GB.PREHEAT.130225
Specifications are subject to change without notice.
2 www.swegon.com
3. Function
The preheating function
is a completely independent
control with its own duct temperature sensor. The tem-
perature sensor should be installed in a duct, at least 1.5
metres downstream of the air heater TBLE (viewed in
the direction of airflow, see figure below). The other air
heaters, TBLF and TCLF, can be fitted directly to the air
handling unit and the temperature sensor can then be
mounted inside the air handling unit after the filter.
The duct temperature sensor is required to prevent alarms
from tripping.
The control signal regulates the air heater to keep tem-
perature by sensor at the preset value.
The preheating control function begins when the supply
air fan is running and an airflow reading appears in the
terminal screen.
Air heater for hot water:
During the start-up phase, the preheating and postheating
air heaters simultaneously heat each airflow.
Electric air heater:
The air heater for preheating is cooled down according to
the same settings as those for the air heater for postheat-
ing.
The preheating function
does not include any capacity
reduction feature for unit operation in the low airflow
mode.
An overheating protection with normally-closed contacts
monitors the state of the air heater. If the contacts open,
an alarm is initiated.
Air heater for hot water with anti-frost monitor:
The heat-retaining function is automatically activated.
The limits for heat retaining and alarms are identical to the
limits of the air heater for postheating.
The anti-frost monitor sensor is required to prevent alarms
from tripping.
Air heater for hot water without anti-frost monitor:
No heat-retaining function and no alarm for a faulty anti-
frost sensor.
When heating is required and the outdoor temperature is
low, the relay for controlling the circulation pump oper-
ates in the same way as the GOLD control system’s regular
heating relay.
Exercising can be selected and operated in parallel with
the air heater for postheating.
1,5 m
Duct temperature sensor
The sketch shows air heater TBLE. When
having air heaters TBLF and TCLF, the air
heater can be fitted directly to the air hand-
ling unit and the temperature sensor can
then be mounted inside the air handling unit
after the filter.
