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Modular Hi-Rise Series Fan Coils
CAUTION: Avoid penetrating the riser, coil,
piping and electrical system with sheetrock
screws.
Wall Studs
(E) Install
gypsum
board to face
of unit with
cut outs for
supply, return
and thermostat
Figure 15 – On-Site Installation
Part 3 – High Rise, Ditto, and Siamese Ditto (MPY, MAY/
MBY, MMY/MSY)
Supply, Return, and Drain Risers
CAUTION: Toxic residues and loose particles
resulting from manufacturing and field piping
techniques such as joint compounds,
soldering flux, and metal shavings may be present in the
unit and the piping system. Special consideration must
be given to system cleanliness when connecting to solar,
domestic or potable water systems.
Submittals and product literature detailing unit operation,
controls, and connections should be thoroughly reviewed
BEFORE beginning the connection and testing of risers and
piping.
The supply and return connections are marked on the coil
stub-outs and the valve package with an "S" meaning supply
or inlet 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.
The unit internal piping is designed to accommodate a total
riser vertical movement of ±3/4", due to thermal expansion
and/or contraction, when positioned properly at the job
(C) Install wall
site. Risers must be anchored to the building structure to
gypsum board
(To wall and
limit expansion and contraction movement to a maximum
over top of unit)
of 1-1/2". Riser anchoring 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
normally provided on the job by the installer.
Proper riser installation and vertical positioning in the unit
(D) Install gypsum
provides for a unit piping run-out to the service valves which
board to
unit sides
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.
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 floor-to-floor dimensions may
require field work such as cutting off or extending the risers.
This operation is the responsibility of the installer. 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.
Chilled water and hot water risers should never be piped
to drain down into the condensate riser. Extensive 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 and floor drains.
After the connections are completed, the system should then
be tested for leaks. 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
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