Quext Smart Thermostat and Lock
9
Installation Guide
Troubleshooting and FAQs
The Quext Smart thermostat manages the HVAC system via an AC voltage-powered solid-state interface. Upon demand,
it s24vac (R/Rc) to the Heating (W), Cooling (Y), and Fan (G). The solid-state interface does not operate in the
same manner as conventional open-contact relays and thus cannot be function tested in the same manner.
The Quext Smart Thermostat can be powered by either 24 volts AC or by internal batteries.
The solid-state interface
does not operate when the thermostat is operating on internal batteries only. For testing, the Quext Smart
Thermostat must be powered by 24 volts AC.
Steps to Test Quext Smart Thermostat
Heating Output
Note: This is when powered by 24 volts AC
A. Turn the rotary knob counterclockwise. Check to ensure the
Mode icon in the upper left quadrant of display
is flashing
B. Press the knob one time. A list should appear on the right side of the screen.
C. Rotate the knob counterclockwise until the flashing selection has moved to the
HEAT selection.
D. Press the knob one time. The display will then show the setpoint temperature for the
Heating output.
E. Rotate the knob as required to select the desired setpoint temperature and press the knob one time
▪
Note: the desired setpoint temperature should be set a minimum of 2 degrees above the ambient
temperature for the Heating cycle to be initiated.
F. The
Mode icon should then appear in the upper left quadrant of the display. After a period of 15 seconds
the
Fan icon will also appear.
▪ A multitest meter can now be used to test the thermostat heat control output.
G. Set the meter to read
AC voltage.
H. Measure voltage between
W (heat) and C (common).
▪ This measurement should nominally measure as 24 volts.
Cooling Output
A. Turn the rotary knob counterclockwise. The
Mode icon in the upper left quadrant of the display should
begin flashing.
B. Press the knob one time. A list should appear on the right side of the screen.
C. Rotate the knob counterclockwise until the flashing selection has moved to the
COOL selection.
D. Press the knob one time. The display will then show the setpoint temperature for the
Cooling output.
E. Rotate the knob as required to select the desired setpoint temperature and press the knob one time.
▪
Note: the desired setpoint temperature should be set a minimum of 2 degrees below the ambient
temperature for the Cooling cycle to be initiated.
F. The
Mode and Fan icons should then display in the upper left quadrant of the display.
▪ A multitest meter can now be used to test the thermostat cooling control output.
G. Set the meter to read
AC voltage.
H. Measure voltage between
Y (cool) and C (common).
▪ This measurement should nominally measure as 24 volts.
