Rheem RHPL-HM2421JC, RHPL-HM4824JC, RHPL-HM3621JC, RHPL-HM6024JC Installation Instructions Manual
INSTALLATION INSTRUCTIONS
WARNING
ISO 9001:2008
AIR HANDLERS
RHPL Premium High Efficiency
Equipped With The Comfort Control
2
System™
!
▲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.
SUPERSEDES 92-20521-45-04
92-20521-45-05
CONTENTS
1.0 SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Important Information About Efficiency and Indoor Air Quality . . . . . . . 5
2.2 Receiving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Model Number Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Dimensions and Weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.0 APPLICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Zoning Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Vertical Upflow & Horizontal Left . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Vertical Downflow & Horizontal Right . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Installation In An Unconditioned Space. . . . . . . . . . . . . . . . . . . . . . . . 12
4.0 ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Copper Wire Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Blower Motor Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5 Electric Heat Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.0 AIR HANDLER Comfort Control
BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Comfort Control
5.2 Comfort Control
2
System™ Control Wiring . . . . . . . . . . . . . . . . . . . . . 15
2
Control Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Using the On-Board LED to Determine Blower CFM. . . . . . . . . . . . . . 16
5.4 Airflow Adjustments with the Comfort Control
5.5 Cooling Airflow Settings (by Tonnage). . . . . . . . . . . . . . . . . . . . . . . . . 17
5.6 Cooling Airflow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.7 Heating Airflow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.8 Electric Heat Airflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.9 Cooling Mode Dehumidification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.10 Cooling Delay Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.11 Conventional 24VAC Thermostat Control Wiring. . . . . . . . . . . . . . . . . 21
5.12 Using the On-Board LED to Determine Blower CFM. . . . . . . . . . . . . . 21
5.13 Cooling Airflow Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.14 Cooling Airflow Adjustments with Single Stage Condensing Units . . . 22
5.15 Heating Airflow Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.16 Airflow Adjustment (Trim). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.17 Electric Heat Airflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.18 Cooling Mode Dehumidification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.19 Cooling Delay Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.20 Air Handler Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.0 DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.0 REFRIGERANT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 TEV Sensing Bulb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Condensate Drain Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3 Duct Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.0 AIR FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.0 AIRFLOW PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1 Airflow Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.0 SEQUENCE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.1 Cooling (cooling only or heat pump) . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.2 Heating (electric heat only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.4 Emergency Heat (Heating of Heat Pump) . . . . . . . . . . . . . . . . . . . . . . 29
11.0 CALCULATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.1 Calculating Temperature Rise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.2 Calculating BTUH Heating Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.3 Calculating Airflow CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.4 Calculating Correction Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12.0 PRE-START CHECKLIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.0 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.1 Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.2 Indoor Coil/Drain Pan/Drain Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.3 Comfort Control
2
System™ Board Replacement. . . . . . . . . . . . . . . . . 32
13.4 Blower Motor & Wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
13.5 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
13.6 Blower Assembly Removal & Replacement. . . . . . . . . . . . . . . . . . . . . 33
13.7 Motor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
13.8 ECM Control Module Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13.9 Blower Wheel Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
14.0 REPLACEMENT PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
15.0 ACCESSORIES - KITS - PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2
System™ INTERFACE
2
System™ . . . . . . . . . . 16
2
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
!
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).
!
WARNING (SEE WARNINGS IN REGARD TO DUCTWORK)
Do not install this unit in manufactured (mobile) homes. Improper installation
is more likely in manufactured housing due to ductwork material, size, location, and arrangement. Installations in manufactured housing can cause a fire
resulting in property damage, personal injury or death.
EXCEPTION
mentation by a recognized inspection authority that the installation has been
made in compliance with the instructions and all warnings have been
observed.
!
WARNING (SEE SECTION 3.2: VERTICAL UPFLOW & HORIZONTAL LEFT)
If unit is to be installed without an indoor coil, return air duct, or plenum, it must
not be installed directly over combustible material. If installed without an indoor
coil with a return duct or plenum, the air plenum or duct must have a solid sheet
metal bottom with no return air openings, registers or flexible air ducts located
directly under the unit. Exposing combustible material to the return opening of
an upflow unit without an indoor coil can cause a fire resulting in property damage, personal injury or death.
!
WARNING (SEE SECTION 13.7: ECM CONTROL MODULE REPLACEMENT)
Always have 240 volt power turned off to the furnace before attempting any
replacement of the motor or control module. Failure to do so may result in serious equipment damage, personal injury or death.
WARNING (SEE SECTION 4.0: ELECTRICAL WIRING)
!
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.
: Manufactured housing installations are approved only with docu-
Continued on next page ➜
3
!
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 13.0: 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) deenergized. Contact with the line side can cause electrical shock resulting in
personal injury or death.
!
WARNING (SEE SECTION 13.5: BLOWER ASSEMBLY REMOVAL & REPLACEMENT)
If removal of the blower assembly is required, all disconnect switches supplying power to the airhandler 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
!
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 Proposition65 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 Californiawill have labels stating that
the product contains and/or produces Proposition65 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-conditioningequipment, 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.
• GlassWool (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
(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 California’s OEHHA
!
WARNING (SEE SECTION 6.0: 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.
!
WARNING
Because of possible damage to equipment or personal injury, installation, service, and maintenance should be performed by trained, qualified service personnel. Consumer service is recommended only for filter cleaning/replacement. Never operate the unit with the access panels removed.
Continued on next page ➜
4
WARNING (SEE SECTION 3.3: VERTICAL DOWNFLOW & HORIZONTAL RIGHT)
!
The RXHB-17, RXHB-21, or RXHB-24 combustible floor base is required when
certain units 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
section in this manual for combustible floor base RXHB-.
!
CAUTION (SEE SECTION 13.7: ECM CONTROL MODULE REPLACEMENT)
Reversing the 5-pin connector on the ECM motor causes immediate failure of
the control module.
for units requiring a combustible floor base. See the accessory
CAUTION (SEE SECTION 3.2: VERTICAL UPFLOW & HORIZONTAL LEFT)
Horizontal units must be configured for right 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 13.2: INDOOR COIL - DRAIN PAN - DRAIN LINE)
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 accessory section
in this manual for secondary horizontal drain pan RXBM-.
NOTICE
!
When used on 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).
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,
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.
5
FIGURE 1
MIGRATION OF DANGEROUS SUBSTANCES, FUMES, AND ODORS INTO LIVING SPACES
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.
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.
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).
6
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.
• Afterunit has been deliveredto jobsite,removecarton 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 MODEL NUMBER EXPLANATION (SEE FIGURE 2)
FIGURE 2
MODEL NUMBER EXPLANATION
RHPL–HM 24 21 JC
TRADEBRAND
CLASSIFICATION = AIR HANDLER
P = 16 SEER PREMIUM MODEL
L = R-410A REFRIGERANT
HM = A/C OR HEAT PUMP
MULTI-POSITION (Upflow &
Horizontal Left Is The Factory
Configuration)
AVAILABLE MODELS
RHPL-HM2421JC
RHPL-HM3621JC
RHPL-HM4824JC
RHPL-HM6024JC
DESIGN VARIATION
C = EQUIPPED WITH THE Comfort
C = Control
VOLTAGE
J = 208/240/1/60
CABINET SIZE
21 = 21" (600-1200 CFM)
24 = 24.5" (1200-1700 CFM)
CAPACITY
24 = 18000/24000 BTUH 48 = 42000/48000 BTUH
36 = 30000/36000 BTUH 60 = 60000 BTUH
2
System™
7
2.4 DIMENSIONS & WEIGHTS (SEE FIGURE 3)
FIGURE 3
DIMENSIONS AND WEIGHTS -- SINGLE COIL UNITS
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
NOTE: 24" CLEARANCE REQUIRED
IN FRONT OF UNIT FOR FILTER
AND COIL MAINTENANCE.
SUPPLY AIR
105/16
W
A
AUXILIARY DRAIN CONNECTION
3/4" FEMALE PIPE THREAD (NPT)
HORIZONTAL APPLICATION ONLY
PRIMARY DRAIN CONNECTION
3/4" FEMALE PIPE THREAD (NPT)
AUXILIARY DRAIN CONNECTION
3/4" FEMALE PIPE THREAD (NPT)
UPFLOW/DOWNFLOW APPLICATION
ONLY
LIQUID LINE CONNECTION
COPPER (SWEAT)
VAPOR LINE CONNECTION
COPPER (SWEAT)
UPFLOW UNIT SHOWN;
UNIT MAY BE INSTALLED UPFLOW, DOWNFLOW.
HORIZONTAL RIGHT, OR LEFT AIR SUPPLY.
DIMENSIONAL DATA
H
191/2
RETURN AIR OPENING
2111/16
RETURN AIR OPENING DIMENSIONS
Model Return Air Opening Return Air Opening
Cabinet Size Width (Inches) Depth/Length (Inches)
3
21 19
⁄8 191⁄2
24 227⁄8 191⁄2
A-1038-01
RHPL-HM
2421 21 [533] 42 1/2 [1080] 19 1/2 [495] 480 [227] 625 [295] 640 [302] 775 [366] 92 / 106 [42 / 48]
3621 21 [533] 42 1/2 [1080] 19 1/2 [495] 720 [340] 900 [425] 960 [453] 1200 [566] 92 / 106 [42 / 48]
4824 24 1/2 [622] 55 1/2 [1410] 23 [584] 960 [453] 1200 [566] 1280 [604] 1625 [767] 162 / 180 [73 / 82]
6024 24 1/2 [622] 55 1/2 [1410] 23 [584] 1040 [491] 1375 [649] 1360 [642] 1675 [791] 181 / 198 [82 / 90]
*Maximum dehumidification airflow. Refer to Section 5.0 ECM Motor Interface Control Board, for more information.
UNIT WIDTH
“W” IN. [mm]
UNIT HEIGHT
“H” IN. [mm]
SUPPLY DUCT
“A” IN. [mm]
NOMINAL COIL AIRFLOW [L/s]
ST
STAGE 2NDSTAGE
1
ODD* ODD*Normal Normal
8
UNIT WEIGHT / SHIPPING
WEIGHT (LBS.) [kg]
UNIT WITH COIL
(MAX. Kw.)
2.5 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 Size 21 24
Maximum Model Designation kW 18 20
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.
(See Figure 4.)
• All units require 24 inches maximum access to the front of the unit for service.
• These units may be installed in either ventilated or nonventilated spaces.
FIGURE 4
DIMENSIONS FOR FRONT CONNECT COIL
or less than the values listed in the table do
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3.0 APPLICATIONS
3.1 ZONING SYSTEMS
The manufacturer does not currently provide or supportzoning. However, zoning systems
can be installed with a variable speed air-handler as long as the zoning equipment manufacturers specificationsand installationinstructions are met and followed.
The preferred zoning method is to use a “bypass” system which is properly installed for
maximum efficiency. In these systems, excess air is routed back through the system to
be used again – this is opposed to a “dump” system in which excess air is routed to a
zone where it is expected that the extra heat or cooling would be least noticed.
If installed as a “bypass” system, the installation must have an optional freeze stat
installed to prevent the coil from icing with excess bypass cooling. Also, if the zoning
equipment manufacturer provides a limit switch (usually provided by the zoning manufacturer), this limit must be installed in the system to prevent the furnace from overheating.
3.2 VERTICAL UPFLOW AND HORIZONTAL LEFT
The air handler unit is factory shipped for vertical upflow and horizontal left application.
• 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.
• Support along the length of the unit, all units installed horizontally. Do not support or
suspend unit from both ends without support in the center of the cabinet. If unit is to
be supported or suspended from corners, run two reinforcing rails length of unit and
support or suspend from reinforcing rails.
• Secondary drain pan kits RXBM- are required when the unit is configured for the horizontal left position over a finished ceiling and/or living space. (See Section 15.0:
Accessories - Kits - Parts.)
FIGURE 5
VERTICAL DOWNFLOW & HORIZONTAL RIGHT APPLICATIONS
DETAIL A
ENSURE THE RETAIN-
ING CHANNEL IS FULLY
ENGAGED WITH THE
COIL RAIL.
CAUTION
Horizontal units must be configured for right hand air supply. Horizontal drain
pan must be located under indoor coil. Failure to use the drain pan can result
in property damage.
3.3 VERTICAL DOWNFLOW AND HORIZONTAL RIGHT
Conversion to Vertical Downflow/Horizontal Right: A vertical upflow unit may be converted to vertical downflow/horizontal right. (See Figure 5.)
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FIGURE 6
ROTATING CIRCUIT BREAKER
• Remove the indoor coil.
• Rotate the circuit breaker(s) (if in the horizontal right position) 180° (see instructions for
rotating breaker(s) that follow).
IMPORTANT: To comply with certification agencies and the National Electric Code,
units with circuit breaker(s) on vertical units must have circuit breakers installed so that
the breaker switch “on” position and marking is up and, “off” position and marking is
down.
- To turn breaker(s): Rotate one breakerpair (circuit) at a time starting with the one on the
right. Loosen both lugs on theload side of thebreaker. Wires are bundles with wire ties,
onebundlegoingto the rightlug andone bundle goingto theleft lug.
- Using a screwdriver or pencil, lift white plastic tab with hole away from breaker until
breakerreleases frommountingopening(see Figure6).
- Withbreakerheld in hand,rotatebreaker so that “on”position is up,“off” positionis down
with unit in planned vertical mounting position. Insert right wire bundle into top right
breakerlug, ensuring all strands of allwires are insertedfully intolug, and no wire insulationis in lug.
- Tighten lug as tight as possible while holding circuit breaker.Check wires and makesure
each wire is secure and none are loose. Repeat for left wire bundle in left top circuit
breakerlug.
- Replace breaker by inserting breaker mounting tab opposite white pull tab in opening,
hookmountingtab overedge in opening.
- With screwdriver or pencil, pull white tab with hole away from breaker while setting that
sideof breakerinto opening. When breaker is in place,releasetab, locking circuit breakerinto locationin opening.
- Repeat aboveoperationfor remaining breaker(s) (ifmore thanone 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
unitwiring to circuitbreakerloadlugs matchthatshown onthe unitwiringdiagram.
!
WARNING
The RXHB-17, RXHB-21, or RXHB-24 combustible floor base is required when
certain units 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-.
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• Rotate unitintothe downflowposition, withthe coilcompartment on topand the blowercompartmenton 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
engagedwith thecoil rail. (SeeFigure5, 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 15.0:
Accessories - Kits - Parts.)
FIGURE 7
INDOOR COIL AND DRAIN PAN SET-UP
STRAPS
HORIZONTAL ADAPTER
FRONT WATER
CATCHER
VAPOR LINE
CONNECTION
AUXILIARY
HORIZONTAL
DRAIN
CONNECTION
PRIMARY
DRAIN
CONNECTION
UPFLOW/DOWNFLOW
DRAIN CONNECTION
KIT
AUXILIARY
LIQUID LINE
CONNECTION
REAR WATER CATCHER
TOP AIR STOP
VERTICAL
DRAIN PAN
A-1037-01
IMPORTANT: Units cannot be installed horizontally laying on or suspended from the
back of the unit.
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
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.
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