Lennox International Inc. MERIT 51M32 - Manual (Page 11)

Page 5
Figure 13
Display of Filter Reminder
ROOM
72
FILTER
FAN
AUTO
SYSTEM
HEAT
Balance Point
NOTE − The balance point is only available with the out-
door sensor.
If the optional outdoor sensor (X2658) is connected to the
thermostat, balance point adjustment is available. The bal-
ance point feature allows the measured outdoor tempera-
ture to govern operation of the heat pump and backup heat
source.
Use the SETTINGS button to access the balance point set-
ting. If the outdoor sensor is attached to the thermostat,
press the SETTINGS button twice to access the Balance
Point Settings screen (see figure 14).
Balance Point Setting
Figure 14
6P
SETPOINT
55
The balance point can be set at any temperature between
1°F and 55°F (−17°C to 13°C). A balance point setting of
zero disables the balance point function (in this case, the
thermostat behaves as if no outdoor sensor is attached).
The default balance point setting is 55°F.
To adjust the balance point up or down, press the UP or
DOWN arrow keys to the right of the display screen. The
balance point setting will increase by 1°F each time the UP
key is pressed. The balance point setting will decrease by
1°F each time the DOWN key is pressed.
After the desired balance point is reached, the HOME
screen will reappear after about eight seconds.
NOTE − The balance point feature allows the temperature
to rise or fall 3°F above or below the setpoint. This prevents
excessive cycling of the equipment when the outdoor tem-
perature is near the balance point. For example, if the bal-
ance point is 40°F and the actual outdoor temperature is
35°F, the outdoor temperature must rise to 43°F before
equipment adjustment occurs. Conversely, if the balance
point is 40°F and the actual outdoor temperature is 45°F,
the outdoor temperature must drop to 37°F before equip-
ment adjustment occurs.
Service Indicator
When abnormal equipment operation is detected, the
SERVICE indicator will flash on the upper-right corner of
the screen. This indicates that the equipment requires ser-
vice from a qualified service technician. The SERVICE indi-
cator is shown in figure 15.
Figure 15
Service Indicator Flashing
ROOM
73
SERVICE
FAN
AUTO
SYSTEM
HEAT
Thermostat RESET
Under some abnormal conditions, it may be desirable to re-
set the thermostat to its default condition. The RESET but-
ton can be used to return the unit to normal operation after
an occurrence such as an electrical storm or power outage.
The RESET button is an unlabeled, recessed button lo-
cated behind the door on the right−hand side of the thermo-
stat, just below the SETTINGS button. The RESET button
is visible in figure 3. Use a paper clip or small pencil to press
the RESET button. After the RESET button is pressed, the
thermostat settings will return to the defaults listed in the
Default Settings section.