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5 - ELECTRICAL CONNECTIONS
HL1 unit shut-down signal
HL2 unit operating signal
Single power supply
• Connect the power supply to the XS1 terminal block
• Do not remove jumpers between XS1 and XS2 (see the
wiring diagram) .
XS1 single power supply input
The 400/3/50 units can be used with :
• Single power supply
• Double power supplì
(line at low cost active only in fixed time bands + line at
constant power supply)
BT3 outside air temperature probe( ductable unit)
SA1 remote ON-OFF
SA2 remote summer - winter (open = summer)
SA3 remote second set
SA4 domestic hot water request
XC2
XC2
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