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from the exhaust emissions.If a furnace or air handler is installed in an enclosed area such as a
garge, utility room or parking area and a carbon monoxide producing device is operated therein,
there must be adequate ventilation directly to outside.
This ventilation is necessary to avoid the danger of CO poisoning which can occur if a
carbon monoxide producing device continues to operate in the enclosed area. Carbon
monoxide emission can be (re)circulated throughout the building if the furnace or air handler is
operating in any mode.
CO can cause serious illness including permanent brain damage or death.
3.3 Requirements for Communication Line
Note:
If the unit is installed in the place with strong electromagnetic interference, shielded wire
must be applied on the communication wire between indoor unit and wired controller. Twisted
pair line with shielding function must be applied on the communication wire between indoor unit
and indoor unit (outdoor unit).
3.3.1 Select communication line for indoor unit and wired controller
communication wire
Wire type
between indoor unit and
wired controller (m/feet)
Light/Ordinary
polyvinyl chloride
sheathed cord.
(UL60335-2011)
Total length of
Wire diameter
L≤250(850)
Fig 3.3.1
Wire standard
(AWG)
2×18~2×16 UL60335-2011
6
VRF DC Air Handler
Remark
1. Total length of
communication cable can't
exceed 250m (850feet).
2. The cord shall be Circular
cord (the cores shall be
twisted together).
3. If unit is installed in places
with intense magnetic field or
strong interference, it is
necessary to use shielded
wire.
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