21
2. Before anchoring the equipment in place, the unit must be
leveled and the cabinet must be plumb and squared. The unit
may be anchored in place by bolting directly through the unit
floor or attaching to the cabinet in some location that will not
interfere with drywall or other items such as the supply grille,
thermostat, or return access panel. When attaching to the unit
cabinet, care must be taken to not penetrate the cabinet in
locations that may damage internal components or wiring.
The mounting technique is a matter of choice; however, the
unit should always be anchored securely to prevent move
-
ment during construction and riser expansion and contraction.
After anchoring the unit, it is then ready for the various ser
-
vice connections such as riser connections and electrical.
3. The plastic flare caps on the end of the riser ball valves
should be removed and discarded.
4. All universal stack units use reinforced braided stainless steel
flexible hose kits for piping between field-installed risers and
unit water coils as shown in Fig. 24. The hose kit design has
threaded connections on each end. The hose kits allow for
riser fluctuations due to thermal expansion.
Fig. 23 — 42SUA Unit Riser to Unit Installation Setup
Fig. 24 — 42SUA Unit Riser to Unit Installation
Fig. 25 — 42SUA Unit Riser to Unit Installation
(Tighten Swivel Connections)
Fig. 26 — 42SUA Unit Riser to Drain Installation
5. Use a wrench to tighten the swivel connections. Use a backup
wrench to hold the riser ball valve stationary to prevent it
from bending or twisting during installation as shown in
Fig. 25. Be careful not to over-tighten swivel connections.
6. Locate the unit’s coil fitting.
7. The plastic flare caps on the end of the coil fitting should be
removed and discarded.
8. Use a wrench to tighten the swivel connections. The baffle
acts as a secondary wrench. Be careful not to over-tighten
swivel connections.
9. Locate the p-trap drain and rubber hose factory installed to
the drain pan connection in the bottom of the unit as shown in
Fig. 26.
10. Push the rubber drain hose over the riser drain stubout. Be
careful not to bend the drain stubout.
11. Adjust the hose clamp over the riser stubout and rubber hose
to hold in place as shown in Fig. 26.
12. Test for leaks. Any and all leaks should be repaired before
proceeding with installation. When testing with air or some
other gas, it might be necessary to tighten stem packing nuts
on some valves to maintain air pressure in the riser. Pressure
testing risers with water should be done with the unit service
valves closed to prevent flushing debris into the unit valve
packages. This will also allow risers to be drained down after
testing in the winter to avoid freeze-up problems. In the event
that leaking or defective components are discovered, the sales
representative must be notified BEFORE any repairs are
attempted. All leaks should be repaired before proceeding
with the unit installation.
13. After system integrity has been established, the riser insula
-
tion must be pulled back into place over the joint and glued or
sealed to prevent sweating and heat loss or gain. All of the ris
-
ers, including the riser stubouts, should be properly covered
with insulation. Internally mounted chilled water piping and
valves are located over the drain pan and need not be
insulated.
Any fireproofing requirements where risers or piping penetrate
floors or walls are the responsibility of the installer. This work
should be done only after all pressure testing is completed. The
fireproofing method used must accommodate pipe expansion and
contraction and the piping must be protected from abrasion and
chemical attack. The pipe insulation also must be maintained to
Outer
Cabinet
Unit Insulation
Rise Stubout
Insulation
Ball
Valve
Threaded
Fitting
Flare
Cap
Riser Knockout
Slot
Flexible
Hose Kit
Riser Stubout
Insulation
Ball Valve
Riser
Coil
Baffle
Connection point to any factory
furnished and installed components.
Wrench
Swivel
Connection
Back-up
Wrench
Ball Valve
CAUTION
Hose connection torque requirements are 350 in. lb +10/
–0 in. lb to prevent leaks.
P-Trap
Drain
Clamp
Drain Pan
Unit Insulation
Riser Knockout
Clamp
Riser
Stubout
Unit Wall
Riser
