Smart temp SMT-110 User Manual

Smart Temp Model SMT-110 Digital Thermostat

A. Installation, Mounting:

CAUTION:

1. Turn off SMT-110, all electronic source and electrical devices
(e.g. heater) which will be connected before installation and maintenance.

2. The installer must be a trained HVAC service technician.

1. Installation Location

The thermostat should be mounted on an inner wall 1.5m above the floor in a
position where it is readily affected by changes of general room temperature
with freely circulating air. Prevent direct exposure to sunlight. Do not place
this unit at a location where air circulation is low or where there is great
temperature changes (e.g. near door). Do not place the thermostat near any
heat generating sources (hot air vents, TV or lights).

2. Wiring

TheSMT-110 has 6 terminals at the back of the thermostat which are labeled

as “C”, “Y” and “G”, “RC”, “R” and “O/W B”.

Different wirings are for different Mode types.

“C” Terminal is optional for 24Vac Powered

Mode type 1 (HO) : Two wire Heat only

Mode type 2 (HF) : Three wire Heat only

Mode type 3 (CL) : Three wire Cool only

Mode type 4 (HP) : Four wire Single Stage Heat Pump:

Mode type 5 : Single Transformer Heat/Cool System

Mode type 5 : Two Transformer Heat/Cool System

3. Mounting:

1. Ensure that the surface is level.

2. Place the cables at the hole near the terminal block.

3. Insert 2 pcs of wall anchors into the holes of the wall.

4. Fasten the thermostat with 2 pcs of long screws through the 2 mounting
holes.

B. Start/Reset:

1. When the system is reset, all the LCD segments is ON and the

measured temperature will be displayed after a while.

2. Low Battery Check will be done at startup.

will be shown

battery is low

3. Output will be turned off at startup

C. Normal Display Mode:

1. Temperature detection starts and LCD displays the room temperature.

2. In Heat or Auto Mode, defrost function is activated with
displayed when temperature is below 5

°C/ 40F. Heater is on

regardless of the setting temperatures

3. Below 0

°C/ 32°F, SMT-110 will display LO.

4. Above 40

°C/ 99°F, SMT-110 will display HI.

5. Press <Up>/ <Down> to adjust Heat/ Cool setting temperature

6. Press <Mode> to select Heat/ Cool/ Auto/ Off Mode

7. Press <Fan> to select Fan On/ Auto

D. Temperature Setting Display Mode:

To adjust Heat/ Cool setting

1. Press <Up> or <Down> keys to adjust Heat/ Cool setting temperature in
Normal Display Mode.

2. Heat/ Cool setting temperature flashes.

3. In Heat Mode, only Heat setting temperature can be adjusted.

4. In Cool Mode, only Cool setting temperature can be adjusted.

5. In Auto Mode, Heat and Cool setting temperature can be adjusted

6. In Off Mode, no setting temperature can be adjusted.

7. Press <Mode> key to exchange the Heat and Cool setting temperature
in Auto Mode.

8. The operation will resume to Normal Display Mode if no key is pressed
for 10 sec.

E. Internal Mode Setting Display:

To adjust the internal setting of SMT-110:

Mode Type Selection

1. Press and hold <Mode> and <Up> keys for 2 sec.

2. LCD changes to the display of Mode type selection.

<Up> key

<Down> key

<Mode> key <Fan> key

Optional

3. The letters represent Mode type.

4. Press <Up>/ <Down> to adjust Mode type.

5. Press <ENT> to select Mode type and return to Normal Display Mode.

Function Setting Selection

1. Press and hold <Fan> and <Down> keys for 2 sec.

2. LCD changes to the display of Function setting selection.

3. The left letters represent Function type; the right letters represent Setting.

4. Press <Up>/ <Down> to adjust Function type/ Setting.

5. Press <NEXT> to select Function type/ Setting.

6. Press <ENT> to return to Normal Display Mode.
Description of the Mode types:

1. Heat only
Heat Only Mode can be used for normal-open or normal -close valves. Fan
cannot be selected.

2. Heat with fan
Heat Only Mode with Fan Selection.

3. Cool
Cool Only Mode with Fan Selection.

4. Heat Pump
Heat/ Cool/ Auto Mode can be selected with changeover valve (reversing
Valve).
(**While in Auto Mode, there is a Heat/Cool switching delay of 4 minutes for
switching a heating system to cooling system or vice versa. During the
period, neither Heater / Cooler nor Fan will turn on.)

5. Electric / gas heat with cool

Heat/ Cool/ Auto Mode can be selected. ( Default Setting)

Table of the Internal Setting:
Mode type Function type Setting

HO

Heat only

HS Span of Heater

1C / 2F
2C/ 4F

dU Temperature Display Unit

C
F

HF Heat with fan

HS Span of Heater

1C/ 2F
2C/ 4F

dU Temperature Display Unit

C
F

FC Fan Control Method

O

Gas Heater– equipment controls
fan

E

Electric furnace – thermostat
controls fan

CL Cool

dU Temperature Display Unit

C
F

CS Span of Cool

1C/ 2F
2C/ 4F

Cd

Compressor
Minimum-Off Delay

1 1 minute compressor off delay
2 2 minute compressor off delay
3 3 minute compressor off delay
4 4 minute compressor off delay
5 5 minute compressor off delay

HP Heat pump

HS Span of Heater

1C/ 2F
2C/ 4F

CO Changeover Valve

C

O/B terminal energized in cooling
(default)

H O/B terminal energized in heating

dU Temperature Display Unit

C
F

CS Span of Cool

1C/ 2F
2C/ 4F

Cd

Compressor/ Heater
Minimum-Off Delay

1 1 minute compressor off delay
2 2 minute compressor off delay
3 3 minute compressor off delay
4 4 minute compressor off delay
5 5 minute compressor off delay

SL Mode Adjustment

1 Heat, Cool, Off Selectable
2 Auto, Off Selectable
3 Heat, Cool, Off, Auto Selec table

HC

Electrical /gas
heat with cool
(Default
setting)

HS Span of Heater

1C/ 2F (Default setting)
2C/ 4F

dU Temperature Display Unit

C (Default setting)
F

CS Span of Cool

1C/ 2F (Default setting)
2C/ 4F

Cd

Compressor Minimum-Off
Delay

1 1 minute compressor off delay
2 2 minute compressor off delay
3 3 minute compressor off delay

4

4 minute compressor off delay
(Default setting)

5 5 minute compressor off delay

SL Mode Adjustment

1 Heat, Cool, Off Selectable
2 Auto, Off, Selectable

3

Heat, Cool, Off, Auto Selectable
(Default setting)

FC Fan Control Method

O

Gas furnace – equipment controls
fan

E

Electric furnace – thermostat
controls fan
(Default setting)

F. Replaceable Batteries Instruction

Batteries shall be installed with proper polarity and
correct battery type.

Do not use old and new batteries simultaneously.
Batteries shall be removed if consumed or if product is

to be left unused for a long time. Use 1.5V/ cell ALKALINE
batteries 2 pieces.

G. Specification:

1. Temperature Measurement: 0C~40C/ 32F~99F

2. Accuracy: ±0.5C/ 1°F

3. Temperature Controllable Range:
Heat/ cool Mode:
Heat/Cool Setting: 5C~35C/ 40F~95F
Auto Mode:
Heat Setting: 5C~30C/ 40F~85F
Cool Setting: 10C~35C/ 50F~95F

4. Resolution: 0.5C/1°F

5. Power Supply: 24V~ +/-10% or 2 x AAA alkaline

batteries

6. Rating: 24V~ 50/ 60Hz 1A max

7. Terminals: 2mm

2

cable

8. Operating Temperature: 0~50°C/ 32~122 °F

9. Storage Temperature:

-5~50°C/ 23~122 °F

10. Sensing Element: NTC thermistor

Due to continual product improvement these specifications
are subject to change without notice.

Warranty – One Year Return to Base.

Smart Temp Australia Pty Ltd
Unit 20, 1488 Ferntree Gully Road
Knoxfield Vic 3180

Tel [phone]

www.thermostat.com.au

130508

<Up> key

<Down> key

<ENT> key

Mode Type

<Up> key

<Down> key

<ENT> key

Function
type

<NEXT> key

Setting