Specifications

Installation EDUS39-600-F20_b
21 FXOQ-M
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VRV engineering data for line sizing details.
Ductwork
Ductwork should be fabricated and installed in
accordance with local and/or national codes. This
includes the standards of the National Fire
Protection Association for installation of Air-
Conditioning and Ventilating Systems, NFPA No.
90B.
The vast majority of problems encountered with
combination heating and cooling systems can be
linked to improperly designed or installed duct
systems. It is therefore highly important to the
success of an installation that the duct system be
properly designed and installed.
All ducts should be suspended using flexible
hangers and never fastened directly to the structure.
Use flexible duct collars to minimize the transmission
of vibration/noise into the conditioned
space. If electric heat is used a non-flammable
material is to be used
Refrigerant Piping
Refrigerant connections are 3/8” ODF Liquid and
3 /4” ODF (12-30) or 7/8” ODF (36-48). Refer to
outdoor unit manufacturers recommendation on
line sizing.
Condensate Drain
Determine the drain connections to be used and
note the difference between the primary and
secondary openings.
Use screwdriver to remove webbing from selected
openings.
It is recommended that ¾ “ male pipe thread PVC
fittings be used at the condensate pan. Do not over-
tighten.
Tubing for all condensate drains should be a
minimum of 7/8” OD.
The drain should be pitched downward 1” per 10’.
Install a 3” trap as close to the coil as possible.
Route drain line so that it does not interfere with
accessibility to the coil, air-handling system or filter
and will not be exposed to freezing temperatures.
If line makes a second trap, or has an extended run
before termination, a vent tee should be installed
after the trap closest to the pan.
Connect the primary drain and route toward an open
drain or sump.
If the coil is located in a living space where damage
may result from condensate overflow, a separate ¾”
drain must be provided from the secondary drain
connection. Run this drain to a place in compliance
with local installation codes where it will be noticed
when unit is operational. Condensate flowing from
the secondary drain indicates a plugged primary
drain.
Be sure to prime the trap with water and test the line
for leaks. Test water flow also with unit in operation.