Daikin MT 168 Handbuch

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

VAC

XFMR

MAIN 1

0-10 VDC

OUTPUT

SECONDARY

0-10 VDC

1 OUTPUT FAN

OUTPUT

AUXILIARY

HEAT

OUTPUT DAMPER

OUTPUT

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

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.

Compressor

Minimum OFF

Time

30 sec. to 10 min. 120 sec.

5 Purge Cycle

0 = time based

1 = temperature

based

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