12
Closet installation
Prior to installing the air handler make sure holes are cut into the for refrigerant tubing, drain line, electrical wiring, and control
wiring.
1. Remove the top shipping cover and corner posts.
2. Remove the bottom shipping cover.
3. Remove the blower and control box access panel (door).
4. Remove the coil compartment access panel (door).
5. Place the unit into position by sliding the unit over the duct opening until the opening in the unit lines up with the duct
opening in the oor.
6. Secure the unit to the oor by drilling two holes through the air handler base at the left and right front inside corners of the
cabinet. Use two screws to secure the unit to the oor.
7. Use calking, sealers, and/or tape to seal between the oor base and the opening on the unit or between the opening on the
unit and the duct in the oor.
8. Connect the electrical supply wires and the control wires in the control box.
9. Connect the refrigerant lines to the coil. DRY NITROGEN MUST BE FLOWED THROUGH REFRIGERANT LINES DURING
SOLDERING OPERATION.
10. Re-install the coil compartment access panel (door) and secure with the screws that were removed in step 3.
11. Re-install the blower and control box access panel (door) and secure with the screws that were removed in step 2.
Refrigerant piping
Air Handlers with DX type evaporator coils require liquid and suction piping sized in accordance with condensing unit
manufacturer’s instructions. The evaporator coils have sweat copper connections. Refrigerant lines should be soldered with silver
solder or high temperature brazing alloy.
DRY NITROGEN MUST BE FLOWED THROUGH REFRIGERANT LINES DURING SOLDERING OPERATION.
REFER TO OUTDOOR UNIT INSTALLATION MANUALS FOR PRESSURE CHECKING AND VACUUM DRYING PROCEDURES.
There are two refrigerant pipes of diering diameters:
t A smaller one for the liquid refrigerant
t A larger one for the gas refrigerant
t The inside of copper pipe must be clean & have no dust.
Prepare the connecting pipe referring to the list below.
t Refrigerant pipe diameters (inches)
18 24 30 36 42 48 54
Liquid pipe
1/4 1/4 3/8 3/8 3/8 3/8 3/8
Gas pipe
1/2 5/8 5/8 5/8 5/8 5/8 3/4
Cutting the pipes
1. Make sure that you prepared the required tools. (pipe cutter, reamer, aring tool and pipe holder)
2. If you want to shorten the pipe, cut it using a pipe cutter ensuring that the cut edge remains at 90° with the side of the pipe.
There are some examples of correctly and incorrectly cut edges below.
Oblique
Rough
Burr
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