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Figure 1: Wiring Diagram for 3-Wire Valve Configuration
L1 (HOT)
1
LO
2
MED
3
HIGH
4
OR SINGLE SPEED FAN
24 VAC 1
5
24 VAC 2
6
SETBACK INPUT
7
MAIN 1 OPEN
10
SEC 1 OPEN
11
MAIN 2 CLOSE
12
SEC 2 CLOSE
13
14
15
16
17
Figure 2: Wiring Diagram for ON/OFF Ouput Configuration
L1 (HOT)
1
LO
2
MED
3
HIGH
4
OR SINGLE SPEED FAN
24 VAC 1
5
24 VAC 2
6
SETBACK INPUT
7
MAIN 1
10
SEC 1
SECONDARY
11
1 OUTPUT
FAN
12
HEAT 2
2ND STAGE
13
HEAT
14
15
16
17
IM 1016-2 • MTB 158 MICROPROCESSOR THERMOSTAT
L2 OR NEUTRAL
FAN
24 VAC
XFMR
MAIN
SECONDARY
OUTSIDE AIR
DAMPER OUTPUT
REMOTE PROBE
PIPE SENSOR
L2 OR NEUTRAL
FAN
MAIN 1
OUTPUT
DEMAND
OUTPUT
OUTSIDE AIR
DAMPER OUTPUT
REMOTE PROBE
PIPE SENSOR
Table 1: Ratings
Fan and system switches
Voltage
Inductive
Rating
FLA
24 VAC
N.A.
120 VAC
5.8
240 VAC
2.9
277 VAC
2.4
Thermostat Operation
These thermostats are designed to control ON-OFF, N.O.
and N.C. valves, relays and three-wire floating valves. These
units may include a fan switch with one or more fan speed
selections.
Table 2: Main and Secondary Output Operation*
Output
Main 1
(Terminal 10)
Main 2
(Terminal 12)
Secondary
Powers secondary
(Terminal 11)
Secondary 2
Powers secondary
(Terminal 13)
Note: * Operation determined by configuration. See Dip Switch Configuration
Table.
Mode Button Operation
OFF: All thermostat outputs are off, fan is still operational if
connected to manual fan speed switch.
AUTO: The thermostat automatically selects heating or cooling
mode depending on the set point and room temperature. The
appropriate HEAT or COOL indicator is enabled in addition to
24 VAC
AUTO. A 3°F dead-band is provided to prevent short cycling
XFMR
between heating and cooling modes.
After change-over the control points automatically shift so that
the heating OFF-point 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.
If constructed without a mode button, the thermostat operates
in Auto mode, subject to configuration of the 2/4 pipe jumper
and pipe sensor input.
2
Resistive
Pilot Duty
Amps
LRA
N.A.
N.A.
24 VA
34.8
6.0
125 VA
17.4
5.0
125 VA
14.4
4.2
125 VA
3-Wire
OFF
Floating
with Demand
Powers main
ON at temp
valve open
demand
Powers main
Cycles ON with
valve closed
demand
Summer: OFF
with heat demand
valve open
Winter: Disabled
ON at second
stage heating
valve closed
demand
www.DaikinApplied.com
Thermostatic
Switching
(Pilot Duty)
10 VA
NA
NA
NA
ON
with Demand
ON at temp
demand
Cycles ON with
demand
Summer: ON with
heat demand
Winter: Disabled
ON at second
stage heating
demand
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