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UNT-IOM-6 21
Before installing field piping to the coil, consider the following .
· All coil connections are 5/8 inch O.D. (or 1/2 inch nominal) female
copper connections.
· The 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 detailed information.
· The installer must provide adequate piping system filtration and
water treatment.
· Condensate may be an issue (fan-coils only) if field piping does not
have a control valve.
Refer to Figure 6 for supply and return header locations.
CAUTION: When using a field supplied piping
package in a fan-coil unit, allow sufficient room to install
the auxiliary drain pan. In addition, piping package must
not extend over edges of auxiliary drain pan.
Piping
Piping Considerations
Units with
Hydronic Coil
Connections Only
Connecting field piping to coil:
1. Slide a 1/2 inch sweat connection coupling (installer provided) onto
the coil headers.
2. Remove the auxiliary drain pan, if it is in place, to prevent exposure
to dripping solder or excessive temperatures.
Figure 6. Supply and return header locations on the hydronic
coil.
!
2-Pipe
4-Pipe (C)
R
2-Pipe
4-Pipe (C)
S
R
S
4-Pipe (H)
Air flow
R
R
S
S
4-Pipe (H)
Air flow
Left end view of coil
Right end view of coil