24 UNT-IOM-6
Before installing water piping supply and return lines to factory
piping package, note the following items.
• All piping connections are 5/8 inch O.D. (1/2 inch nominal) female
copper connections.
• The fan-coil supply and return piping should not interfere with the
auxiliary drain pan or condensate line. See “Connecting the
Condensate Drain” section on page 25 for more information.
• The installer must provide adequate piping system filtration and
water treatment.
• If the unit has a factory deluxe piping package, the piping includes
a strainer with a 20 mesh size screen, which allows minimal
protection from debris. Therefore, clean the strainer regularly.
NOTE: Maintain a minimum distance of one foot between the
reduction fitting for the 1/2 inch diameter line and the fan-coil piping
connections.
1. The factory piping package ships with brackets to adequately
support the piping during shipment. Remove these brackets before
connecting water piping to the unit. See Figure 9.
2. Close the piping end valves to the fully open position to prevent
damage to the valve seat during brazing.
3. Remove the auxiliary drain pan, if it is in place, to prevent expo-
sure to dripping solder or excessive temperatures.
4. Solder water piping connections to supply and return end
connections. Avoid overheating
factory soldered joints to
prevent the possibility of
leakage.
5. Insulate fan-coil piping to
auxiliary drain pan connections
and any piping that is not above
the auxiliary drain pan.
Piping Considerations
Connecting Water Piping to
Factory Piping Package
Factory Piping
Package
Connections
Figure 9. Remove the shipping
brackets which support the
factory piping package before
connecting piping.
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