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/ 40F. 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
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