tekmar 507 Thermostat Installation - Manual (Page 2)

© 2010 D 507 - 05/10 2 of 8
CYCLES PER HOUR
The thermostat operation is based on cycles per hour. 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 heating, the ON time
is reduced.
General
Display Symbols
Warning
Displays when an error exists.
Heat One
Displays when the heat contact
is on.
In order to prevent short cycling of the heating relay,
the thermostat ensures that the relay remains on or
off for a minimum amount of time.
The 507 Thermostat has an Auto Cycle. This allows
the thermostat to determine the best number of
cycles per hour that balances both temperature
swings and equipment cycles.
⇐ Cycle Length ⇒
Time
off off off on on on
Cycles Per Hour
MODE
Heat
In the heat mode, the Heat relay is operated to satisfy the temperature requirement of the
zone.
Off
In the OFF mode, the Heat relay is not operated.
NOTE: If an air sensor is active in the OFF mode, a freeze protection is enabled that allows
the Heat relay to be operated to keep the zone above 35°F (2°C).
Sequence of Operation