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Honeywell T841A Installation Instructions Manual

Honeywell heating-cooling heat pump thermostat installation instructions.
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T841A Heating-Cooling
Heat Pump Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The T841A Heating-Cooling TRADELINE® Thermostat
Test holes are provided on the front of the thermostat to
provides 24 Vac control of two-stage heating and one-
accommodate test meter probes without removing the
stage cooling in heat pump systems, using manual
thermostat from the wall. Remove the cover of the
changeover. This thermostat provides SYSTEM switch
thermostat to expose the test holes, which are labeled to
selections of EM. HEAT-HEAT-OFF-COOL and FAN
correspond with the terminals on the back of the
switch selections of AUTO-ON. See Fig. 1. See Table 1 for
thermostat.
T841A TRADELINE® specifications.
Table 1. T841A TRADELINE® Specifications.
Auto Fan
LED
Heat
Terminal
System
in EM.
OS Number
Indication
Changeover
Anticipation
Designations
Remarks
Switch
HEAT
a
T841A1308
EM. HEAT
,
Manual Cool
Stage 2 fixed,
G, R, W
, E,
Use when E
EM. HEAT,
No
2
AUX. HEAT
or Heat
0 to 1.5A
L, B, X, Y, O
and W
are
HEAT, OFF,
2
jumpered.
COOL
T841A1316
G, R, E, L, X
Does not
Yes
W
, B, W1,
replace
2
Y
, O
T841A1068.
1
b
T841A1423
EM. HEAT,
Stage 2
W
, G, R, W
,
Not for systems
3
2
AUX. HEAT,
adjustable, 0.1
E, L, B, X, Y,
with E to W
2
d
CHECK
to 1.2A
O
jumper
b,c
T841A1464
T841A1498
EM. HEAT
Stage 2 fixed,
G, R, W, H, B,
Exact
0 to 1.5A
X, O, Y
replacement for
York model no.
2TH11703324
b
T841A1506
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.
FRONT OF DEVICE
BACK OF DEVICE
COVER
80
80
70
70
60
60
50
THERMOMETER
50
SET POINT
SCALE
EM. HEAT HEAT OFF COOL
FAN
AUTO
ON
CHECK
EM. HEAT AUX. HEAT
LED (UP
TO THREE)
FAN SWITCH
WIRING TERMINAL
MOUNTING
SYSTEM SWITCH
M2960A
(UP TO 12)
HOLES (4)
Fig. 1. External view of T841A.
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
• All Rights Reserved
X-XX UL
69-0452-8

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   Summary of Contents for Honeywell T841A

  • Page 1

    COVER THERMOMETER SET POINT SCALE AUTO EM. HEAT AUX. HEAT LED (UP TO THREE) FAN SWITCH Fig. 1. External view of T841A. • All Rights Reserved X-XX UL INSTALLATION INSTRUCTIONS System Remarks Switch , E, Use when E EM. HEAT,...

  • Page 2: Mounting And Wiring

    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.

  • Page 3

    Grasp the thermostat cover at the top and bottom with one hand. Pull outward on the bottom edge of the cover until it snaps free of the thermostat base. Carefully remove and save the packing material surrounding the mercury switches.

  • Page 4

    T841A HEATING-COOLING HEAT PUMP THERMOSTAT FALL H1 ANTICIPATOR C1 ANTICIPATOR FALL H2 ANTICIPATOR POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED. WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION.

  • Page 5

    Fig. 5. Internal schematic and typical wiring diagram for TRADELINE® T841A1423 and T841A1464 (sold only in Australia) with AUX. HEAT, EM. HEAT and CHECK LEDs. Provides heat or cool changeover relay control and Fig. 6. Second stage adjustable heat anticipator indicator. T841A HEATING-COOLING HEAT PUMP THERMOSTAT SWITCH AUTO AUX.

  • Page 6

    T841A HEATING-COOLING HEAT PUMP THERMOSTAT CHECKOUT Heating Move the SYSTEM switch on the thermostat to HEAT and the FAN switch to AUTO. Move the setpoint lever to about 10°F (6°C) above the room temperature. Heating should start and the fan should run. Move the setpoint lever about 10°F (6°C) below the room temperature.

This manual also for:

T841a1308, T841a1423, T841a1316, T841a1464, T841a1498, T841a1506

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