compensation is not included in the unit and must be
provided. Riser end caps, air vents, and/or ushing loops
must be provided at the jobsite by the installer.
Proper eld riser installation and vertical positioning in the
unit should have a pipe run-out to the service valves which
are centered in the knockout access slots and that slope
down slightly away from the riser (see Figure 6). This prevents
condensation from running back to the riser and possible
damage from dripping at the bottom of a riser column.
Each job has specic requirements and satisfying those
requirements is the responsibility of the installer.
Riser to Unit Installation
Ball
Valve
Riser Stubout
Insulation
Threaded
Fitting
Unit insulation
Outer
Cabinet
Riser Knockout
Slot
Figure 6
Before making the riser joints, the riser insulation must be
pulled back away from the joint and protected from heat
during the brazing process. Each riser joint must be in vertical
alignment. Variations in oor-to-oor dimensions may
require eld work such as cutting o or extending the risers.
This operation is the responsibility of the installer. The riser
joint ller material must be selected to withstand the total
operating pressure (both static and pumping head) to which
the system will be subjected. Low temperature lead alloy
solders such as “50/50” and “60/40” are normally not suitable.
Figure 7
Back-up
Wrench
Ball
Valve
Wrench
Swivel
Connection
Figure 8
Riser to Drain Installation
Drain Pan
Drain
Clamp
Clamp
Riser Knockout
Unit Insulation
P-Trap
Unit Wall
Riser
Riser Stubout
Figure 9
1. After the applicable Supply, Return, and Drain knockouts
have been removed, carefully position the unit so that
the riser ball valves penetrate into the unit through the
riser knockouts making sure the insulation penetrates
into the unit as shown in Figures 6, 7, and 9.
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