Riser to Drain Installation
Drain Pan
Drain
Clamp
Clamp
Riser Knockout
Unit Insulation
P-Trap
Unit Wall
Riser
Riser Stubout
Figure 20
1. Carefully position the unit so that the riser ball valves
penetrate into the unit through the riser slot making
sure the insulation penetrates into the unit as shown in
Figures 17 and 18.
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’s floor or attaching to the buildings
walls through the cabinet walls in some location that
will not interfere with drywall or other items such as the
supply grille, thermostat, or return access panel. When
attaching sheetrock 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 the building to prevent
movement during construction and riser expansion and
contraction.
After anchoring the unit, it is then ready for the various
service 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 Mega Modular units use reinforced braided stainless
steel flexible hose kits for piping between field installed
risers and unit water coils as shown in Figure 18. Each
hose has threaded connections on each end. The hose
kits allow for riser fluctuations due to thermal expansion.
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 Figure 19. Be careful to not over tighten swivel
connections.
CAUTION: Hose connection torque
requirements are 350 in. lbs. +10/-0 in. lbs. to
prevent leaks.
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 to not over
tighten swivel connections.
CAUTION: Hose connection torque
requirements are 350 in. lbs. +10/-0 in. lbs. to
prevent leaks.
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 Figure 20.
10. Push the rubber drain hose over the riser drain stubout.
Be careful that you do not bend the drain stubout.
11. Adjust the hose clamp over the riser stubout and rubber
hose to hold in place as shown in Figure 20.
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. These valves
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
insulation must be pulled back into place over the joint
and glued or sealed to prevent sweating and heat loss
15
Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
