Daikin MTB 158 Manual

Installation and Maintenance Manual IM 1016-2
Group: Applied Air Systems
Part Number: 910231057
Date: July 2018
MTB 158 Microprocessor Thermostat
ON/OFF and 3-Wire Controller
DANGER
READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE
THIS THERMOSTAT.
Failure to observe safety information and comply with
instructions could result in PERSONAL INJURY, DEATH
AND/ OR PROPERTY DAMAGE.
To avoid electrical shock or damage to equipment,
disconnect power before installing or servicing. Use only
wiring with insulation rated for full thermostat operating
voltage. Use copper wire only. Insulate or wirenut all un-
used leads. Any wiring, including the remote probe,may
carry the full operating voltage of the thermostat.
To avoid potential re and/ or explosion do not use in
potentially ammable or explosive atmospheres.
Retain these instructions for future reference. You must
review your application and national and local codes to
ensure that your installation will be functional and safe.
CAUTION
Care should be used to avoid electrostatic discharge to
the microprocessor.
This unit has conguration jumpers. You may need to
recongure this thermostat for your application.
Installation
1. Install the thermostat with the two furnished mounting
screws to a standard 4-11/16" × 2-1/8" square device
box with a 2" × 4" adapter ring.
2. For wall installations, mount the thermostat on an
inside wall approximately 5 feet above the oor. The
location should provide circulation at average room
temperature. Avoid direct sunlight or sources of hot or
cold air in the room or wall.
3. Remove the cover. Mount thermostat base assembly
to the outlet box using the screws provided, tighten
the screws evenly but do not over tighten. Connect
wires as shown in the appropriate wiring diagram for
your thermostat style.
4. To use a remote sensor on units with local sensing
capability, remove jumper JP-1 to disable local
sensing. Failure to remove JP-1 will cause improper
operation of the thermostat.
5. Remove the LCD plastic protective lm. Reinstall
the cover assembly. Install the cover locking screw
provided in the hole at the left side of the control
enclosure to complete the installation.
6. Checkout: After wiring and installation are complete,
energize the system and check the operation. Adjust
the thermostat as necessary to complete at least one
cycle. Be sure the thermostat and all other equipment
are functioning correctly.

IM 1016-2 • MTB 158 MICROPROCESSOR THERMOSTAT 2 www.DaikinApplied.com
Figure 1: Wiring Diagram for 3-Wire Valve Conguration
Figure 2: Wiring Diagram for ON/OFF Ouput Conguration
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 oating 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 conguration. See Dip Switch Conguration
Table.
Mode Button Operation
OFF: All thermostat outputs are o󰀨, 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 conguration of the 2/4 pipe jumper
and pipe sensor input.
LOW VOLTAG E
CONNE CTIONS
LINE VOLTAG E
CONNE CTIONS
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
FANL2 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
LOW VOLTAG E
CONNE C T IONS
LINE VOLTAG E
CONNECTIONS
FANL2 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 VA
C
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

IM 1016-2 (07/18) ©2018 Daikin Applied | (800) 432–1342 | www.DaikinApplied.com
Fan Speed Switch Operation
Fan speed is determined by manual selection from fan switch
OFF to HIGH, MEDIUM and/ or LOW. In units with the Cycling
Fan Option (demand output), the Fan operation (CYCLING vs.
CONTINUOUS) is determined by application connections. In
OFF position all outputs are o󰀨 and display blank.
Up/ Down Arrow Operation
A rst touch of either arrow will display the set point (a single
set point is employed for both heating and cooling). Continued
pressure on either arrow will scroll the set point to new values.
After three seconds with no pressure on either arrow, the
selected set point becomes e󰀨ective and the display of the
room temperature resumes.
Setback Operation
Connection of the Setback Input to 24 VAC 1 will force the
control into unoccupied mode (see wiring diagram). Pressing
an arrow key or the mode button on the thermostat cover will
disable the setback input for one hour.
Pipe Sensor Operation
If cold water is detected, the system will operate in summer
mode and the Main output will be cooling. If hot water is
detected, the system will operate in winter mode, the Main
output will be heating and First Stage Secondary Output will be
disabled. In the case of an ambiguous reading, neither hot nor
cold, the thermostat will initiate a purge cycle.
Three Wire Floating Valve Operation
Open and Close outputs are used to position the valve.
Stroke time is factory set at two minutes. Outputs are o󰀨 after
reaching full on or o󰀨 position. Valves are periodically reset for
accuracy.
Outside Air Damper Operation
This output is ON any time the control is turned ON.
Application Notes
1. When no pipe sensor is used the main output controls
cooling and the secondary output controls heating.
2. The pipe sensor should be mounted on the main coil
input for water system operation and in the main duct
system for forced air operation.
3. The set point and operating mode will be retained on a
loss of power.
4. When using either a remote probe or pipe sensor, run
wiring away from any electrical motors or power wiring.
Service Menu
Access: Press UP▲ and DOWN▼ arrows for 5 seconds.
Menu Selection: Select 1 to 5 by pressing the mode button or
by pressing the UP▲ and DOWN▼ arrows simultaneously.
Adjust Value: Use UP▲ or DOWN▼ arrow.
Table 3: Service Menu Functions
Item # Function Range Default
1Zone Temp O󰀨set -5.1°F to 5.1°F 0°F
2Valve Stroke Time 30 sec. to 5 min. 120 sec.
3 Fan Delay to OFF 0 to 10 min. 0 sec.
4
Compressor
Minimum OFF
Time
30 sec. to 10 min. 120 Sec.
5Purge Cycle
0 = Time Based
1 = Temperature
Based
1
Figure 3: Circuit Board Jumpers
Figure 4: Dip Switch Conguration
Example: This dip switch is congured for ON with demand, ºF
display. ON-OFF operation and 90ºF/50ºF setback.
NOTE: Thermostat power must be cycled for changes in the
dip switch conguration to take e󰀨ect.
Table 4: Circuit Board Jumper Conguration
Jumper Designation Jumper Installed ON Jumper Removed
JP1 Local Sensing Remote Sensing
JP4 2 Pipe System* 4 Pipe System
Power-Up Operating Sequence
Upon application of power, an MTA158 will go directly to
normal operation.
AUTO JP4
JP1
123
456
DIP SWITCH
ON
1 2 3 45 6 7
10 11 12 13 15 16 17
1 2 3 4 5 6
ON
Secondary 1 ON with Demand
Main 1 ON with Demand
Fahrenheit Display
Secondary 3-Wire Floating
Main 3-Wire Floating
90°F/50°F Setback
Secondary 1 OFF with Demand
Main 1 OFF with Demand
Centigrade Display
Secondary 3 ON – OFF
Main 3 ON – OFF
85°F/60°F Setback