Ductwork, Access Holes, Condensate Drain Connection - LG ARND DCR4 Series Installation Manual

INSTALLATION

Ductwork, Access Holes, Condensate Drain Connection

Ductwork Configuration
When connecting ducts, install a canvas duct between the main body and the duct.
• Use non-combustible duct components.
• Install sufficient insulation to prevent condensation forming on outlet duct flanges and outlet ducts.
The contractor is responsible for providing transitions to accommodate difference in sizing between the unit and the building ducts. Duct
connections to collar-type openings can be made with S-cleats or overlapping joints. Apply caulk around each duct connection. Failure to
seal duct connections can cause air leaks and system performance problems.
When an air duct that carries supply air or warm air passes through a combustible roof, a clearance of one inch must be maintained between the
outside perimeter of ductwork and any combustible materials, per NFPA Standard 90A.
Access Holes
Figure 2: Split Compact DOAS Access Holes (Bottom).
Two (2) knock out / access holes are provided on the cabinet for
power wiring and communications cable connections.
Condensate Drain Connection
Figure 3: Flexible Drain Hose.
All condensate drain connections must be properly trapped and primed before operating the unit. Failure to
Split Compact DOAS has a factory-mounted condensate pump that operates continuously while the unit
is in cooling mode. The pump has an internal high-level float switch that will shut off the DOAS unit if the
water level in the pan gets too high.
The unit has a flexible drain hose kit and one (1) or two (2) clamps. The hose can be used to connect
the condensate pipe to the condensate pump connection. There is the option to directly connect a 1 NPT
fitting to the drain pan's gravity drain connection.
When the receiving drain line is mounted horizontal, connect the inverted trap to the top half of the pipe.
The connection point of the inverted trap to the building drain pipe must always be to the top half of the
pipe and must never be over 45° either side of the upper most point of the horizontal building drain line.
If connecting to a vertical drain line or plumbing system vent line, connect the unit condensate pump
discharge line using a Y-45 fitting with the double end of the Y-45 fitting facing up. When connecting to a
vertical drain line include an inverted trap at the top of the unit condensate pump discharge riser before
connection to the Y-45 fitting.
Due to our policy of continuous product innovation, some specifications may change without notification.
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