Enabling And Disabling Cool Mode; Cooling Demand - Lennox Merit 51M37 Operation Manual

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
MO
I0:30
AM
FAN
PM
HOLD
AUTO
SYSTEM
ROOM
75
70 SETPOINT 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).
Cool Mode Disabled
ROOM
75
SETPOINT
°
Figure 10
505050M 5/1/05
Heat Cool
Prog Day/Time
Fan Hold
Settings Enter
Figure 9
SYSTEM
COOL
75
OFF
°
HEAT

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.
Cooling Demand
MO TU WE TH FR SA SU
i0:00
AM
PM
PROG A B C D
ROOM
75
°
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.
Page 4
FAN
ON
AUTO
HOLD
SYSTEM
SETPOINT COOL
70
OFF
°
HEAT
Figure 11
Hi