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9.5 Dry contact function introduction
Chart 37
9
.5.1 Dry contact with low voltage output definition
● NSC: Night mode; when these two pins (Dn and Dc) are connected, the unit will enter night mode, it is
main for decrease the noise level (Optional).
● FSC: Forced shut off; when these two pins (Ds and Dc) are connected, the unit will be shut off. It can be
used for emergency.(Optional)
● FCHC: Forced cool or heat mode; these two pins are available only when outdoor unit is in mode by
dry contact set from HMI; Df and Dc open is forced cool mode; Df and DC short is forced heat mode
(Optional).
● PSC: Power shedding mode. When these two pins (Do and Dc) are connected, the unit will enter power
shedding mode. (Optional)
9.5.2 Dry contact with high voltage output definition:
●Alarm: Short La and Na, an alarm signal with 220V voltage will be sent out when there is fault in system;
●Base heater: Short Lh and Nh, 220v power will be supplied in some conditions.
9 fIeLD wIrING
