tekmar 546 Thermostat Installation User Manual
Page 32
© 2008
D 546 - 07/08
32 of 44
Filter Change
Section J
To Clear
the filter
timer
+
Filter Symbol
Off
Freeze Protection
Cooling
3°C
37°F
On
Freeze Protection
Cooling
3°C
37°F
Cool
On
Cool
Off
On
On
Fan Pre and Post Purge
To prevent the fan from operating before the coil reaches
the proper temperature, the operation of the fan can be
delayed. Likewise the operation of the fan may continue
after the heating or cooling has been completed.
•
• All fan settings are found in the Adjust menu.
Coil or Duct Sensor Not Installed Operation
•
• During a call for heating, the fan turns on after the Fan
Delay time expires.
•
• After heating or cooling, the fan turns off after the Fan
Purge time expires.
•
• After Cooling, the fan immediately turns off.
Coil Sensor Installed Operation
•
• During a call for heating, the fan turns on after the coil
temperature exceeds the Heat Coil Minimum temperature
setting.
•
• During a call for cooling, the fan turns on after the
coil temperature falls below the Cool Coil Maximum
temperature setting.
•
• After Heating, the fan turns off after the Fan Purge time
setting expires.
•
• After Cooling, the fan immediately turns off.
Duct Sensor Installed Operation
•
• During a call for heating or cooling, the fan turns on after
Fan Delay time expires.
•
• After Heating the fan remains on until the duct
temperature falls below the Heatpurge Fan setting.
•
• After Cooling, the fan remains on until the temperature
rises above the Coolpurge Fan setting.
Freeze Protection
The thermostat provides freeze protection to the heating or
cooling coil when a duct or coil sensor is present. During
cooling, if the temperature falls below 37°F (3°C), the
compressor shuts off while the fan continues to operate.
During ventilation, if the coil or duct sensor temperature
falls below 37°F (3°C), the fan shuts off.
The thermostat records the number of hours that the Fan 1
contact runs. When Fan 1 run time exceeds the Filter time,
then a Filter symbol displays. Once you replace the filter,
the Filter timer can be reset using the Clear Filter item.
•
• To reset the Filter item, go to the Adjust menu and select
the Clear Filter item.
Time Clock
Section K
The thermostat has a built-in time clock to allow the
thermostat to operate on a schedule. A battery
-
less backup
allows the thermostat to keep time for up to 4 hours without
power. The time clock supports automatic adjustment for
Daylight Saving Time (DST) once the day, month, and year
are entered. Use the Time menu to set the correct time,
day, month, and year.
Daylight Savings Time Modes
Mode
DST Start
DST End
1
1st Sunday in April
Last Sunday in October
2
2nd Sunday in March
1st Sunday in November