Saswell T21STK-0 Operating Instruction
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Saswell T21STK-0 Operating Instruction

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T21STK-0
OPERATING
INSTRUCTION
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Summary of Contents for Saswell T21STK-0

  • Page 1 T21STK-0 OPERATING INSTRUCTION...
  • Page 2 T21STK-0 SINGLE STAGE THERMOSTAT 1 Heat / 1 Cool single stage thermostat. Non Programmable, Compatible with heat pump system Installation and Operation Manual Specification:------------------------------------------------------------------------- Power Supply: 20VAC-30VAC 50-60HZ or Battery powered. Terminal Load: 1.0A per terminal, 3.0A maximum total load Set Point Temp.
  • Page 3 FEATURES:---------------------------------------------------------------------------- • Large LCD display with backlight, continuous backlight option. • Simultaneous heat and cool set point storage. • Display of room temperature, set temperature and current time simultaneously. • Fan switch with ON and AUTO functions. • Permanent user setting retention during power loss. No batteries are required.* •...
  • Page 4 IMPORTANT SAFETY INFORMATION----------------------------------------- • Always turn off power at the main power source by removing the fuse, or switching the circuit breaker to the off position before installing, removing, cleaning, or servicing this thermostat. • Read all of the information in this manual before installing this thermostat.
  • Page 5 void the warranty. • Do not switch the system to cool if the temperature is below 50ºF (10ºC). This may damage the air conditioning system. • Replace batteries when the battery icon indicates the low battery message. • Change the Air Filter when the Filter Change Icon begins blinking. •...
  • Page 6 2. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off. 3. Remove the cover of the old thermostat. This should expose the wires. 4. Label the existing wires from the existing thermostat before removing.

  • Page 7: Install The Thermostat

    INSTALL THE THERMOSTAT ---------------------------------------------- ATTACH THERMOSTAT BASE TO WALL PULL THE COVER OFF THE BASE. Figure 1...
  • Page 8 WARNING！Electrical Shock Hazard Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat. 1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.
  • Page 9 6. Mark the placement of the mounting holes. 7. Move the base out of the way. Drill mounting holes. Use a hammer to tap in the supplied anchors into the mounting holes. 8. Fasten the base loosely to the wall as shown in Figure 1, using two mounting screws.
  • Page 10 CAUTION: Installing batteries backwards can damage the thermostat. 11. Install two fresh “AA” alkaline batteries in the battery compartment. Be sure to match positive (+) ends of batteries with positive (+) battery terminals in the battery compartment. (The thermostat will operate from 2 size “AA”...
  • Page 11 Fan operation switch Read the following information before setting the fan option switch (See figure 3). If you are unsure of your application, contact a qualified service person. This thermostat is configured from the factory to energize the fan on a call for heat.

  • Page 12: Battery Operation

    BATTERY OPERATION The thermostat will operate from 2 size “AA” alkaline batteries or 24VAC power. When operated from batteries, connection to the “C” (common) or (neutral) terminal is not required. NOTE: When operated from batteries only, the LCD display backlight will be lighted less than 5 seconds after each button pressed ,when backlight option are set to 2) or 3).

  • Page 13: Wiring Diagram

    WIRING DIAGRAM Figure 2 Typical wiring diagram for heat/cool, 5 wire two transformer system. In heat pump system, first you must select configuration menu 3 item. Or the Y terminal would not activated. In heat pump system, W & Y terminal reverse each other work.
  • Page 14 CHECK THERMOSTAT OPERATION----------------------------------------- If at any time during testing your system does not operate properly, contact a qualified service person. Turn on power to the system. Fan Operation Move the system switch to the OFF position. If your system does not have a “G”...
  • Page 15 2. Move the fan switch to the AUTO position. The blower should stop immediately. Heating system 1. Move the SYSTEM switch to the HEAT position. If the auxiliary heating system has a standing pilot, be sure to light it. 2. When the (FA)st heating cycle rate is selected in the configuration menu, (see configuration menu item 2), the thermostat will call for heat at 0.5ºF (0.5ºC) below set-point, and turn off at set point.
  • Page 16 Cooling System CAUTION: To prevent compressor and/or property damage, if the outdoor temperature is below 50ºF (10ºC), DO NOT operate the cooling system. 1. Move the SYSTEM switch to the COOL position. 2. When the (FA)st cooling cycle rate is selected in the configuration menu, (see configuration menu item 2), the thermostat will call for cooling at 0.5ºF (0.5ºC) above set-point, and turn off at set point.
  • Page 17 operate properly, the thermostat is installed correctly. THERMOSTAT LCD DISPLAY Figure 3...

  • Page 18: Thermostat Buttons And Switches

    THERMOSTAT BUTTONS AND SWITCHES 1 Raises or lowers the temperature setting OFF mode Selects options in the configuration menu. 3 OFF mode Hold the down button enter into clock setting mode Fan control switch (On /Auto System control switch ( HEAT /OFF/ COOL...
  • Page 19 THERMOSTAT OPERATION-------------------------------------- 1. Setting the thermostat This thermostat is very easy to operate. Set the SYSTEM switch to either HEAT or COOL, then press the ▲ or ▼ buttons until the temperature you want to maintain is shown on the right side of the display.
  • Page 20 Move the SYSTEM switch to the HEAT or COOL position to exit the setting menu. If no buttons are pressed within 15 seconds , the thermostat will exit the configuration menu. 3. Filter review Move the SYSTEM switch to the HEAT or COOL position, then press and hold the ▲...

  • Page 21: Troubleshooting

    Troubleshooting ---------------------------------------------------------------- If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermostat by pressing the reset button (See Figure 4). If the thermostat has power, and has been reset and still does not function correctly, contact your heating/cooling service contractor .
  • Page 22 2. Select heating cycle rate The FA setting is used to produce shorter heating cycles. The SL setting produces a longer heating cycle. Both settings produce very accurate temperature control and can be set to your personal preference. FA cycles the system at a 0.5ºF (0.5ºC) differential, and SL cycles the system at 1.5ºF (1.5ºC).
  • Page 23 conditions. Select 1 for NO backlight display. Select 2 for the backlight to come on for approximately 30 seconds when any button of the thermostat is touched. Select 3 for the backlight to remain on continuously. NOTE: When operated from batteries only, the LCD display backlight will be illuminated less than 5 seconds after each button pressed ,when backlight option are set to 2) or 3).
  • Page 24 CANCEL THIS FEATURE. When Filter Alarm is displayed, you can clear it by pressing the ▲ and ▼ buttons. This resets the timer and starts counting the days until the next filter change. 6. Select ºF or ºC readout Changes the display readout to Centigrade or Fahrenheit as required.

  • Page 25: Configuration And Operation

    To protect the compressor from short cycling, you can select compressor off-time cycle between 0 to 5 minutes. When the thermostat compressor time delay occurs, the Cool On or Heat On display will flash during compressor lockout. CONFIGURATION AND OPERATION The configuration menu allows you to set certain thermostat operating characteristics to your system or personal requirements.
  • Page 26 no buttons are pressed within 2 minutes, the thermostat will exit the configuration menu. The configuration menu chart summaries the configuration options. An explanation of each option follows.
  • Page 27 Mark: RESET function. This function can help operator to recovery system when fault happened , display outoforder or system halted. Please use a pin to insert in button RESET hole till sounded click, then loosen it. Switch on thermostat and observe it, if there still have troubles, please don’t hesitate to contact with local agency for warranty.

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