Honeywell T841A, T841A1498, T841A1423, T841A1464, T841A1308 User Manual

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MOUNTING

HOLES (4)

WIRING TERMINAL

(UP TO 12)

M2960A

BACK OF DEVICE

EM. HEAT HEAT OFF COOL

AUTO ON

FAN

EM. HEAT AUX. HEAT

CHECK

FRONT OF DEVICE

FAN SWITCH

SYSTEM SWITCH

COVER

THERMOMETER

SET POINT

SCALE

LED (UP

TO THREE)

T841A Heating-Cooling

Heat Pump Thermostat

X-XX UL

INSTALLATION INSTRUCTIONS

®U.S. Registered Trademark

APPLICATION

The T841A Heating-Cooling TRADELINE® Thermostat

provides 24 Vac control of two-stage heating and one-

stage cooling in heat pump systems, using manual

changeover. This thermostat provides SYSTEM switch

selections of EM. HEAT-HEAT-OFF-COOL and FAN

switch selections of AUTO-ON. See Fig. 1. See Table 1 for

T841A TRADELINE® specifications.

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, which are labeled to

correspond with the terminals on the back of the

thermostat.

Table 1. T841A TRADELINE® Specifications.

Fig. 1. External view of T841A.

EM. HEAT LED also indicates compressor malfunction.

Premier White® color.

Sold only in Australia: degrees C.

CHECK LED indicates compressor malfunction.

OS Number

LED

Indication Changeover

Heat

Anticipation

Terminal

Designations Remarks

System

Switch

Auto Fan

in EM.

HEAT

T841A1308 EM. HEAT

AUX. HEAT

Manual Cool

or Heat

Stage 2 fixed,

0 to 1.5A

G, R, W

, E,

L, B, X, Y, O

Use when E

and W

are

jumpered.

EM. HEAT,

HEAT, OFF,

COOL

T841A1316 G, R, E, L, X

, B, W1,

, O

Does not

replace

T841A1068.

Yes

T841A1423

EM. HEAT,

AUX. HEAT,

CHECK

Stage 2

adjustable, 0.1

to 1.2A

, G, R, W

E, L, B, X, Y,

Not for systems

with E to W

jumper

T841A1464

b,c

T841A1498 EM. HEAT Stage 2 fixed,

0 to 1.5A

G, R, W, H, B,

X, O, Y

Exact

replacement for

York model no.

2TH11703324

T841A1506

69-0452-8

69-0452—8

T841A HEATING-COOLING HEAT PUMP THERMOSTAT

OPERATION

The stages of heat

make

sequentially as the temperature

drops.

Make

refers to the mercury switch initiating a call for

heat or cool.

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 1°F is the

interstage differen-

tial

The LED indicators on certain thermostat models light up

when something specific happens within the system.

When the green or amber LED lights, the auxiliary heat

(second stage heat) is operating because the weather is

so cold, the heat pump alone cannot handle the load.

When the red EM. HEAT LED lights, the emergency heat

is operating (usually electric strip heaters), because the

homeowner has physically switched to the EM. HEAT

position. See heating/cooling manufacturer instructions for

specific meaning.

RECYCLING NOTICE

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.

Contact your local waste management authority for

instructions regarding recycling and the proper

disposal of this control, or any control containing

mercury in a sealed tube.

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazard-

ous condition.

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.

CAUTION

1. Disconnect power supply to prevent electrical

shock or equipment damage.

2. To prevent interference with the thermostat

linkage, keep wire length to a minimum and

run wires as close as possible to the thermo-

stat base.

3. Do not overtighten the thermostat captive

mounting screws, because damage to the

threads can result.

4. Do not short across coil terminals on the relay.

This can burn out the thermostat heat

anticipator.

5. Never install more than one wire per terminal

unless a factory-supplied jumper with spade

terminal is used.

Location

Locate the thermostat about 5 ft (1.5m) above the floor in

an area with good air circulation at average room tempera-

ture.

Do not mount the thermostat where it can be affected by:

— drafts, or dead spots behind doors and in corners.

— hot or cold air from ducts.

— radiant heat from sun, appliances or fireplaces.

— concealed pipes and chimneys.

— unheated (uncooled) areas such as an outside wall

behind the thermostat.

This thermostat is a precision instrument and was carefully

adjusted at the factory.

Handle it carefully.

Mounting and Wiring

CAUTION

Disconnect power supply before beginning

installation. Can cause electrical shock or

equipment damage.

The T841A can be mounted directly to a wall or

horizontal outlet box. Choose the method that best fits

your installation.

In replacement applications, check the existing thermostat

wires for cracked or frayed insulation. Replace wires in

poor condition.

All wiring must comply with local codes and ordinances.

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