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Figure 1: Mounting
Figure 2: Typical Wiring*
L1 (HOT)
1
LO FAN
2
MED FAN
3
HIGH FAN
4
OR SINGLE SPEED
24 VAC 1
5
24 VAC 2
6
SETBACK
7
10
SECONDARY
11
0-10 VDC
1 OUTPUT
12
AUXILIARY
13
HEAT
OUTPUT
14
15
OPTIONAL REMOTE PROBE
16
17
OPTIONAL PIPE SENSOR
NOTE: Note: * Specific models may have fewer connections.
Electrical Ratings
Table 1: Fan switch (terminals 1-4) line voltage
connections
Inductive
Voltage
Resistive
Rating
FLA
LRA
24 VAC
N.A.
N.A.
120 VAC
5.8
34.8
240 VAC
2.9
17.4
277 VAC
2.4
14.4
IM 1017-1 • MT 168 0-10 VDC/4-20mA THERMOSTAT
L2 OR NEUTRAL
FAN
MAIN 1
0-10 VDC
OUTPUT
FAN
OUTPUT
DAMPER
OUTPUT
Pilot
Thermostatic
Amps
Duty
Switching
N.A.
24 VA
10 VA
6.0
125 VA
NA
5.0
125 VA
NA
4.2
125 VA
NA
Application Notes
1. When no changeover pipe sensor is used, the main
output controls cooling and the secondary output controls
heating.
2. The fan output, terminal 12, is energized whenever there
is a demand for heating or cooling. This output can be
connected to a relay that can be used to provide fan
cycling to terminal 1.
3. The changeover pipe sensor should be mounted on the
main coil input for water system operation and in the
main duct system for forced air operation.
4. The set point and operating mode will be retained on a
loss of power.
5. When using either a remote probe or pipe sensor, run
wiring away from any electrical motors or power wiring.
6. The auxiliary heat output supplies a 24 VAC signal with
call for heat. This output is shipped configured for staged
heat.
7. The thermostat is shipped with all dip switches in the
"ON" (closed) position.
24 VAC
8. The damper output is ON when mode is AUTO, HEAT or
XFMR
COOL. Damper is OFF in set back.
Thermostat Operation
These thermostats are designed to control 0-10 VDC/4-0 mA
valves. These units may include a fan switch with one or more
fan speed selections.
Mode Button Operation
OFF: All thermostat outputs are off, fan is still operational if
connected to a manual fan switch.
AUTO: The thermostat automatically selects heating or cooling
mode depending upon the relationship of the setpoint and the
room temperature. The appropriate HEAT or COOL indicator
is enabled in addition to AUTO. A 3°F dead band is provided
to prevent short cycling between heating and cooling modes.
After changeover, the control points automatically shift so that
the heating OFF-point equals the set point temperature or the
cooling OFF-point equals the set point temperature.
COOL: The thermostat operates as a cooling only thermostat.
The heating outputs are disabled.
HEAT: The thermostat operates as a heating-only thermostat.
The cooling outputs are disabled.
2
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