Saswell SAS900MTK-0 User manual

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OPERATING
INSTRUCTION
SAS900MTK-0

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SAS900MTK-0 MULTI-STAGE THERMOSTAT
2 Heat / 1 Cool，Multi-stage thermostat
No Programmable, Not for heat pump system
Compatible with gas, oil, electric heat 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. Range: 45ºF to90ºF (7ºC to 32ºC).
Accuracy: +/- 1ºF or +/- 0.5ºC.
Dimensions: 5.1” W X 3.7” H X 1.2” D
Color: White
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.
Permanent user setting retention during power loss. No batteries are required.
Optional “AAA” batteries provide continuous time and temperature display during power loss.
Optional temperature display of Fahrenheit or Celsius scale.
Air Filter change Indicator.
Compressor short cycling protection available.

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Low Battery Indicator.
Display temperature calibration.
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.
Use a professional contractor to install this thermostat.
This is a 24VAC low-voltage thermostat. DO NOT INSTALL ON VOLTAGES HIGHER THAN
30 VAC.
ALL wiring must conform to local and national building and electrical codes and ordinances.
Do not short (jumper) across terminals on the gas valve or at the system control to test
installation. This will damage the thermostat and void the warranty.
Do not switch the system to cool if the temperature is below 50ºF (10ºC). This can damage
the air conditioning system.
This thermostat will not control your heating/air conditioning system without power. Two “AAA”
alkaline batteries are only used to provide continuous time and temperature display
during power loss. Installed batteries will allow programming prior to installation.
Replace batteries when the battery icon indicates the low battery message.
Change the air filter when the Filter Change Icon begins blinking.
Use this thermostat only as described in this manual.

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REMOVE THE OLD THERMOSTAT--------------------------------------------------------------------------------------------
WARNING!: Electrical Shock Hazard
1. 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.
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.
5. After labeling the wires, remove the wires from the wire terminals.
6. Remove the existing thermostat from the wall.
7. Refer to the following section for instructions on how to install this thermostat.
THERMOSTAT BUTTONS AND SWITCHES---------------------------------------------------------------------------------

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1Raises temperature setting
2Lowers temperature setting
3Selects clock set mode, Indicates filter time remaining, and selects menu items in the
configuration menu
4Fan control switch (ON, AUTO)
5System control switch (COOL, HEAT, OFF)
THERMOSTAT LCD DISPLAY---------------------------------------------------------------------------------

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6Filter Alarm: Indicates filter needs to be replaced.
7Alarm: When flashing, indicates a system malfunction
8Heat Setting: Temperature set-point in the Heating Mode
Cool Setting: Temperature set-point in the Cooling Mode
9Set-point temperature display
10 NO Icon indicates when the thermostat is in the 1st stage heat pump mode.
AUX +2 indicates when the thermostat activates auxiliary heating
11 Battery Icon: If the Battery Icon is flashing, batteries need to be replaced.
12 Indicates the thermostat is calling for HEAT or COOL
13 Indicates the current system switch position
14 Clock AM/PM indicator
15 Indicates the current day, or days being programmed
16 Indicates the current time of day or time of days being programmed.
17 Indicates the current fan switch position.
18 Indicates the current actual room temperature, or the current configuration menu number.
19 Indicates whether the displayed temperature is in ºF or ºC

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INSTALL THE THERMOSTAT-----------------------------------------------------------------------------------------------------
ATTACH THERMOSTAT BASE TO WALLPULL THE COVER OFF THE BASE.
Figure 1 Figure 2
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.
2. Place the system switch (COOL/OFF/HEAT) in the OFF position.
3. Place the FAN (AUTO/ON) switch in the AUTO position.

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4. Gently pull the cover straight off the base. (See figure 2.)
5. Put the thermostat base against the wall where you plan to mount it. (Be sure the wires will
feed through the wire opening in the base of the thermostat.)
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. Place a
level against the bottom of the base and adjust until level, then tighten the screws. (Leveling is
for appearance only, and will not affect thermostat operation.)
9. Insert stripped, labeled wires into matching wire terminals. See “Wiring Diagrams”, Section 3,
Figure 3.
CAUTION: Be sure exposed portions of wires do not touch other wires.
10. Tighten screws on terminal block. Gently tug on each wire to be sure of proper connection.
Double check that each wire is connected to the proper terminal.
CAUTION: Installing batteries backwards can damage the thermostat.
11. Install two fresh “AAA” 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 “AAA” alkaline batteries or 24VAC power. When
operated from 24VAC power, your thermostat will maintain time and continuously display the
temperature during a loss of AC power with the batteries installed).
12. Replace the cover on the thermostat by snapping it in place.
13. Turn on power to the system at the main service panel.

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14. Test thermostat operation as described in the following section.
ELECTRIC/GAS JUMPER (Fan Option)------------------------------------------------------------------------- --------------
Read the following information before clipping the non-electric heat jumper 1 (See figure 1). 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. If your system is an
electric heat that REQUIRES the thermostat to turn on the fan on a call for heat, place do not cut Jumper1.
If your system does not require the thermostat to energize the fan on a call for heat such as fossil fuel (gas,
oil, etc.), forced air system as well as hydraulic heating systems, place cut the jumper1.
BATTERY OPERATION------------------------------------------------------------------------------------------------------------
The thermostat is powered by 24VAC. Batteries are not required for proper operation, but with two “AAA”
batteries installed, your thermostat will maintain time and continuously display the temperature during a
loss of power.
WIRING DIAGRAMS---------------------------------------------------------------------------------------------------
Figure 3

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Note** When presented with 24VAC on “L” terminal, the “Alarm” icon will flash on the display.
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” (Fan)
terminal connection, skip to the Heating System.
1. Move the fan switch to the ON position. The blower should begin to operate.
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. Press ▲ to adjust thermostat setting above room temperature. The 1 stage heating should
begin to operate.
3. Both stages of heating system will begin to operate when the set point is 3℉（2℃） above
ambient. AUX +2 display will be shown. If +2 is flashing, the second stage will delay 15
minutes before starting. (See configuration menu 2)
4. Press ▼ to adjust temperature setting below room temperature. The heating system should
stop operating.
COOLING SYSTEM
CAUTION: To prevent compressor damage, if the outdoor temperature is below10ºC (50ºF),
DO NOT operate the cooling system.