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Controlling Heat/Cool System
With a conventional heating/cooling system, you can set the system to: HEAT, COOL or OFF. With
a heat pump system, you can set the system to: COOL, HEAT, EM HEAT, or OFF.
Changing the System Setting
Heat
Cool
M1550
4
AM
Manually change
the system
setting.
Press and release until the
display shows the desired
system status.
HEAT: The thermostat controls your heating system according to the schedule you programmed.
Heat pump models display AUX and the indicator light flashes denoting auxilliary heat
element operation, see Table 1.
EM HEAT: The emergency heater element of the heat pump is enabled.
COOL: The thermostat controls your cooling system according to the schedule you pro-
grammed.
No status displayed: Both the heating and cooling systems are off.