tekmar 552 Thermostat Installation - Manual (Page 31)

© 2014 552_D - 09/14
31 of 44 A Watts Water Technologies Company
Air Group Operation Section C
In order to prevent heating and cooling at the same time, this thermostat can operate
together with other thermostats on a tekmarNet
® system to form an air group. On
older model thermostats the air group functionality was previously described as
a cool group.
In an air group, one thermostat is assigned as the air group master. The air group
master operates the cooling equipment for the group. This thermostat can be set
to be a member of the air group.
When operating as a air group, the air temperature readings of all the air group
member thermostats are communicated to the air group master thermostat and
an average temperature is determined.
When the air group master is in cooling operation, the air group member thermostats
do not operate the heating system for air heating.
If the Set Heat Room temperature is adjusted while the air group is cooling,
COOL is flashed on the display to alert the user that the air group cooling system
is presently on and heating is not available. Once the cooling system shuts off,
heating is available if required.
Air Group
tekmarNet Communication
Member Member Master
Time Clock Section D
The thermostat includes a time clock that is automatically visible in the Home
menu when a programmable schedule is used. If the schedule is not used, the
user has the option to select whether the time is shown in the Home menu.
During a loss of power, the thermostat continues to keep the correct time
and date for at least 4 hours. If the power is off for more than 4 hours, the user
will need to set the time.
The thermostat supports automatic update for daylight savings time. Simply set
Daylight Save to On together with the correct day, month, and year and the time
is automatically updated each spring and fall.
When connected to a tekmarNet ® system, adjustment of the time on one thermostat
updates all connected thermostats. This option can be disabled by selecting the
Local Network Group setting to be On.