Gree GUHD09NK3FO Service Manual page 49

U-Match Series DC
Inverter Service Manual
7.2.7 Reserved fresh air valve interface for duct type unit
For the reserved connection way of air valve performer, connect it to F,C,O of wiring board according to
the wiring diagram. Connect the public port of air valve to F, connect CLOSE to C and connect OPEN to O.
7.2.8 Interface of anion generator
For the cold plasma anion generator, connect the red line to HEALTH(X4) and the blue line to N2(X6)
according to the principle circuit. The detector of cold plasma anion generator should be places at the air return.
7.2.9 Chassis electric heating belt of outdoor unit is optional
When outdoor ambient temperature is very low, electric heating belt can be equipped on the chassis to
prevent freezing of the chassis.
46
Figure 2-7-17
Figure 2-7-18
Port VA-1 of main
Electric heating belt is
control board
Electric heating belt
connected to Port VA-1
Figure 2-7-19