Top Supply
Air Knockout
TOP VIEW
Electrical
Knockouts
Figure 3B
Knockout
Slot
Knockout
Tab
KNOCKOUTS:
Knockout
Knockout
Tab
Drain
Knockout
Supply and Return
Figure 4
Drain
Insulation
Cut Line
Supply and Return
Insulation Cutline
Figure 5
Supply, Return, and Drain Riser Installation
1. Three sides of each Universal Modular unit have four
Supply and Return riser knockouts along the center
and one Drain knockout near the lower part of the unit
(see Figure 3A). Identify whether your application uses a
2-pipe or 4-pipe conguration.
a. 2-pipe congurations: typically use the two inner
riser knockouts.
b. 4-pipe congurations: will use all four riser
knockouts.
2. Locate and mark the riser and drain knockouts that
apply to your particular unit application, insuring proper
orientation of the Return Air opening in room.
3. Insert a at head screw driver into knockout slot shown in
Figure 4.
4. Pry screw driver back and forth until knockout tabs break
away from the unit.
5. Discard knockout. Be careful of sharp edges.
6. Use a sharp retractable knife (see Figure 5) and vertically
cut the insulation down the center of the riser and drain
knockouts the full length of the knockout.
7. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
CAUTION: Toxic residues and loose particles
resulting from manufacturing and eld piping
techniques such as joint compounds, soldering
ux, and metal shavings may be present in the
unit and the piping system. Special consideration must be
given to system cleanliness when connecting to solar,
domestic or potable water systems.
Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed
BEFORE beginning the connection and testing of risers and
piping.
To assure optimal unit performance, the supply connection(s)
are marked on the unit’s coil with an “S” meaning supply or
inlet and “R” meaning return or outlet indicating ow direction
to and from the coil. Blue letters mark the chilled water
connections and red letters mark the hot water connections.
The unit’s internal piping is designed to accommodate a total
riser vertical movement of ±1-1/2”, due to thermal expansion
and/or contraction, when positioned properly at the job site.
Risers must be anchored to the building structure to limit
expansion and contraction movement to a maximum of 3”.
Riser anchoring and expansion
7
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