12-10
CONTROL SYSTEM
SM ALPHA 1-E.3 GB
12.5.3 HE operation
• For all Groups, HE can be ON only when IFAN is ON.
• For all Groups, HE switches to OFF when ICT > 50
o
c, and is activated
again when ICT ≤ 45
o
c.
• In SH or RC group, HE operation is limited by the following graph:
• Back-up mode for SH group
After COMP has been working for 5 minutes, HE & IFAN are activated even
if the ICT is still below 35
o
c. This situation is called Back-up Mode. Both
HE & IFAN will work in Back-up Mode until the ICT reaches 35
o
c. Then, the
operation goes on in the usual mode .
HE
ON
OFF
30
45 50
ICT [
o
c]
15
General :
For WAX :
35
20
40
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