Filter
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Page 6
505068M 07/05
Displaying Outside Temperature
Pressing the ENTER (Outside) button at the HOME
screen displays the outside temperature (see figure 15) for
several seconds, then returns to room temperature.
Check Outside Temperature
Figure 15
88
Fan
Settings
Hold
Enter
(Outside)
SETTINGS − Filter/Maintenance Reminders
The 51M39 thermostat is designed to remind you when the
filter needs changing or when routine maintenance is re-
quired, as (and if) defined, by you. These optional remind-
ers are not enabled until you activate them. To do so, press
the SETTINGS button once or twice for the desired re-
minder as shown in figure 16 and as described in table 1.
Reminder Settings Display
Figure 16
FILTER
OFF
MAINTENANCE
For FILTER, press SETTINGS
button 1 time
For MAINTENANCE, press
SETTINGS button 2 times
The default setting for the reminders is OFF (disabled).
Press Up/Down arrow buttons to select the desired re-
minder intervals.
Table 1
Filter and Maintenance Reminders
Buttons to
Use
Reminder
Available Settings and
How to Use
Settings
(1st press)
FILTER
Total fan run time expressed in
months (Off13612); for
(1
s
t
press
)
then Arrows
to scroll
mon
th
s
(Off
,
1
,
3
,
6
,
12)
;
f
or
example, if fan runs 12 hours a day,
1 month reminder displays in 2
to scroll
selections
1 month reminder displays in 2
calendar months.
Settings
(2nd press)
then Arrows
MAINTE-
NANCE
Elapsed chronological time in
months (Off, 6, 12). Use this, for
exam
p
le
,
to remind
y
ourself when to
then
Arrows
to scroll
selections
example
,
to
remind
yourself
when
to
perform routine checks or when to
call a technician for perodic
se
l
ec
ti
ons ca
ll
a
t
ec
h
n
i
c
i
an
f
or pero
di
c
preventive maintenance.
Enter Stores settings.
NOTE − The HOME screen will reappear about 15 seconds
after the final arrow button press. OR, press the ENTER
button at any time to store any changes and exit to the
HOME screen.
After either programmed interval has elapsed, the remind-
er will be displayed as shown in figure 17.
COOL
OFF
AUTO
EMG.
HEAT
I0:26
PROG
A B C D
HOLD
FAN ON
AUTO
FILTER SERVICE
MAINTENANCE
76
Reminders
Figure 17
ROOM
°
MO
AM
PM
COOL
OFF
AUTO
EMG.
HEAT
FAN ON
AUTO
FILTER SERVICE
MAINTENANCE
76
Service
Indicator
Flashing
ROOM
°
Filter &
Maintenance
Indicators
After the filter has been changed or maintenance per-
formed, reset the reminder by pressing the SETTINGS
button for 4 seconds at the corresponding reminder set-
tings screen. The screen will blink for a few moments to in-
dicate that the timer has been reset.
Service Indicator
When abnormal equipment operation is detected, the
SERVICE indicator will flash on the screen (see figure 17).
This indicates that the equipment requires service from a
qualified service technician.
Thermostat RESET
Under some abnormal conditions, it may be necessary to
reset" the thermostat to its default condition. Such a RE-
SET would delete all programming and settings and there-
fore should only be used on rare occasions when the the
thermostat fails to function as designed and/or as pro-
grammed. Such an instance can occur as a result of a pow-
er surge or similar electrical disturbance (e.g. after an elec-
trical storm or power outage). The RESET button can be
used to recover from this situation.
CAUTION
When the RESET button is pressed, ALL settings re-
vert back to the defaults, including the default pro-
gram (see tables 2 and 3).
The RESET button is an unlabeled, recessed button lo-
cated behind the door on the right−hand side of the thermo-
stat, below the SETTINGS button (see figure 3). Use a pa-
per clip or small pencil to press the RESET button; ALL
thermostat settings will be reset to the defaults listed in the
Default Thermostat Settings section.