Plumbing connections – FloAire Direct Expansion Coil Modules User Manual
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The airflow distribution screen is located on the incoming air side of the coil. This screen evens out the
airflow across the coil and allows for greater cooling efficacy. Removal of this screen may cause the coil
to freeze or more serious damage.
Plumbing Connections
There is one field plumbing connection required for proper DX coil operation. This is the drain pan
located under the DX coil. Depending on the size of the unit, the
coil can generate 5 gallons of water per hour. It is imperative that
the plumbing be sized accordingly. Also, it’s recommended that all
plumbing connections be sealed with Teflon tape or pipe dope.
Only 1” diameter PVC Pipe and low profile couplings should be
used. Additionally, the top horizontal length on the P-Trap should
be a minimum of 12”. No unions should be used. Add a clean out
as shown in the picture below.
The P-Trap drain should be attached to the end of the drain pipe on
the side of the unit. The trap is important for two reasons. First, it
can be piped to drain in the most convenient area. Second, it
keeps air from being drawn through the drain hole in the side of the
pan, impeding drainage.
Typical Cooling Coil Drain Trap
Compressor Installation and Connection
There are several connections that need to be completed before the unit will function. Depending on the
module you have selected, you may have only one suction line and one liquid line to connect. Otherwise,
there are two sets that will need to be connected.
Module
Connection size
Tonnage
(suction/liquid)
DXM1-1
1.625/1.125
3
DXM1-2
1.625/1.125
5
DXM1-3
1.625/0.875
10
DXM1-4
1.625/0.875
12.5
DXM2-1
1.625/0.875
5
DXM2-2
1.625/0.875
10
DXM2-3
1.625/0.875
15
DXM2-4
1.625/0.875
20
DXM3-1
1.625/0.875
10
DXM3-2
1.625/0.875
15
DXM3-3
1.625/0.875
20
DXM3-4
1.625/1.125
25
DXM4-1
1.625/0.875
20
DXM4-2
1.625/0.875
25
DXM4-3
1.625/1.125
30
DXM4-4
2.125/1.125
40
DXM5-1
2.125/1.375
30
DXM5-2
2.125/1.375
40
DXM5-3
2.125/1.375
50
All Coils are 2 circuit coils, except for
DXM1-1 and DXM1-2.