Haier 2U18MS2VHB Service Manual page 83

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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Fresh Air Function
When there is fresh air signal received by the Indoor Unit PCB
(the fresh air signal can be sent by infrared remote controller
or wired controller), the Normal fresh air function is valid.
When a call for Fresh Air is received, via the wireless or wired
controller, the unit will enable the standard fresh air function.
This function can be activated at any mode except defrost
mode. When the IDU been turned off by controller, the fresh
air function is invalid. This function can be activated in any
mode, except for defrost mode. When the Indoor Unit has
been turned off via the controller, the fresh air function will be
disabled.
Call for Fresh Air is Received:
In Cooling / Dehumidification mode:
The fresh air output will maintain a 20 minutes ON, 20 minutes
OFF cycle after the compressor starts.
This cycle will be active until one of the following occurs:
• Fresh air function is canceled via the controller (wired
controller or wireless remote controller)
• Indoor unit has been via the controller
• The compressor stops.
In Fan Only mode:
The fresh air output will maintain a 20 minutes ON, 20 minutes
OFF cycle
This cycle will be active until one of the following occurs:
• Fresh air function is canceled via the controller (wired
controller or wireless remote controller)
• Indoor unit has been via the controller
Components
Topic Title
MID-STATIC DUCTED TECHNICAL OVERVIEW
In Heating mode
The fresh air output will maintain a 20 minutes ON, 20 minutes
OFF cycle after the compressor starts.
This cycle will be active until one of the following occurs:
• Fresh air function is canceled via the controller (wired
controller or wireless remote controller)
• Indoor unit has been via the controller
• The compressor stops.
• The system enters into Defrost Cycle.
Special Fresh Air Function (Canadian Ventilation Mode - Mid
Static Ducted Only)
Special fresh air function (Canadian ventilation mode) is valid
when DIP switch SW3_1 is set to the ON position, and invalid
when DIP switch SW3_1 is set to OFF position.
When this function is enabled and the Indoor Unit is ON,
the the unit will proceed Continuous Fresh Air, keeping
the Indoor Fan Motor energized even if the compressor is
stopped or the IDU reaches it's real setpoint temperature (real
setpoint=customer set point + compensation point).
Notes:
• During an active Call, the fan motor speed will be whatever
setting the customer has set it to. Once the Call is satisfied,
the fan motor speed will be set to a special Low setting that
corresponds to the ESP setting.
• During a Defrost Cycle, the indoor fan is disabled, along with
the Fresh Air Function
G-5

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