Honeywell T841A,B Easy-To-SeeTM Heat Pump Thermostat Instruction Manual

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T841A,B Easy-To-See™  

Heat Pump Thermostat  

TRADELINE®  

INSTALLATION INSTRUCTIONS  

APPLICATION  

MERCURY NOTICE  

The T841A, B Easy-to-See™ Heat Pump Thermostat  

provides 24 Vac control of 2-stage heating and 1-stage  

cooling in heat pump systems, using manual change-  

over.  

This control contains mercury in a sealed tube.  

Do not place the control in the trash at the end of  

its useful life. If this control is replacing a control  

that contains mercury in a sealed tube, do not  

place your old control in the trash.  

The T841A Thermostat provides EM. HT.-HEAT-OFF-  

COOL System switching and AUTO-ON Fan switching.  

The T841B Thermostat provides HEAT-OFF-COOL  

System switching and AUTO-ON Fan switching.  

Contract your local waste management authority  

for instructions regarding recycling and the  

proper disposal of this control, or of an old control  

containing mercury in a sealed tube.  

The side of the thermostat features raised numbers for  

easy temperature setting by touch or sight. An audible  

click is heard with indents every two degrees as the  

temperature setpoint lever is moved. The thermostat  

wallplate features raised letters to aid in setting System  

switch and Fan switch settings. See Fig. 1.  

INSTALLATION  

When Installing this Product...  

1. Read these instructions carefully. Failure to follow  

them could damage the product or cause a hazard-  

ous condition.  

The T841A,B includes a thermostat and wallplate.  

Test holes are provided on the front of the thermostat to  

accommodate test meter probes without removing the  

thermostat from the wall. Remove the cover of the  

thermostat to expose the test holes that are labeled to  

correspond with the terminals on the thermostat back.  

2. Check the ratings given in the instructions and on  

the product to make sure the product is suitable for  

your application.  

3. Installer must be a trained, experienced technician.  

4. After installation is complete, check out product  

operation as provided in these instructions.  

OPERATION  

CAUTION  

Can cause Disconnect electrical shock or  

equipment damage.  

The stages of heat make sequentially as the temperature  

drops. Make refers to the mercury switch initiating a call  

for heat or cool.  

Electrical Hazard.  

Disconnect power before beginning installation.  

There is about 1°F (0.6°C) between stages so the  

second stage (auxiliary heat) makes only when the first  

stage cannot handle the load. This °F is the interstage  

differential.  

IMPORTANT  

— To prevent interference with the thermostat link-  

age, keep wire length to a minimum and run  

wires as close as possible to the thermostat  

base.  

— Do not short across coil terminals on the relay.  

This can burn out thermostat heat anticipator.  

— Never install more than one wire per terminal  

unless a factory-supplied jumper with a spade  

terminal is used.  

For T841A Thermostat only (not for T841B Thermostat):  

light emitting diode (LED) indicators light when  

something specific happens within the system:  

When AUX. HT. green or amber LED lights, auxiliary  

heat (second stage heat) is operating because the  

weather is so cold, the heat pump alone cannot  

handle the load.  

When red EM. HT. LED lights, emergency heat is  

operating (electric strip heaters), because home-  

owner physically switched to EM. HT. position. See  

heating/cooling manufacturer instructions.  

® U.S. Registered Trademark  

Copyright © 2003 Honeywell International Inc. ꢀ  

ꢀ All Rights Reserved  

69-1043-2  

https://manual-hub.com/  

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General	Details
Name	Honeywell T841A,B Easy-To-SeeTM Heat Pump Thermostat Instruction Manual
Make	Honeywell
Language	English
Filetype	PDF (Download)
File size	0.25 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Honeywell

Honeywell T841A,B Easy-To-SeeTM Heat Pump Thermostat Instruction Manual Overview

Summary of Contents

• Page 1: T841A,B Easy-To-See™ Heat Pump Thermostat provides 24 Vac control of 2-stage heating and 1-stage cooling in heat pump systems, using manual change-over. This control contains mercury in a sealed tube. Do not place the control in the trash at the end of its useful life. The T841A Thermostat provides EM. H T . -HEAT-OFF- COOL System switching and AUTO-ON Fan switching. The T841B Thermostat provides HEAT-OFF-COOL System switching and AUTO-ON Fan switching. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced technician. Disconnect power before beginning installation. To prevent interference with the thermostat linkage, keep wire length to a minimum and run wires as close as possible to the thermostat base. For T841A Thermostat only, light emitting diode (LED) indicators light when something specific happens within the system.
• Page 2: Heat pump thermostat Locate the thermostat between 4 ft (1.2m) and 5 ft (1.5m) above the floor in an area with good air circulation at average room temperature. All wiring must comply with local codes and ordinances. Do not install thermostat where it can be affected by drafts, hot or cold air from ducts, radiant heat, concealed pipes, or unheated areas. This thermostat is a precision instrument and was carefully adjusted at the factory. Handle it carefully. An incorrectly leveled thermostat causes inaccurate temperature control. Choose the mounting method that best fits your installation. Check the existing thermostat wires for cracked or frayed insulation. Use two of the four screws provided to loosely secure the thermostat. Exactly level the thermostat using a spirit level or plumb line. Replace the thermostat cover after installation.
• Page 3: HEAT PUMP THERMOSTAT CHANGEOVER RELAY (COOL) FAN SWITCH AUTO SYSTEM MONITOR EM. HT. LED (RED) EM. HT. RELAY AUX. HT. LED (GREEN) SYSTEM SWITCH COMPRESSOR CONTACTOR PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
• Page 4: Heat pump thermostat settings include temperature setting and system switch settings. The enlarged numbers on the thermostat assist in easy temperature setting. Heating should start when the system switch is set to HEAT and the temperature setpoint is adjusted above room temperature. A minimum-off timer can prevent compressor short cycling. System switch settings include EM. HT, HEAT, OFF, and COOL for different thermostat models. Operating cooling equipment in cold weather can damage the compressor. Cooling should start when the system switch is set to COOL and the temperature setpoint is adjusted below room temperature. Fan switch settings include AUTO and ON, controlling fan operation in response to the thermostat. In AUTO mode, the fan operates in response to heating and cooling demands. In ON mode, the fan runs continuously.