IM 745-3
4
www.DaikinApplied.com
Drain Pipe Connection - Per Local Codes
The drain pipe can be PVC or steel. Connect the drain pipe to the
unit. Pipe insulation is recommended to avoid condensation. The
suggested slope of the drain pipe is at least 1/8" per foot, but local
code will prevail. Refer to
Figure 3
for typical piping installation.
Suggested Condensate Trapping
The condensate trap provides the water seal (water level in the
condensate trap) to prevent the flow of air from the condensate
drain line into the coil section during normal operation.
Improper trapping can lead to several problems. If the trap is
too tall, back pressure will prevent drainage, causing conden-
sate backup. If the trap is too short the seal will be destroyed
or nonexistent, producing the same effect as a non-trapped
system.
The trap should be constructed of 7/8" clear plastic piping. The
condensate piping from the drain trap must be sloped to facilitate
proper drainage. The clear plastic trap should be clamped and
removable for cleaning. It may be necessary to manually fill the
trap at system start-up, or to run the unit for sufficient time to build
a condensate seal. The condensate trap and condensate piping
drainage should be free of any foreign debris. Foreign debris can
prevent proper operation resulting in condensate buildup.
Figure 4: Suggested Condensate Trap
Condensate
Pan
7/8" I.D.
C
A
B
A
B
C
1
1
/
2
"
3/4"
3
1
/
8
"
Interface Control Junction Box Wiring
Wiring connection must be completed according to the wiring
diagram on the unit.
The unit must be GROUNDED. Installation of all field wiring
must comply with NEC and local codes.
WARNING
A means for disconnect from electrical supply shall be
provided according to NEC or local codes. Confirm that the power
has been switched OFF before installing or servicing the unit.
Figure 5: Interface Control Junction Box (Left End Shown)
Interface Control
Junction Box
Figure 6: Interface Control Junction Box Detail
3
2
5
1
4
7
6
Table 1: Figure 6 Number Descriptions
Item
Description
1
Control Module, MC722
2
Transformer, 24V
3
Terminal Block, HP
4
Terminal Block, HP
5
Middle Metal Sheet for Terminal Block Installation
6
Bush, ?43
7
Metal Sheet
I
nstallatIon
