Lennox International Inc. 505 - Manual (Page 5)

Page 5
EDA INSTALLATION/ SERVICE INSTRUCTIONS
General Installation Information
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause personal injury, loss
of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
The EDA unit may be used in upflow or horizontal dis-
charge installations. Slots around the inlet end of the EDA
cabinet are provided to secure the EDA unit to the duct
flanges of indoor coil/air handler cabinets. Use field-pro-
vided #8 x 1" long SDST screw (usually 6 required).
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working nearby these areas during
installation or while servicing this equipment.
Refrigeration
All EDA coils are shipped with a combination check/flow
restrictor. The restrictor is provided in the bag assem-
bly and must be installed. Refer to the appropriate high
and/or low side installation instructions for information on
the appropriate line sets. Refer to Lennox Refrigerant Pip-
ing guide (Corp. 9351−L9) for proper size, type, and ap-
plication of field−fabricated lines.
Releasing Air Charge
NOTE − EDA units use dry air as a holding charge.
CAUTION
The EDA coil is shipped from the factory pressur-
ized with dry air. Pierce a hole in the coil’s rubber
plug vapor line seal to relieve the pressure before re-
moving the seals.
Ensure that the coil is void of pressure. Remove the rubber
plug from the lines.
NOTE − If there is no pressure when the plugs are pierced,
check the unit for leaks before continuing with the installa-
tion.
Refrigerant Line Connections
NOTE − When connecting lines, be careful to avoid damag-
ing the 3−way diverting valve access panel. Place a wet rag
against the piping plate and around the EDA unit line con-
nections. A wet rag heat shield must be in place during
brazing to guard against damage to the paint.
Electrical Wiring
Electrical wiring diagrams are provided in figures 12 and 13
(see pages 14 and 15). Some modifications to certain units
may be necessary. Review the diagrams before installa-
tion to ensure all necessary components are on hand at
time of installation.
EDA Installation and Checkout Flow Chart
Follow the procedures in the flow chart in figure 4 while re-
ferring to the illustration in figure 5 to install the EDA: and
associated components.