SYSTEM ENGINEERING
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HEAT PUMP CONDENSING UNIT ENGINEERING MANUAL
Due to our policy of continuous product innovation, some specifications may change without notification.
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PIPING DESIGN GUIDE
Header Fitting Installation End View
Header Inlet
Detail A (Figure 15)
Detail A—Figure 40—Header Fitting Installation
End View
Header Inlet
Figure 42: Header Insulation and Pipe Detail
Figure 40: Header Kit
LG Engineered Y-Branch and Header Kits
Header Kits
Note: Y-Branches can be
installed upstream between the
Header and the outdoor unit,
but a Y-Branch cannot be in-
stalled between a Header and
an indoor unit.
To avoid the potential of
uneven refrigerant distribu-
tion through a Header fitting,
minimize the difference in
equivalent pipe length between
the Header fitting port and each
connected indoor unit.
Header Insulation
Each Header kit comes with two
clam-shell type peel and stick insula-
tion jackets molded to fit each Header
fitting—one for the liquid line and one
for the vapor line as shown in Figure
42. See "Refrigerant Pipe System In-
sulation" on page 76 for pipe system
insulation information.
LG supplied insulation jacketLG supplied header
Field supplied copper pipe
Field supplied insulation
Field supplied copper pipe
Header kits are intended for use where
multiple indoor units are in close proxim-
ity to each other or where it would be
more economical to “home-run” the run-
out pipe segments back to a centralized
location. If connecting multiple indoor
units that are far apart, Y-Branches may
be more economical. See Tables 38 and
39 on page 4 for Header kit specifica-
tions and capacity.
Install Headers in a horizontal and level
position with the distribution ports of
the fitting in the same horizontal plane
as the straight-thru branch as shown in
Figure 41.
When connecting indoor units to a
Header, it is best practice to connect the
unit with the largest nominal capacity
to the port closest to the outdoor unit.
Then install the next largest indoor unit
to the next port working down to the
smallest indoor unit. Avoid skipping
ports. See Figure 40.
All indoor units must be mounted at
an elevation below the Header fitting.
All indoor units connected to a single
Header fitting should be located with an
elevation difference between connected
indoor units that does not exceed 49
feet. If indoor units are located at an
elevation the same as or above the
Header fitting, do not use a Header.
Instead install a Y-Branch fitting between
the outdoor unit and the Header fitting
and connect the elevated indoor unit to
the Y-Branch.
Connect IDUs
Detail A (Figure 41)
Largest IDU
Smaller IDUs
Figure 41: Header Kit—Must be installed level with
no rotation
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