Honeywell T874 User Manuals

Table of Contents

• Application

  1
• Features

  1
• Specifications

  2
  • Super Tradeline®/Tradeline® Models

    2
• Installation

  7
  • When Installing this Product…

    7
  • Location

    7
  • Mount Subbase

    7
  • Wire Subbase

    8
  • Outdoor Disconnect

    10
  • Install and Adjust Stop Brackets

    10
  • Mount Thermostat

    11
• Settings

  11
  • Set the Heat Anticipator

    11
  • Temperature Setting

    12
  • Subbase Setting

    12
  • Setting the Adjustable Differential

    12
  • Verify the Adjustment

    13
• Checkout

  13
  • Heating

    13
  • Cooling

    13
  • Fan

    14
  • Outdoor Reset Thermistor (Where Applicable)

    14
• Calibration

  14
  • Thermostat

    14
  • Thermometer

    14
• Understanding Circuits

  14
  • Tracing Method:

    15
• Operation

  21
  • Heat Anticipation/Cool Anticipation

    21
  • Interstage Differential

    21
  • Droop

    21
  • Outdoor Reset

    21
  • Service and Replacement of C815A Outdoor Thermistor

    22
  • Features

    22
  • Led Indicators

    22
  • Restricted Setpoint (DoD)

    22
  • Applications

    22
  • Changeover on Standard Residential Systems

    22
  • Commercial Rooftop Application

    23
  • Heat Pump Application

    23
  • Space Temperature Sensing Low Voltage Controls

    23
  • Two-Stage Thermostat

    23
  • Cycling Rate

    24
  • Voltage Anticipation

    24
  • Outdoor Reset

    24
  • Outdoor Reset—How it Works

    24
  • Changeover

    24
  • Low Temperature Lockouts

    25
  • Heat Pumps with Dual Compressors

    25
  • Two speed Heat Pump

    25
  • Defrost Control

    26
  • Defrosting

    26
  • Auxiliary Heat

    26
  • Two-Stage Thermostat

    26
  • Stage or Time Modulated Control

    27
  • Three-Stage Thermostat

    27
  • Emergency Heat

    27
  • Switching to Emergency Heat

    27
  • Crankcase Heat

    28
  • Compressor Fault Relay

    28
• Cross Reference

  29
• Wiring Diagrams

  96