Twin Units Installation - Daikin VHF Installation And Maintenance Manual

Twin Units Installation

Twin opposite hand units share a common riser system; i.e.,
supply, return, and drain riser. This is commonly called a
"master/secondary" arrangement. The master unit is shipped
with the risers attached. These special risers have stub-outs
for both the master unit and the secondary unit which must be
field connected and the following procedures must be followed
for all twin unit installations.
1 . Secondary units ship without risers and share common
risers with the master unit. Knockout holes on the
cabinet are provided for the 6" stub outs to make
piping connections to the coil supply and return and the
condensate drain.
Figure 49: Twin unit arrangement (side by side)
IM 986-11 • Vertical Stack WSHP
Secondary Unit in
Adjoining Room
6" Stubs on
Risers for
Secondary Unit
Stud Wall
Separating
Rooms
2 . Master units are offered in two-pipe systems with either
right-hand or left-hand connections. Secondary units are
offered to accommodate internal connections to any of
these riser systems or locations.
3 . The riser location (right or left) is determined by facing the
return air grille panel. The risers are located on either the
right or left of the unit. This defines the riser location. See
"Cabinet Configurations" on page
4 . The riser block-off plates are located in the base of
the secondary unit. Block-offs must be installed on the
secondary unit before putting it into position.
Master Unit
Common
Risers
37
i
nstallation
13.
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