DSC TZ45A Installation Guide

Guide TZ45A Thermostat thermostat is compatible with most HVAC systems including the following systems Note requires both the 24R and 24C common wires gas oil electric heating systems stage heating and cooling stage heating and cooling Pump systems stage heating and cooling stage heating and cooling or 3rd stage Auxiliary heating heat strips NOT use for line voltage controls 120 240VAC Before removing your existing thermostat be sure to label the with the terminal markings on the old thermostat and record them HVAC System Wiring Wire Color Record the old thermostat wire and terminal here Common Return Fan or W1 Heat stage 1 or Y1 Cool stage 1 Heat stage 2 Cool stage 2 Pump HVAC System Wiring Wire Color Record the old thermostat wire Common Return Fan or W1 Aux Heat or Y1 Compressor stage 1 Yellow or B Compressor stage 2 Black if you have a terminal marked with a brown wire attached to it that means you have a C O with heating type heat pump system Be sure to set the change over in the Installer Settings menu to C O Type w Heat Otherwise leave it set to and terminal here Over Valve brown 140 02034 03 1 Selection Settings Setpoints Install Info and hold two middle buttons to enter the Installer Settings screen HVAC System Setup thermostat requires that you setup the type and configuration of your HVAC system for operation This is done in the Thermostat Info screen Setup button or the Installer screen on the thermostat The Installer Settings is a hidden screen To access it the main menu button and when the main menu screen appears press and hold the two buttons for 5 seconds Main Menu Settings screen Settings operating the system you must configure the thermostat for the correct HVAC type You will need to know the following information to correctly configure the The HVAC setup is in the Mechanical Settings menu screen system type What type HVAC system do you have Standard or Heat pump Standard systems Fan Type Do you have Gas heat or Electric heat Heat Pump systems Change over valve or reversing valve type Does your system over with cooling operation or with heating operation Check your existing Lock N Mode Settings Heat SP 90 Settings 140 02034 03 2 N N Mode Y or N Y or N connects to help determine this If the original system had an orange wire to an terminal then you have a with cool system If you have brown wire connected to the terminal then you have a over with heat Settings Menu items Lock Display LOCKED Display unlocked you to lock or unlock the thermostat buttons When the buttons are locked you can access the main menu but you will not be allowed to select any menu options The Settings hidden button operation is always operational allowing you to return to screen and turn Display Lock off Mode Test mode on Reduces all delays to 10 sec for quicker system testing Test mode off Normal system delays in test mode all system safety delays are shorten Do not operate the compressor in test mode Disconnect Y1 or Y2 outputs if using test mode a live system Settings Submenu Sets the HVAC operational settings below Settings Submenu Sets HVAC system type and configuration HVAC type Gas Electric or Heat pump Type the Fan type if system is Gas or Electric Type the Heat Pump Changeover Valve type Stage Heat the 2nd Stage Heat operation Heat HP the Auxiliary Heat operation Typically the Aux Heat will be heat strips in a Heat system Stage Cool the 2nd Stage Cool operation Settings The Delta T Setting is the delta or difference between the setpoint and temp for determining when a heat or cool call comes on The is the number degrees away from setpoint Delta the minimum separation between heating and cooling setpoints Attempts to lower cooling below the heating setpoint by this amount will PUSH the heating setpoint down maintain this separation Same for setting the heating setpoint above the cooling it will PUSH the cooling setpoint up to maintain this separation Gas Elec or Heat pump w Cool or w Heat 3 15 degrees Gas or Elec Gas Elec 3F 1C w Cool Y or N Y or N Y or N Gas N N Y 3 140 02034 03 2 0 3 0 1 0 Delta Stage 1 ON Range 1 to 8 degrees 1 the delta from setpoint that stage 1 heating starts Delta Stage 1 OFF Range 0 to 8 degrees 0 the delta from setpoint that stage 1 heating stops Stage 1 turns off at setpoint Delta Stage 1 Delta Stage 2 ON Range 1 to 8 degrees the delta from setpoint that stage 2 heating starts Delta Stage 2 OFF Range 0 to 8 degrees Delta Stage 3 ON Range 1 to 8 degrees the delta from setpoint that stage 3 heating starts Delta Stage 3 OFF Range 0 to 8 degrees the delta from setpoint that stage 2 heating stops Stage 2 turns off at setpoint Delta Stage 2 the delta from setpoint that stage 3 heating stops Stage 3 turns off at setpoint Delta Stage 3 Delta Stage 1 ON Range 1 to 8 degrees the delta from setpoint that stage 1 cooling starts Delta Stage 1 OFF Range 0 to 8 degrees the delta from setpoint that stage 1 Cooling stops Stage 1 turns off at Delta Stage 1 Delta Stage 2 ON Range 1 to 8 degrees 2 the delta from setpoint that stage 2 cooling starts Delta Stage 2 OFF Range 0 to 8 degrees 0 the delta from setpoint that stage 2 Cooling stops Stage 2 turns off at Delta Stage 2 40F to 109F 4C 43C Default 90F 32C 44F to 113F 6C 45C Default 60F 15C Heat SP the maximum heating setpoint value Will not ramp or accept setpoints higher that maximum Cool SP the minimum cooling setpoint value Will not ramp or accept setpoints lower than this Run Time MRT Range 1 9 Minutes the minimum run time before a heating cooling cycle can turn off heating cooling cycle time Prevents rapid cycling Off Time MOT Range 5 9 Minutes the minimum off time before another heating cooling cycle can begin Provides short cycle protection Response the temperature sensor sensitivity Sets how fast the sensor responds to change Cycler fan cycler function cycles the HVAC system fan for an ON period followed by an Off continuously Used to provide minimum air ventilation requirements When the Fan 1 6 2 3 5 140 02034 03 4 time is set to a value greater than 0 an additional FAN mode is present when the FAN button ON Time OFF Time 0 120 minutes 10 120 minutes 0 OFF 10 Defaults all settings to factory defaults Status Settings Summary Yes No No Yes to restore defaults No to exit and not restor