These instructions are intended as an aid to qualified licensed
service personnel for proper installation, adjustment and
operation of this unit. Read these instructions thoroughly before
attempting installation or operation. Failure to follow these
instructions may result in improper installation, adjustment,
service or maintenance possibly resulting in fire, electrical
shock, property damage, personal injury or death.
Disconnect all power to unit
before installing or servicing.
More than one disconnect switch
may be required to de-energize
the equipment. Hazardous voltage
can cause severe personal injury
or death.
WARNING
!
If removal of the blower assembly is
required, all disconnect switches
supplying power to the equipment
must be de-energized and locked (if
not in sight of unit) so the field
power wires can be safely removed
from the blower assembly. Failure to
do so can cause electrical shock
resulting in personal injury or
death.
WARNING
!
Because of possible damage to
equipment or personal injury,
installation, service, and maintenance should be performed by a
trained, qualified service personnel. Consumer service is recommended only for filter cleaning/
replacement. Never operate the
unit with the access panels
removed.
ELECTRICAL WIRING)
(SEE SECTION 12.5: BLOWER
ASSEMBLY REMOVAL &
REPLACEMENT)
1.0 SAFETY INFORMATION
WARNING
!
Duct leaks can create an unbalanced system and draw pollutants such as dirt,
dust, fumes and odors into the home causing property damage. Fumes and
odors from toxic, volatile or flammable chemicals, as well as automobile
exhaust and carbon monoxide (CO), can be drawn into the living space
through leaking ducts and unbalanced duct systems causing personal injury
or death (see Figure 1).
• If air-moving equipment or ductwork is located in garages or off-garage storage areas - all joints, seams, and openings in the equipment and duct must
be sealed to limit the migration of toxic fumes and odors including carbon
monoxide from migrating into the living space.
• If air-moving equipment or ductwork is located in spaces containing fuel
burning appliances such as water heaters or boilers - all joints, seams, and
openings in the equipment and duct must also be sealed to prevent depressurization of the space and possible migration of combustion byproducts
including carbon monoxide into the living space.
WARNING
!
These instructions are intended as an aid to qualified, licensed service personnel for proper installation, adjustment and operation of this unit. Read these
instructions thoroughly before attempting installation or operation. Failure to
follow these instructions may result in improper installation, adjustment, service or maintenance possibly resulting in fire, electrical shock, property damage, personal injury or death.
WARNING (SEE SECTION 3.2: VERTICAL DOWNFLOW)
!
The RXHB-17, RXHB-21 or RXHB-24 combustible floor base is required when
some units with electric heat are applied downflow on combustible flooring.
Failure to use the base can cause a fire resulting in property damage, personal
injury or death. See CLEARANCES
See the accessory section in this manual for combustible floor base RXHB.
for units requiring a combustible floor base.
WARNING (SEE SECTION 4.3: GROUNDING)
!
The unit must be permanently grounded. Failure to do so can result in electrical shock causing personal injury or death.
WARNING (SEE SECTION 12.0: MAINTENANCE)
!
Units with circuit breaker(s) meet requirements as a service disconnect switch,
however, if access is required to the line side (covered) of the circuit breaker,
this side of the breaker(s) will be energized with the breaker(s) de-energized.
Contact with the line side can cause electrical shock resulting in personal
injury or death.
!
WARNING (SEE SECTION 5.0: DUCTWORK)
Do not, under any circumstances, connect return ductwork to any other heat
producing device such as fireplace insert, stove, etc. Unauthorized use of
such devices may result in fire, carbon monoxide poisoning, explosion, personal injury or property damage.
Continued on next page ➜
3
Page 4
WARNING
!
PROPOSITION 65: This appliance contains fiberglass insulation.
Respirable particles of fiberglass
are known to the State of California
to cause cancer.
All manufacturer products meet current Federal OSHA Guidelines for
safety. California Proposition 65
warnings are required for certain
products, which are not covered by
the OSHA standards.
California's Proposition 65 requires
warnings for products sold in
California that contain or produce
any of over 600 listed chemicals
known to the State of California to
cause cancer or birth defects such
as fiberglass insulation, lead in
brass, and combustion products
from natural gas.
All “new equipment” shipped for
sale in California will have labels
stating that the product contains
and/or produces Proposition 65
chemicals. Although we have not
changed our processes, having the
same label on all our products facilitates manufacturing and shipping.
We cannot always know “when, or
if” products will be sold in the
California market.
You may receive inquiries from customers about chemicals found in, or
produced by, some of our heating
and air-conditioning equipment, or
found in natural gas used with some
of our products. Listed below are
those chemicals and substances
commonly associated with similar
equipment in our industry and other
manufacturers.
• Glass Wool (Fiberglass) Insulation
• Carbon Monoxide (CO).
• Formaldehyde
• Benzene
More details are available at the
websites for OSHA (Occupational
Safety and Health Administration),
at www.osha.gov
California’s OEHHA (Office of
Environmental Health Hazard
Assessment), at www.oehha.org
Consumer education is important
since the chemicals and substances
on the list are found in our daily
lives. Most consumers are aware
that products present safety and
health risks, when improperly used,
handled and maintained.
and the State of
.
WARNING (SEE SECTION 12.6: MOTOR REPLACEMENT)
!
To avoid electrical shock which can result in personal injury or death, use only
the screws furnished in the motor shell mounting holds. Screws are #8-18 x .25
in. long blunt nose thread forming. Screws longer than 1/4 in. may contact the
motor winding.
WARNING (SEE SECTION 7.0: AIR FILTER)
!
Do not operate the system without filters. A portion of the dust entrained in the
air may temporarily lodge in the duct runs and at the supply registers. Any circulated dust particles could be heated and charred by contact with the air handler elements. This residue could soil ceilings, walls, drapes, carpets and other
articles in the house.
Soot damage may occur with filters in place, when certain types of candles, oil
lamps or standing pilots are burned.
WARNING
!
The first 36 inches of supply air plenum and ductwork must be constructed of
sheet metal as required by NFPA 90B. The supply air plenum or duct must have
a solid sheet metal bottom directly under the unit with no openings, registers
or flexible air ducts located in it. If flexible supply air ducts are used they may
be located only in the vertical walls of a rectangular plenum, a minimum of 6
inches from the solid bottom. Metal plenum or duct may be connected to the
combustible floor base, if not, it must be connected to the unit supply duct
flanges such that combustible floor or other combustible material is not
exposed to the supply air opening from the downflow unit. Exposing combustible (non-metal) material to the supply opening of a downflow unit can
cause a fire resulting in property damage, personal injury or death.
Exceptions to downflow warnings:
• Installations on concrete floor slab with supply air plenum and ductwork
completely encased in not less than 2 inches of concrete (See NFPA 90B).
CAUTION (SEE SECTION 3.3: HORIZONTAL)
!
Horizontal units must be configured for right hand air supply or left hand air
supply. Horizontal drain pan must be located under indoor coil. Failure to use
the drain pan can result in property damage.
CAUTION (SEE SECTION 2.1: RECEIVING)
!
In compliance with recognized codes, it is recommended that an auxiliary
drain pan be installed under all evaporator coils or units containing evaporator
coils that are located in any area of a structure where damage to the building
or building contents may occur as a result of an overflow of the coil drain pan
or a stoppage in the primary condensate drain piping. See accessories for auxiliary horizontal overflow pan RXBM.
NOTICE
!
When used in cooling applications, excessive sweating may occur when unit is
installed in an unconditioned space. This can result in property damage.
NOTICE
!
Improper installation, or installation not made in accordance with the Underwriters
Laboratory (UL) certification or these instructions, can result in unsatisfactory
operation and/or dangerous conditions and are not covered by the unit warranty.
NOTICE
!
In compliance with recognized codes, it is recommended that an auxiliary drain
pan be installed under all evaporator coils or units containing evaporator coils
that are located in any area of a structure where damage to the building or building contents may occur as a result of an overflow of the coil drain pan or a stoppage in the primary condensate drain piping. See accessories section of these
instructions for auxiliary horizontal overflow pan information (model RXBM).
4
Page 5
NOTICE
!
Use of this air-handler during construction is not recommended. If operation during construction is absolutely required, the following temporary
installation requirements must be followed:
Installation must comply with all Installation Instructions in this manual
including the following items:
• Properly sized power supply and circuit breaker/fuse
• Air-handler operating under thermostatic control;
• Return air duct sealed to the air-handler;
• Air filters must be in place;
• Correct air-flow setting for application
• Removing the coil and storing it in a clean safe place is highly recommended until construction is completed and the outdoor unit is installed.
• Clean air-handler, duct work, and components including coil upon completion of the construction process and verify proper air-handler operating conditions according as stated in this instruction manual.
• NOTE: Electric strip heater elements tend to emit a burning odor for a few
days if dust has accumulated during construction. Heater elements are
easily damaged. Take great care when cleaning them. Low pressure compressed air is recommended for cleaning elements.
2.0 GENERAL INFORMATION
2.1 IMPORTANT INFORMATION ABOUT EFFICIENCY AND INDOOR
2.1 AIR QUALITY
Central cooling and heating equipment is only as efficient as the duct system that carries the cooled or heated air. To maintain efficiency, comfort and good indoor air quality,
FIGURE 1
MIGRATION OF DANGEROUS SUBSTANCES, FUMES, AND ODORS INTO LIVING SPACES
▲WARNING
Carbon Monoxide (CO) Poisoning
Can Cause Severe Injury or Death.
Carbon Monoxide from the exhaust of motor
vehicles and other fuel burning devices can be
drawn into the living space by the operation of the
central heating and air conditioning system.
Exhaust from motor vehicles, generators, garden
tractors, mowers, portable heaters, charcoal and gas
grills, gasoline powered tools, and outdoor camping
equipment contains carbon monoxide, a poisonous
gas that can kill you. You cannot see it, smell it, or taste
it.
•
Do NOT operate an automobile or any engine in a
garage for more than the few seconds it takes to
enter or exit the garage.
•
Do NOT operate any fuel-burning device in an
enclosed or partly enclosed space, or near
building windows, doors or air intakes.
The U.S. Consumer Product Safety Commission (CPSC)
and Health Canada recommend the installation of UL or
CSA certified Carbon Monoxide Alarm(s) in every home.
WARNING
!
Duct leaks can create an unbalanced system and draw pollutants such as dirt,
dust, fumes and odors into the home causing property damage. Fumes and
odors from toxic, volatile or flammable chemicals, as well as automobile
exhaust and carbon monoxide (CO), can be drawn into the living space
through leaking ducts and unbalanced duct systems causing personal injury
or death (see Figure 1).
• If air-moving equipment or ductwork is located in garages or off-garage storage areas - all joints, seams, and openings in the equipment and duct must
be sealed to limit the migration of toxic fumes and odors including carbon
monoxide from migrating into the living space.
• If air-moving equipment or ductwork is located in spaces containing fuel
burning appliances such as water heaters or boilers - all joints, seams, and
openings in the equipment and duct must also be sealed to prevent depressurization of the space and possible migration of combustion byproducts
including carbon monoxide into the living space.
NOTICE
!
Improper installation, or installation not made in accordance with the Underwriters
Laboratory (UL) certification or these instructions, can result in unsatisfactory
operation and/or dangerous conditions and are not covered by the unit warranty.
5
Page 6
it is important to have the proper balance between the air being supplied to each room
and the air returning to the cooling and heating equipment.
Proper balance and sealing of the duct system improves the efficiency of the heating
and air conditioning system and improves the indoor air quality of the home by reducing
the amount of airborne pollutants that enter homes from spaces where the ductwork
and/or equipment is located. The manufacturer and the U.S. Environmental Protection
Agency’s Energy Star Program recommend that central duct systems be checked by a
qualified contractor for proper balance and sealing.
NOTICE
!
In compliance with recognized codes, it is recommended that an auxiliary
drain pan be installed under all evaporator coils or units containing evaporator coils that are located in any area of a structure where damage to the
building or building contents may occur as a result of an overflow of the
coil drain pan or a stoppage in the primary condensate drain piping. See
accessories section of these instructions for auxiliary horizontal overflow
pan information (model RXBM).
2.2 RECEIVING
Immediately upon receipt, all cartons and contents should be inspected for transit damage. Units with damaged cartons should be opened immediately. If damage is found, it
should be noted on the delivery papers, and a damage claim filed with the last carrier.
• After unit has been delivered to job site, remove carton taking care not to damage
unit.
• Check the unit rating plate for unit size, electric heat, coil, voltage, phase, etc. to be
sure equipment matches what is required for the job specification.
• Read the entire instructions before starting the installation.
• Some building codes require extra cabinet insulation and gasketing when unit is
installed in attic applications.
• If installed in an unconditioned space, apply caulking around the power wires, control
wires, refrigerant tubing and condensate line where they enter the cabinet. Seal the
power wires on the inside where they exit conduit opening. Caulking is required to
pre-vent air leakage into and condensate from forming inside the unit, control box,
and on electrical controls.
• Install the unit in such a way as to allow necessary access to the coil/filter rack and
blower/control compartment.
• Install the unit in a level position to ensure proper condensate drainage. Make sure
unit is level in both directions within 1/8”.
• Install the unit in accordance with any local code which may apply and the national
codes. Latest editions are available from: “National Fire Protection Association, Inc.,
Batterysmarch Park, Quincy, MA 02269.” These publications are:
• ANSI/NFPA No. 70-(Latest Edition) National Electrical Code.
• NFPA90A Installation of Air Conditioning and Ventilating Systems.
• NFPA90B Installation of warm air heating and air conditioning systems.
• The equipment has been evaluated in accordance with the Code of Federal
Regulations, Chapter XX, Part 3280.
2.3 CLEARANCES
• All units are designed for “0” inches clearance to combustible material on all cabinet
surfaces.
• Units with electric heat require a one inch clearance to combustible material for the
first three feet of supply plenum and ductwork.
• Some units require a combustible floor base depending on the heating kW. The fol-
lowing table should be used to determine these requirements.
Model Cabinet Size172124
Maximum Model Designation kW151820
Additionally, if these units are installed down-flow, a combustible floor base is
required. See Accessories for Combustible Floor Base RXHB-XX.
Units with electric heating kW equal to
not require a combustible floor base.
• Vertical units require clearance on at least one side of the unit for electrical connec-
tions. Horizontal units require clearance on either top or bottom for electrical connections. Refrigerant and condensate drain connections are made on the front of the unit.
• All units require 24 inches minimum access to the front of the unit for service.
• These units may be installed in either ventilated or nonventilated spaces.
• Supply circuit protective devices may be fuses or “HACR” type circuit breakers.
• Largest motor load is included in single circuit and multiple circuit 1.
• If non-standard fuse size is specified, use next size larger fuse size.
• J Voltage (208/240V) single phase air handler is designed to be used with single or
three phase 208/240V power. In the case of connecting 3-phase power to the air handler terminal block, bring only two leads to the terminal block. Cap, insulate and fully
secure the third lead.
• The air handlers are shipped from the factory with the proper indoor coil installed, and
cannot be ordered without a coil.
• The air handlers do not have an internal filter rack. An external filter rack or other
means of filtration is required.
8
Page 9
2.5 DIMENSIONS & WEIGHTS
FIGURE 3
DIMENSIONS AND WEIGHTS
ELECTRICAL CONNECTIONS MAY EXIT TOP OR EITHER SIDE
HIGH VOLTAGE CONNECTION 7/8",
1 3/32", 1 31/32" DIA. KNOCK OUTS.
LOW VOLTAGE CONNECTION
5/8" AND 7/8" KNOCK OUT
(OUTSIDE OF CABINET)
Return Air Opening Dimensions
Model
Cabinet Size
17157⁄8193⁄4
21193⁄8193⁄4
24227⁄8193⁄4
Return AirReturn Air Opening
Opening WidthDepth/Length
(Inches)(Inches)
SUPPLY AIR
105/16
NOTE: 24" CLEARANCE REQUIRED
IN FRONT OF UNIT FOR FILTER
AND COIL MAINTENANCE.
UPFLOW UNIT SHOWN;
UNIT MAY BE INSTALLED UPFLOW, DOWNFLOW.
HORIZONTAL RIGHT, OR LEFT AIR SUPPLY.
UNIT
WIDTH
“W” IN.
[mm]
1
17
/2"
[444.5]
1
17
/2"
[444.5]
21"
[533.4]
21"
[533.4]
21"
[533.4]
1
/2"
24
[622.3]
1
/2"
24
[622.3]
SUPPLY
DUCT
“A” IN.
[mm]
16"
[406.4]
16"
[406.4]
1
/2"
19
[495.3]
1
/2"
19
[495.3]
1
/2"
19
[495.3]
23"
[581.2]
23"
[581.2]
AIRFLOW
COIL (NOM.) [L/s]
LOHI
600
[283]
1000
[472]
1200
[566]
1000
[472]
1400
[661]
1600
[755]
1800
[850]
800
[378]
1200
[566]
—
1200
[566]
1600
[755]
—
—
2111/16
A-1038-01
UNIT WEIGHT / SHIPPING
WEIGHT (LBS.) [kg]
UNIT WITH
COIL (MAX. kW.)
82/96
[37.1]/[43.5]
92/106
[41.7]/[48.0]
97/112
[43.9]/[50.8]
150/166
[68.0]/[75.2]
150/166
[68.0]/[75.2]
162/180
[73.4]/[81.6]
181/198
[82.1]/[89.8]
9
Page 10
3.0 APPLICATIONS
3.1 VERTICAL UPFLOW
• Vertical Upflow is the factory configuration for all models (see Figure 3).
• If a side return air opening is required, field fabricate a return air plenum with an opening large enough to supply unit and strong enough to support unit weight.
• If return air is to be ducted, install duct flush with floor. Use fireproof resilient gasket 1/8
to 1/4 in. thick between duct, unit and floor. Set unit on floor over opening.
FIGURE 4
DIMENSIONS FOR FRONT CONNECT COIL
515/16
41/8
31/16
13/16
11/8
11/16
13/8
213/16
51/4
53/8
3.2 VERTICAL DOWNFLOW
Conversion to Vertical Downflow: A vertical upflow unit may be converted to vertical
downflow. Remove the door and indoor coil and reinstall 180° from original position (see
Figure 5).
A second set of coil rails must be field installed for vertical down-flow and horizontal right
applications. Fastener clearance holes will need to be drilled in the cabinet sides (proper
hole locations are marked with “dimpled” for this purpose). Note that the shorter (no
notch) coil rail must be mounted on the left-hand side to provide clearance for the drainpan condensate connection boss.
IMPORTANT: To comply with certification agencies and the National Electric Code for
horizontal right application, the circuit breaker(s) on field-installed electric heater kits
must be re-installed per procedure below so that the breaker switch “on” position and
marking is up and, “off” position and marking is down.
- To turn breaker(s): Rotate one breaker pair (circuit) at a time starting with the one on the
right. Loosen both lugs on the load side of the breaker. Wires are bundles with wire ties,
one bundle going to the right lug and one bundle going to the left lug.
- Using a screwdriver or pencil, lift white plastic tab with hole away from breaker until
breaker releases from mounting opening (see Figure 5).
- With breaker held in hand, rotate breaker so that “on” position is up, “off” position is down
with unit in planned vertical mounting position. Insert right wire bundle into top right
breaker lug, ensuring all strands of all wires are inserted fully into lug, and no wire insulation is in lug.
- Tighten lug as tight as possible while holding circuit breaker. Check wires and make sure
each wire is secure and none are loose. Repeat for left wire bundle in left top circuit
breaker lug.
- Replace breaker by inserting breaker mounting tab opposite white pull tab in opening,
hook mounting tab over edge in opening.
10
Page 11
FIGURE 5
ROTATING CIRCUIT BREAKER
- With screwdriver or pencil, pull white tab with hole away from breaker while setting that
side of breaker into opening. When breaker is in place, release tab, locking circuit breaker into location in opening.
- Repeat above operation for remaining breaker(s) (if more than one is provided).
- Replace single point wiring jumper bar, if it is used, on line side of breaker and tighten
securely.
- Double check wires and lugs to make sure all are secure and tight. Check to make sure
unit wiring to circuit breaker load lugs match that shown on the unit wiring diagram.
• RXHB combustible floor base is used for all unit sizes. Unit must be centered on combustible base in the width dimension (143/8”). (See Section 14.0 for more information
on the combustible floor base.)
DRIP LOOP: When installing the unit in down-flow or horizontal-right positions, make
sure that the wires coming from the motor form a proper drip loop. This allows water to
cascade off the lowest point of the wiring before it enters the motor head. This may
require cutting the wire tie and installing a new wire tie to form this loop.
WARNING
!
The RXHB-17, RXHB-21 or RXHB-24 combustible floor base is required
when some units with electric heat are applied downflow on combustible
flooring. Failure to use the base can cause a fire resulting in property damage, personal injury or death. See CLEARANCES for units requiring a combustible floor base. See the accessory section in this manual for combustible floor base RXHB.
3.3 HORIZONTAL
Horizontal left is the default factory configuration for “HM” (airflow direction) units.
Conversion to Horizontal: A vertical upflow unit (AU) may be converted to horizontal by
removing the indoor coil and installing horizontal drain pan on coil as shown for right
hand or left hand air supply. Reinstall coil in unit as shown for right or left hand air supply. See Figures 6 & 7. (See Section 14.0 for more information on the Horizontal Adapter
Kit.)
• Rotate unit into the downflow position, with the coil compartment on top and the blower compartment on bottom.
• A second set of coil rails must be field installed for vertical down-flow and horizontal
right applications. Fastener clearance holes will need to be drilled in the cabinet sides
(proper hole locations are marked with “dimples” for this purpose). Note that the shorter
(no notch) coil rail must be mounted on the left-hand side to provide clearance for the
drain-pan condensate connection boss.
• Reinstall the indoor coil 180° from original position. Ensure the retaining channel is fully
engaged with the coil rail. (See Figure 6, Detail A.)
• Secondary drain pan kits RXBM- are required when the unit is configured for the horizontal right position over a finished ceiling and/or living space. (See Section 14.0:
Accessories - Kits - Parts.)
IMPORTANT: Units cannot be installed horizontally laying on or suspended from the
back of the unit.
11
Page 12
FIGURE 6
VERTICAL DOWNFLOW & HORIZONTAL RIGHT APPLICATIONS
ENSURE THE RETAIN-
ING CHANNEL IS FULLY
ENGAGED WITH THE
RAILS
RAILS
DETAIL A
COIL RAIL.
FIGURE 7
INDOOR COIL AND DRAIN PAN SET-UP
STRAPS
HORIZONTAL ADAPTER
FRONT WATER
CONNECTION
HORIZONTAL
CONNECTION
CONNECTION
KIT
CATCHER
VAPOR LINE
AUXILIARY
DRAIN
PRIMARY
DRAIN
UPFLOW/DOWNFLOW
DRAIN CONNECTION
AUXILIARY
LIQUID LINE
CONNECTION
REAR WATER CATCHER
TOP AIR STOP
VERTICAL
DRAIN PAN
A-1037-01
12
CAUTION
!
Horizontal units must be configured for right hand air supply or left hand air
supply. Horizontal drain pan must be located under indoor coil. Failure to use
the drain pan can result in property damage.
Conversion in Horizontal Direction: Horizontal left-hand supply can be changed to hori-
zontal right-hand supply by removing the indoor coil and reinstalling 180° from original.
(See Figure 5.)
3.4 INSTALLATION IN AN UNCONDITIONED SPACE
The exterior cabinet of an air handler has a greater risk of sweating when installed in an
unconditioned space than when it is installed in the conditioned space. This is primarily
Page 13
due to the temperature of the conditioned air moving through the air handler and the air
circulating around the unit where it is installed. For this reason, we recommend the following for all air handler applications, but special attention should be paid to those
installed in unconditioned spaces:
• Duct sizing and airflow are critical and based on the equipment selected
• Supply and return duct attachment: If other than the factory flanges are used, the
attachment of ducting must be insulated and tight to prevent sweating.
• No perimeter supply flanges are provided. If a full perimeter supply duct is used, it is
the responsibility of the installer to provide duct flanges as needed, to secure and seal
the supply duct to prevent air leakage and the sweating that will result.
• All wire penetrations should be sealed. Take care not to damage, remove or compress insulation in those cases.
• In some cases, the entire air handler can be wrapped with insulation. This can be
done as long as the unit is completely enclosed in insulation, sealed and service
access is provided to prevent accumulation of moisture inside the insulation.
• As required, use a secondary pan that will protect the structure from excessive sweating or a restricted coil drain line.
• If a heater kit is installed, be sure the breaker or disconnect cover is sealed tightly to
the door panel.
3.5 INSTALLATION IN MOBILE/MANUFACTURED HOMES
1. Air handler must be secured to the structure using “L” brackets or pipe strap.
2. Allow a minimum of 24 inches (610 mm) front clearance required to access doors.
3. Recommended method for securing air handler:
A. If air handler is against the wall, secure top of air handler to wall stud using two
16ga thick angle brackets one on each side. Attach brackets with No. 10 self-tap-
1
⁄2 long screws to air handler and use 5⁄16 lag screws 11⁄2 long to wall stud.
ping
Secure bottom of unit with two 16ga “L” brackets with No. 10 self-tapping
screws to air handler and use
B. If air handler is away from wall attach pipe strap to top of air handler using No. 10
1
⁄2 long self-tapping screws on both sides. Angle strap down and away from back
of air handler, remove all slack, and fasten to wall stud of structure using
screws 1
1
⁄2 long. Secure bottom of unit with two 16ga “L” brackets with No. 10
self-tapping screws to air handler and use
5
⁄16 lag screws 11⁄2 long to floor.
5
⁄16 lag screws 11⁄2 long to floor.
1
⁄2 long
5
⁄16 lag
FIGURE 8
ST-A-1193-01
13
Page 14
4.0 ELECTRICAL WIRING
Field wiring must comply with the National Electric Code (C.E.C. in Canada) and any
applicable local ordinance.
WARNING
!
Disconnect all power to unit before installing or servicing. More than one
disconnect switch may be required to de-energize the equipment.
Hazardous voltage can cause severe personal injury or death.
4.1 POWER WIRING
It is important that proper electrical power is available for connection to the unit model
being installed. See the unit nameplate, wiring diagram and electrical data in the installation instructions.
• If required, install a branch circuit disconnect of adequate size, located within sight of,
and readily accessible to the unit.
• IMPORTANT: After the Electric Heater is installed, units may be equipped with one,
two, or three 30/60 amp. circuit breakers. These breaker(s) protect the internal wiring
in the event of a short circuit and serve as a disconnect. Circuit breakers installed
within the unit do not provide over-current protection of the supply wiring and therefore may be sized larger than the branch circuit protection.
• Supply circuit power wiring must be 75°C minimum copper conductors only. See
Electrical Data in this section for ampacity, wire size and circuit protector requirement.
Supply circuit protective devices may be either fuses or “HACR” type circuit breakers.
7
• Power wiring may be connected to either the right, left side or top. Three
31
/32” dia. concentric knockouts are provided for connection of power wiring to unit.
1
• Power wiring is connected to the power terminal block in unit control compartment.
/8”, 13/32”,
4.2 CONTROL WIRING
IMPORTANT: Class 2 low voltage control wire should not be run in conduit with power
wiring and must be separated from power wiring, unless class 1 wire of proper voltage
rating is used.
• Low voltage control wiring should be 18 Awg. color-coded. For lengths longer than
100 ft., 16 Awg. wire should be used.
• Low voltage control connections are made to low voltage pigtails extending from top
of air handler (upflow position - see Figure 3). Connections for control wiring are
made with wire nuts. Control wiring knockouts (5/8 and 7/8) are also provided on the
right and left side of the unit for side connection.
• See wiring diagrams attached to indoor and outdoor sections to be connected, or control wiring diagram booklet supplied with outdoor heat pump section for wiring connection.
• Make sure, after installation, separation of control wiring and power wiring has been
maintained.
4.3 GROUNDING
WARNING
!
The unit must be permanently grounded. Failure to do so can result in electrical shock causing personal injury or death.
• Grounding may be accomplished by grounding metal conduit when installed in accordance with electrical codes to the unit cabinet.
• Grounding may also be accomplished by attaching ground wire(s) to ground lug(s)
provided in the unit wiring compartment.
• Ground lug(s) are located close to wire entrance on left side of unit (upflow). Lug(s)
may be moved to marked locations near wire entrance on right side of unit (upflow), if
alternate location is more convenient.
• Use of multiple supply circuits require grounding of each circuit to lug(s) provided in
unit.
14
Page 15
4.4 ELECTRICAL WIRING
POWER WIRING
• Field wiring must comply with the National Electrical Code (C.E.C. in Canada) and
any applicable local ordinance.
• Supply wiring must be 75°C minimum copper conductors only.
• See electrical data for product Ampacity rating and Circuit Protector requirement.
GROUNDING
• This product must be sufficiently grounded in accordance with National Electrical
Code (C.E.C. in Canada) and any applicable local ordinance.
• A grounding lug is provided.
4.5 ELECTRICAL DATA – BLOWER MOTOR ONLY – NO ELECTRIC HEAT
4.5A Electrical Data – Blower Motor Only – No Electric Heat: (-)HSL
Installation of the UL Listed original equipment manufacturer provided heater kits listed in the following table is recommended for all
auxiliary heating requirements.
• ? Heater Kit Connection Type A=Breaker B=Terminal Block C=Pullout Disconnect
➀ D Voltage = 480 Volts.
*Values only. No single point kit available.
NOTES:
• Electric heater BTUH - (heater watts + motor watts) x 3.414 (see airflow table for motor watts.)
• Supply circuit protective devices may be fuses or “HACR” type circuit breakers.
• If non-standard fuse size is specified, use next size larger standard fuse size.
• Largest motor load is included in single circuit or circuit 1 of multiple circuits.
• Heater loads are balanced on 3 phase models with 3 or 6 heaters only.
• No electrical heating elements are permitted to be used with A Voltage (115V) air handler.
• J Voltage (208/240V) single phase air handler is designed to be used with single or three phase 208/240V electric heaters. In the case of connecting 3 phase power to air handler terminal block without the heater, bring only two leads to terminal block, cap, insulate and fully secure the
third lead.
• Do not use 480V electrical heaters on 208/240V air handler.
• If the kit is listed under both single and multiple circuits, the kit is shipped from factory as multiple circuits. For single phase application, Jumper
bar kit RXBJ-A21 and RXBJ-A31 can be used to convert multiple circuits to a single supply circuit. Refer to Accessory Section for details.
Installation of the UL Listed original equipment manufacturer provided heater kits listed in the following table is recommended for all
auxiliary heating requirements.
• ? Heater Kit Connection Type A=Breaker B=Terminal Block C=Disconnect Pullout
*Values only. No single point kit available.
NOTES:
• Electric heater BTUH - (heater watts + motor watts) x 3.414 (see airflow table for motor watts.)
• Supply circuit protective devices may be fuses or “HACR” type circuit breakers.
• If non-standard fuse size is specified, use next size larger standard fuse size.
• Largest motor load is included in single circuit or circuit 1 of multiple circuits.
• Heater loads are balanced on 3 phase models with 3 or 6 heaters only.
• No electrical heating elements are permitted to be used with A Voltage (115V) air handler.
• J Voltage (208/240V) single phase air handler is designed to be used with single or three phase 208/240V electric heaters. In the case of connecting 3 phase power to air handler terminal block without the heater, bring only two leads to terminal block, cap, insulate and fully secure the
third lead.
• Do not use 480V electrical heaters on 208/240V air handler.
• Do not use 208/240V electrical heaters on 480V air handler.
• If the kit is listed under both single and multiple circuits, the kit is shipped from factory as multiple circuits. For single phase application, Jumper
bar kit RXBJ-A21 and RXBJ-A31 can be used to convert multiple circuits to a single supply circuit. Refer to Accessory Section for details.
MARK HEATER INSTALLED/
L’APPAREIL DE CHAUFFAGE DE MARQUE A INSTALLE
If a heater
kit is listed
both
Single
and Multicircuit, the
kit is
shipped
as a Multicircuit and
will
require a
single
Only listed kits can be applied
point kit
Contractor
should “mark
or check” the
left column for
the kit installed
These are the
required maximum and minimum circuit
breaker sizes
for overcurrent
protection and
should not be
confused with
the size of the
breakers
installed in the
heater kit.
Heater Kit Supplemental Information: What allows the manufacturer to use standard Circuit Breakers
up to 60 amps inside the air handler, when using an approved Heater Kit?
National Electric Code (Section 424-22b) and our UL requirements allow us to subdivide heating element
circuits, of less than 48 amps, using breakers of not more than 60 amps and, additionally by, NEC 424-3b, a
rating not less than 125 percent of the load and NEC 424-22c, which describes the supplementary overcurrent protection required to be factory-installed within, or on the heater. The breakers in the heater kit are not,
and have never been, by NEC, intended to protect power wiring leading to the air handler unit. The breakers
in the heating kit are for short circuit protection. All internal unit wiring, where the breakers apply, has been
UL approved for short circuit protection.
Ampacity, (not breaker size), determines supply circuit wire size. The ampacity listed on the unit rating plate
and the Maximum and Minimum circuit breaker size (noted above) or in the units specification sheet or
installation instructions provides the information to properly select wire and circuit breaker/protector size. The
National Electric Code (NEC) specifies that the supply or branch circuit must be protected at the source.
22
Page 23
Single-Stage
A/C Thermostat
A/C Outdoor Unit
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
Y
C
W/BL
W1
G
Air Handler
Y2
ODD
R
Y
B
W2
G/BK
Y
W/BK
BL
G/Y
BR
R
Y/BL
R
Y
W
C
C
Single-Stage
A/C Thermostat
A/C Outdoor Unit
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
Y
C
W/BL
W1
G
Air Handler
Y2
ODD
R
Y
B
W2
G/BK
Y
W/BK
BL
G/Y
BR
R
Y/BL
R
Y
W
C
C
Humidistat
C
Y2
Two Stage
A/C Thermostat
A/C Outdoor Unit
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
D
Y
C
W/BL
W1
G
Air Handler
Y2
ODD
R
Y
B
W2
G/BK
Y
W/BK
G/Y
BR
R
Y/BL
R
Y
W2
W
C
BL
*
C
Heat Pump
Thermostat
Heat Pump
Outdoor Unit
D
B
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
B
E
Y
R
C
R
W1
C
G
Air Handler
Y2
ODD
R
Y
B
W2
Y
W/BK
G/BK
BL
Y/BL
BR
G/Y
W/BL
R
Y
W2
*
Humidistat
C
Heat Pump
Thermostat
Heat Pump
Outdoor Unit
D
B
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
B
E
Y
R
C
R
W1
C
G
Air Handler
Y2
ODD
R
Y
B
W2
Y
W/BK
G/BK
BL
Y/BL
BR
G/Y
W/BL
R
Y
W2
*
C
Y2
Heat Pump
Thermostat
Heat Pump
Outdoor Unit
D
B
G
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
B
E
Y
R
C
R
W1
C
G
Air Handler
Y2
ODD
R
Y
B
W2
Y
W/BK
G/BK
BL
Y/BL
BR
G/Y
W/BL
R
Y
W2
NOTE: These low voltage application diagrams are generic. Your
indoor/outdoor units may not have all the characteristics shown or may
not wire exactly as shown. Refer to the diagrams and information sent
with your indoor/outdoor sections.
WIRE COLOR CODE:
BK - BLACKG - GREENPR - PURPLEY - YELLOW
BR - BROWNGY - GRAYR - RED
GL - BLUEO - ORANGEW - WHITE
FIGURE 9
TYPICAL THERMOSTAT: STD COOLING W / ELECTRIC HEAT
FIGURE 11
TYPICAL THERMOSTAT: STD COOLING W / ELECTRIC HEAT USING A
2-STG DEHUMIDIFYING THERMOSTAT
*When using 13kW or higher, it is
recommitted to jump W1 and W2
together for maximum
outlet temperature rise.
FIGURE 10
TYPICAL THERMOSTAT: STD COOLING W / ELECTRIC HEAT USING A
HUMIDISTAT FOR DEHUMIDIFICATION
FIGURE 12
TYPICAL THERMOSTAT: HEAT PUMP W / ELECTRIC HEAT
FIGURE 13
TYPICAL THERMOSTAT: HEAT PUMP W / ELECTRIC HEAT USING A
HUMIDIFSTAT FOR DEHUMIDIFICATION
*When using 13kW or higher, it is
recommitted to jump W1 and W2
together for maximum
outlet temperature rise.
*When using 13kW or higher, it is
recommitted to jump W1 and W2
together for maximum
outlet temperature rise.
FIGURE 14
TYPICAL THERMOSTAT: HEAT PUMP W / ELECTRIC HEAT USING A 2STG DEHUMIDIFYING THERMOSTAT
*When using 13kW or higher, it is
recommitted to jump W1 and W2
together for maximum
outlet temperature rise.
23
Page 24
5.0 AIRFLOW PERFORMANCE
Airflow performance data is based on cooling performance with a coil and no filter in place.
Select performance table for appropriate unit size, voltage and number of electric heaters to
be used. Make sure external static applied to unit allows operation within the minimum and
maximum limits shown in table below for both cooling and electric heat operation. For optimum blower performance, operate the unit in the .3 to .7 in W.C. external static range. Units
with coils should be applied with a minimum of .1 in W.C. external static.
5.1 AIRFLOW OPERATING LIMITS
Cabinet Size1717/21212124
Cooling BTUH x 1,000-018-024-030-036-038-042-048-048-060
Cooling Tons Nominal1.522.533.53.5445
Heat Pump or Air Conditioning
Maximum Heat/Cool CFM [L/s]6759001125135013501575180018001930
(37.5 CFM [18 L/s]/1,000 BTUH)[319][425][531][637][637][743][850][850][911]
(450 CFM [212 L/s]/Ton Nominal)
Heat Pump or Air Conditioning
Nominal Heat/Cool CFM [L/s]6008001000120012001400160016001800
(33.3 CFM [16 L/s]/1,000 BTUH)[283][378][472][566]566][661][755][755][850]
(400 CFM [189 L/s]/Ton Nominal)
Heat Pump or Air Conditioning
Minimum Heat/Cool CFM [L/s]540720900108010801260144014401620
(30.0 CFM [14 L/s]/1,200 BTUH)[255][340][425][510][510][595][680][680][765]
(360 CFM [170 L/s]/Ton Nominal)
Maximum kW Electric Heating131318181820252530
& Minimum Electric Heat CFM [L/s]487 [230]617 [291]814 [384]1054 [497]1042 [492]1171 [553]1502 [709]1502 [709] 1666 [786]
Maximum Electric Heat Rise °F [°C]80 [26.7]63 [17.2]66 [18.9]51 [10.6]52 [11.1]49 [9.4]50 [10]50 [10]54 [12.2]
24
Page 25
5.2 240V AIRFLOW PERFORMANCE DATA – (-)HSL (PSC MOTOR)
• All 208/240V PSC motors have voltage taps for 208 and 240 volts.
• All 208/240V PSC motors are shipped on high speed and 240 volts.
• If the application external static is less than 0.5” WC, adjust the motor speed to the low static speed as described below.
- Unplug the black motor wire off the relay on the control board and plug in the red motor wire.
- Replace the cap on the black motor wire.
• Voltage change (208/240V motors):
- Move the orange lead to transformer 208V tap from 240V tap. Replace the wire cap on 240V tap.
- Unplug the purple motor wire off the transformer and plug in the yellow motor wire.
- Replace the cap on the purple motor wire.
• The above airflow table lists the airflow information for air handlers without heater and air handler with maximum heater allowed for each
model.
• The following formula can be used to calculate the approximate airflow, if a smaller (N kw) than the maximum heater kit is installed.
Approximate Airflow = Airflow without heater - (Airflow without heater - Airflow with maximum heater) X (N kw/maximum heater kw)
26
Page 27
5.3 115/208/480V AIRFLOW PERFORMANCE DATA – (-)HSL (PSC MOTOR)
• All 208/240V PSC motors have voltage taps for 208 and 240 volts.
• All 208/240V PSC motors are shipped on high speed and 240 volts.
• All 115V PSC motors are shipped on high speed.
• If the application external static is less than 0.5” WC, adjust the motor speed to the low static speed as described below:
- Unplug the black motor wire off the relay on the control board and plug in the red motor wire.
- Replace the cap on the black motor wire.
• Voltage change (208/240V motors):
- Move the orange lead to transformer to 208V tap from 240V tap. Replace the wire cap on 240V tap.
- Unplug the purple motor wire off the transformer and plug in the yellow motor wire.
- Replace the cap on the purple motor wire.
• All 480V PSC motors are shipped on high speed.
• If the application external static is less than 0.5” WC, adjust the motor speed to the low static speed as described below for 3-ton through
4-ton air handlers.
- Unplug the black motor wire off the relay and remove the cap from the red motor wire.
- Plug the red motor wire to the relay and connect the black motor wire with the yellow motor wire.
• For 5-ton air handler, unplug the black motor wire off the relay and plug in the red motor wire, then cap the black motor wire.
There is no yellow motor wire on 5-ton air handler.
WARNING: Do not connect red motor wire with yellow motor wire in any circumstance on 480V PSC motors. Connecting red motor wire with
yellow motor wire will result in permanent motor damage.
• The above airflow table lists the airflow information for air handlers without heater and air handler with maximum heater allowed for each
model.
• The following formula can be used to calculate the approximate airflow, if a smaller (N kw) than the maximum heater kit is installed.
Approximate Airflow = Airflow without heater - (Airflow without heater - Airflow with maximum heater) X (N kw/maximum heater kw)
28
Page 29
5.4 115/208/240/480V AIRFLOW PERFORMANCE DATA – (-)HLL (X-13 MOTOR)
X-13 motor speed changes
All X-13 motors have 5 speed tabs. Speed tab 1 is for continuous fan. Speed tab 2 (low static) and Speed tab 3 (high static) are for lower tonnage. Speed tab 4 (low stat-
ic) and Speed tab 5 (high static) are for higher tonnage.
X-13 air handlers are always shipped from factory at speed tab 5, except for -4824, which is set at speed tab 3.
The low static Speed tab 2 (lower tonnage) and 4 (higher tonnage) are used for external static below 0.5” WC. The high static Speed tab 3 (lower tonnage) and 5 (higher
tonnage) are used for external static exceeding 0.5” WC. Move the blue wire to the appropriate speed tab as required by the application needs.
• The airflow for continuous fan (Speed tab 1) is always set at 50% of the Speed tab 4.
• The above airflow table lists the airflow information for air handlers without heater and air handler with maximum heater allowed for each model.
• The following formula can be used to calculate the approximate airflow, if a smaller (N kw) than the maximum heater kit is installed.
Approximate Airflow = Airflow without heater - (Airflow without heater - Airflow with maximum heater) X (N kw/maximum heater kw)
31
Page 32
6.0 DUCTWORK
Field ductwork must comply with the National Fire Protection Association NFPA 90A,
NFPA 90B and any applicable local ordinance.
!
WARNING
Do not, under any circumstances, connect return ductwork to any other
heat producing device such as fireplace insert, stove, etc. Unauthorized
use of such devices may result in fire, carbon monoxide poisoning, explosion, personal injury or property damage.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered with a
vapor barrier. Fibrous ductwork may be used if constructed and installed in accordance
with SMACNA Construction Standard on Fibrous Glass Ducts. Ductwork must comply
with National Fire Protection Association as tested by U/L Standard 181 for Class I Air
Ducts. Check local codes for requirements on ductwork and insulation.
• Duct system must be designed within the range of external static pressure the unit is
designed to operate against. It is important that the system airflow be adequate. Make
sure supply and return ductwork, grills, special filters, accessories, etc. are accounted
for in total resistance. See airflow performance tables in this manual.
• Design the duct system in accordance with “ACCA” Manual “D” Design for Residential
Winter and Summer Air Conditioning and Equipment Selection. Latest editions are
available from: “ACCA” Air Conditioning Contractors of America, 1513 16th Street,
N.W., Washington, D.C. 20036. If duct system incorporates flexible air duct, be sure
pressure drop information (straight length plus all turns) shown in “ACCA” Manual
“D” is accounted for in system.
• Supply plenum is attached to the 3/4” duct flanges supplied with the unit. Attach
flanges around the blower outlet.
IMPORTANT: If an elbow is included in the plenum close to the unit, it must not be
smaller than the dimensions of the supply duct flange on the unit.
• IMPORTANT: The front flange on the return duct if connected to the blower casing
must not be screwed into the area where the power wiring is located. Drills or sharp
screw points can damage insulation on wires located inside unit.
• Secure the supply and return ductwork to the unit flanges, using proper fasteners for
the type of duct used and tape the duct-to-unit joint as required to prevent air leaks.
7.0 REFRIGERANT CONNECTIONS
Keep the coil connections sealed until refrigerant connections are to be made. See the
Installation Instructions for the outdoor unit for details on line sizing, tubing installation,
and charging information.
Coil is shipped with a low (5 - 10 PSIG) pressure charge of dry nitrogen. Evacuate the
system before charging with refrigerant.
Install refrigerant tubing so that it does not block service access to the front of the unit.
Nitrogen should flow through the refrigerant lines while brazing.
Use a brazing shield to protect the cabinet’s paint from being damaged by torch flames.
After the refrigerant connections are made, seal the gap around the connections with
pressure sensitive gasket. If necessary, cut the gasket into two pieces for a better seal
(See Figure 4.)
7.1 TEV SENSING BULB
IMPORTANT: DO NOT perform any soldering with the TEV bulb attached to any line.
After soldering operations have been completed, clamp the TEV bulb securely on the
suction line at the 10 to 2 o’clock position with the strap provided in the parts bag.
Insulate the TEV sensing bulb and suction line with the provided pressure sensitive insulation (size 4” x 7”) and secure with provided wire ties.
IMPORTANT: TEV sensing bulb should be located on a horizontal section of suction
line, just outside of coil box.
7.2 CONDENSATE DRAIN TUBING
Consult local codes or ordinances for specific requirements.
IMPORTANT: When making drain fitting connections to the drain pan, use a thin layer of
Teflon paste, silicone or Teflon tape and install hand tight.
32
Page 33
FIGURE 15
CONDENSATE DRAIN TRAP
DO NOT OPERATE UNIT WITHOUT
CONDENSATE DRAIN TRAP.
UNIT
3''
3''
DO NOT OVERTIGHTEN DRAIN FITTING
UNIT MUST BE SLIGHTLY INCLINED
TOWARD DRAIN CONNECTION.
IMPORTANT: When making drain fitting connections to drain pan, do not overtighten.
Overtightening fittings can split pipe connections on the drain pan.
• Install drain lines so they do not block service access to front of the unit. Minimum
clearance of 24 inches is required for filter, coil or blower removal and service access.
• Make sure unit is level or pitched slightly toward primary drain connection so that
water will drain completely from the pan. (See Figure 7.)
• Do not reduce drain line size less than connection size provided on condensate drain
pan.
• All drain lines must be pitched downward away from the unit a minimum of 1/8” per
foot of line to ensure proper drainage.
• Do not connect condensate drain line to a closed or open sewer pipe. Run condensate to an open drain or outdoors.
• The drain line should be insulated where necessary to prevent sweating and damage
due to condensate forming on the outside surface of the line.
• Make provisions for disconnecting and cleaning of the primary drain line should it
become necessary. Install a 3 in. trap in the primary drain line as close to the unit as
possible. Make sure that the top of the trap is below connection to the drain pan to
allow complete drainage of pan (See Figure 7).
• Auxiliary drain line should be run to a place where it will be noticeable if it becomes
operational. Occupant should be warned that a problem exists if water should begin
running from the auxiliary drain line.
• Plug the unused drain connection with the plugs provided in the parts bag, using a
thin layer of teflon paste, silicone or teflon tape to form a water tight seal.
• Test condensate drain pan and drain line after installation is complete. Pour water into
drain pan, enough to fill drain trap and line. Check to make sure drain pan is draining
completely, no leaks are found in drain line fittings, and water is draining from the termination of the primary drain line.
7.3 DUCT FLANGES
Field-installed duct flanges (4 pieces) are shipped with units. Install duct flanges as
needed on top of the unit. (See Figure 3.)
8.0 AIR FILTER (not factory-installed)
• External filter or other means of filtration is required. Units should be sized for a maxi-
mum of 300 feet/min. air velocity or that recommended for the type filter installed.
Filter application and placement are critical to airflow, which may affect the heating and
cooling system performance. Reduced airflow can shorten the life of the system’s major
components, such as motor, limits, elements, heat relays, evaporator coil or compressor.
Consequently, we recommend that the return air duct system have only one filter location. For systems with a return air filter grill or multiple filter grills, can have a filter
installed at each of the return air openings.
If high efficiency filters or electronic air cleaners are used in the system, it is important
that the airflow is not reduced to maximize system performance and life. Always verify
that the system’s airflow is not impaired by the filtering system that has been installed,
by performing a temperature rise and temperature drop test.
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Page 34
IMPORTANT: DO NOT DOUBLE FILTER THE RETURN AIR DUCT SYSTEM. DO NOT
FILTER THE SUPPLY AIR DUCT SYSTEM.
WARNING
!
Do not operate the system without filters. A portion of the dust entrained in the
air may temporarily lodge in the duct runs and at the supply registers. Any circulated dust particles could be heated and charred by contact with the air handler elements. This residue could soil ceilings, walls, drapes, carpets and other
articles in the house.
Soot damage may occur with filters in place, when certain types of candles, oil
lamps or standing pilots are burned.
9.0 SEQUENCE OF OPERATION
9.1 COOLING (COOLING ONLY OR HEAT PUMP)
• When the thermostat “calls for cooling,” the circuit between R and G is completed,
causing the blower relay (BR) to energize. The N.O. contacts will close, causing the
indoor blower motor (IBM) to operate. The circuit between R and Y is also completed:
This circuit closes the contactor (CC) in the outdoor unit starting the compressor
(COMP) and outdoor fan motor (OFM).
9.2 HEATING (ELECTRIC HEAT ONLY)
• When the thermostat “calls for heat,” the circuit between R and W is completed, and
the heater sequencer (HR
blower motor (IBM) will come on. Units with a second heater sequencer (HR
connected with the first sequencer (HR
nected to a second stage W
1) is energized. The heating elements (HE) and the indoor
2) can be
1) to W on the thermostat sub-base or con-
2 on the sub-base.
9.3 HEATING (HEAT PUMP)
• When the thermostat “calls for heat,” the circuits between R and B, R and Y and R
and G are completed. Circuit R and B energizes the reversing valve (RV) switching it
to the heating position (remains energized as long as selector switch is in “heat” position). Circuit R and Y energizes the contactor (CC) starting the outdoor fan motor
(OFM) and compressor (COMP). Circuit R and G energizes the blower relay (BR)
starting the indoor blower motor (IBM).
• If the room temperature should continue to fall, circuit R and W
second-stage heat room thermostat. Circuit R-W
The completed circuit will energize supplemental electric heat. Units with a second
heater sequencer (HR
mostat or connected to a third heating stage W
on the thermostat indicates when supplemental heat is being energized.
2) can be connected with first sequencer (HR1) to W2 on ther-
2 energizes a heat sequencer (HR1).
2 on the thermostat sub-base. A light
2 is completed by the
9.4 BLOWER TIME DELAY (HEATING OR COOLING)
• All models are equipped with a blower time delay (BTD) in lieu of a blower relay (BR)
(see wiring diagram). The blower will run for 30 seconds after the blower time delay
(BTD) is de-energized.
9.5 DEFROST (DEFROST HEAT CONTROL)
• For sequence of operation for defrost controls, see outdoor heat pump installation
instructions.
• Supplemental heat during defrost can be provided by connecting the purple (PU) pigtail in the outdoor unit to the W on the thermostat. This will complete the circuit
between R and W through a set of contacts in the defrost relay (DR) when the outdoor heat pump is in defrost. This circuit, if connected, will help prevent cold air from
being discharged from the indoor unit during defrost.
• For most economical operation, if cold air is not of concern during defrost, the purple
wire can be left disconnected. Supplemental heat will then come on only when called
for by second stage room thermostat.
34
Page 35
9.6 EMERGENCY HEAT (HEATING HEAT PUMP)
• If selector switch on thermostat is set to the emergency heat position, the heat pump
will be locked out of the heating circuit, and all heating will be electric heat. Jumper
should be placed between W2 and E on the thermostat sub-base so that the electric
heat control will transfer to the first stage heat on the thermostat. This will allow the
indoor blower to cycle on and off with the electric heat when the fan switch is in the
auto position.
9.7 ROOM THERMOSTAT (ANTICIPATOR SETTING)
See instructions with outdoor section, condensing unit or heat pump for recommended
room thermostats.
• On units with one electric heat sequencer (HR
anticipator setting should be .16.
• On units with two electric heat sequencers (HR
heat anticipator setting should be .32 if both are connected to same stage on thermostat. Setting should be .16 if (HR
NOTE: Some thermostats contain a fixed, non-adjustable heat anticipator. Adjustment
is not permitted.
• The thermostat should be mounted 4 to 5 feet above the floor on an inside wall of the
living room or a hallway that has good air circulation from the other rooms being controlled by the thermostat. It is essential that there be free air circulation at the location
of the same average temperature as other rooms being controlled. Movement of air
should not be obstructed by furniture, doors, draperies, etc. The thermostat should
not be mounted where it will be affected by drafts, hot or cold water pipes or air ducts
in walls, radiant heat from fireplace, lamps, the sun, T.V. or an outside wall. See
instruction sheet packaged with thermostat for mounting and installation instructions.
1 & HR2) are connected to separate stages.
1) (see wiring diagram on unit), heat
1 & HR2) (see wiring diagram on unit),
10.0 CALCULATIONS
10.1 CALCULATING TEMPERATURE RISE
• The formula for calculating air temperature rise for electric resistance heat is:
• The formula for calculating airflow using temperature rise and heating BTUH for units
with electric resistance heat is:
CFM =
Heating BTUH
1.08 x Temp. Rise
10.4 CALCULATING CORRECTION FACTOR
• For correction of electric heat output (kW or BTUH) or temperature rise at voltages
other than rated voltage multiply by the following correction factor:
Correction Factor =
3.16 x Watts
CFM
Applied Voltage
Rated Voltage
2
2
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11.0 PRE-START CHECKLIST
PRE-START CHECKLIST
❍
YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
Is unit properly located, level, secure and serviceable?
Has auxiliary pan been provided under the unit with
separate drain? (Units installed above a finished
ceiling).
Is condensate line properly sized, run, trapped,
pitched and tested?
Is ductwork correctly sized, run, taped and insulated?
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
❍ YES
❍ NO
start-up instructions and refrigerant charging instructions.
Have all cabinet openings and wiring been sealed
with caulking?
Is the filter clean, in place and of adequate size?
Is the wiring tight, correct and to the wiring diagram?
Is the unit properly grounded and protected (fused)?
Is the thermostat heat anticipator been set properly?
Is the unit circuit breaker(s) rotated properly “on” up
- “off” down?
Are the unit circuit breaker(s) line lug cover(s) in
place?
Are all access panels in place and secure?
Refer to outdoor unit installation instructions for system
12.0 MAINTENANCE
For continuing high performance, and to minimize possible equipment failure, it is essential that periodic maintenance be performed on this equipment. Consult your local dealer
as to the proper frequency of maintenance and the availability of a maintenance contract
IMPORTANT: Before performing any service or maintenance procedures, see the
“Safety Information” section at the front of this manual.
36
WARNING
!
Units with circuit breaker(s) meet requirements as a service disconnect switch,
however, if access is required to the line side (covered) of the circuit breaker,
this side of the breaker(s) will be energized with the breaker(s) de-energized.
Contact with the line side can cause electrical shock resulting in personal
injury or death.
12.1 AIR FILTER (NOT FACTORY-INSTALLED)
Check the system filter every ninety days or as often as found to be necessary and if
obstructed, clean or replace at once.
FILTER MAINTENANCE
Have your qualified installer, service agency or HVAC professional instruct you on how
to access your filters for regular maintenance.
IMPORTANT: Do not operate the system without a filter in place.
• New filters are available from your local distributor.
Page 37
12.2 INDOOR COIL - DRAIN PAN - DRAIN LINE
Inspect the indoor coil once each year for cleanliness and clean as necessary. In some
cases, it may be necessary to remove the filter and check the return side of the coil with
a mirror and flashlight.
IMPORTANT: Do not use caustic household drain cleaners, such as bleach, in the condensate pan or near the indoor coil. Drain cleaners will quickly damage the indoor coil.
12.3 BLOWER MOTOR AND WHEEL
Inspect the blower motor and wheel for cleanliness. It should be several years before it
would become necessary to clean the blower motor and wheel.
• If it becomes necessary to remove the blower assembly from the unit, see instructions
on removal and disassembly of motor, blower and heater parts.
• The blower motor and wheel may be cleaned by using a vacuum with a soft brush
attachment. Remove grease with a mild solvent such as hot water and detergent. Be
careful not to disturb the balance weights (clips) on the blower wheel blades. Do not
drop or bend wheel as balance will be affected.
12.4 LUBRICATION
The blower motor sleeve bearings are pre-lubricated by the motor manufacturer and do
not have oiling ports. Motor should be run for an indefinite period of time without additional lubrication.
12.5 BLOWER ASSEMBLY REMOVAL AND REPLACEMENT
Removing the blower assembly is not required for normal service and maintenance.
Removal is necessary for replacement of defective parts such as motor, blower wheel.
After extended use, removal of the blower assembly may become necessary for a thorough cleaning of the blower motor and wheel.
WARNING
!
If removal of the blower assembly is required, all disconnect switches supplying power to the equipment must be de-energized and locked (if not in sight of
unit) so the field power wires can be safely removed from the blower assembly.
Failure to do so can cause electrical shock resulting in personal injury or
death.
• Mark field power supply wiring (for replacement) attached to terminal block or circuit
breaker(s) on blower assembly. Remove wiring from terminal block or circuit breaker(s).
• Mark low voltage control wiring (for replacement) where attached to unit control pigtails on right side of blower housing. Remove wire nuts attaching field control wiring to
unit control pigtails.
• Remove 4 screws holding blower assembly to front channel of cabinet and pull blower
assembly from cabinet.
• To replace blower assembly, slide blower assembly into blower deck. Make sure
blower assembly engages lances in deck properly. If assembly hangs up, check to
make sure top and bottom are lined up in proper locations.
• Slide blower assembly to back of cabinet and make sure it is completely engaged.
• Replace 4 screws holding blower assembly to front channel of cabinet. Take care not
to strip screws, just snug into place.
• Replace low voltage control wiring with wire nuts and make sure wiring is to wiring
diagram and a good connection has been made.
• Replace field power wiring to terminal block or circuit breaker(s) on control area of
blower assembly. Make sure wires are replaced as they were, check wiring diagram if
necessary. Tighten supply power wiring securely to terminals lugs.
• Make sure wiring is within cabinet and will not interfere with access door. Make sure
proper separation between low voltage control wiring and field power wiring has been
maintained.
• Replace blower assembly control access panel before energizing equipment.
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12.6 MOTOR REPLACEMENT
With the blower assembly removed, the indoor blower motor can be removed and
replaced using the following procedure:
• Remove motor leads from the motor capacitor and blower relay. Note lead locations
for ease of reassembly. Pull leads from plastic bushing in blower side.
• Loosen the set screw holding blower wheel onto the motor shaft. Shaft extends
through blower hub so that a wrench can be used on the extended shaft to break the
shaft loose if necessary. Be careful not to damage shaft. A wheel puller can be used
on the groove in the blower hub if necessary.
• Remove 4 metal screws holding motor mounts to blower side and remove motor from
blower assembly.
• To install new motor, remove 1 screw holding motor mounts to motor shell and
remove mounts (four) from motor.
• Install (four) motor mounts to motor using same screw or screws supplied with
replacement motor.
WARNING
!
To avoid electrical shock which can result in personal injury or death, use only
the screws furnished in the motor shell mounting holds. Screws are #8-18 x .25
in. long blunt nose thread forming. Screws longer than 1/4 in. may contact the
motor winding.
• To reassemble, insert motor shaft through hub in blower wheel and orient motor to
original position with motor leads and motor label to front of blower (control area).
• Reassemble 12 sheet metal screws through motor mounts into blower side. Do not
overtorque screws, blower side is light gage sheet metal, just snug screws tight
enough to hold motor mounts in position.
• Turn motor shaft so that flat on shaft is located under blower wheel setscrew, and
blower wheel is centered in blower housing with the same distance on each side
between the inlet venturi and outside of blower wheel. Tighten setscrew on motor
shaft. Turn wheel by hand to make sure it runs true without hitting blower sides.
• Reassemble motor wiring to capacitor and blower relay making sure that wires match
wiring diagram and are tight and secure.
12.7 BLOWER WHEEL REPLACEMENT
With the blower assembly removed and the motor assembly removed (see above
instructions), remove the 4 screws holding the blower wrap (cutoff) to the blower sides.
• With wrap (cutoff) screws removed, cut off end of blower wrap will spring up. Lifting
wrap blower wheel is removed through the discharge opening in the blower housing.
• To replace, make sure wheel is oriented properly with hub to the opposite side from
the motor. Lift blower wrap and insert blower wheel through discharge opening in the
blower housing.
• Hold blower wrap down into position and replace two screws holding blower wrap to
blower sides.
• See motor replacement and blower assembly instructions for remaining assembly
procedure.
13.0 REPLACEMENT PARTS
Any replacement part used to replace parts originally supplied on equipment must be the
same as or an approved alternate to the original part supplied. The manufacturer will not
be responsible for replacement parts not designed to physically fit or operate within the
design parameters the original parts were selected for.
These parts include but are not limited to: Circuit breakers, heater controls, heater limit
controls, heater elements, motor, motor capacitor, blower relay, control transformer,
blower wheel, filter, indoor coil and sheet metal parts.
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When ordering replacement parts, it is necessary to order by part number and include
with the order the complete model number and serial number from the unit data plate.
(See parts list for unit component part numbers).
14.0 ACCESSORIES-KITS-PARTS
• Combustible Floor Base RXHB- for downflow applications.
Model Cabinet SizeBase Model Number
Combustible Floor
17RXHB-17
21RXHB-21
24RXHB-24
• Jumper Bar Kit 3 Ckt. to 1 Ckt. RXBJ-A31 is used to convert single phase multiple
three circuit units to a single supply circuit. Kit includes cover and screw for line side
terminals.
• Jumper Bar Kit 2 Ckt. to 1 Ckt. RXBJ-A21 is used to convert single phase multiple
two circuit units to a single supply circuit. Kit includes cover and screw for line side
terminals.
NOTE: No jumper bar kit is available to convert three phase multiple two circuit units
to a single supply circuit.
• External Filter Base RXHF- (See Figure 16)
Model Cabinet SizeFilter SizePart NumberAB
1716 x 20 [406 x 508]RXHF-1715.7017.50
2120 x 20 [508 x 508]RXHF-2119.2021.00
2425 x 20 [635 x 508]RXHF-2422.7025.50
Accommodate
1” or 2”
filter
• External Filter Rack: RXHF-B (See Figure 17)
FIGURE 16
EXTERNAL FILTER BASE: RXHF-
Model Cabinet SizeFilter SizePart NumberAB
1716 x 20 RXHF-B1716.9020.77
2120 x 20RXHF-B2120.4020.77
2425 x 20 RXHF-B2425.0021.04
Accommodate
1” filter
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Page 40
FIGURE 17
EXTERNAL FILTER RACK: RXHF- B17, B21, B24
➦
1.50
➦
B
A
• Horizontal Adapter Kit RXHH-
This horizontal adapter kit is used to convert Upflow/Downflow only models to horizontal flow. See the following table to order proper horizontal adapter kit.
Coil Model
Horizontal Adapter KitHorizontal Adapter Kit
Model Number (Single Qty.)Model Number (10-pak Qty.)