X-XX UL
INSTALLATION INSTRUCTIONS
®U.S. Registered Trademark
Copyright © 2002 Honeywell • • All Rights Reserved
T834C,T8034C Heating-Cooling
Triple Fuel Thermostats
APPLICATION
The T834C, T8034C Heating-Cooling Triple Fuel Thermo-
stats, see Fig. 1, control 24 to 30 Vac single-stage heating-
cooling systems. The adjustable heat anticipator setting
range of 0.15A to 1.2A and the two jumpers included make
the T834C and T8034C Thermostats applicable to almost
all single-stage heating applications. See Table 1 for
specific models and applications. An spdt mercury switch
makes R to W on a temperature fall for heating, and R to Y
on a temperature rise for cooling.
Table 1. Thermostat Models and Specifications.
Heat
Switching
Figure
Model Application Mounting
Anticipation
System Fan
Reference
T834C
For use in gas or oil-fired,
heat pump or central
vertically 0.15A to 1.2A HEAT-OFF-COOL AUTO-ON 3, 4
T8034C
electric heat systems.
a,b
horizontally
a
In electric heat applications without fan sequencers, jumper terminals 1 and 2 to control the fan from the thermostat
during heating.
b
Two jumpers included.
Fig. 1. Internal view of T834C and T8034C.
.18
.2
.2
5
.3
.5
.7
.9
L
O
N
G
E
R
M11340
L
O
N
G
E
R
FAN
SWITCH
TEMPERATURE
SETTING LEVER
MOUNTING HOLE
SYSTEM
SWITCH
ADJUSTABLE HEAT
ANTICIPATOR
INDICATOR
BIMETAL ELEMENT
BEHIND SCALE
MOUNTING HOLE
(THERMOSTAT
TO WALL OR
OUTLET BOX)
MERCURY BULB
MERCURY
BULB
MOUNTING HOLE
(THERMOSTAT
TO WALL OR
OUTLET BOX)
BIMETAL ELEMENT
BEHIND HEAT
ANTICIPATOR
SCALE
SYSTEM
SWITCH
MOUNTING
HOLE
TEMPERATURE
SETTING LEVER
FAN
SWITCH
ADJUSTABLE HEAT
ANTICIPATOR INDICATOR
.25
.3
.35
.5
.7
.9
.2
.18
T834C
T8034C
69-1628
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