Carrier XCT7 40VH A-7G Series - Defining Electric Control System

Installing Heat Reclaim Ventilation
Dening Electric Control System
Air Mode Switch: Delivered only through wire control matched with heat reclaim ventilation.
Airow volume can switch between "high speed" mode and "low speed" mode, "high air change" mode and "low air
change" mode.
Switch to Outdoor Fresh Air Mode:
When the unit operates in "high speed" mode and "low speed" mode, air coming indoors and air coming outdoors
have the same ow volume.
Air change mode is available in two scenarios as follow:
• Air volume coming indoors greater that air volume coming outdoors:
PCB Dial Code (SW903) Settings Shown as Below:
Unit operates in "high air change" mode or "low air change" mode and air volume coming indoors is greater than
air volume coming outdoors. This mode prevents humidity or unpleasant smell from coming indoors out of lavatory
or kitchen.
• Air volume coming outdoors greater than air volume coming indoors: PCB Dial Code (SW903) Settings Shown as
Below:
Unit operates in "high air change" mode or "low air change" mode, and air volume coming outdoors is greater than
air volume coming indoors. This mode stops unusual smell or air- borne bacteria from coming to hall out of
sickroom.
Dening Control System:
• Control operating heat reclaims ventilation with wire control.
• Operating status and parameter settings are displayed in wire control.
Independent System:
Controlled independently through wire control:
• Users shall procure control cable (500m long at most).
• For detailed operating instruction, refer to
Wire Control Operation.
Full Heat
Exchanger
Heat Reclaim Ventilation
Wired Controller
ENGLISH
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