IEC Modular Hi-Rise Series Instruction manual

• Energy
Efficient
• Easy to
Install
• Extended
Service Life
• Energy ecient compact blower coils
• Ideal for educational, hospitality, multi-family, or other commercial environments
• Designed for ducted applications
• Nominal CFM range of 600 to 3,000 CFM
Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
Modular Hi-Rise Models:
MPY, MXY, MAY/MBY Ditto,
MMY/MSY, MUY, and MGY

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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
International Environmental Corporation (IEC) works continually
to improve its products. As a result, the design and specifications
of each product may be changed without notice and may not be
as described herein. Please contact IEC for information regarding
current design and product specifications. Statements and
other information contained herein are not express warranties
and do not form the basis of any bargain between the parties
but are merely IEC’s opinion or commendation of its products.
Manufacturer’s standard limited warranty applies.

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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
SECTION I – Receipt and Initial Installation
4 Receipt
4 Unpacking and Inspection
5 Handling and Installation
SECTION II – Product Line Specific Installation
5 Part 1 – Universal Hi-Rise Units (MUY)
6 Potential Unit Configurations
6 Unit Knockout Locations (Typical)
7 Supply, Return, and Drain Riser Installation
8 Riser to Unit Installation
8 Riser to Drain Installation
10 Supply Air Installation
10 Part 2 – Ditto and Siamese Ditto ( MAY/MBY)
12 Part 3 – High Rise, Ditto, and Siamese Ditto (MPY, MAY/
MBY, MMY/MSY)
12 Supply, Return, and Drain Risers
13 Part 4 – Mega Mod Units (MGY)
14 Supply, Return, and Drain Risers
14 Riser to Unit Installation
15 Riser to Drain Installation
16 Unit Knockout Locations (Typical)
16 Supply Air Installation
17 Demolition
18 Installation
SECTION III – Finishing Installation (All Models)
18 Grille/Ductwork Installation
18 Outside Air Installation (if required)
18 Electrical Connections
19 Exposed Unit Touch-up and Repainting
19 Concealed Unit Enclosure
SECTION IV – Start-up (All Models)
20 Operating Conditions
20 Cooling/Heating System
20 Air System Balancing
21 Control Board Adjustment
22 Water Treatment
22 Water System Balancing
23 Controls Operation
SECTION V – Routine Maintenance (All Models)
23 Motor/Blower Assembly
23 Coil
24 Electric Resistance Heater Assembly
24 Electrical Wiring and Controls
24 Valves and Piping
24 Filters, Throwaway
25 Filters, Permanent
25 Drain
25 Replacement Parts
SECTION VI – Checklists
25 Receiving and Inspection
25 Handling and Installation
25 Cooling/Heating Connections
25 Ductwork Connections
25 Electrical Connections
26 Unit Start-up
26 Terms and Conditions

SECTION I – Receipt and Initial Installation
Receipt
International Environmental Corporation fan coil units
represent a prudent investment oering trouble-free
operation and long service with proper installation,
operation, and regular maintenance.
Your equipment is initially protected under the
manufacturer’s standard warranty; however, this
warranty is provided under the condition that the steps
outlined in this manual for initial inspection, proper
installation, regular periodic maintenance, and everyday
operation of the equipment be followed in detail. This
manual should be fully reviewed in advance before initial
installation, start-up, and any maintenance. Should
any questions arise, please contact your local sales
representative or the factory BEFORE proceeding.
The equipment covered by this manual is available with a
variety of options and accessories. Consult the approved unit
submittals, order acknowledgement, and other manuals for
details on unit options and accessories.
NO ATTEMPT SHOULD BE MADE TO HANDLE, INSTALL,
OR SERVICE ANY UNIT WITHOUT FOLLOWING SAFE
PRACTICES REGARDING MECHANICAL EQUIPMENT.
The equipment must always be properly supported.
Temporary supports used during installation or service
must be adequate to hold the equipment securely.
All power must be disconnected before any installation
or service is attempted. More than one power source
may be supplied to a unit. Power to remote mounted
control devices may not be supplied through the unit.
Never wear bulky or loose tting clothing when working
on any mechanical equipment. Gloves should be worn
for proper protection against heat and other possible
injuries. Safety glasses or goggles should always be
worn when drilling, cutting, or working with chemicals
such as refrigerants or lubricants.
Never pressurize any equipment beyond specied test
pressures. Always pressure test with an inert uid or gas
such as clear water or dry nitrogen to avoid possible
damage or injury in the event of a leak or component
failure during testing.
Always protect adjacent ammable material when
welding or soldering. Use a suitable heat- shield
material to contain sparks or drops of solder. Have a re
extinguisher readily available.
The manufacturer assumes no responsibility for personal
injury or property damage resulting from improper or
unsafe practices during the handling, installation, service, or
operation of any equipment.
Unpacking and Inspection
All units are carefully inspected at the factory throughout
the manufacturing process under a strict detailed quality
assurance program, and, where possible, ALL major
components and sub-assemblies are carefully tested for
proper operation and veried for full compliance with factory
standards. Operational testing of some customer-furnished
components such as electronic control valves and digital
controllers may be a possible exception.
Each unit is carefully packaged for shipment to avoid damage
during normal transit and handling. Equipment should
always be stored in a dry place, and in the proper orientation
as marked on the carton.
All shipments are made F.O.B. factory and is the responsibility
of the receiving party to inspect the equipment upon arrival.
Any obvious damage to the carton and/or its contents should
be recorded on the bill of lading and a claim should be led
with the freight carrier.
After determining the condition of the carton exterior,
carefully remove each unit from the carton and inspect
for hidden damage. At this time, check to make sure that
“furnished only” items such as thermostats, grilles etc. are
accounted for whether packaged separately or shipped at
a later date. Any hidden damage should be recorded and
immediately reported to the carrier and a claim should be
led. In the event a claim for shipping damage is led, the
unit, shipping carton, and all packing must be retained for
physical inspection by the freight carrier. All equipment
should be stored in the factory shipping carton with internal
packing in place until installation.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

At the time of receipt, the equipment type and arrangement
should be veried against the order documents. Should
any discrepancy be found, the local sales representative
should be notied immediately so that proper action may
be taken. Should any questions arise concerning warranty
repairs, the factory must be notied BEFORE any corrective
action is taken. Where local repairs or alterations can be
accomplished, the factory must be fully informed of the
extent and expected cost of those repairs before work is
begun. Where factory operations are required, the factory
must be contacted for authorization to return equipment and
a Return Authorization Number will be issued. Unauthorized
return shipments of equipment and shipments not marked
with an authorization number will be refused. In addition,
any claims for unauthorized expenses will not be accepted by
the manufacturer.
Handling and Installation
The units covered in this manual are identied by a tag on
top of the unit which shows the oor and riser number for
which each unit is designed. Units should not be installed at
locations other than that marked on the unit identication
tag. If no specic detail is shown on tag for unit location
then determine conguration for the Universal unit based
on information within this IOM. Should any questions arise
regarding unit conguration, contact the sales representative
or the factory BEFORE proceeding.
While all equipment is designed and fabricated with sturdy
materials and may present a rugged appearance, great care
must be taken to assure that no force or pressure be applied
to the coil, risers, or piping during handling. Never use the
risers to lift the unit. Also, depending on the options and
accessories, some units could contain delicate components
that may be damaged by improper handling. Lifting or
supporting the cabinet only at the top and bottom should
be avoided to maintain the straight and square cabinet
alignment. The unit must be lowered into the space taking
care to properly align the risers to engage the riser swaged
sections on the unit below. The risers should never be bent
or pushed together to be passed through the oor slot and
should never be lifted up or pulled down to meet the risers
on the oor below or above. The risers are designed with a
three-inch swage to accommodate a two-inch overlap and
minor oor to oor variations.
The equipment covered in this manual IS NOT suitable
for outdoor installations. The equipment should never be
stored or installed where it may be subjected to a hostile
environment such as rain, snow, or extreme temperatures.
During and after installation, special care must be taken to
prevent foreign material such as paint, plaster, and drywall
dust from being deposited in the drain pan or on the motor
or blower wheels. Failure to do so may have serious adverse
eects on unit operation, and in the case of the motor and
blower assembly, may result in immediate or premature failure.
All manufacturer’s warranties are void if foreign material is
allowed to be deposited on the motor or blower wheels of any
unit. Some units and/or job conditions may require some form
of temporary covering during construction.
While the manufacturer does not become involved in the
design and selection of support methods and components,
it should be noted that unacceptable system operating
characteristics and/or performance may result from improper
or inadequate unit structural support. Due to variations in
building construction, oor plans, and unit congurations,
each installation is dierent. The actual step-by-step method
of installation may vary from unit to unit. However, the risers
should be moved as little as possible to avoid damage to the
unit and internal components.
On certain units, shipping screws or braces must be removed
after the unit is installed. Be sure to check all tags on the
unit to determine which, if any, of these devices need to be
removed.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

SECTION II – Product Line Specic Installation
Part 1 – Universal Hi-Rise Units (MUY)
The unique design of the Universal Modular Fan Coil unit
allows for eld conguration for each unit. Air discharge,
riser, drain, and outside air knockouts have been strategically
located on 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 and which knockouts you intend to use before
proceeding with the installation. Also, it must be determined
whether your application requires a Mating Unit (primary/
secondary) and its conguration. Consult your local sales
representative or the factory for further details on primary/
secondary arrangements.
Potential Unit Congurations
Risers: Three Locations–The pre-installed Supply, Return, and
Drain risers (2-pipe or 4-pipe applications) can be oriented on
any of three sides of the unit (see Figure 1).
NOTE: Risers can not be installed on the Return Air side of the
cabinet.
MUY
Cabinet
Return Air
HR CRDHS CS
HR CRDHS CS
HR CRDHS CS
DCR
HS CS
HR
RDS
HR = Hot Water Return
HS = Hot Water Supply
D = Drain
CR = Cold Water Return
CS = Cold Water Supply
R = Return
D = Drain
S = Supply
2- or 4-pipe
Figure 1
Unit orientation is determined based on the location of the
risers in the building. The riser side of the Universal Modular
unit always determines the rear of the unit (see Figure 2).
Return Air: Single Location–The Return Air/Access panel
may then be oriented on the left, right, or front of the unit.
Supply Air: Five Locations (4 sides and top) includes
stitched design for 1/2” duct anges.
Outside Air: Two Locations–Either side adjacent to the
Return Air opening.
NOTE: Outside Air opening may not be used on a side if risers are
configured on that same side.
Unit Knockout Locations (Typical)
Side Supply Air
Knockout
(1 per side)
Riser Knockouts
(4 per side,
except on
Return Air side)
Drain Knockout
(1 per side,
except on
Return Air side)
Outside Air
Knockout
(2 sides only,
adjacent to
Return Air
opening)
SIDE VIEW
Return
Air
Optional
Electrical
Knockouts
Figure 3A
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

Top Supply
Air Knockout
TOP VIEW
Electrical
Knockouts
Figure 3B
Knockout
Slot
Knockout
Tab
KNOCKOUTS:
Knockout
Knockout
Tab
Drain
Knockout
Supply and Return
Figure 4
Drain
Insulation
Cut Line
Supply and Return
Insulation Cutline
Figure 5
Supply, Return, and Drain Riser Installation
1. Three sides of each Universal Modular unit have four
Supply and Return riser knockouts along the center
and one Drain knockout near the lower part of the unit
(see Figure 3A). Identify whether your application uses a
2-pipe or 4-pipe conguration.
a. 2-pipe congurations: typically use the two inner
riser knockouts.
b. 4-pipe congurations: will use all four riser
knockouts.
2. Locate and mark the riser and drain knockouts that
apply to your particular unit application, insuring proper
orientation of the Return Air opening in room.
3. Insert a at head screw driver into knockout slot shown in
Figure 4.
4. Pry screw driver back and forth until knockout tabs break
away from the unit.
5. Discard knockout. Be careful of sharp edges.
6. Use a sharp retractable knife (see Figure 5) and vertically
cut the insulation down the center of the riser and drain
knockouts the full length of the knockout.
7. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
CAUTION: Toxic residues and loose particles
resulting from manufacturing and eld piping
techniques such as joint compounds, soldering
ux, 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.
To assure optimal unit performance, the supply connection(s)
are marked on the unit’s coil with an “S” meaning supply or
inlet and “R” meaning return or outlet indicating ow direction
to and from the coil. Blue letters mark the chilled water
connections and red letters mark the hot water connections.
The unit’s internal piping is designed to accommodate a total
riser vertical movement of ±1-1/2”, due to thermal expansion
and/or contraction, when positioned properly at the job site.
Risers must be anchored to the building structure to limit
expansion and contraction movement to a maximum of 3”.
Riser anchoring and expansion
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

compensation is not included in the unit and must be
provided. Riser end caps, air vents, and/or ushing loops
must be provided at the jobsite by the installer.
Proper eld riser installation and vertical positioning in the
unit should have a pipe run-out to the service valves which
are centered in the knockout access slots and that slope
down slightly away from the riser (see Figure 6). This prevents
condensation from running back to the riser and possible
damage from dripping at the bottom of a riser column.
Each job has specic requirements and satisfying those
requirements is the responsibility of the installer.
Riser to Unit Installation
Ball
Valve
Riser Stubout
Insulation
Threaded
Fitting
Unit insulation
Outer
Cabinet
Riser Knockout
Slot
Figure 6
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 oor-to-oor dimensions may
require eld work such as cutting o or extending the risers.
This operation is the responsibility of the installer. The riser
joint ller 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.
Flexible
Hose Kit
Riser
Ball
Valve
Riser Stubout
Insulation
Bae
Connection point to any factory
furnished and installed
components.
Coil
Figure 7
Back-up
Wrench
Ball
Valve Wrench
Swivel
Connection
Figure 8
Riser to Drain Installation
Drain Pan
Drain
Clamp
Clamp
Riser Knockout
Unit Insulation
P-Trap
Unit Wall
Riser
Riser Stubout
Figure 9
1. After the applicable Supply, Return, and Drain knockouts
have been removed, carefully position the unit so that
the riser ball valves penetrate into the unit through the
riser knockouts making sure the insulation penetrates
into the unit as shown in Figures 6, 7, and 9.
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Modular Hi-Rise Series Fan Coils
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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 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 connections and
electrical.
3. The plastic are caps on the end of the riser ball valves
should be removed and discarded.
4. All Universal Modular units use reinforced braided
stainless steel exible hose kits for piping between eld
installed risers and unit water coils as shown in Figure 7.
The hose kit design has threaded connections on each
end. The hose kits allow for riser uctuations 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 8. 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 tting.
7. The plastic are caps on the end of the coil tting should
be removed and discarded.
8. Use a wrench to tighten the swivel connections. The
bae 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 9.
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 9.
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
ushing debris into the unit 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 notied 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 or
gain. All of the risers including the riser stubouts should
be properly covered with insulation. Internally mounted
chilled water piping and valves are located over the drain
pan and need not be insulated.
Any reproong 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 reproong 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 reproong material.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

When no risers are ordered for the Universal Modular unit,
it is the responsibility of the installer to make sure that an
isolation ball valve is installed between each supply and
return piping connection to the unit. Flare ttings are factory
provided to allow connection between the ball valves and
the hoses.
Supply Air Installation
Knockout Tab
(10 places)
Duct Break
(4 places)
Knockout Tab
Trim Line
Figure 10
1. Each side of the unit has one supply air knockout as
well as a supply air knockout on the top of the unit (see
Figures 3A and 3B).
2. Determine which supply air opening/openings are
required for your application.
NOTE: The supply air opening on the riser side of the unit
should not be used.
3. Use a sharp retractable knife to trim insulation using
center knockout slot/trim line as pattern (see Figure10).
4. Use a sharp standard needle nose pliers and grab
knockout tab (see Figure 10).
5. Twist or pry pliers back and forth until knockout tab
breaks away from unit.
6. Repeat for all supply air tabs until all have been broken.
7. Discard center knockout piece. Be careful of sharp edges.
8. Use a sharp retractable knife to trim any excess
insulation using knockout hole as pattern.
Unit
Wall
Unit
Insulation
90°
Duct Flange
Figure 11
9. Use duct pliers (hand seamers) to fold duct ange out of
the unit 90˚ for each side of the supply air opening along
duct break (see Figure 10). The 90˚ anges can now be
used as drywall stops to prevent coverage of discharge
opening (see Figure 11).
10. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
11. For ducted applications tape should be applied along
and around all of the supply air opening knockouts to
prevent air leakage.
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 2 – Ditto and Siamese Ditto ( MAY/MBY)
The Ditto and Siamese Ditto Modular Hi-Rise Fan Coils have
been designed to serve two separate rooms. These products
are classied by Underwriters Laboratories Inc. for use in
Penetration Firestop Systems. Control Number 27WL. They
carry a one-hour rating. See UL Fire Resistance Directory for
more information.
10
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

MBY
MAY
Figure 12 – Ditto
MBY
MAY
Figure 13 – Siamese Ditto
The control lines for the drywall track and studs should be
laid out in the oor and ceiling (A) (see Figure 14).
Tracking may be installed now or after the unit is set.
Position the Ditto or Siamese Ditto fan coil assembly
between two rooms with the unit drywall separation spotted
over the wall control lines.
If not already installed, install the oor and ceiling tracks up
to and over the Ditto or Siamese Ditto Fan Coil unit.
Next, position the vertical studs and fasten into each of
the stud pockets formed into the chase side panels (B) (see
Figure 14).
(B) Install wall
stud into
pocket
formed by
chase side
panel
Chase Side Panel
(A) Drywall Track
and Stud
Control Lines
Install studs from top of unit to ceiling (4 corners)
Figure 14 – Unit As Shipped
The studs may be mechanically fastened to the Ditto or
Siamese Ditto Fan Coil. Care should be taken, however, not to
penetrate the supply or return water risers or internal piping.
Given the levelness of the oor and/or the fan coil assembly,
some shimming may be necessary.
Assemble the specied wall construction up to and over the
top of the fan coil unit (C) (see Figure 15).
With the re-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
(D) (see Figure 15).
For ease of installation of the access panel, apply drywall on
the return air side directly to the surface of the unit (E) (see
Figure 15). 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 nished wall surface.
After all drywalling and painting is complete, install
thermostats, supply air grilles and return air panels.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

CAUTION: Avoid penetrating the riser, coil,
piping and electrical system with sheetrock
screws.
Wall Studs
(C) Install wall
gypsum board
(To wall and
over top of unit)
(D) Install gypsum
board to
unit sides
(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 eld piping
techniques such as joint compounds,
soldering ux, 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 ow
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
site. Risers must be anchored to the building structure to
limit expansion and contraction movement to a maximum
of 1-1/2”. Riser anchoring and expansion compensation is
not included in the factory-supplied unit and must be eld
provided. While some special riser features are available from
the factory, riser end caps, air vents, and/or ushing loops are
normally provided on the job by the installer.
Proper riser installation and vertical positioning 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
specic 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 oor-to-oor dimensions may
require eld work such as cutting o or extending the risers.
This operation is the responsibility of the installer. The riser
joint ller 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 overow. Drain chilled and
hot water risers to a remote location away from the unit such
as sink, room and oor 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 ushing debris into the unit
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Modular Hi-Rise Series Fan Coils
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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 notied
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 reproong 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 reproong 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 reproong 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 veried 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 conguration 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 congurations.
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
DCR
HS CS
HR
R = Return
D = Drain
S = Supply
RDS
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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Modular Hi-Rise Series Fan Coils
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Supply, Return, and Drain Risers
CAUTION: Toxic residues and loose particles
resulting from manufacturing and eld piping
techniques such as joint compounds, soldering
ux, 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 depending on your
conguration.“CS”means cold water supply, “CR” means cold
water return,“HS” means hot water supply, and “HR” means
hot water return to indicate ow 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 ±1-1/2”, due to thermal expansion
and/or contraction, when positioned properly at the job site.
Risers must be anchored to the building structure to limit
riser expansion and contraction movement to a maximum
of 3”. Riser anchoring and expansion compensation is not
included in the factory-supplied unit and must be eld
provided. While some special riser features are available from
the factory, riser end caps, air vents, and/or ushing loops are
normally provided on the job by the installer.
Proper riser installation and vertical positioning 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
specic requirements and satisfying those requirements is
the responsibility of the installer.
Riser to Unit Installation
Ball
Valve
Riser Stubout
Insulation
Threaded
Fitting
Unit insulation
Outer
Cabinet
Riser Knockout
Slot
Figure 17
Flexible
Hose Kit
Riser
Ball
Valve
Riser Stubout
Insulation
Bae
Connection point to any factory
furnished and installed
components.
Coil
Figure 18
Back-up
Wrench
Ball
Valve Wrench
Swivel
Connection
Figure 19
14
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

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 oor 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 are caps on the end of the riser ball valves
should be removed and discarded.
4. All Mega Modular units use reinforced braided stainless
steel exible hose kits for piping between eld 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 uctuations 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 tting.
7. The plastic are caps on the end of the coil tting should
be removed and discarded.
8. Use a wrench to tighten the swivel connections. The
bae 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
ushing 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 notied 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
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

or gain. All of the risers including the riser stubouts should
be properly covered with insulation. Internally mounted
chilled water piping and valves are located over the drain
pan and need not be insulated.
Any reproong 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 reproong 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 reproong material.
When no risers are ordered for the Mega Modular unit, it is
the responsibility of the installer to make sure that a eld
supplied isolation ball valve is installed between each supply
and return piping connection to the unit. Flare ttings are
factory provided to allow connection between the ball valves
and the hoses.
Variations in oor-to-oor dimensions may require eld work
such as cutting o or extending the risers. This operation is
the responsibility of the installer. The riser joint ller 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 overow. Drain chilled and
hot water risers to a remote location away from the unit such
as sink, room and oor drains.
All installations should be made in compliance with all
governing codes and ordinances. Compliance with all
codes is the responsibility of the installing contractor.
Unit Knockout Locations (Typical)
Side Supply Air
Knockout
(1 per side)
SIDE VIEW
Mega Mod
Cabinet
Optional
Supply
Plenum
Figure 21
Top Supply
Air Knockout
TOP VIEW
Electrical
Knockouts
Figure 22
Supply Air Installation
Knockout Tab
(10 places)
Duct Break
(4 places)
Knockout Tab
Trim Line
Figure 23
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Modular Hi-Rise Series Fan Coils
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1. If the unit has been ordered with a supply air plenum,
then each side of the unit has one supply air knockout as
well as a supply air knockout on the top of the unit (see
Figures 21 and 22).
2. Determine which supply air opening/openings are
required for your application.
NOTE: The supply air opening on the riser side of the unit
should not be used.
3. Use a sharp retractable knife to trim insulation using
center knockout slot/trim line as pattern (see Figure23).
4. Use a sharp standard needle nose pliers and grab
knockout tab (see Figure 23).
5. Twist or pry pliers back and forth until knockout tab
breaks away from unit.
6. Repeat for all supply air tabs until all have been broken.
7. Discard center knockout piece. Be careful of sharp edges.
8. Use a sharp retractable knife to trim any excess
insulation using knockout hole as pattern.
Unit
Wall
Unit
Insulation
90º
Duct Flange
Figure 24
9. Use duct pliers (hand seamers) to fold duct ange out of
the unit 90˚ for each side of the supply air opening along
duct break (see Figure 23). The 90˚ anges can now be
used as drywall stops to prevent coverage of discharge
opening (see Figure 24).
10. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
11. For ducted applications tape should be applied along
and around all of the supply air opening knockouts to
prevent air leakage.
SECTION III – Finishing Installation (All
Models)
Grille/Ductwork Installation
All ductwork and/or supply and return grilles should
be installed in accordance with the project plans and
specications. If not included on the unit or furnished from
the factory, supply and return grilles should be provided as
recommended in the product catalog.
Outside Air Installation (if required)
Units provided with outside air for ventilation should have
some form of low-temperature protection to prevent coil
freeze-up. This protection may be any of several methods
such as a low-temperature thermostat to close the outside air
damper or a preheat coil to temper the outside air before it
reaches the unit.
It should be noted that none of these methods will
adequately protect a coil in the event of power failure.
The safest method of freeze protection is to use glycol in
the proper percent solution for the coldest expected air
temperature.
The manufacturer assumes no responsibility for
undesirable system operation due to improper system
design, equipment or component selection, and/or
installation of ductwork, grilles, and other related
components.
Electrical Connections
The unit serial plate lists the unit electrical characteristics
such as the required supply voltage, fan and heater
amperage and required circuit ampacities. The unit wiring
diagram shows all unit and eld wiring. Since each project
is dierent and each unit on a project may be dierent, the
installer must be familiar with the wiring diagram and serial
plate on the unit BEFORE beginning any wiring.
The unit electrical supply is designed to enter through
knockouts provided in the top of the unit and pass down
through matching knockouts in the control section top.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

Where space allows, power may be pulled directly through
the side of the cabinet into the control section.
All components furnished for eld installation by either the
factory or the controls contractor should be located and
checked for proper function and compatibility. All internal
components should be checked for shipping damage, and
any loose connections should be tightened to minimize
problems during start-up.
Any devices such as fan switches or thermostats that have
been furnished from the factory for eld installation must
be wired in strict accordance with the wiring diagram
that appears on the unit. Failure to do so could result in
personal injury or damage to components, and will void all
manufacturer’s warranties.
The fan motor should never be controlled by any wiring
or device other than the factory-furnished switchor
thermostat/switch combination without factory authori-
zation. Fan motor(s) may be temporarily wired for use
during construction only with prior factory approval in strict
accordance with the instructions issued at that time.
All eld wiring should be done in accordance with governing
codes and ordinances. Any modication of the unit wiring
without factory authorization will void all of the factory
warranties and will nullify any agency listings.
The manufacturer assumes no responsibility for any damages
and/or injuries resulting from improper eld installation and/
or wiring.
Exposed Unit Touch-up and Repainting
Return access and exposed cabinet units may be furnished
with a baked enamel nish. Small scratches in this nish may
be repaired with touch-up paint available from the factory.
Some colors of touch-up paint are available in aerosol
containers and all touch-up paint is available in pint, quart,
and gallon cans. Contact the factory for availability.
Proper safety procedures should be followed regarding
ventilation and safety equipment. The manufacturer’s
directions should be followed for the products being used.
To repaint the factory-baked enamel, the nish should
be prepared by light sanding with #280 grit sand paper
or #000 or #0000 ne steel wool. The surface may also be
wiped with a liquid surface etch cleaning product such as
“No Sand” or “Pasceo.”These items should be available at
most paint product stores. It should be noted that the more
conscientiously this preparation is done, the more eective it
will be.
After this preparation is accomplished, the factory nish
should provide excellent adhesion for a variety of air-dried
top coats. Enamel will give a more durable, higher gloss
nish, while latex will not adhere as well and will give a dull,
softer nish. Top coats involving an exothermic chemical
process between two components, such as epoxies and
urethanes, should be avoided.
Factory aerosol touch-up paint may require a number of light
“dust coats”to isolate the factory-baked enamel nish from
the quick drying touch-up paint.
Concealed Unit Enclosure
Concealed units are designed to have gypsum board or
other types of wall board applied directly to the unit cabinet
surface to a maximum combined thickness of 5/8-inch. The
wall board may be attached with drywall screws or similar
fasteners provided they penetrate the cabinet no more
than 1/2 an inch. These fasteners must be located to avoid
damage to internal components and wiring in the same
manner as the anchoring fasteners. 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
nished wall surface.
An alternate method of enclosing the unit is to frame one
or more sides with studding and apply the wall board to
this framing. This method requires specic unit features and
return access panels when used on the return-air side of a
unit. Units not properly equipped will exhibit poor cooling
and/or heating performance and could experience excessive
or premature component failures.
Contact the sales representative or the factory with any
questions regarding unit enclosure methods.
18
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

SECTION IV – Start-up (All Models)
Before beginning any start-up operation, the start-up
personnel should familiarize themselves with the unit,
options and accessories, and control sequence to understand
the proper system operation. All personnel should have a
good working knowledge of general start-up procedures and
have the appropriate start-up and balancing guides available
for consultation.
The building must be completely nished including doors,
windows, and insulation. All internal walls and doors should
be in place and in the normal position. In some cases the
interior decorations and furniture may inuence overall
system performance. The entire building should be as
complete as possible before beginning any system balancing.
The initial step in any start-up operation should be a nal
visual inspection. All equipment, plenums, duct-work, and
piping should be inspected to verify that all systems are
complete and properly installed and mounted, and that no
debris or foreign articles such as paper or drink cans are left
in the units or other areas.
Each unit should be checked for loose wires, free blower
wheel operation, and loose or missing access panels or doors.
Except as required during start-up and balancing operations,
no fan coil units should be operated without all the proper
ductwork attached, supply and return grilles in place, and all
access doors and panels in place and secure. A clean lter of
the proper size and type must also be installed. Failure to do
so could result in damage to the equipment or building and
furnishings and/or void all manufacturer’s warranties.
Cooling/Heating System
Prior to the water system start-up and balancing, the chilled/
hot water systems should be ushed to clean out dirt and
debris which may have collected in the piping during
construction. During this procedure, the system should be
ushed from the supply riser to the return riser through a
cross-over loop at the end of the riser column, and all unit
service valves must be in the closed position. This prevents
foreign matter from entering the unit and clogging the
valves and metering devices. Strainers should be installed in
the piping mains to prevent this material from entering the
units during normal operation.
During system lling, air venting from the unit is
accomplished by the use of the standard, manual air vent
tting, or the optional, automatic air vent tting installed
on the coil. Venting can be accomplished by depressing the
needle valve core. Automatic air vents may be unscrewed
one turn counterclockwise to speed initial venting, but
should be screwed in for automatic venting after start-up
operations.
CAUTION: The air vent provided on the unit is
not intended to replace the main system air
vents and may not release air trapped in other
parts of the system. Inspect the entire system for
potential air traps and vent those areas as required,
independently. In addition, some systems may require
repeated venting over a period of time to properly
eliminate air from the system.
Air System Balancing
All duct stubs, grilles, lters, and return-access panels must
be properly installed to establish actual system operating
conditions BEFORE beginning air balancing operations.
Each individual unit and the attached ductwork is a unique
system with its own operating characteristics. For this reason,
air balancing is normally done by balance specialists who are
familiar with all procedures required to properly establish
air distribution and fan-system operating conditions.
These procedures should not be attempted by unqualied
personnel.
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL

Units with no ductwork have air volumes predetermined at
the factory by supply grille size and normally do not require
air balancing other than selecting the desired fan speed.
Units furnished with optional dampers on supply grilles may
require some small adjustments to “ne tune”the air delivery
to each grille. Opposed blade balancing dampers are not
available for all grilles on a unit with electric heat.
After proper system operation is established, the actual unit
air delivery and the actual fan motor amperage draw for
each unit should be recorded in a convenient place for future
reference.
Control Board Adjustment.
Adjusting the Low, Medium and High potentiometer
requires the use of Multi-meter capable of measuring
0~10 VDC.
CAUTION: Only trained and qualied
individuals should attempt to adjust or service
components on any energized electrical equipment.
Failure to follow established safety rules and guidelines
could result in serious injury or death.
When unit is shipped from the factory with motor control
board (which has Hi, Med and Low airow settings), it is pre-
programmed at the factory to “High” speed and delivers the
airow and cooling/heating capacity specied at the time
of order, while Medium and Low Speeds are set to defaults
based on High speed. Should airow require adjustment
after installation, the control board settings for Low, Medium
and High could be adjusted by turning screws(as shown in
the picture) using a small Phillips Screwdriver. It will adjust
the control voltage to the motor. A clockwise rotation
increases the voltage to the motor, while counter clockwise
rotation reduces it.
CAUTION: Both of the procedures described
below require the control box to be powered
while adjustments are made. Line voltage
components are concealed behind a
secondary cover. However, installer should still take all
reasonable precautions.
Unit must be powered to perform the following procedure.
Set the electrical multimeter to VDC (Volts Direct Current).
Attach black negative (-) lead of meter to the terminal
labeled “L2” (shown above the potentiometers).
Attach the RED positive (+) lead of the meter to the terminal
labeled “L1” and conrm that there is approximately 5~10
VDC present.
Attach the RED positive (+) lead of the meter to the DC OUT-
PUTS. LOW, MED & HIGH are typically connected together.
1. Close either the LOW, MED & HIGH speed relay contacts
by applying 24 VAC to the corresponding LOW, MED or
HIGH 24 VAC INPUT and COM.
2. Measure voltage at the DC OUTPUTS and adjust the
potentiometer for that speed. (VR1 LOW, VR2 MED, VR3
HIGH)
3. In order to achieve higher CFM, turn the potentiometer
Clock-Wise .
NOTE: For specic voltages adjustment please contact IEC
factory representative.
Potentiometer
Low, Med, High CFM adjust
20
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Modular Hi-Rise Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL