16
UNT-SVX041D-EN
Installation - Mechanical
Installation of the fan coil units should begin on the lowest
floor and progress upward—floor-by-floor—to the top. Tip
the unit over the riser hole in the building floor. As the unit
is righted, align the risers with the unit below. Field-
furnished isolator pads or shims, if required, should be
positioned beneath the unit at this time.
Unit Handings
All unit handings for pipe connections and supply air
grilles are described relative to the front of the unit, where
the front of the unit is defined as the side where the return
air/access panel is located.
Positioning and Fastening
Wide variations in floor-to-floor dimensions may
necessitate cutting off or extending individual risers. Such
modifications are the full responsibility of the installing
contractor.
Supplied with each riser is a 3-inch swaged portion on the
top and sufficient extension at the bottom for an inserted
length of approximately 2 inches. This unit-to-unit joint is
not intended for full bottoming in the joint. This allows for
variations in floor-to-floor dimensions and for correct riser
positioning.
Some applications require that the risers be
supplemented with “between-the-floor” extensions.
These pieces should be assembled into position at this
time. “Between-the-floor” extensions are field supplied.
Once the units are positioned, with the risers centered in
the pipe chase, each unit should be positioned perfectly
vertical (plumb) in two planes and anchored to the building
structure.
It is imperative that the unit be properly leveled to assure
condensate drainage and proper coil operation. Once all
units are anchored, unit-to-unit riser joints may be made
as follows:
•
Each branch run-out in the coil section must be
centered, in the expansion slot, on the side or back
panel, before joining riser.
•
Each riser joint must be vertically aligned, with a
minimum 1-inch penetration (although 2 inches is
preferable and allowed for), into each swaged joint.
This condition will be met if floor-to-floor dimensions
are as specified and each branch run out is properly
centered. Riser joints must be made with phos-copper,
silfos, or other high-temperature alloys. Soft solders
(50-50, 60-40, and 85-15) or other low-temperature lead
alloys are
NOT
suitable for this application.
Flushing and Testing
•
If selected, the fan coil is equipped with ball valve type
shutoff valves. Refer UNT-PRC028*-EN to confirm if
valves are to be factory or field supplied.
•
After checking mechanical fittings inside the unit for
tightness, it is recommended that the units on each
riser stack are pressure tested using compressed air.
Check for audible air leaks.
•
Close the ball valves and flush the riser system.
NOTICE
Equipment Damage!
Failure to allow for expansion and contraction could
cause water leaks and result in equipment damage. Do
not rigidly fasten the risers to the unit. Risers must be
free to move within the pipe chase with normal vertical
expansion and contraction movements.
NOTICE
Coil Damage!
Failure to follow instructions below could result in
equipment damage. Condensate must flow freely from
the coil at all times to prevent coil damage from water
hammer, unequal thermal stresses, freeze-up and/or
corrosion.
NOTICE
Equipment Damage!
Failure to follow instructions below could result in
distortion of equipment. Ensure the horizontal run-out
from each riser is centered in the cabinet slot and at 90
degrees as it enters the cabinet prior to soldering the
risers.
NOTICE
Excessive Pressure!
Do not exceed 300 psig, or that which the supplied
components were designed. Sustained pressures in
excess of 300 psig could cause leaks and result in
equipment damage.
NOTICE
Equipment Damage!
Failure to follow these instructions could result in
equipment damage. All field-supplied and installed
riser insulation must have a vapor barrier cover or be
closed-cell foam insulation. Properly seal all joints
(with tape or glue) so no air can pass through to the
cold riser pipe.
