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Honeywell T8411R Manual

Electronic heat pump thermostat
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Table of Contents

APPLICATION

The T8411R Thermostat provides 24V control of a two-stage
heating and one-stage cooling heat pump system with manual
changeover from heat to cool and second stage auxiliary heat.
First stage heating and cooling cycle rates are fixed at 3 cph.
Second-stage heating cycle rate is selectable at 3, 6, or 9 cph.
Temperature indication can be set for °F or °C.
® U.S. Registered Trademark
Copyright © 2000 Honeywell • All Rights Reserved
T8411R Electronic
Heat Pump Thermostat

FEATURES

• Attractive styling complements any decor to the
homeowner's delight.
• Ease-of-use means fewer homeowner questions and
increased homeowner satisfaction.
• Large display for quick easy readability.
• Conveniently sized 5-1/2 in. x 3-1/2 in. thermostat
makes it easy to install in a variety of locations.
• Keys are located by the display for easy access.
• Fan and system switches are located on the lower
edge to eliminate accidental setting changes.
• Easy installation, setup and self-test saves installer
time and increases their productivity.
• Manual changeover from heat to cool eliminates
unexpected system operation.
• °F or °C temperature display for added model
flexibility.
• Selectable second-stage heating cycle rate (3, 6 or 9
cph). First-stage heating cycle rate is fixed at 3 cph.
• Cooling cycle rate is fixed (3 cph), the standard setting
for compressors, for speedy installation.
• Setpoints are permanently held in memory (no
batteries used) and retained during power outages for
increased installer and homeowner convenience.
• Em Ht and Aux Ht indicators let the homeowner know
when these modes are active.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Settings and Adjustments .................................................
Operation ..........................................................................
Checkout ..........................................................................
Troubleshooting ................................................................
PRODUCT DATA
Contents
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68- 0185- 2

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Summary of Contents for Honeywell T8411R

  • Page 1: Table Of Contents

    • °F or °C temperature display for added model flexibility. The T8411R Thermostat provides 24V control of a two-stage heating and one-stage cooling heat pump system with manual • Selectable second-stage heating cycle rate (3, 6 or 9 changeover from heat to cool and second stage auxiliary heat.

  • Page 2: Specifications

    T8411R TRADELINE® model includes a thermostat, wallplate (for wiring and mounting thermostat) and owner’s guide. WALLPLATE 4-3/8 (111) Power: T8411R: 24 Vac nominal, 18 to 30 Vac, 50/60 Hz. 3-5/16 (84) Electrical Ratings: First Stage Heating: 0.02 to 1.5A run; 7.5A inrush.

  • Page 3: Installation

    Level for appearance only. The thermostat functions Disconnect power at furnace or main breaker/fuse normally even when not mounted level. box. Mount wallplate, T8411R and the screws provided (see Fig. 3) as follows: 1. Position the wallplate at the desired location on the wall. MERCURY NOTICE 2.
  • Page 4 T8411R ELECTRONIC HEAT PUMP THERMOSTAT NOTE: Restrict all wiring to the shaded area between the terminals. See Fig. 5. WALL WALL Refer to Fig. 6 for typical wiring hookup. A letter code is ANCHORS (2) located near each terminal for identification.
  • Page 5 REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y). M11333A NOT ALL MODELS HAVE BOTH O AND B TERMINALS. Fig. 6. T8411R two-stage heat, one-stage cool wiring diagram with manual changeover. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON MOUNTING PLATE.

  • Page 6: Settings And Adjustments

    T8411R ELECTRONIC HEAT PUMP THERMOSTAT SETTINGS AND ADJUSTMENTS Em Ht and Aux Ht Indications indicator points to either Emergency Heat (Em Ht) or Setting Fan and System Switches Auxiliary Heat (Aux Ht) when these modes are active. Em Ht: The...

  • Page 7: Operation

    Thermal Performance M18433 To turn heat off, press the key a fourth time. During severe weather, the T8411R actually controls closer to the setpoint than a conventional control. This is because the heat anticipator is replaced by two electronic control M18434 System setting at Cool: strategies—...

  • Page 8: Checkout

    Minimum Off-Timing display. The B terminal is powered continuously while system A minimum off-timer in the T8411R assures that the compressor does switch is in Heat. not come on again for at least five minutes after it turns off. The minimum-off timer is triggered when the compressor turns off.

  • Page 9: Troubleshooting

    T8411R ELECTRONIC HEAT PUMP THERMOSTAT TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE ACTION HEATING OR COOLING EQUIPMENT • CHECK THAT C TERMINAL IS CONNECTED TO NO AC POWER TO THERMOSTAT. WON'T OPERATE. THE SYSTEM TRANSFORMER. • CHECK POWER TO HEATING AND COOLING EQUIPMENT –...
  • Page 10 68-0185—2...
  • Page 11 68-0185—2...
  • Page 12 Home and Building Control Home and Building Control Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled 68-0185—2 J.H. Rev. 10-00 www.honeywell.com/yourhome paper containing at least 10%...

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