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EARLY START
Heating - The early start function for heating ensures that the
zone is up to the proper temperature at the beginning of each
period. The
thermostat learns the recovery rate over multiple
setback events in order to determine the proper lead-time for the
zone. If both an air sensor and a slab sensor are used, the lead-
time is the greater of the air sensors or the slab sensor’s
requirements.
Cooling - The early start function, when used with cooling, allows the cooling system to turn on 30 minutes
prior to the beginning of a period that requires cooling.
Note: The Early Start feature occurs when the schedule changes
from a low temperature to a higher temperature.
AUXILIARY SENSORS
The thermostat has a single built-in sensor to measure air temperature at the thermostat. In addition to the
built-in sensor, the thermostat has terminals to connect one separate sensor. This sensor can be either
indoor sensors, slab sensors, a remote sensor, or an outdoor sensor.
Indoor Sensor
An indoor sensor is used to measure the air temperature in the zone that the thermostat is
controlling. The temperature being read by the indoor sensor is used in the calculations of the on
times for the relay(s) in the thermostat. If more than one sensor, either the built-in sensor or an
auxiliary sensor set as an indoor sensor, is being used to measure the zone temperature, the
temperature of the active sensors is averaged and used to calculate the on time of the relay(s).
Slab Sensor
A slab sensor is used to measure the slab temperature in the zone that the thermostat is
controlling. The temperature being read by the slab sensor is used in the calculations of the on time
for the Heat relay and allows the thermostat to operate the slab between the slab minimum and
slab maximum settings. If more than one slab sensor is used, the slab temperatures are averaged
by the thermostat.
Remote Sensor
A single remote sensor can be connected to the thermostat. The temperature measured by a
remote sensor does not affect the on time of the relays and is only used for display purposes.
Outdoor Sensor
A single outdoor sensor can be connected to the thermostat. The temperature measured by an
outdoor sensor does not affect the on time of the relays and is only used for display purposes.
ACCESS LEVELS
The REHAU Programmable Thermostat has two access levels. These
access levels restrict the number of items available in the menus of the
thermostat. The two access levels are Installer and User. This selection is
made using the DIP switch located on the circuit board inside the
thermostat.
1-OFF
2-OFF
The Installer access level allows the installer to adjust all of the setting in
the thermostat including those required to match the thermostat to the
mechanical system and the devices used. A “lock” icon is displayed in
lower right.
1-ON
2-ON
The User access level allows the end user to adjust the time, temperatures and schedules used by the
thermostat. A “lock” icon is displayed in lower right while in the MENU mode.
