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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

1 2 3 4 5 6

Sommario

Pagina 1 - Heat Pump Thermostat

MOUNTINGHOLES (4)WIRING TERMINAL(UP TO 12)M2960ABACK OF DEVICE80706050EM. HEAT HEAT OFF COOL 80706050AUTO ONFANEM. HEAT AUX. HEAT CHECKFR

Pagina 2 - RECYCLING NOTICE

69-0452—82T841A HEATING-COOLING HEAT PUMP THERMOSTATOPERATIONThe stages of heat make sequentially as the temperaturedrops. Make refers to the mercury

Pagina 3 - SETTINGS

69-0452—83T841A HEATING-COOLING HEAT PUMP THERMOSTATODT 1EHR 1RTD 2RTD 1ODT 2RTD 3ERH 2RDGSYSTEMSWITCHEM. HEATHEATOFFCOOLH2FALLH1C1FALLH1 & C1ANTI

Pagina 4 - 69-0452—8

69-0452—84T841A HEATING-COOLING HEAT PUMP THERMOSTATFig. 3. Internal schematic and typical wiring diagram for SUPER TRADELINE® T841A1316 with AUX. HEA

Pagina 5 - EM.HEAT HEAT OFF COOL

69-0452—85T841A HEATING-COOLING HEAT PUMP THERMOSTATFig. 5. Internal schematic and typical wiring diagram for TRADELINE® T841A1423 and T841A1464 (sold

Pagina 6 - CHECKOUT

69-0452—86T841A HEATING-COOLING HEAT PUMP THERMOSTATCHECKOUTHeatingMove the SYSTEM switch on the thermostat to HEAT andthe FAN switch to AUTO. Move th

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