Manufacturer reserves the right to change specifications or designs without notice.
10.2019
Air Handler Unit Installation Instruction
19/20
7.
Pipe Connections
Keep the coil connections sealed until refrigerant connections are made. Refer to condensing unit installation
instructions for details on pipe size and insulation.
•
Coil is shipped with Nitrogen. Evacuate the system before charging with refrigerant.
•
Make sure the refrigerant pipes layout do not block service access.
•
Purge the refrigerant pipes and indoor coil with dry nitrogen while brazing.
•
Use a wet rag or an approved heat paste to protect the TXV sensing bulb during the brazing process.
Condensate Drain Connection
1.
Use a thin layer of Teflon paste, silicone or Teflon tape when making drain fitting connections.
2.
Do not over tighten fittings resulting in splitting pipe connections on the drain pan.
Figure 7-1 Condensate drain trap
•
Make sure the drain pipes layout do not block service access. Minimum clearance of 24 inches is required
for filter, coil or blower removal and service access.
•
Ensure the unit is level or pitched slightly toward primary drain connection so that water will drain smoothly
from the pan. All horizontal drain pipes must be pitched downward away from the unit a minimum of 1/8”
per foot of line to ensure proper drainage.
•
Do not reduce drain pipe size less than connection size provided on condensate drain pan.
•
Do not connect condensate drain pipe to a closed or open sewer pipe.
•
The drain pipe should be insulated where necessary to prevent sweating and damage due to condensate
forming on the outside surface of the line.
•
Make provisions for disconnecting and cleaning of the primary drain pipe if it become necessary. Install a 3-
inch trap in the primary drain pipe as close as possible to the unit. Make sure that the top of the trap is below
connection to the drain pan to allow complete drainage of pan.
•
Auxiliary drain pipe should be connected to a place where it will be noticeable. Homeowner should be
warned that a problem exists if water begins running from the auxiliary drain pipe.
•
Test condensate drain pan and drain pipe after installation is complete. Pour enough water into drain pan,
make sure that the drain pan is draining completely, no leaks are found in drain pipe fittings, and no water is
draining from the termination of the primary drain pipe.
