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Honeywell T841A Installation Instructions Manual

Honeywell heating-cooling heat pump thermostat installation instructions.

 
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.
LED
OS Number
Indication
T841A1308
EM. HEAT
AUX. HEAT
T841A1316
b
T841A1423
EM. HEAT,
AUX. HEAT,
d
CHECK
b,c
T841A1464
T841A1498
EM. HEAT
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
EM. HEAT HEAT OFF COOL
CHECK
SYSTEM SWITCH
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
Table 1. T841A TRADELINE® Specifications.
Changeover
Anticipation
a
,
Manual Cool
Stage 2 fixed,
or Heat
0 to 1.5A
Stage 2
adjustable, 0.1
to 1.2A
Stage 2 fixed,
0 to 1.5A
80
80
70
70
60
60
50
50
FAN
AUTO
ON
EM. HEAT AUX. HEAT
FAN SWITCH
Fig. 1. External view of T841A.
• All Rights Reserved
T841A Heating-Cooling
Heat Pump Thermostat
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.
Heat
Terminal
Designations
G, R, W
, E,
2
L, B, X, Y, O
G, R, E, L, X
W
, B, W1,
2
Y
, O
1
W
, G, R, W
,
3
2
E, L, B, X, Y,
O
G, R, W, H, B,
X, O, Y
COVER
THERMOMETER
SET POINT
SCALE
LED (UP
TO THREE)
MOUNTING
HOLES (4)
X-XX UL
INSTALLATION INSTRUCTIONS
System
Remarks
Switch
Use when E
EM. HEAT,
and W
are
HEAT, OFF,
2
jumpered.
COOL
Does not
replace
T841A1068.
Not for systems
with E to W
2
jumper
Exact
replacement for
York model no.
2TH11703324
BACK OF DEVICE
WIRING TERMINAL
(UP TO 12)
Auto Fan
in EM.
HEAT
No
Yes
M2960A
69-0452-8

Summary of Contents

  • 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

    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.

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