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51M35 SERIES 5/2
NOTE − This thermostat will NOT automatically switch
from heating to cooling, or vice versa; operator involve-
ment is required. At the change of seasons, or to accomo-
date abnormal seasonal temperature swings, you must
manually select to the opposite conditioning (Heat or Cool)
program.
FAN − Controlling the Fan Operation
Use the FAN button to select either continuous fan mode or
auto fan mode.
To change from continuous to auto fan mode (or vice ver-
sa), press the FAN button. Note whether a fan icon in the
FAN box is present (indicating that the fan is running) or not
(fan not running).
If continuous fan mode is enabled (ON displayed in FAN
box − see figure 13), the fan will run continuously regard-
less of whether the heating or cooling equipment is run-
ning.
Heat
Prog
Fan
Settings
Cool
Hold
Enter
Day/Time
Using Fan ON
Figure 13
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67
PROG B
AM
PM
ROOM
FAN
ON
SYSTEM
HEAT
MO
°
If auto fan mode is selected (AUTO displayed in FAN box −
see figure 14), the fan will only run when the heating or
cooling equipment is running.
Heat
Prog
Fan
Settings
Cool
Hold
Enter
Day/Time
Using Fan Auto
Figure 14
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72
AM
PM
ROOM
MO
°
FAN
AUTO
SYSTEM
COOL
PROG B
SETTINGS − Filter/Maintenance Reminders
The 51M35 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 (shown below the Fan button in figure
14) once or twice for the desired reminder as shown in fig-
ure 15 and as described in table 1.
Reminder Settings Display
Figure 15
FILTER
OFF
MAINT
For FILTER,
press Settings
button 1 time
For MAINT,
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
to scroll
selections
day, 1 month reminder displays
in 2 calendar months.
Settings
(2nd press)
MAINT
Elapsed chronological time in
months (Off 6 12) Use this
(2
n
d
press
)
then Arrows
to scroll
mon
th
s
(Off
,
6
,
12)
.
U
se
thi
s,
for example, to remind yourself
when to perform routine checks
to scroll
selections
when to per
f
orm routine checks
or when to call a technician for
perodic preventive
perodic preventive
maintenance.
Enter Stores settings.
NOTE − The HOME screen will reappear about 15 seconds
after the final arrow button press. OR, press ENTER 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 16.
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PROG A B C D HOLD
FAN
ON
AUTO
SYSTEM
COOL
OFF
HEAT
78
Reminders
Figure 16
ROOM
SERVICE
°
FILTER
AM
PM
MO TU WE TH FR SA SU
MAINT
After the filter has been changed or maintenance per-
formed, reset the reminder by pressing the SETTINGS
button for 4 seconds. The screen will blink for a few mo-
ments to indicate that the timer has been reset.