gas/Electric Operation..................................6 Status Lights ..................................6 Components ...................................7 Heat Pump Operation..................................8 Components..................................9 Status Lights ..................................10 Fossil Fuel Application ......................

  • Page 3: Introduction

    INTRODUCTION The Digitract 4 zoning system enables up to four room thermostats to control a single HVAC system. This permits superior building temperature control over a standard single thermostat. Any generic thermostat may be used on this control system. When using digital thermostats, they must have “C” terminal for common or be battery powered. Both Programma- ble and Non-Programmable thermostats can be used.

  • Page 4: Component Selection Guide

    COMPONENT SELECTION GUIDE DT4U 4 Zone, Universal Controller for Gas/Electric - 2-Stage Heat/Cool Heat Pump 3- Stage Heat/2-Stage Cool Includes Leaving Air Sensor (LAT) GAS/ELECTRIC HEAT PUMP* OUTSIDE AIR SENSOR For Fossil Fuel Applications (FOAS) GAS/ELECTRIC THERMOSTATS HEAT PUMP THERMOSTATS DIGITAL PROGRAMMABLE DIGITAL...
  • Page 5 DT4U - WIRING SCHEMATIC - GAS/ELECTRIC DigiTract 4 Gas/Electric 2-Stage Heat/Cool Use minimum 18 gauge for all wiring. All wiring must meet stat and local codes. Do not connect Y2 or W2 for single stage heat/cool systems. 120-130 115 125-145 5...
  • Page 6 DT4U - WIRING SCHEMATIC - HEAT PUMP DigiTract 4 Heat Pump 3-Stage Heat / 2- Stage Cool - Wiring and Configura- tion Use minimum 18 gauge for all wiring. All wiring must meet stat and local codes. Do not connect Y2 or W2 for single stage heat/cool systems.
  • Page 7 WIRING ZONE DAMPERS There are three methods of wiring the zone dampers. If necessary, you can mix methods on different zones to suit your application. Method 1: When wiring one to three TR/TREC series dampers to a zone. Method 2: When wiring more than Three TR/TREC series dampers to a zone, use a 24v AC, SPNO relay (Field Supplied). Method 3: When using a ST series damper to a zone, use a 24v AC, SPDT relay (Field Supplied).

  • Page 8: Operation

    The function of the system controller is to receive calls from the zone thermo- The Digitract 4 controller is not to be subjected to tempera- stats, operate the HVAC system in either heat or cool mode tures below 33°F or above 160°F.

  • Page 9: Components

    R), energizes second stage cooling. THERMOSTAT THERMOSTAT THERMOSTAT THERMOSTAT R: HVAC unit 24 V power. Powers the Digitract 4 board and zone thermostats. C: HVAC unit 24V power return. F. Special Function Jumpers GE/HP jumper - Place on proper pins for desired application.

  • Page 10: Operation

    SYSTEM CONTROLLER - HEAT PUMP OPERATION The System Controller will initially run in the mode requested by fan control allows the blower to run for a time, and the initial the first calling zone thermostat. calling zone supply duct returns to ambient temperature. Cool mode Auxiliary heat - When running in the cool mode, the System...

  • Page 11: Components

    THERMOSTAT THERMOSTAT THERMOSTAT R), energizes second stage cooling. R: HVAC unit 24 V power. Powers the Digitract 4 board and zone thermostats. C: HVAC unit 24V power return. E: Board Number - This number indicates the circuit board number and revision. You must know this B.
  • Page 12 SYSTEM CONTROLLER - HEAT PUMP STATUS LED LEGEND STATUS LEDs MODE FUNCTION Power off Power on, blower off, zones satisfied ON/OFF OFF Vent Blower on, compressor(s) off, all zone dampers open ON/OFF OFF Purge Blower off, compressor(s) off, Dampers with LEDs on are closed Y1 Cool 1st stage cool, blower on.

  • Page 13: Fossil Fuel Application

    Left unchecked, the HVAC unit could within operating range. Additionally, for heat pump the freeze up or overheat. To compensate for this, the Digitract 4 Capacity Controller will turn on the heat pump auxiliary heat is furnished with a built in Capacity Controller. The basic...

  • Page 14: Lat And Oas Installation

    LAT AND OAS INSTALLATION CAPACITY CONTOLLER - LAT INSTALLATION Capacity control installation, LAT installation 1. Drill a 3/8” hole in the supply air ahead of the bypass tap. OAS+ A. Gas/Electric application - install sensor as far as possible from the FAU heat OAS- exchanger but still before the bypass tap.

  • Page 15: Zone Dampers

    1.75” differential pressure on any system over 5 tons. ROUND LOW PRESSURE ZONE DAMPERS (TR Series) Zonex Systems round low pressure zone dampers can be used for systems up to 5 tons with a maximum differential static pressure of 0.5”.

  • Page 16: Round

    ZONE DAMPERS ROUND LOW & MEDIUM PRESSURE DAMPER SIZES ROUND LOW PRESSURE DAMPER SIZE DIAMETER (D) LENGTH (L) WIDTH (W) PART # 4" 4" 10" 6" TR04 5" 5" 10" 7" TR05 6" 6" 10" 9" TR06 7" 7" 10" 10"...
  • Page 17 ZONE DAMPERS RECTANGULAR ZONE DAMPERS Rectangular zone dampers are available for the DigiTract 4 controllers in three (3) styles: TREC WxH for low pressure applications (5 tons or less) rated at .5” SP; STMRTD WxH for medium pressure applications up to 7.5 tons, rated at 1” SP;...
  • Page 18 ZONE DAMPERS ZONE DAMPERS LOW AND MEDIUM PRESSURE RECTANGULAR DAMPER DIMENSIONS Part Number TREC W x H and STMRTD W x H 2-1/4" Sizes available from 8” x 6” up to 24” x 20”. 5" 2-1/2" HEAVY DUTY RECTANGULAR DAMPER DIMENSIONS Part Number STCD W x H Sizes available from 8”...

  • Page 19: Installation Notes

    If the ductwork already exists, simply size the damper to fit the ductwork. For new systems or retrofit jobs: c) Select a Zonex Systems damper to fit the duct size selected a) Determine CFM from heat gain or loss calculations.

  • Page 20: Barometric

    BYPASS DAMPERS- BAROMETRIC INSTALLATION BAROMETRIC BYPASS SETUP The round barometric bypass damper can be installed in any a) Turn off all thermostats. position. This damper is factory set for horizontal installation and b) Turn on Controller and set fan switch to “ON” position. can be field modified for vertical installation.

  • Page 21: Electronic

    4” 48” MAXIMUM WIDTH RECTANGULAR BYPASS DAMPER SELECTION The Zonex Systems STCDBP WxH damper is used for rectangular bypass applications. These dampers are also sized for the total system CFM rated at 1500 FPM. Multiple dampers can be slaved from a single static pressure control.
  • Page 22 BYPASS DAMPERS - ELECTRONIC RECTANGULAR BYPASS SELECTION TABLE WIDTH IN INCHES 833 1000 1167 1333 1500 1667 1833 2000 2333 2667 3000 3333 3667 4000 833 1042 1250 1458 1667 1875 2083 2292 2500 2917 3333 3750 4167 4583 5000 1000 1250 1500 1750 2000 2250 2500 2750...

  • Page 23: Bypass Damper With Integrated Pressure Control

    INTEGRATED PRESSURE CONTROL BYPASS DAMPER with INTEGRATED PRESSURE CONTROL (Part # STBP or STCDBP) Bypass Damper with Integrated Pressure Control is used to control bypass operations. The bypass damper modulates to maintain static pressure as zone dampers open and close. The bypass system reduces air noise from the supply registers caused by excessive air velocity.
  • Page 24 INTEGRATED PRESSURE CONTROL Static Pressure Option: The Integrated Pressure BYPASS CHECKOUT FOR STATIC PRESSURE Control Board can be field configured for specified CONTROLLER static pressure using a multi meter and the static pressure – voltage chart. (Exhibit A). This chart Make cool call at the zone thermostat of the shows voltage (DC) to inches of W.C.

  • Page 25: Damper Transformer

    DAMPER TRANSFORMER The 24V transformer connected to TR1 and TR2 of the Digitract 4 System Controller powers the zone dampers. The power rating of the transformer must be sufficient to power the number of dampers used. Also, a properly rated in line fuse must be used on the secondary of the transformer.
  • Page 26 DT4U - STARTUP 18. At next thermostat: 19. At previous zone, turn off thermostat and verify that there is no airflow from register. a. Verify that air is not coming out of register. b. At thermostat: 1. Set power switch to ON, if applicable 20.

  • Page 27: Troubleshooting / Service Checks

    TROUBLESHOOTING AND LAT CHART TROUBLESHOOTING / SERVICE CHECKS Malfunction Probable Cause Corrective Action All thermostats will not call Loss of 24V ac on R and C Repair power source Controller in heat mode Will not initiate cooling cycle Delay prior to changeover Controller in changeover from heat mode 4-minute purge cycle must complete Cooling calls short cycle...
  • Page 28 Factory: (714) 898-9963 • Fax: (714) 898-6802 www.zonexproducts.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 #DT4UMAN Copyright 2018 by Zonex Systems...

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