Lennox L7742U Programming And Application Manual page 17

SYSTEM TEST MODES After the thermostat has been installed and
set−up, the installer may run a system test function (accessed through
the installer settings menu), to test all cooling, heating, Emergency
Heating stages and FAN outputs. Scroll to SYSTEM TEST MODES
and press ENTER; select TEST OUTPUTS and press ENTER.
SYSTEM TEST MODES
TEST OUTPUTS
SCROLL arrows move through a list of all signals, Y1 ON, Y1 OFF, Y2
ON, Y2 OFF, etc. With a signal displayed, press ENTER to start the
test, (e.g. Y1 ON selected, press ENTER brings on Y1; Y1 OFF se-
lected, press ENTER shuts off Y1. CANCEL, pressed at anytime dur-
ing tests will return the previous screen and also disable any test and
puts the thermostat back into normal mode.
CAUTION
In dual fuel system applications, do not turn on heat pump and
furnace at the same time in system test mode.
All HVAC components can be tested to confirm the signals between
thermostat and unit are being sent and received.
NOTES − After 5 minutes without a test being initiated, the test modes is
disabled and system goes back to the normal mode (i.e. HOME
screen).
When in SYSTEM TEST MODE, the compressor minimum off timer is
bypassed.
TEST OUTPUTS
FAN (G) ON
FAN (G) OFF
O ON (B OFF)
B ON (O OFF)
ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat
Page 17
OFF
Y1 ON
Y1 OFF
Y2 ON
Y2 OFF
W1 ON
W1 OFF
W2 ON
W2 OFF
H ON
H OFF
D ON
D OFF