Superior REX RAH Series User manual

RAHC
RAHO
RAHR
www.superiorrex.com
RAH Installation Manual
FAN COIL UNITS FREE RETURN
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Safety Symbols.................................................................................................................................. 3
Safety Precautions ............................................................................................................................ 3
Code Compliance............................................................................................................................. 4
Receipt And Initial Installation........................................................................................................... 4
Unpacking & Inspection..................................................................................................................... 4
Handling & Installation....................................................................................................................... 5
Drain Pan........................................................................................................................................... 5
Auxiliary Drain Pans .......................................................................................................................... 5
Return Air Location........................................................................................................................... 6
Fan Removal .................................................................................................................................... 6
Plenum Box Service Panel............................................................................................................... 6
Plenum Box Removal....................................................................................................................... 7
Coil Handing..................................................................................................................................... 7
Coils.................................................................................................................................................. 7
Piping Connections............................................................................................................................ 7
Ductwork Connections...................................................................................................................... 7
Electrical Connections....................................................................................................................... 8
Control Enclosure.............................................................................................................................. 8
Telescoping Bottom Panel................................................................................................................ 8
Start-Up. ............................................................................................................................................ 8
Cooling/Heating System.................................................................................................................... 9
Motor & Fan Data .............................................................................................................................. 9
Ari Standard Ratings ....................................................................................................................... 10
Air System Balancing .......................................................................................................................11
Water System Balancing ..................................................................................................................11
Controls Operation ...........................................................................................................................11
Physical Data....................................................................................................................................11
Motor/Blower Assembly. ...................................................................................................................11
Fan Assembly.................................................................................................................................. 12
Coil ................................................................................................................................................ 12
Electric Resistance Heater Assembly.............................................................................................. 13
Electrical Wiring & Controls............................................................................................................. 13
Unit Weight Data ............................................................................................................................ 13
Electric Heat Selection Chart (Amps).............................................................................................. 14
Valves & Piping................................................................................................................................ 15
Drain................................................................................................................................................ 15
Filters............................................................................................................................................... 15
Filter Replacement ......................................................................................................................... 15
Face Area, Free Area And Filter Sizes ............................................................................................ 15
Replacement Parts.......................................................................................................................... 16
Model RAHO Free Return Dimensions ........................................................................................... 17
Model RAHO Free Return Unit Specific Dimensions ...................................................................... 18
Model RAHR Plenum Return Dimensions....................................................................................... 19
Model RAHR Plenum Return Unit Specific Dimensions.................................................................. 20
RAHC Exposed Cabinet Units......................................................................................................... 21
RAHR-M With Mixing Box. .............................................................................................................. 22
RAH Telescoping / Filter And Solid bottom Access Panels ............................................................. 22
RAH Series Coil Connection Sizes.................................................................................................. 23
Inspection & Start-Up Checklist....................................................................................................... 24
Table of Contents

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SAFETY SYMBOLS
note
caution
warning
danger
indicates an imminently hazardous situation which, if not avoided,
will result in death or serious injury
indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury
identifies a hazard which could lead to damage to the machine,
damage to other equipment and or environmental pollution. Usually
an instruction will be given, together with a brief explanation
is used to highlight additional information which may be helpful to
you
The equipment covered by this manual is designed for safe and reliable
operation when installed, operated, and maintained within its’ design
specications. To avoid personal injury or damage to equipment or
property during installation, operation, and maintenance of this equipment,
it is essential that these functions be performed by qualied, experienced
personnel using good judgment and safe practices. See the following
cautionary statements.
danger
ELECTRICAL SHOCK HAZARDS. All power must be
disconnected prior to installation and servicing of this
equipment. More than one power source may be present.
Disconnect all power sources to avoid electrocution or shock
injuries.
danger
MOVING PARTS HAZARDS. Power must be disconnected
from the motor and blower prior to opening access panels.
Motors can start automatically,and more than one power
source maybe present. Disconnect all power and control
circuits prior to servicing to avoid serious crushing or
dismembering injuries
danger
HOT PARTS HAZARDS. Hot water and steam heating coils
operate at temperatures that will cause severe burn injury.
Some systems will continue to allow circulation of hot water,
even with all control circuits deenergized. Before performing
service at or near any heating coil, piping, or valve package
component, disconnect all power and close all isolation
valves, and allow the equipment to cool. As previously
mentioned, more than one power source may be present.
danger
Electric resistance heating elements may start automatically.
Disconnect all power and control circuits, and allow the
elements to cool before servicing. Again, more than one
power source may be present.
danger
Check that the unit assembly and component weights can
be safely supported by rigging and lifting equipment.
warning
All assemblies must be adequately secured during lifting
and rigging by temporary supports and restraints until
equipment is permanently fastened and set in its nal
location.
warning
All unit temporary and permanent supports must be capable
of safely supporting the equipment’s weight and any
additional live or dead loads that may be encountered. All
supports must be designed to meet applicable local codes
and ordinances.
warning
All fastening devices must be designed to mechanically lock
the assembly in place without the capability of loosening or
breaking away due to system operation and vibration.
caution
Secure all dampers when servicing damper, actuator or
linkages. Dampers may activate automatically, disconnect
control circuits to avoid injury.
caution
Protect adjacent ammable materials when brazing, Use
ame and heat protection barriers where needed. Have re
extinguisher available and ready for immediate use.
caution
Never wear bulky or loose tting clothing when working on
any mechanical equipment. Gloves should only be worn
when required for proper protection from heat or other
possible injury. Safety glasses or goggles should always be
worn when drilling, cutting,or working with chemicals such
as refrigerants or lubricants.
caution
Never pressurize any equipment beyond specied test
pressures. Always pressure test with some uid or inert gas
such as clear water or dry nitrogen on refrigeration systems
to avoid possible damage or injury in the event of a leak or
component failure during testing.
caution
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.
The following symbols are used in this document to alert the reader to areas of potential hazard:

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CODE COMPLIANCE
This equipment has been manufactured and certied in accordance with
UL 1995-Standard for Safety, Heating and Cooling Equipment (CAN/CSA
C22.2 NO 236- M90) and bears the Electrical Testing Laboratories (ETL)
Mark under ETL File No: 3036742-002.
RECEIPT AND INITIAL INSTALLATION
warning
NO ATTEMPT SHOULD BE MADE TO HANDLE, INSTALL,
OR SERVICE ANY UNIT WITHOUT FOLLOWING SAFE
PRACTICES REGARDING MECHANICAL EQUIPMENT.
• All power must be disconnected before any installation or service
should be 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 only be
worn when required for proper protection from heat or other possible
injury. 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 operating
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 suitable heat shield material to contain sparks or drops of solder.
Have re extinguisher available for use when welding or brazing.
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 & 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 subassemblies are carefully tested
for proper operation and veried to be in full compliance with the factory
manufacturing documents. Customer furnished components such as
control valves, switches and DDC controls are not factory tested.
Each unit is carefully packaged for shipment to avoid damage during
normal transport and handling. The equipment should always be stored in
a dry place in the proper orientation as marked on the carton.
All shipments are made F.O.B. factory and it 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 switches, thermostats,
etc. are accounted for. Any hidden damage should be recorded and
immediately reported to the carrier and a claim led as before. 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.
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 the
proper action may be instituted. Should any question 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 as to 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, the manufacturer will not accept any
claims for unauthorized expenses

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HANDLING & INSTALLATION
While all equipment is designed for durability and fabricated for sturdy
construction and may present a rugged appearance, great care must be
taken to assure that no force or pressure be applied to the coil, piping
or drain stub-outs during handling. Also, depending on the options and
accessories, some units could contain delicate components that may be
damaged by improper handling. Wherever possible, all units should be
maintained in an upright position and handled by the chassis as close as
possible to the mounting point locations.
In the case of a full cabinet unit, the unit must obviously be handled by the
exterior casing. This is acceptable providing the unit is again maintained
in an upright position and no impact forces are applied that may damage
internal components, access panels, or painted surfaces. The equipment
covered in this manual IS NOT suitable for outdoor installations or
hazardous/explosive environments. The equipment should never be
stored or installed where it may be subjected to a hostile environment
such as rain, snow, extreme temperatures or corrosive or chemical laden
atmospheres.
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 effects on unit operation and in the case of the
motor and blower assembly, may result in immediate or premature failure.
All manufacturers’ 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 might
result from improper or inadequate unit structural support. In addition,
adequate clearance must be provided for service and removal of the
equipment and its accessory components. Anchoring the equipment
in place is accomplished by using the mounting points provided and
positioning the unit to maintain the unit on a LEVEL plane. All units are
supplied with hanging holes for use with all thread rods.
DRAIN PAN
The optional sloped, insulated drain pan can be equipped with a secondary
drain connection. Standard drain pans are externally insulated, single wall
galvanized steel. The drain pan is easily removable for cleaning. The pan
can be turned around 180 degrees for drainage on the opposite side of
the valve package(s) while capturing condensate from both the coil and
the valve package(s). The optional auxiliary drip pan to catch condensed
moisture from valves and piping is easily attachable to the drain pan. The
drain pan is equipped with external slots and is to be sloped toward the
outlet connection prior to start-up. Care must be taken to insure that the
unit drain pan does not slope away from the outlet connection.
AUXILIARY DRAIN PANS
The auxiliary drain pan mounts directly to the unit drain pan using (2) #10
x 1/2” screws.
After the connections are completed, the system should then be tested for
leaks. Since some components are not designed to hold pressure with a
gas, hydronic systems should be tested with water.

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caution
All water coils must be protected from freezing after initial
lling with water. Even if the system is drained, unit coils
may still hold enough water to cause damage when exposed
to temperatures below freezing.
Refrigerant systems should be tested with dry nitrogen rather than air
to prevent the introduction of moisture into the system. 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 piping should be insulated
in accordance with the project specications. ALL chilled water piping and
valves or refrigerant suction piping not located over drain pans must be
insulated to prevent damage from sweating. This includes factory and
eld piping inside the unit cabinet.
The drain should always be connected and piped to an acceptable disposal
point. For proper moisture carry-off, the drain piping should be sloped
away from the unit at least 1/8” per foot. A drain trap may be required by
local codes and it is strongly recommended for odor containment.
CONDENSATE TRAP
Trap detail for positive cabinet static pressure
RETURN AIR LOCATION
This unit is equipped with a eld reversible rear or bottom ducted air
return for plenum style units. To change the return air location, remove the
reversible plenum box panel and the lter rack. Rotate both the reversible
panel and lter rack 180 degrees. Replace the reversible panel in the
old lter rack position and fasten using the supplied screws. Fasten the
lter rack to the location where the reversible panel was and replace the
lter(s) as described above.
“H” MUST BE AT LEAST
1 INCH PLUS CASING
ST
ATIC PRESSURE
H
X
“X” MUST BE
AT
LEAST 1 INCH
BOTTOM RETURN
REAR RETURN
FAN REMOVAL
This fan assembly is easily removable by unscrewing the (4) E-20 nuts
from the fan deck and sliding the fan assembly off of the weld studs.
Disconnect motor wiring. Reassemble fans and torque nuts to 30 in/lbs.
PLENUM BOX SERVICE PANEL
The service panel on the plenum box is easily removable by removing the
screws located on the sides and bottom of the service panel.

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PLENUM BOX REMOVAL
In most cases this unit is fully serviceable without the need for removal of
the plenum box. However should the need arise, the plenum box is easily
removable by removing the screws attaching the plenum box to the sides,
top and rear of the coil casing.
COIL HANDING
This unit features a eld reversible coil assembly should the need arise
upon installation to change the handing of the coil. To change the coil
handing, remove the plenum box (if applicable) from the coil by removing
all screws to the coil casing. Next, remove the fan(s), fan deck, and top
and bottom casings from the coil. Replace the bottom coil casing in the
top coil casing position and the top coil casing in the bottom coil casing
position and reattach the fan deck, fan(s) and plenum box (if applicable)
in the original locations.
note
The leaving air side of the n pack will remain the same
after changing the coil handing.
COILS
All fan coils are available in 2 or 4 pipe congurations. Heating and
cooling coils are eld reversible for right or left side connections. On units
with water coils, the maximum water pressure applied to the unit should
never exceed 300 PSIG at 200°F. On units with steam heating coils, the
maximum steam pressure applied to the unit should never exceed 15
PSIG. The drain piping and steam trap should be sized and routed to
allow for proper condensate ow. (Minimum ambient temperature 35°F.
Coils may freeze.)
PIPING CONNECTIONS
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 Catalogs detailing unit operation, controls, and
connections should be thoroughly reviewed BEFORE beginning the
connection of the various cooling and/or heating mediums to the unit.
All accessory valve packages should be installed as required, and all
valves should be checked for proper operation. If coil and valve package
connections are to be made with “sweat” or solder joint, care should be
taken to assure that no components in the valve package are subjected
to a high temperature which may damage seals or other materials. Many
two-position electric control valves, depending on valve operation, are
provided with a manual-opening lever. This lever should be placed in the
“open” position during all soldering or brazing operations. Valve bodies
should be wrapped with a wet rag to help dissipate heat encountered
during brazing. Use a brazing alloy to make connections such as BCup- 2.
Soft solder is not recommended.
If the valve package connection at the coil is made with a union, the coil
side of the union must be prevented from twisting (“backed up”) during
tightening to prevent damage to the coil tubing. Over-tightening must be
avoided to prevent distorting the union seal surface and destroying the
union. In the case of eld installed valves and piping, the chilled water
valve cluster (or expansion valve on DX units) should be installed in such
a way that any dripping or sweating is contained in the auxiliary drain pan
or other device. Valves and TXV’s should be secured or supported to
avoid damage to coil headers or distributor tubes.
DUCTWORK CONNECTIONS
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, Superior Rex supply and return
grilles are available in a variety of types.
All units must be installed in non-combustible areas. Some models
are designed to be connected to ductwork with a MINIMUM amount of
external static pressure. Consult the approved submittals and the product
catalog for unit external static pressure limitations.
Units provided with outside air for ventilation should have some form of
low temperature protection to prevent coil freeze-up. Outside air should
be pretreated for best results.
It should be noted that none of these methods would 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. Consult glycol supplier literature for correct solution ratios.

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The manufacturer assumes no responsibility for undesirable system
operation due to improper design, equipment or component selection, and/
or installation of ductwork, grilles, and other eld supplied components.
ELECTRICAL CONNECTIONS
The electrical service to the unit should be compared to the unit nameplate
to verify compatibility. The routing and sizing of all conduit, and the type
and sizing of all wiring and other electrical components such as circuit
breakers, disconnect 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. The unit nameplate
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 different and
each unit on a project may be different, the installer must be familiar with the
wiring diagram and nameplate on the unit BEFORE beginning any wiring.
This unit is not acceptable for installation in hazardous/explosive areas.
CONTROL ENCLOSURE
The optional electrical control enclosure provides access to the electrical
compartment. This compartment houses all electric heat and control
components. Terminal strips are furnished for simple power and control
wiring connections. Multiple knockouts allow wiring entries from either
side of the compartment.
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 all electrical 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 applicable wiring diagrams. Failure to do so could result in personal
injury or damage to components and will void all manufacturers’ warranties.
The fan motor(s) should never be controlled by any wiring or device
other than the factory furnished switch or thermostat/switch combination,
without factory authorization.
All eld wiring should be done in accordance with governing codes
and ordinances. Any modication of the unit wiring without factory
authorization will result in voiding of all factory warranties and will nullify
any agency listings.
The manufacturer assumes no responsibility for any damages and/or
injuries resulting from improperly eld installed or wired components.
TELESCOPING BOTTOM PANEL
The telescoping bottom panel allows for fully recessing the unit while
permitting service access into the ceiling plenum. The architectural ceiling
panel is nished with a durable powder coat paint.
note
Portions of the inlet louver not directly below unit inlet may
require covering in the eld on applications where inltration
of ceiling plenum air into space is undesired. Telescoping
skirt and collar assembly must be eld adjusted to assure a
proper t between lter frame and louvered inlet panel
assembly. Refer to assembly submittal drawings for specic
dimensions.
START-UP
Before beginning any start-up operation, the startup 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 initial step in any startup 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 manufacturers’ warranties.

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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,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 or optional automatic, air vent tting installed on
the coil. In the case of the manual air vent tting, the screw should be
turned counterclockwise no more than 1-½ turns to operate the air vent.
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.
note
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
Unit
Size
Fan
Speed
Motor HP
(Quality) # Of
Fan
AMPs @120/1/60 AMPs @208-230/1/60 AMPs @277/1/60
PSC
ECM
PSC
ECM
PSC
ECM
PSC ECM FLA
3-Phase
Neutral
Current
FLA
3-Phase
Neutral
Current
FLA
3-Phase
Neutral
Current
06
High (1) 1/6
(1) 1/3 1
2.6
5.0 8.7
1.1
2.8 4.8
0.9
2.6 4.5Medium (1) 1/8 2.1 0.9 0.8
Low (1) 1/10 1.8 0.6 0.7
08
High (1) 1/4
(1) 1/3 1
3.8
5.0 8.7
1.6
2.8 4.8
1.3
2.6 4.5Medium (1) 1/6 3.3 1.0 0.8
Low (1) 1/8 2.6 0.8 0.7
10
High (1) 1/4
(1) 1/3 1
4.9
5.0 8.7
2.2
2.8 4.8
1.9
2.6 4.5Medium (1) 1/5 4.1 1.5 1.2
Low (1) 1/6 3.2 1.1 0.8
12
High (2) 1/6
(2) 1/3 2
5.2
10.0 17.3
2.2
5.6 9.7
1.8
5.2 9.0Medium (2) 1/8 4.2 1.8 1.6
Low (2) 1/10 3.6 1.2 1.4
14
High (2) 1/4
(2) 1/3 2
7.6
10.0 17.3
3.2
5.6 9.7
2.6
5.2 9.0Medium (2) 1/6 6.6 2.0 1.6
Low (2) 1/8 5.2 1.6 1.4
16
High (2) 1/4
(2) 1/3 2
9.8
10.0 17.3
4.4
5.6 9.7
3.8
5.2 9.0Medium (2) 1/5 8.2 3.0 2.4
Low (2) 1/6 6.4 2.2 1.6
18
High (2) 1/4
(2) 1/3 2
9.8
10.0 17.3
4.4
5.6 9.7
3.8
5.2 9.0Medium (2) 1/5 8.2 3.0 2.4
Low (2) 1/6 6.4 2.2 1.6
20
High (2) 1/4
(2) 1/3 2
9.8
10.0 17.3
4.4
5.6 9.7
3.8
5.2 9.0Medium (2) 1/5 8.2 3.0 2.4
Low (2) 1/6 6.4 2.2 1.6
Motor And Fan Data
NOTES:
1. Motor electrical data is nameplate data. Actual data will vary with application
2. Motors nameplated for 208-230/1/60. Data is at 230 volts
3. ECM motors operated on 208/1/60 power result in reduced airow

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AHRI Standard Ratings
Model/Size AHRI 440
Certied
Coil Airow CFM
(Dry Flow)
Cooling Capacity Water Power Input
(Watts)
Rows FPI QT (BTUH) QS (BTUH) Flow Rate (GPM) WPD (ft-wg)
RAHO 06 * 4 10 674 20549 15710 4.1 5.81 247
RAHO 08 * 4 10 872 24299 18090 4.9 7.29 375
RAHO 10 *4 10 1036 30600 22899 6.1 6.86 457
RAHO 12 * 4 10 1361 42650 32159 8.5 6.34 494
RAHO 14 4 10 1856 51080 40340 10.2 4.86 750
RAHO 16 4 10 2053 60689 46490 12 7.15 914
RAHO 18 4 10 2159 67819 50770 13.6 9.38 914
RAHO 20 4 10 2292 73930 54779 14.7 11.65 914
RAHR 06 * 4 10 669 20299 15560 4 5.64 247
RAHR 08 * 4 10 950 25889 19389 5.2 8.03 375
RAHR 10 * 4 10 1001 30180 22420 6.1 6.87 457
RAHR 12 * 4 10 1437 44169 33509 8.8 6.68 494
RAHR 14 4 10 1825 50779 39939 10.2 4.86 750
RAHR 16 4 10 1852 56810 43029 11.3 6.4 914
RAHR 18 4 10 1915 62750 46369 12.4 8.18 914
RAHR 20 4 10 1999 68059 49580 13.6 10.06 914
RAHC 06 * 4 10 594 18639 14149 3.7 4.98 247
RAHC 08 * 4 10 740 21719 15909 4.4 6.27 375
RAHC 10 * 4 10 845 26469 19479 5.2 5.49 457
RAHC 12 * 4 10 1193 38970 29020 7.8 5.5 494
RAHC 14 4 10 1491 43880 33979 8.7 3.69 750
RAHC 16 4 10 1665 52950 39669 10.5 5.69 914
RAHC 18 4 10 1762 60000 43779 12 7.84 914
RAHC 20 4 10 1855 64690 46790 12.8 9.13 914
NOTES:
1. Based on 80°F DB and 67°F WB EAT, 45°F EWT, 10°F temperature rise, high fan speed. Motor type is PSC and motor voltage is 115/1/60. Airow under dry coil
conditions. All models tested at 0.05" external static pressure.
2. Airow rate CFM on sizes 14 through 20 exceed maximum ratings in AHRI 440 and are therefore not certied

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AIR SYSTEM BALANCING
All ductwork must be complete and connected, and all grilles, lters,
access doors and panels must be properly installed to establish actual
system operating conditions BEFORE beginning air balancing operations.
Each individual unit and 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.
After the 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 such as the inspection,
installation, & start-up check sheet, a copy of which is provided on the
back of this manual. Contact the Sales Representative for additional
copies of this sheet.
WATER SYSTEM BALANCING
A complete knowledge of the hydronic system, its components, and
controls is essential to proper water system balancing and this procedure
should not be attempted by unqualied personnel. The system must be
complete and all components must be in operating condition BEFORE
beginning water system balancing operations.
Each hydronic system has different operating characteristics depending
on the devices and controls in the system. The actual balancing technique
may vary from one system to another.
After the proper system operation is established, the appropriate system
operating conditions such as various water temperatures and ow rates
should be recorded in a convenient place for future reference.
Before and during water system balancing, conditions may exist which
can result in noticeable water noise or undesired valve operation due to
incorrect system pressures. After the entire system is balanced, these
conditions will not exist on properly designed systems.
CONTROLS OPERATION
Before proper control operation can be veried all other systems must be in
proper operation. The correct water and air temperatures must be present
for the control function being tested. Some controls and features are
designed to not operate under certain conditions or beyond designed range.
A wide range of controls and electrical options and accessories may be
used with the equipment covered in this manual. Consult the approved
unit submittals, order acknowledgment, and other manuals for detailed
information regarding each individual unit and its controls. Since controls
and features may vary from one unit to another, care should be taken
to identify the controls to be used on each unit and their proper control
sequence. Information provided by component manufacturers regarding
installation, operation, and maintenance of their individual controls is
available upon request.
PHYSICAL DATA
Each unit on a job will have its own unique operating environment and
conditions that may dictate a maintenance schedule for that unit that is
different from other equipment on the job. A formal schedule of regular
maintenance and an individual unit log should be established and
maintained. This will help to achieve the maximum performance and
service life of each unit on the job.
note
Information regarding safety precautions contained in the
preface at the beginning of this manual should be followed
during any service and maintenance operations.
For more detailed information concerning service operations, consult your
Sales Representative.
MOTOR/BLOWER ASSEMBLY
The type of fan operation is determined by the control components and
their method of wiring, and may vary from unit to unit. Refer to the wiring
diagram for each unit for that unit’s individual operating characteristics.
Motors are permanently lubricated, PSC or ECM type and do not require
eld lubrication.

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FAN ASSEMBLY
Each fan assembly is easily removed from the unit at four ¼" weld studs
in the fan deck. In most applications the fan assembly can be removed
without disconnecting the ductwork for service access to motors and
blowers at, or away from the unit.
Should the assembly require more extensive service,the motor/blower
assembly may be removed from the unit to facilitate such operations as
motor or blower wheel/housing replacement, etc. Dirt and dust should
not be allowed to accumulate on the blower wheel or housing. This can
result in an unbalanced blower wheel condition that can damage a blower
wheel or motor. The wheel and housing may be cleaned periodically using
a vacuum cleaner and a brush taking care not to dislodge the factory
balancing weights on the blower wheel blades.
To remove the motor from the fan, disconnect the motor wire leads, loosen
the set screw on the motor shaft and remove the (3) cap screws that
attached the motor to the blower housing. To reassemble, insert the motor
into the blower wheel, (motor slots to be facing up) center the blower
wheel within the blower housing and tighten the set screw. Reinstall the
(3) cap screws and tighten to 40 in/lbs. Place the entire fan assembly back
up over the weld studs, install the washers and tighten the 1/4-20 nylok
nuts to 65 in/lbs.
COIL
Coils may be cleaned in place by removing the motor/blower assemblies
and brushing the entering air face between ns with a soft brush parallel
to ns.
Do not brush perpendicular to n orientation as damage may occur.
Brushing should be followed by cleaning with a vacuum cleaner. If a
compressed air source is available, the coil may also be cleaned by
blowing air through the coil ns from the leaving air face. Vacuuming
should again follow this. Units provided with the proper type of air lters,
replaced regularly, may require periodic coil cleaning.
Fan Assembly Removal
Electric Heater Removal

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Unit Weight Data
COMPONENT unit size
08 08 10 12 14 16 18 20
RAHO BASE UNIT 68 [31] 73 [33] 77 [35] 114 [52] 119 [54] 124 [56] 128 [58] 132 [60]
RAHR BASE UNIT 87 [40] 95 [43] 101 [46] 141 [64] 150 [68] 157 [71] 164 [75] 170 [77]
RAHR WITH MIXING BOX 119 [54] 132 [60] 144 [65] 189 [86] 204 [93] 217 [99] 229 [104] 246 [112]
RAHC BASE UNIT 137 [62] 146 [66] 158 [72] 202 [92] 219 [99] 228 [103] 240 [109] 250 [113]
TOTAL
COIL
ROWS
1 ROW - DRY 5 [2] 6 [3] 7 [3] 8 [4] 10 [5] 10 [5] 11 [5] 12 [5]
1 ROW - WET 7 [3] 9 [4] 10 [5] 11 [5] 14 [6] 14 [6] 16 [7] 17 [8]
2 ROW - DRY 11 [5] 13 [6] 14 [6] 16 [7] 20 [9] 20 [9] 22[10] 24 [11]
2 ROW - WET 14 [6] 18 [8] 20 [9] 23 [10] 27 [12] 28 [13] 32 [15] 35 [16]
3 ROW - DRY 16 [7] 19 [9] 21 [10] 24 [11] 30 [13] 30 [14] 33 [15] 36 [16]
3 ROW - WET 21 [10] 27 [12] 30 [14] 34 [15] 41 [19] 42 [19] 48 [22] 52 [24]
4 ROW - DRY 21 [10] 25 [12] 29 [13] 33 [15] 40 [18] 40 [18] 44 [20] 48 [22]
4 ROW - WET 27 [12] 35 [16] 41 [19] 46 [21] 54 [25] 56 [25] 64 [29] 69 [31]
5 ROW - DRY 26 [12] 30 [14] 34 [16] 38 [17] 42 [19] 46 [21] 50 [23] 54 [25]
5 ROW - WET 33 [15] 39 [18] 45 [21] 51 [23] 57 [26] 63 [29] 70 [32] 77 [35]
6 ROW - DRY 32 [15] 38 [17] 43 [19] 49 [22] 59 [27] 61 [28] 67 [30] 71 [32]
6 ROW - WET 42 [19] 53 [24] 61 [28] 69 [31] 80 [36] 85 [39] 97 [44] 103 [47]
7 ROW - DRY 38 [17] 42 [19] 48 [22] 54 [25] 60 [28] 66 [30] 72 [33] 78 [35]
7 ROW - WET 49 [23] 56 [26] 63 [29] 70 [32] 77 [35] 84 [38] 91 [42] 98 [45]
8 ROW - DRY 43 [20] 49 [22] 55 [25] 61 [28] 67 [30] 73 [33] 79 [36] 85 [39]
8 ROW - WET 55 [26] 63 [29] 71 [32] 79 [36] 87 [40] 95 [43] 103 [47] 111 [50]
NOTE: Unit weight data is in pounds [kilograms]
ELECTRIC RESISTANCE HEATER ASSEMBLY
Electric resistance heaters typically require no normal periodic
maintenance when unit air lters are changed properly. Other conditions
and equipment may affect the operation and service life in the system.
The two most important operating conditions for an electric heater are
proper airow and proper supply voltage. High supply voltage and/or
poorly distributed or insufcient airow over the element will result in
element overheating. This condition may result in the heater cycling on
the high limit thermal cutout. The open wire type heaters provided have an
automatic reset switch with a back-up high limit thermal switch. Automatic
reset switches are as the name implies; they reset automatically after the
heater has cooled down. High limit thermal switches must be replaced
once the circuit has been broken. The high limit thermal cutout device
is a safety device only and is not intended for continuous operation. With
proper unit application and during normal operation, the high limit thermal
cutout will not operate. This device only operates when some problem
exists and ANY condition that causes high limit cutout MUST be corrected
immediately. High supply voltage also causes excessive amperage draw
and may result in tripping of the circuit breaker or blowing of the fuses on
the incoming power supply.
ELECTRICAL WIRING & CONTROLS
The electrical operation of each unit is determined by the components
and wiring of the unit and may vary from unit to unit. Consult the wiring
diagram for the actual type and number of controls provided on each
unit. The integrity of all electrical connections should be veried at least
twice during the rst year of operation. Afterwards, all controls should
be inspected regularly for proper operation. Some components may
experience erratic operation or failure due to age. Wall thermostats
may also become clogged with dust and lint and should be periodically
inspected and cleaned to provide reliable operation.
When replacing any components such as fuses, contactors, or relays,
use only the exact type, size, and voltage component as furnished from
the factory. Any deviation without factory authorization could result in
personnel injury or damage to the unit and will void all factory warranties.
All repair work should be done in such a manner as to maintain the
equipment in compliance with governing codes and ordinances or testing
agency listings.

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ELECTRICAL CALCULATIONS INFORMATION
1. Calculate FLA = [(Motor Amps)*(Motor Qty) + (Heater Amps)]
2. Calculate MCA = [(1.25)*(FLA)]3. Calculate MOP = [(2.25)*(1st Motor
Amps) + (2nd Motor Amps) + (Heater Amps)]
a. If the calculated MOP is within 10% of the next smaller available
fuse size, that fuse size shall be used. If the calculated MOP is not
within 10% of the next smaller available fuse size, the next larger fuse
size above the calculated MOP must be used.
b. If the selected MOP is smaller than the MCA, the selected MOP
must be increased to the next larger available fuse size above the
MCA.4. Non-Fused Door Interlock Disconnect Switch shall be sized
according to MCA.
5. Fused Door Interlock Disconnect Switch and Main Fusing shall be
sized according to MOP. Available fuse sizes: 15, 20, 25, 30, 35, 40,
45, 50, 60, 70, 80 and 90.MCA and MOP calculations are based on
requirements from ANSI UL 1995 2nd Edition – CAN/CSA C22.2 No.
236-M90Standard for Safety; Heating and Cooling Equipment, which
incorporates rules from NFPA 70 National Electric Code 2002 edition.
RAH Electric Heat Selection Chart (AMPS)
Unit
Size
MBH 6.8 8.5 10.2 11.9 13.7 17.1 20.5 23.9 27.3 30.7 34.1 41.0 47.8
KW 2.0 2.5 3.0 3.5 4.0 5.0 6.0 7.0 8.0 9.0 10.0 12.0 14.0
Volts AMPS
06
115 17.4 21.7 26.1 30.4 34.8
208 9.6 12.0 14.4 16.8 19.2
230 8.7 10.9 13.0 15.2 17.4
277 7.2 9.0 10.8 12.6 14.4
08
115 17.4 21.7 26.1 30.4 34.8 43.5
208 9.6 12.0 14.4 16.8 19.2 24.0 28.8
230 8.7 10.9 13.0 15.2 17.4 21.7 26.1
277 7.2 9.0 10.8 12.6 14.4 18.1 21.7
10
115 17.4 21.7 26.1 30.4 34.8 43.5
208 9.6 12.0 14.4 16.8 19.2 24.0 28.8 33.7
230 8.7 10.9 13.0 15.2 17.4 21.7 26.1 30.4
277 7.2 9.0 10.8 12.6 14.4 18.1 21.7 25.3
12
115 34.8 43.5
208 19.2 24.0 28.8 33.7 38.5 43.3
230 17.4 21.7 26.1 30.4 34.8 39.1
277 14.4 18.1 21.7 25.3 28.9 32.5
14
115 34.8 43.5
208 19.2 24.0 28.8 33.7 38.5 43.3 48.1
230 17.4 21.7 26.1 30.4 34.8 39.1 43.5
277 14.4 18.1 21.7 25.3 28.9 32.5 36.1
16
115 34.8 43.5
208 19.2 24.0 28.8 33.7 38.5 43.3 48.1 57.7
230 17.4 21.7 26.1 30.4 34.8 39.1 43.5 52.2
277 14.4 18.1 21.7 25.3 28.9 32.5 36.1 43.3
18
115 34.8 43.5
208 19.2 24.0 28.8 33.7 38.5 43.3 48.1 57.7
230 17.4 21.7 26.1 30.4 34.8 39.1 43.5 52.2
277 14.4 18.1 21.7 25.3 28.9 32.5 36.1 43.3
20
115 34.8 43.5
208 19.2 24.0 28.8 33.7 38.5 43.3 48.1 57.7 67.3
230 17.4 21.7 26.1 30.4 34.8 39.1 43.5 52.2 60.9
277 14.4 18.1 21.7 25.3 28.9 32.5 36.1 43.3 50.5
NOTES:
1. Shaded areas indicate kW and voltage options not available
2. Available voltages are single phase, 60 hertz
3. Heaters over 48 AMPs are subdivided and fused per NEC

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VALVES & PIPING
No formal maintenance is required on the valve package components
most commonly used with fan coil units other than a visual inspection for
possible leaks in the course of other normal periodic maintenance. In the
event that a valve should need replacement, the same precautions taken
during the initial installation to protect the valve package from excessive
heat should also be used during replacement. In some cases, the valve
actuator may fail and usually can be replaced without removing valve
body from piping.
DRAIN
The drain should be checked before initial start-up and at the beginning
of each cooling season to assure that the lines are clear. If it is clogged,
steps should be taken to clear the debris so that condensate will ow
easily.
Periodic checks of the drain should be made during the cooling season
to maintain a free owing condensate. Should the growth of algae and/
or bacteria be a concern, consult an air conditioning and refrigeration
supply organization familiar with local conditions for chemicals available
to control these agents.
FILTERS
This unit is equipped with a standard 1" throwaway lter most commonly
used on fan coil units should be replaced on a regular basis. The time
interval between each replacement should be established based on
regular inspection of the lter and should be recorded in the log for each
unit. At a minimum, lters should be inspected monthly and replaced if
needed. Refer to the Filters chart for recommended lter size for each
product type and size. If the replacement lters are not purchased from
the factory, the lters used should be the same type, size and MERV
rating as that furnished from or recommended by the factory. Optional 1”
and 2” pleated lters are available and can be used in this unit. Contact
the local Sales Representative for the correct lter upgrade specication
and availability. Consult the factory for applications using lter types other
than the factory standard or optional product.
FILTER REPLACEMENT
To replace the lter(s), unscrew the thumb screws located at the bottom of
the lter bracket a few turns until the lter tray freely slides out. Slide out
the used lter(s) and replace with the new one(s). Reattach the lter tray
to the lter bracket with the supplied thumb screws.
note
The lter tray is fully adjustable and can be rotated 180
degrees if necessary to ensure a snug t between the lter
and the lter bracket.
UNIT
SIZE
COIL FACE
AREA NOMINAL FILTER SIZES 1 “ THROWAWAY FACE AREA
1” PLEATED
GROSS MEDIA
AREA
2” PLEATED
GROSS MEDIA
AREA
06 1.56 [0.15] (1) 16 x16 [406 x 406] 1.62 [0.15] 4.0 [0.37] 5.4 [.050]
08 2.08 [0.19] (1) 16 x 20 [406 x 508] 2.04 [0.19] 4.8 [0.45] 6.8 [0.63]
10 2.50 [0.23] (1) 16 x 25 [406 x3 81] 2.57 [0.24] 6.0 [0.56] 8.5 [0.79]
12 3.02 [0.28] (2) 16 x16 [406 x 406] 3.23 [0.30] 8.0 [0.74] 10.4 [0.97]
14 3.54 [0.33] (1) 16 x16 & (1) 16 x 20
(1) 406 x 406 (1) 406 x 508 3.65 [0.34] 8.8 [0.82] 12.2 [1.13]
16 4.06 [0.38] (2) 16 x20 {406 x508] 4.08 [0.38] 9.6 [0.89] 13.4 [1.24]
18 4.58 [0.43] (1) 16 x 20 & (1) 16 x 25
(1) [406 x 508] & (1) [406 x 635] 4.61 [0.43] 10.8 [1.00] 14.3 [1.33]
20 5.00 [0.46] (2) 16 x25 [406 x635] 5.14 [0.48] 12.0 [1.11] 17.0 [1.58]
Face Area, Free Area and Filter Sizes
NOTE: Units in inches [millimeters]

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REPLACEMENT PARTS
Factory replacement parts should be used wherever possible to maintain
the unit performance and operating characteristics and the testing agency
listings. Replacement parts may be purchased through the local Sales
Representative.
Contact the local Sales Representative before attempting any unit
modications. Any modications not authorized by the factory could
result in personal injury and damage to the unit and could void all factory
warranties.
When ordering parts, the following information must be supplied to ensure
proper part identication:
1. Complete unit model number
2. Unit hand connection (right or left hand) while facing the direction of
airow at the inlet
3. Complete part description including any numbers
On warranty replacements, in addition to the information previously listed,
the project CO # that appears on the unit nameplate, is required. Contact
the factory for authorization to return any parts such as defective parts
replaced in warranty. All shipments returned to the factory MUST be
marked with a Return Authorization Number, which is provided by the
factory.
All equipment and components sold through Superior Rex are warranted
under the same conditions as the standard manufacturer’s warranty with
the exception that the warranty period is 12 months unless the component
is furnished as warranty replacement. Parts furnished as warranty
replacements are warranted for the remaining term of the original unit
warranties.

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Model RAHO Free Return
NOTES:
1. Standard control enclosure is mounted on unit side opposite cooling coil connections.
Unit casing includes (2) knock outs on each side. Provide sufcient clearance to access
electrical controls and comply with applicable codes and ordinances.
2. Optional bottom control enclosure with hinged cover replaces standard side mounted
enclosure and includes (2) additional knockouts on bottom of unit on left side.
3. Standard externally foam coated galvanized steel drain pan has 7/8” ODM copper
outlet. Stainless steel drain pan has 3/4” MPT galvanized steel outlet.
4. Auxiliary drain outlet is 5/8” ODM copper or 3/8” MPT galvanized steel respectively.
DRAIN PAN
MATERIAL
SINGLE
CONNECTION (STD)
SECONDARY
CONNECTION (OPT)
GALVANIZED (STD) 7/8’ OD COPPER 5/8” OD COPPER
STAINLESS (OPT) 3/4” MPT GALV. 1/2” MPT GALV.
CONTROL ENCLOSURE SIZES
10 x 16 x 6 250 x406 x 152
16 x 16 x 6 406 x 406 x 152

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Model RAHO Free Return Unit
UNIT
SIZE
FAN
QTY A B C D E
06 1 14
[356]
20
[508]
23 1/8
[587]
34
[864]
6 7/8
[175]
08 1 19
[483]
25
[635]
28 1/8
[714]
39
[991]
8 1/4
[210]
10 1 23
[584]
29
[737]
32 1/8
[816]
43
[1092]
8 1/2
210
12 2 28
[711]
34
[864]
37 1/8
[943]
48
[1219]
6 7/8
[175]
14 2 33
[838]
39
[991]
42 1/8
[1070]
53
[1346]
8 1/2
[210]
16 2 38
[965]
44
[1118]
47 1/8
[1197]
58
[1473]
8 1/2
[210]
18 2 43
[1092]
49
[1245]
52 1/8
[1324]
63
[1600]
8 1/2
[210]
20 2 47
[1194]
53
[1346]
56 1/8
[1426]
67
[1702]
8 1/2
[210]
NOTES:
1. All dimensions are in inches [mm] and are +/- 1/8"
2. Drain pan is eld reversible 180 and externally insulated
3. Optional auxiliary drip pan available for piping package
condensate
4. Coil hand is eld reversible (left hand unit shown)

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Model RAHR Plenum Free Return
NOTES:
1. Standard control enclosure is mounted on unit side opposite cooling coil connections.
Unit casing includes (2) knock outs on each side. Provide sufcient clearance to access
electrical controls and comply with applicable codes and ordinances.
2. Optional bottom control enclosure with hinged cover replaces standard side mounted
enclosure and includes (2) additional knockouts on bottom of unit on left side.
3. Standard externally foam coated galvanized steel drain pan has 7/8" ODM copper
outlet. Stainless steel drain pan has 3/4" MPT galvanized steel outlet.
4. Auxiliary drain outlet is 5/8" ODM copper or 3/8" MPT galvanized steel respectively.
DRAIN PAN
MATERIAL
SINGLE
CONNECTION (STD)
SECONDARY
CONNECTION (OPT)
GALVANIZED (STD) 7/8’ OD COPPER 5/8” OD COPPER
STAINLESS (OPT) 3/4” MPT GALV. 1/2” MPT GALV.
CONTROL ENCLOSURE SIZES
10 x 16 x 6 250 x 406 x 152
16 x 16 x 6 406 x 406 x 152

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Model RAHR Plenum Free Return Unit
UNIT
SIZE
FAN
QTY A B C D E
06 1 14
[356]
20
[508]
23 1/8
[587]
34
[864]
16
[406]
08 1 19
[483]
25
[635]
28 1/8
[714]
39
[991]
19 7/8
[505]
10 1 23
[584]
29
[737]
32 1/8
[816]
43
[1092]
25 7/8
[657]
12 2 28
[711]
34
[864]
37 1/8
[943]
48
[1219]
32
[813]
14 2 33
[838]
39
[991]
42 1/8
[1070]
53
[1346]
35 7/8
[911]
16 2 38
[965]
44
[1118]
47 1/8
[1197]
58
[1473]
39 7/8
[1013]
18 2 43
[1092]
49
[1245]
52 1/8
[1324]
63
[1600]
44 7/8
[1140]
20 2 47
[1194]
53
[1346]
56 1/8
[1426]
67
[1702]
49 7/8
[1267]
NOTES:
1. All dimensions are in inches [mm] and are +/- 1/8"
2. Drain pan is eld reversible 180 and externally insulated
3. Optional auxiliary drip pan available for piping package
condensate
4. Coil hand is eld reversible (left hand unit shown)