Table of Contents
Advertisement
When using this type of fan (fan with direct-coupled motor-wheel), a frequency converter is neces-
sary to reach the operating point.
7.5 Electric heaters
An electric heater is designed to heat the airflow, which is stated on the technical data sheet, from
the specified air inlet temperature to the air outlet temperature. TRANE provides electric heaters
with one or more stages according to customer requirements.
The control of the electric heater provided by the customer can be carried out in several ways:
On-Off at single-stage electric heater (this type of control decreases the lifetime of the electric
-
heater under circumstances significantly)
On-Off at multistage electric heater
-
Continuous (e.g. with suitable thyristor control)
-
Fire risk!
With electric heater in operation, the heating elements may arrive to a tempera-
ture of several hundred °C.
In case of malfunction – heater in operation without adequate airflow – inadmis-
sible temperatures may occur. Plastic parts as for example filters, gaskets, drop-
let eliminators etc. close to electric heater may become damaged or even catch
fire. Subsequent damages up to fire spread to the building are possible.
In order to avoid the above mentioned risks TRANE provides as a standard electric heaters with 2
independent safety thermostats.
7.5.1 AHUs equipped from TRANE with control ETAMATIC
The recommended execution and function as described in chapter 7.5.2 (AHUs which are not
equipped from TRANE with control (which have to be equipped with controls on responsi-
bility of the client)) is included in the TRANE delivery. Units, which are supplied from TRANE with
control, are limiting the supply air temperature to a default value of 35°C.
7.5.2 AHUs which are not equipped from TRANE with control (which have to be
equipped with controls on responsibility of the client)
Supply of TRANE contains:
2 independent safety thermostats
-
assembly of the safety thermostats
-
The safety related correct implementation of control has to be carried out on full responsibility of
the client.
The safety related correct implementation of control has to be carried out on
side in full responsibility of the client.
TRANE proposes a safety concept as specified below as minimum requirement:
Advertisement
Table of Contents
