Description of the control system:
The pre-heating exchanger will maintain a minimum required temperature before a heat exchanger.
The temperature sensor must be fitted directly after the pre-heating exchanger.
A PI control algorithm is implemented here. The 0-10 V controller output signal regulates the
pre-heating exchanger’s power consumption via a Triac controller.
Primary parameters:
Primary parameters:
Regulation form
By decreasing heat requirements:
•
Disconnect ”Electric preheater relay 1”
•
Disconnect ”Electric preheater relay 2” and activate
”Electric preheater relay 1”
•
Disconnect ”Electric preheater relay 1” and ”Electric
preheater relay 2”
“0-10 V”. Analogue heater control via a 0-10 V analogue output
(e.g. EFS-9XXX)
“single stage”. Electric preheater is On/Off controlled
“two-stage”. Electric preheater is controlled in two stages (On/Off).
As more heat is required, “Electric preheater relay 1” is first
switched on, then “Electric preheater relay 2” and in reverse sequence
switched off for less heat.
”Binary”. The electrical heater is digitally controlled in three stages
(On/Off). The heating elements in the heating battery must be sized
in 1/3 - 2/3.
By increasing heat requirements:
•
•
Activate ”Electric preheater relay 1”
Activate ”Electric preheater relay 2” and disconnect
” Electric preheater relay 1”
Activate ”Electric preheater relay 1” and ”Electric preheater relay 2”
•
O P E R A T I N G A N D I N S T A L L A T I O N I N S T R U C T I O N S L G
7 5 0 - L G 6 0 0 0
P A G E
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