IM 1016-2 • MTB 158 MICROPROCESSOR THERMOSTAT
2
www.DaikinApplied.com
Figure 1:
Wiring Diagram for 3-Wire Valve Configuration
Figure 2:
Wiring Diagram for ON/OFF Ouput Configuration
Table 1:
Ratings
Voltage
Rating
Fan and system switches
Thermostatic
Switching
(Pilot Duty)
Inductive
Resistive
Amps
Pilot Duty
FLA
LRA
24 VAC
N.A.
N.A.
N.A.
24 VA
10 VA
120 VAC
5.8
34.8
6.0
125 VA
NA
240 VAC
2.9
17.4
5.0
125 VA
NA
277 VAC
2.4
14.4
4.2
125 VA
NA
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
3-Wire
Floating
OFF
with Demand
ON
with Demand
Main 1
(Terminal 10)
Powers main
valve open
ON at temp
demand
ON at temp
demand
Main 2
(Terminal 12)
Powers main
valve closed
Cycles ON with
demand
Cycles ON with
demand
Secondary
(Terminal 11)
Powers secondary
valve open
Summer: OFF
with heat demand
Winter: Disabled
Summer: ON with
heat demand
Winter: Disabled
Secondary 2
(Terminal 13)
Powers secondary
valve closed
ON at second
stage heating
demand
ON at second
stage heating
demand
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
AUTO. A 3°F dead-band is provided to prevent short cycling
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.
LO
W
VO
LT
AG
E
CO
NNE
CT
IO
NS
LI
NE
VO
LT
AG
E
C
ON
N
E
CT
IO
NS
L1 (HOT)
LO
MED
24 VAC 1
24 VAC 2
SETBACK INPUT
MAIN 1 OPEN
SEC 1 OPEN
MAIN 2 CLOSE
SEC 2 CLOSE
REMOTE PROBE
PIPE SENSOR
FAN
L2 OR NEUTRAL
24 VAC
XFMR
MAIN
SECONDARY
OUTSIDE AIR
DAMPER OUTPUT
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
HIGH
OR SINGLE SPEED FAN
LO
W
VO
LT
AG
E
CO
N
NE
C
T
ION
S
LI
NE
VO
LT
AG
E
CO
NN
EC
TI
ON
S
FAN
L2 OR NEUTRAL
REMOTE PROBE
PIPE SENSOR
L1 (HOT)
LO
MED
HIGH
OR SINGLE SPEED FAN
24 VAC 1
24 VAC 2
SETBACK INPUT
FAN
24 VAC
XFMR
MAIN 1
SEC 1
HEAT 2
MAIN 1
OUTPUT
SECONDARY
1 OUTPUT
DEMAND
OUTPUT
2ND STAGE
HEAT
OUTSIDE AIR
DAMPER OUTPUT
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
