6
Refrigerant Piping Connections
From
Outdoor
Unit
First Elbow or
Branch Pipe
Conection
>36”
>36”
To
Indoor
Unit
MS
Box
Figure 3. Mode Selection Box Piping
WARNING
Refrigerant leaks are unlikely; however, if a refrigerant
leak occurs, open a door or windows to dilute the
refrigerant in the room. Turn off the unit and all other
appliances that may cause a spark. Call a licensed
professional HVAC technician (or equivalent) to repair
the leak.
Use only R410A refrigerant to charge this system. Use of
other refrigerant or gas will damage the equipment.
Do not allow air or other contaminants to enter system
during installation of refrigerant piping. Contaminants
will result in lower system capacity and abnormally high
operating pressures and may result in system failure or
explosion.
Insulate all refrigerant piping.
Refrigerant pipes may be very hot during unit operation.
Do not allow contact between wiring and bare copper
pipes.
After refrigerant piping connections have been
completed, check the system for leaks per
commissioning instructions.
IMPORTANT
Do not remove seals from refrigerant piping stubs until
connections are being made. This will prevent dust or
water from getting into the refrigerant piping before it is
connected.
WARNING
The Mode Selection Box is factory
fi
tted with Black
plastic caps over the
fl
are connection points. These
must be replaced with the supplied brass
fl
are nuts.
Under no circumstances can the plastic caps be used
as a permanent seal even when not all ports are used.
A suitable blanking device must be
fi
tted on all unused
ports.