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505050M 5/1/05
COOL − Using the Cool Mode
Enabling and Disabling Cool Mode
Use the COOL button to enable or disable cool mode as
desired. If the thermostat is in HEAT or OFF mode, cool
mode is enabled when the COOL button is pressed. This is
indicated by COOL in the SYSTEM box (see figure 9).
Turn Cool ON/OFF
Figure 9
I0:30
75
70
HOLD
AM
PM
SETPOINT
ROOM
MO
°
°
Heat
Prog
Fan
Settings
Cool
Day/Time
Hold
Enter
FAN
AUTO
SYSTEM
COOL
If the thermostat is in cool mode, pressing the Cool button
disables COOL mode (indicated by OFF in the SYSTEM
box − see figure 10).
SYSTEM
COOL
OFF
HEAT
75
Cool Mode Disabled
Figure 10
ROOM
°
75
SETPOINT
°
Cooling Demand
Set the thermostat to cool mode to control the cooling
equipment. Then, if the room temperature is higher than
the temperature setpoint, as shown in figure 11, the ther-
mostat detects a cooling demand and will activate the cool-
ing equipment to satisfy the demand.
i0:00
PROG A B C D HOLD
75
Cooling Demand
Figure 11
ROOM
°
70
SETPOINT
FAN
ON
AUTO
SYSTEM
COOL
OFF
HEAT
AM
PM
MO TU WE TH FR SA SU
°
Hi
Cooling operation is indicated by flashing snowflake"
icons in the SYSTEM box. When the actual temperature
drops below the temperature setpoint, the snowflake icons
will disappear. This indicates that the cooling demand has
been satisfied and that the cooling equipment has been
turned off.
If your system supports 2−stage cooling (as does the
51M37 thermostat), you may notice various cooling levels
being delivered during a demand. Also, if a small cooling
demand is present, "Lo" will be displayed in the SYSTEM
box. However, if a large cooling demand is present, "Hi" will
be displayed in the SYSTEM box (shown in figure 11).
NOTE − If no buttons are pressed during a demand for
cooling, the equipment must operate for at least 4 minutes.
After a demand has been satisfied, cooling equipment op-
eration is locked out for 5 minutes. If another cooling de-
mand occurs during this 5−minute interval, COOL" and the
snowflakes will flash; however, the cooling equipment will
not operate until the 5−minute delay has elapsed.