18
NOTE: The studs may be mechanically fastened to the 42SJ fan
coil. Care should be taken, however, not to penetrate the supply or
return water risers or internal piping. Given the levelness of the
floor and/or the fan coil assembly, some shimming may be
necessary.
e. Assemble the specified wall construction up to and over
the top of the fan coil unit (see Fig. 17).
f. With the fire-wall separation being complete, the drywall
skin on the surface of the individual fan coils can be
applied. Drywall can be applied directly to the surface,
or, if necessary, studding may be installed on the corners
for vertical control (see Fig. 17).
g. For ease of installation of the access panel, apply drywall
on the return-air side directly to the surface of the unit
(see Fig. 17). When applying the wall board directly to
the unit cabinet, it may be necessary to shim the wall
board in some areas to achieve the desired finished wall
surface.
h. After all drywalling and painting is complete, install
thermostats, supply air grilles and return air panels.
Fig. 17 — 42SJ Unit Installation
7. Attach unit risers:
NOTE: Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed
BEFORE beginning the connection and testing of risers and pip-
ing. The supply and return connections are marked on the coil
stub-outs and the valve package with an “S” meaning supply or in-
let and “R” meaning return or outlet indicating flow direction to
and from the coil. Blue letters mark the chilled water connections
and red letters mark the hot water connections.
a. Each riser has a 3 in. swaged portion at top and sufficient
extension at bottom for an inserted length of approxi-
mately 2 in. This unit-to-unit joint is NOT intended for
full bottoming in the joint, but allows for variations in
floor-to-floor dimensions and for correct riser position-
ing.
If job requires that unit risers be supplemented with
between-the-floor extensions, pieces may be field-sup-
plied or factory-supplied. If factory-supplied, insulation
is also provided.
b. Level unit to ensure proper coil operation and conden-
sate drainage. Proper riser installation and vertical posi-
tioning in the unit provides for a unit piping run-out to
the service valves, which are centered in the access slots
and level or sloping down slightly away from the riser.
This prevents condensation from running back to the
riser and possible damage from dripping at the bottom of
a riser column. Each job has specific requirements, and
satisfying those requirements is the responsibility of the
installer. After units are positioned and riser centered in
pipe chase, make unit plumb in two directions, using unit
frame as a reference.
c. Anchor unit to building. Use bolts or lag screws through
holes provided in unit frame.
d. After all units in a stack are anchored, make unit-to-unit
riser joints. First, center each coil-to-riser line within the
expansion slot in the unit back panel. Each riser joint
must be in vertical alignment with at least 1 in. penetra-
tion into the swaged joint. This condition is met if floor-
to-floor dimension is as specified and coil-to-riser lines
are properly centered. Wide variations in floor-to-floor
dimensions may necessitate cutting off or extending
individual risers. Such modifications are the full respon-
sibility of the installing contractor.
e. Before making the riser joints, the riser insulation must
be pulled back away from the joint and protected from
heat during the brazing process. The riser joint filler
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.
8. Anchor risers as required:
a. Do not fasten risers rigidly within each unit. Risers must
be free to move within pipe chase in response to normal
vertical expansion and contraction. The unit internal pip-
ing is designed to accommodate a total riser vertical
movement of ± 3/4 in., due to thermal expansion and/or
contraction, when positioned properly at the jobsite.
b. Built-in risers must be anchored at some point to build-
ing structure. Unit design accommodates up to 1-1/2 in.
expansion and contraction in riser assemblies when posi-
tioned properly at the job-site. Risers must be anchored
to the building structure to limit expansion and contrac-
tion movement to a maximum of 1-1/2 in. Riser anchor-
ing and expansion compensation is not included in the
factory-supplied unit and must be field-provided. While
some special riser features are available from the factory,
riser end caps, air vents, and/or flushing loops are nor-
mally provided on the job by the installer.
9. Test the system for leaks after the connections are completed.
When testing with air or some other gas, it might be neces-
sary to tighten stem packing nuts on some valves to maintain
CAUTION
Toxic residues and loose particles resulting from manufactur-
ing and field piping techniques such as joint compounds, sol-
dering flux, and metal shavings may be present in the unit and
the piping system. Special consideration must be given to sys-
tem cleanliness when connecting to solar, domestic or potable
water systems. Failure to heed this warning could result in
equipment damage.
Wall Studs
Install Wall
Gypsum
Board
(To Wall And
Over Top Of
Unit)
Install
Gypsum
Board To
Unit Sides
Install
Gypsum
Board To
Face Of
Unit With
Cut Outs
For Supply,
Return And
Thermostat
IMPORTANT: Chilled water and hot water risers should
never be piped to drain down into the condensate riser. Exten-
sive water damage can occur due to drain overflow. Drain
chilled and hot water risers to a remote location away from the
unit such as sink, room or floor drains.
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