Comfort-Aire WDG Air Handler Series - Manual (Page 12)

12
Installation, Operation & Maintenance WDG AIR HANDLER SERIES Heat Controller, LLC
Evacuation and Charging the Unit
LEAK TESTING - The refrigeration line set must be pressurized
and checked for leaks before evacuating and charging the unit. To
pressurize the line set, attach refrigerant gauges to the service ports
and add an inert gas (nitrogen or dry carbon dioxide) until pressure
reaches 60-90 psig [413-620 kPa]. Never use oxygen or acetylene to
pressure test. Use a good quality bubble solution to detect leaks on all
connections made in the fi eld. Check the service valve ports and stem
for leaks. If a leak is found, repair it and repeat the above steps. For
safety reasons do not pressurize system above 150 psig [1034 kPa].
System is now ready for evacuation and charging.
Condensate Drain Tubing
Consult local codes or ordinances for specifi c requirements.
IMPORTANT: When making drain fi tting connections to the drain
pan, use a thin layer of Tefl on paste, silicone or Tefl on tape and
install hand tight.
IMPORTANT: When making drain fi tting connections to drain
pan, do not overtighten. Overtightening fi ttings can split pipe
connections on the drain pan.
• Install drain lines so they do not block service access to front
of the unit. Minimum clearance of 24 inches is required for
fi lter, coil or blower removal and service access.
• Make sure unit is level or pitched slightly toward primary drain
connection so that water will drain completely from the pan
(See Figure 5).
• Do not reduce drain line size less than connection size
provided on condensate drain pan.
• All drain lines must be pitched downward away from the unit a
minimum of 1/8” per foot of line to ensure proper drainage.
• Do not connect condensate drain line to a closed or open
sewer pipe. Run condensate to an open drain or outdoors.
• The drain line 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 line should it become necessary. Install a 3 in. trap in the
primary drain line as close to the unit as possible. Make sure
that the top of the trap is below connection to the drain pan to
allow complete drainage of pan (See Figure 5).
• Auxiliary drain line should be run to a place where it will be
noticeable if it becomes operational. Occupant should be
warned that a problem exists if water should begin running
from the auxiliary drain line.
• Plug the unused drain connection with the plugs provided in
the parts bag, using a thin layer of Tefl on paste, silicone or
Tefl on tape to form a water tight seal.
• Test condensate drain pan and drain line after installation is
complete. Pour water into drain pan, enough to fi ll drain trap
and line. Check to make sure drain pan is draining completely,
no leaks are found in drain line fi ttings, and water is draining
from the termination of the primary drain line.
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Installation
It is always recommended that an auxiliary drain pan be installed
under a horizontally installed air handler.
Connect the auxiliary drain line to a separate drain line (no trap is
needed in this line) and terminate according to local codes.
NOTE: DO NOT use a torch or fl ame near the plastic
drain pan coupling.
NOTE: DO NOT tighten the drain pipe excessively.
Support the condensate piping and traps outside the
unit to prevent strain on the drain connection.
Figure 5: Condensate Drain Trap