tekmar 511 Programmable Thermostat Installation - Manual (Page 2)

© 2012 D 510 - 02/12 2 of 16
EARLY START ( )
Display Symbols
Warning
Displays when an error exists.
Access Level
Displays when in the user
access level.
Heat One
Displays when the heat contact
is on.
Early Start
Displays when the thermostat
is in early start.
General
CYCLES PER HOUR (HEAT CYCLE)
The thermostat operation is based on cycles per hour. The number of cycles per hour is
adjustable through the HEAT CYCLE settings in the Adjust menu. During each cycle that
heating is required, the thermostat turns on the Heat relay for a calculated amount of time.
This amount of time is the “on time”. The on time is calculated based on the requirements of
the zone. If the zone requires more heating, the ON time is increased. If the zone requires
less heat, the ON time is reduced.
In order to prevent short cycling of the heating relay(s), the thermostat ensures that the
relay(s) remains on or off for a minimum amount of time.
An Auto Cycle setting is available for the
heating cycle. This setting allows the
thermostat to determine the best number of
cycles per hour that balances both temperature
swings and equipment cycles.
The early start function 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 sensor’s or the slab sensor’s
requirements.
⇐ Cycle Length ⇒
Time
off off off on on on
Cycles Per Hour
Occupied
70°F (21°C)
62°F (17°C)
70°F (21°C)
62°F (17°C)
UnOccupied
Early Start OFF
Early Start ON
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 up to two separate
sensors. These sensors can be either indoor sensors, slab sensors, a remote sensor, or
an outdoor sensor.