Daikin MT 168 Manual

Installation and Maintenance Manual IM 1017-1
Group: Applied Air Systems
Part Number: 910102992
Date: January 2017
MT 168 0-10 VDC/4-20mA Thermostat
Installation
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
wire-nut 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 dip switches and jumpers. You may need to
recongure the thermostat for your application.
1. Install the thermostat with the two furnished mounting
screws to a standard 4-1/16" × 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 screws provided. Tighten the
screws evenly but do not overtighten. Connect wires
per wiring diagram.
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 thermostat.
5. Connecting a jumper between terminals 16 and 17
will disable the secondary output and change the
main output to heat mode.
6. Connection of a 24 VAC set-back signal will force
the control into unoccupied mode (see diagram).
Pressing an arrow key or the mode buttons on the
thermostat cover will disable the setback input for
one hour.
7. Remove the LCD plastic protective lm to complete
the installation. Reinstall the cover assembly. Install
cover locking screw provided.
8. 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 1017-1 • MT 168 0-10 VDC/4-20mA THERMOSTAT 2 www.DaikinApplied.com
Figure 1: Mounting
Figure 2: Typical Wiring*
NOTE: Note: * Specic models may have fewer connections.
Electrical Ratings
Table 1: Fan switch (terminals 1-4) line voltage
connections
Voltage
Rating
Inductive Resistive
Amps
Pilot
Duty
Thermostatic
Switching
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
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 congured for staged
heat.
7. The thermostat is shipped with all dip switches in the
“ON” (closed) position.
8. The damper output is ON when mode is AUTO, HEAT or
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.
LOW VOLTAGE
CONNEC T IONS
LINE VOLTAGE
CONNECTIONS
FANL2 OR NEUTRAL
OPTIONAL REMOTE PROBE
OPTIONAL PIPE SENSOR
L1 (HOT)
LO FAN
MED FAN
HIGH FAN
OR SINGLE SPEED
24 VAC 1
24 VAC 2
SETBACK
24
VAC
XFMR
MAIN 1
0-10 VDC
OUTPUT
SECONDARY
0-10 VDC
1 OUTPUT FAN
OUTPUT
AUXILIARY
HEAT
OUTPUT DAMPER
OUTPUT
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7

IM 1017-1 (01/17) ©2017 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 the OFF position, all
outputs are off and the display is blank.
Up/Down Arrow Operation
A rst touch of either arrow will display the setpoint (a single
set point is employed for both heating and cooling). Continued
pressure on either arrow will scroll the setpoint to new values.
After three consecutive seconds on either arrow, the selected
setpoint becomes effective and the display of the room
temperature resumes.
Conguration
Table 2: Circuit Board Jumper Conguration
Jumper Closed ON* Open OFF
JP1 Local Sensing Remote Sensing
JP2 2 Pipe System 4 Pipe System
JP3 Factory Use Only
JP4 0-10 VOC
Main Output
4-20 mA
Main Output
JP5 0-10 VOC
Secondary Output
4-20 mA
Secondary Output
Table 3: Dip Switch Conguration
Switch Closed ON* Open OFF
1Not Use Not Used
2Staged Heat 3°F Diff.
(Term. 13)
Aux. Heat No Diff. (Term.
13)
3°F Display °C Display
4
Main & Sec. Outputs
0-10 VOC (Term. 10 &
11) requires JP4 & JP5
Main & Sec. Outputs
4-20 mA (Term. 10 & 11)
Remove JP4 & JP5
5Operating Position Not Used
6Setback= 90°F & 50°F Setback = 85°F & 60°F
Note: * On is with the dip switch handle to the right. See diagram.
Figure 3: Circuit Board
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 4: Service Functions
Item # Function Range Default
1Zone Temp Offset -5.1 °F to 5.1 °F °0 F
2Valve Stroke Time 30 sec. to 5 min. 120 sec.
3Fan Delay to OFF 2 to 10 min. 120 sec.
4
Compressor
Minimum OFF
Time
30 sec. to 10 min. 120 sec.
5 Purge Cycle
0 = time based
1 = temperature
based
1