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 notied
BEFORE any repairs are attempted. All leaks should be
repaired before proceeding with the installation.
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 or gain.
Internal chilled water piping and valves are located over the
drain pan and need not be insulated.
Any reproong requirements where risers or piping
penetrate oors or walls are the responsibility of the
installer. This work should be done only after all pressure
testing is completed. The reproong 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 prevent
sweating and must be protected from wear or erosion at the
joint between the insulation and the reproong material.
Before anchoring the equipment in place, the unit must be
leveled and the cabinet must be squared and brought into
line with any adjacent or included walls.
The unit may be anchored in place by bolting directly
through the unit oor 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 movement during construction
and riser expansion and contraction.
After anchoring the unit, it is then ready for the various
service connections such as riser joints and electrical. At this
time, it should be veried that the proper types of service are
actually provided to the unit. On those units requiring chilled
water and/or hot water, the proper main size and water
temperature should be available to the unit. The electrical
service to the unit should be compared to
the unit nameplate to verify compatibility. The routing and
sizing of all piping, and the type and sizing of all wiring
and other electrical components such as circuit breakers,
service switches, etc. should be determined by the individual
job requirements, and should not be based on the size
and/or type of connection provided on the equipment.
All installations should be made in compliance with all
governing codes and ordinances. Compliance with all
codes is the responsibility of the installing contractor.
Part 4 – Mega Mod Units (MGY)
The unique design of the Mega Modular Fan Coil unit allows
for eld conguration of each unit. Risers, shown with unit,
are for reference only. All risers are factory fabricated and
shipped loose for eld installation.
It is important that you identify all of the unit feature
locations before proceeding with the installation. Also, it
must be determined whether your application requires a
Mating Unit (primary/secondary) and its congurations.
Consult your local sales representative or the factory for
further details on primary/secondary arrangements.
Return Air
MGY 14-20
Cabinet
HR CRDHS CS
HR = Hot Water Return
HS = Hot Water Supply
D = Drain
CR = Cold Water Return
CS = Cold Water Supply
D
CR
HS
CS
HR
R = Return
D = Drain
S = Supply
R
D
S
2- or 4-pipe
RightLeft
Rear
Front
Figure 16
Unit orientation is determined based on the location of the
risers in the building. Risers can only be installed on the rear
side of the unit and it always determines the rear of the Mega
Mod unit. The return air is always on the front (see Figure 16).
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