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© 2008 D540e - 02/08
Display
Range
Description
Auto, 10 to 90%,
On
Default = Auto
FAN
Set the minimum percentage the fan should operate while in
the event. This provides ventilation for the building.
Available when:
•
•
Ventilation is set to On.
Auto, SYn
Default = Auto
HEAT CYCLES PER HOUR
Select either Auto cycle or Synchronize with other thermostats
on the tN4 system.
Available when:
•
•
There is no reset module on the tN4 bus.
1 or 2
Default = 1
SCHEDULE
Thermostat can follow schedule 1 or 2.
Available when:
•
•
Switch setting 1 is set to Setback (On Position).
Heating Operation
Sequence of Operation
The thermostat operates the heating system to maintain
the Set Room Heat temperature. The heat source can
be either hydronic or other. This is selected by switch
setting 3.
When switch setting 3 is set to hydronic (On position), the
thermostat uses indoor temperature feedback and also
synchronizes the starting of a heating cycle.
When switch setting 3 is set to other (Off position), the
thermostat does not use indoor temperature feedback.
This allows the thermostat to operate non-hydronic
heating systems (i.e. furnace, electric baseboard, or
electric fan coil), while remaining connected to the tN4
communication system.
Cooling Operation
The thermostat operates the cooling system to maintain the
Set Room Cool temperature. The fan turns on whenever
the cooling system is on.
The cooling system has a fixed minimum on time of 2
minutes and a minimum off time of 5 minutes in order to
prevent cooling equipment short cycling.
Adjust Menu (2 of 2) *
for installer use only
ADJUS
T MENU
After the last item, the control returns to the first item in the Adjust menu.
Fan Mode
The fan operates with...
1
Cooling Only
2
Heating and Cooling
Fan Operation
The Fan Mode setting determines how the fan operates
with the heating and cooling systems.
Locate the Fan Mode setting in the Adjust menu.
The fan relay includes a post purge feature. After the
heating is shut off, the fan continues to operate for 30
seconds. After the cooling is shut off, the fan continues
to operate for 10 seconds.
The fan can also operate for additional time beyond what
is required for the heating and cooling systems in order to
provide ventilation to the building. Ventilation is provided
when Mode is set to Heat, Cool, Auto, or Vent. There is
no ventilation when Mode is set to OFF.
Locate the Ventilation setting in the Adjust menu and
set to On.
Once this is done, two additional settings are available
for the Fan minimum run time percentage during the
and events.
Locate the Fan and Fan settings in the Adjust menu
and set the desired percent run time per hour using the
or
button.
