Honeywell T841A1308 User's Manual

Honeywell Thermostats User's Manual - T841A1308.
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MOUNTING
HOLES (4)

WIRING TERMINAL
(UP TO 12)

M2960A

BACK OF DEVICE

80

70

60

50

EM. HEAT   HEAT   OFF   COOL    

80
70
60
50

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
Copyright © 1997 Honeywell Inc.  •            •   All Rights Reserved

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.

a

EM. HEAT LED also indicates compressor malfunction.

b

Premier White® color.

c

Sold only in Australia: degrees C.

d

CHECK LED indicates compressor malfunction.

OS Number

LED

Indication

Changeover

Heat

Anticipation

Terminal

Designations

Remarks

System

Switch

Auto Fan

in EM.

HEAT

T841A1308

EM. HEATa,
AUX. HEAT

Manual Cool
or Heat

Stage 2 fixed,
0 to 1.5A

G, R, W2, E,
L, B, X, Y, O

Use when E
and W2 are
jumpered.

EM. HEAT,
HEAT, OFF,
COOL

No

T841A1316

G, R, E, L, X
W2, B, W1,
Y1, O

Does not
replace
T841A1068.

Yes

T841A1423b

EM. HEAT,
AUX. HEAT,
CHECKd

Stage 2
adjustable, 0.1
to 1.2A

W3, G, R, W2,
E, L, B, X, Y,
O

Not for systems
with E to W2
jumper

T841A1464b,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

T841A1506b

69-0452-8

0.519034s