Rheem RHPL-HM2421JC User manual

92-20521-45-05
SUPERSEDES 92-20521-45-04
NSTALLAT ON NSTRUCT ONS
A R HANDLERS
RHPL Premium High Efficiency
Equipped With The Comfort Control2System™
WARNING
▲WARN NG
!
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.
ISO 9001:2008

CONTENTS
1.0 SAFETY NFORMATON........................................3
2.0 GENERAL NFORMATON......................................5
2.1 Important Information About Efficiency and Indoor Air Quality . . . . . . . 5
2.2 Receiving................................................7
2.3 ModelNumberExplanation..................................7
2.4 DimensionsandWeights....................................8
2.5 Clearances...............................................9
3.0 APPLCATONS..............................................10
3.1 ZoningSystems..........................................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 ELECTRCALWRNG ........................................13
4.1 PowerWiring............................................13
4.2 Grounding..............................................13
4.3 CopperWireSize.........................................13
4.4 BlowerMotorElectricalData................................13
4.5 ElectricHeatElectricalData ................................14
5.0 A R HANDLER Comfort Control2System™ NTERFACE
BOARD ....................................................15
5.1 Comfort Control2System™ ControlWiring.....................15
5.2 Comfort Control2ControlBoard..............................16
5.3 Using the On-Board LED to Determine Blower C M. . . . . . . . . . . . . . 16
5.4 Airflow Adjustments with the Comfort Control2System™ ..........16
5.5 Cooling Airflow Settings (by Tonnage). . . . . . . . . . . . . . . . . . . . . . . . . 17
5.6 CoolingAirflowAdjustment.................................17
5.7 HeatingAirflowAdjustment.................................17
5.8 ElectricHeatAirflow.......................................18
5.9 Cooling Mode Dehumidification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.10CoolingDelayProfiles.....................................18
5.11 Conventional 24VAC Thermostat Control Wiring. . . . . . . . . . . . . . . . . 21
5.12 Using the On-Board LED to Determine Blower C M. . . . . . . . . . . . . . 21
5.13CoolingAirflowSettings....................................21
5.14 Cooling Airflow Adjustments with Single Stage Condensing Units . . . 22
5.15HeatingAirflowAdjustment.................................22
5.16AirflowAdjustment(Trim)...................................23
5.17ElectricHeatAirflow.......................................23
5.18 Cooling Mode Dehumidification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.19CoolingDelayProfiles.....................................24
5.20AirHandlerDiagnosticCodes...............................24
6.0 DUCTWORK................................................26
7.0 REFRGERANTCONNECTONS................................27
7.1 TEVSensingBulb........................................27
7.2 CondensateDrainTubing..................................27
7.3 Duct langes............................................28
8.0 ARFLTER.................................................28
9.0 ARFLOWPERFORMANCE....................................28
9.1 AirflowPerformanceData..................................29
10.0 SEQUENCEOFOPERATON...................................29
10.1 Cooling (cooling only or heat pump) . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.2Heating(electricheatonly).................................29
10.3Defrost.................................................29
10.4 Emergency Heat (Heating of Heat Pump) . . . . . . . . . . . . . . . . . . . . . . 29
11.0 CALCULATONS.............................................30
11.1 Calculating Temperature Rise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.2 Calculating BTUH Heating Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.3CalculatingAirflowC M....................................30
11.4 Calculating Correction actor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12.0 PRE-STARTCHECKLST......................................31
13.0 MANTENANCE..............................................31
13.1Air ilter................................................31
13.2 Indoor Coil/Drain Pan/Drain Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.3 Comfort Control2System™ Board Replacement. . . . . . . . . . . . . . . . . 32
13.4BlowerMotor&Wheel.....................................32
13.5Lubrication..............................................33
13.6 Blower Assembly Removal & Replacement. . . . . . . . . . . . . . . . . . . . . 33
13.7MotorReplacement.......................................33
13.8 ECM Control Module Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13.9BlowerWheelReplacement.................................34
14.0 REPLACEMENTPARTS.......................................35
15.0 ACCESSORES-KTS-PARTS ................................35
2

1.0 SAFETY INFORMATION
!WARNING (SEE WARNINGS IN REGARD TO DUCTWORK)
Do not install this unit in manufactured (mobile) homes. mproper installation
is more likely in manufactured housing due to ductwork material, size, loca-
tion, and arrangement. nstallations in manufactured housing can cause a fire
resulting in property damage, personal injury or death.
EXCEPT ON: Manufactured housing installations are approved only with docu-
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)
f unit is to be installed without an indoor coil, return air duct, or plenum, it must
not be installed directly over combustible material. f 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 dam-
age, 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 seri-
ous 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.
Continued on next page ➜
!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).
• f air-moving equipment or ductwork is located in garages or off-garage stor-
age 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.
• f 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 depres-
surization of the space and possible migration of combustion byproducts
including carbon monoxide into the living space.
3
!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, reg-
isters or flexible air ducts located in it. f 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 com-
bustible (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
• nstallations on concrete floor slab with supply air plenum and ductwork
completely encased in not less than 2 inches of concrete (See NFPA 90B).

4
!WARNING (SEE SECTION 13.5 BLOWER ASSEMBLY REMOVAL & REPLACEMENT)
f removal of the blower assembly is required, all disconnect switches supply-
ing 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 assem-
bly. Failure to do so can cause electrical shock resulting in personal injury or
death.
!WARNING
PROPOS T ON 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 pro-
duced by, some of our heating and air-conditioning equipment, or found in nat-
ural 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) nsulation
• Carbon Monoxide (CO).
• Formaldehyde
• Benzene
More details are available at the websites for OSHA (Occupational Safety and
Health Administration), at www.osha.gov and the State of 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 pre-
sent safety and health risks, when improperly used, handled and maintained.
!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, per-
sonal injury or property damage.
!WARNING
Because of possible damage to equipment or personal injury, installation, ser-
vice, and maintenance should be performed by trained, qualified service per-
sonnel. Consumer service is recommended only for filter cleaning/replace-
ment. Never operate the unit with the access panels removed.
Continued on next page ➜
!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) de-
energized. Contact with the line side can cause electrical shock resulting in
personal injury or death.
!WARNING (SEE SECTION 4.3 GROUNDING)
The unit must be permanently grounded. Failure to do so can result in electri-
cal shock causing personal injury or death.

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 car-
ries 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.
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.
5
!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 for units requiring a combustible floor base. See the accessory
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.
CAUTION (SEE SECTION 13.2 INDOOR COIL - DRAIN PAN - DRAIN LINE)
n 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-.
When used on cooling applications, excessive sweating may occur when unit
is installed in an unconditioned space. This can result in property damage.
!NOTICE
mproper 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 cov-
ered by the unit warranty.
!NOTICE
n compliance with recognized codes, it is recommended that an auxiliary
drain pan be installed under all evaporator coils or units containing evapo-
rator 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).
!NOTICE

6
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 liv-
ing space through leaking ducts and unbalanced duct systems causing
personal injury or death (see Figure 1).
• f 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.
• f 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
mproper 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
n 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).
F GURE 1
M GRAT ON OF DANGEROUS SUBSTANCES, FUMES, AND ODORS NTO L V NG SPACES

2.3 MODEL NUMBER EXPLANATION (SEE FIGURE 2)
2.2 RECEIVING
Immediately upon receipt, all cartons and contents should be inspected for transit dam-
age. 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 ire Protection Association, Inc.,
Batterysmarch Park, Quincy, MA 02269.” These publications are:
• ANSI/N PA No. 70-(Latest Edition) National Electrical Code.
• N PA90A Installation of Air Conditioning and Ventilating Systems.
• N PA90B Installation of warm air heating and air conditioning systems.
• The equipment has been evaluated in accordance with the Code of ederal
Regulations, Chapter XX, Part 3280.
F GURE 2
MODEL NUMBER EXPLANAT ON
RHP L–HM 24 21 JC
TRADEBRAND
CLASSI ICATION = AIR HANDLER
P = 16 SEER PREMIUM MODEL
L = R-410A RE RIGERANT
HM = A/C OR HEAT PUMP
MULTI-POSITION (Upflow &
Horizontal Left Is The actory
Configuration)
DESIGN VARIATION
C = EQUIPPED WITH THE Comfort
C=Control2System™
VOLTAGE
J = 208/240/1/60
CABINET SIZE
21 = 21" (600-1200 C M)
24 = 24.5" (1200-1700 C M)
CAPACITY
24 = 18000/24000 BTUH 48 = 42000/48000 BTUH
36 = 30000/36000 BTUH 60 = 60000 BTUH
7
AVA LABLE MODELS
RHPL-HM2421JC
RHPL-HM3621JC
RHPL-HM4824JC
RHPL-HM6024JC

8
2.4 DIMENSIONS & WEIGHTS (SEE FIGURE 3)
F GURE 3
D MENS ONS AND WE GHTS -- S NGLE CO L UN TS
D MENS ONAL DATA
A-1038-01
NOTE: 24" CLEARANCE REQUIRED
IN RONT O UNIT OR ILTER
AND COIL MAINTENANCE.
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
AUXILIARY DRAIN CONNECTION
3/4" EMALE PIPE THREAD (NPT)
HORIZONTAL APPLICATION ONLY
PRIMARY DRAIN CONNECTION
3/4" EMALE PIPE THREAD (NPT)
AUXILIARY DRAIN CONNECTION
3/4" EMALE PIPE THREAD (NPT)
UP LOW/DOWN LOW APPLICATION
ONLY
LIQUID LINE CONNECTION
COPPER (SWEAT)
VAPOR LINE CONNECTION
COPPER (SWEAT)
2111/16
105/16
SUPPLY A R
W
A
H
191/2
RETURN AIR OPENING
UPFLOW UN T SHOWN;
UN T MAY BE NSTALLED UPFLOW, DOWNFLOW.
HOR ZONTAL R GHT, OR LEFT A R SUPPLY.
Model Return Air Opening Return Air Opening
Cabinet Size Width (Inches) Depth/Length (Inches)
21 193⁄8191⁄2
24 227⁄8191⁄2
RETURN A R OPEN NG D MENS ONS
RHPL-HM UNIT WIDTH
“W” IN. [mm] UNIT HEIGHT “H” IN. [mm] SUPPLY DUCT “A” IN. [mm]
ODD* ODD*Normal Normal
1ST STAGE 2ND STAGE
NOMINAL COIL AIR LOW [L/s]
UNIT WITH COIL
(MAX. Kw.)
UNIT WEIGHT / SHIPPING
WEIGHT (LBS.) [kg]
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.

9
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:
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 or less than the values listed in the table do
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 connec-
tions. Refrigerant and condensate drain connections are made on the front of the unit.
(See igure 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.
F GURE 4
D MENS ONS FOR FRONT CONNECT CO L
Model Cabinet Size 21 24
Maximum Model Designation kW 18 20

3.0 APPLICATIONS
3.1 ZONING SYSTEMS
The manufacturer does not currently provide or support zoning. However, zoning systems
can be installed with a variable speed air-handler as long as the zoning equipment manu-
facturers specifications and installation instructions 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 manufac-
turer), 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 hori-
zontal left position over a finished ceiling and/or living space. (See Section 15.0:
Accessories - Kits - Parts.)
3.3 VERTICAL DOWNFLOW AND HORIZONTAL RIGHT
Conversion to Vertical Downflow/Horizontal Right: A vertical upflow unit may be con-
verted to vertical downflow/horizontal right. (See igure 5.)
F GURE 5
VERT CAL DOWNFLOW & HOR ZONTAL R GHT APPL CAT ONS
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.
DETA L A
ENSURE THE RETAIN-
ING CHANNEL IS ULLY
ENGAGED WITH THE
COIL RAIL.
10

• Remove the indoor coil.
• Rotate the circuit breaker(s) (if in the horizontal right position) 180° (see instructions for
rotating breaker(s) that follow).
MPORTANT: 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 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 igure 6).
- 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 insula-
tion 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.
- 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 break-
er 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.
F GURE 6
ROTAT NG C RCU T BREAKER
!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-.
11

• Rotate unit into the downflow position, with the coil compartment on top and the blower com-
partment on bottom.
• A second set of coil rails must be field installed for vertical down-flow and horizontal
right applications. astener 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 igure 5, Detail A.)
• Secondary drain pan kits RXBM- are required when the unit is configured for the hori-
zontal right position over a finished ceiling and/or living space. (See Section 15.0:
Accessories - Kits - Parts.)
MPORTANT: 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. or this reason, we recommend the fol-
lowing 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 com-
press 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 sweat-
ing 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.
F GURE 7
NDOOR CO L AND DRA N PAN SET-UP
12
A-1037-01
HORIZONTAL ADAPTER
KIT
REAR WATER CATCHER
TOP AIR STOP
STRAPS
VAPOR LINE
CONNECTION
RONT WATER
CATCHER
PRIMARY
DRAIN
CONNECTION
LIQUID LINE
CONNECTION
VERTICAL
DRAIN PAN
AUXILIARY
HORIZONTAL
DRAIN
CONNECTION
AUXILIARY
UP LOW/DOWN LOW
DRAIN CONNECTION

13
4.0 ELECTRICAL WIRING
ield wiring must comply with the National Electric Code (C.E.C. in Canada) and any
applicable local ordinance.
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 installa-
tion instructions.
• If required, install a branch circuit disconnect of adequate size, located within sight of,
and readily accessible to the unit.
• MPORTANT: After the Electric Heater is installed, units may be equipped with one,
two, or three 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.
• Power wiring may be connected to either the right, left side or top. Three 7/8”, 13/32”,
131/32” dia. concentric knockouts are provided for connection of power wiring to unit.
• Power wiring is connected to the power terminal block(s) in unit control compartment.
4.2 GROUNDING
• Grounding may be accomplished by grounding metal conduit when installed in accor-
dance 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.
MPORTANT: Not all heater kits are supplied with a means of electrical disconnect. If
circuit breakers are supplied with a heater kit, the circuit breakers are NOT rated for cir-
cuit protection.
!WARNING
The unit must be permanently grounded. Failure to do so can result in electri-
cal shock causing personal injury or death.
!WARNING
Disconnect all power to unit before installing or servicing. More than one dis-
connect switch may be required to de-energize the equipment. Hazardous volt-
age can cause severe personal injury or death.
S
U
P
P
L
Y
W
R
E
L
E
N
G
T
H
F
E
E
T
SUPPLY CIRCUIT AMPACITY
NOTE: WIRE BASED ON COPPER CONDUCTORS 75°C MINIMUM RATING.
OR MORE THAN 3 CONDUCTORS IN A RACEWAY OR CABLE, SEE
N.E.C. OR DERATING THE AMPACITY O EACH CONDUCTOR.
12
12
14
14
15
10
10
12
12
20
8
10
10
10
25
8
10
10
10
30
8
8
8
8
35
6
8
8
8
40
6
6
8
8
45
6
6
6
6
50
4
6
6
6
60
4
4
4
4
70
3
4
4
4
80
3
3
3
3
90
2
3
3
3
100
2
2
2
2
110
1
1
1
1
125
0
0
0
0
150
00
00
00
00
175
4.3 COPPER WIRE SIZE - AWG. (3% VOLTAGE DROP)
200 [61]
150 [46]
100 [30]
50 [15]
4.4 BLOWER MOTOR ELECTRICAL DATA
2421 1/3 208/230 1 60 300-1100 1.7 4.0 15
3621 1/2 208/230 1 60 300-1100 3.4 6.0 15
4824 3/4 208/230 1 60 300-1100 4.9 9.0 15
6024 3/4 208/230 1 60 300-1100 4.9 9.0 15
RHPL-HM HP Voltage Phase Hertz RPM Circuit
AMPS
Minimum
Circuit
Ampacity
Max. Circuit
Protector

RXBH - 1724?05J Single 208/240 1/60 3.6/4.8 17.3/20.0 1.7 25/30 24/28
2421 RXBH - 1724?07J Single 208/240 1/60 5.4/7.2 26.0/30.0 1.7 35/40 35/40
RXBH - 1724?10J Single 208/240 1/60 7.2/9.6 34.6/40.0 1.7 50/60 46/53
RXBH - 1724?05J Single 208/240 1/60 3.6/4.8 17.3/20.0 3.4 30/30 26/30
RXBH - 1724?07J Single 208/240 1/60 5.4/7.2 26.0/30.0 3.4 40/45 37/42
RXBH - 1724?10J Single 208/240 1/60 7.2/9.6 34.6/40.0 3.4 50/60 48/55
3621 Single 208/240 1/60 10.8/14.4 51.9/60.0 3.4 70/80 70/80
RXBH - 1724A15J MULTI. CKT 1 208/240 1/60 3.6/4.8 17.3/20.0 3.4 30/30 26/30
MULTI. CKT 2 208/240 1/60 7.2/9.6 34.6/40.0 0.0 45/50 44/50
Single 208/240 1/60 12.8/17 61.6/70.8 3.4 90/100 82/93
RXBH - 1724A18J MULTI. CKT 1 208/240 1/60 6.4/8.5 30.8/35.4 3.4 45/50 43/49
MULTI. CKT 2 208/240 1/60 6.4/8.5 30.8/35.4 0.0 40/45 39/45
RXBH - 1724?05J Single 208/240 1/60 3.6/4.8 17.3/20.0 4.9 30/35 28/32
RXBH - 1724?07J Single 208/240 1/60 5.4/7.2 26.0/30.0 4.9 40/45 39/44
RXBH - 1724?10J Single 208/240 1/60 7.2/9.6 34.6/40.0 4.9 50/60 50/57
Single 208/240 1/60 10.8/14.4 51.9/60.0 4.9 80/90 72/82
RXBH - 1724A15J MULTI. CKT 1 208/240 1/60 3.6/4.8 17.3/20.0 4.9 30/35 28/32
MULTI. CKT 2 208/240 1/60 7.2/9.6 34.6/40.0 0 45/50 44/50
Single 208/240 1/60 12.8/17 61.6/70.8 4.9 90/100 84/95
4824 RXBH - 1724A18J MULTI. CKT 1 208/240 1/60 6.4/8.5 30.8/35.4 4.9 45/60 45/51
MULTI. CKT 2 208/240 1/60 6.4/8.5 30.8/35.4 0 40/45 39/45
Single 208/240 1/60 14.4/19.2 69.2/80.0 4.9 100/110 93/107
RXBH - 24A20J MULTI. CKT 1 208/240 1/60 7.2/9.6 34.6/40.0 4.9 50/60 50/57
MULTI. CKT 2 208/240 1/60 7.2/9.6 34.6/40.0 0 45/50 44/50
Single 208/240 1/60 18.0/24.0 87.0/99.9 4.9 125/150 115/132
RXBH - 24A25J MULTI. CKT 1 208/240 1/60 6.0/8.0 29.0/33.3 4.9 45/50 43/48
(4-ton only) MULTI. CKT 2 208/240 1/60 6.0/8.0 29.0/33.3 0 40/45 37/42
MULTI. CKT 3 208/240 1/60 6.0/8.0 29.0/33.3 0 40/45 37/42
RXBH - 1724?07J Single 208/240 1/60 5.4/7.3 26.0/30.0 4.9 40/45 39/44
RXBH - 1724?10J Single 208/240 1/60 5.4/7.2 26.0/30.0 4.9 40/45 39/44
Single 208/240 1/60 10.8/14.4 51.9/60.0 4.9 80/90 72/82
RXBH - 1724A15J MULTI. CKT 1 208/240 1/60 3.6/4.8 17.3/20.0 4.9 30/35 28/32
MULTI. CKT 2 208/240 1/60 7.2/9.6 34.6/40.0 0 45/50 44/50
Single 208/240 1/60 12.8/17 61.6/70.8 4.9 90/100 84/95
RXBH - 1724A18J MULTI. CKT 1 208/240 1/60 6.4/8.5 30.8/35.4 4.9 45/60 45/51
MULTI. CKT 2 208/240 1/60 6.4/8.5 30.8/35.4 0 40/45 39/45
Single 208/240 1/60 14.4/19.2 69.2/80.0 4.9 100/110 93/107
6024 RXBH - 24A20J MULTI. CKT 1 208/240 1/60 7.2/9.6 34.6/40.0 4.9 50/60 50/57
MULTI. CKT 2 208/240 1/60 7.2/9.6 34.6/40.0 0 45/50 44/50
Single 208/240 1/60 18.0/24.0 87.0/99.9 4.9 125/150 115/132
MULTI. CKT 1 208/240 1/60 6.0/8.0 29.0/33.3 4.9 45/50 43/48
RXBH - 24A25J MULTI. CKT 2 208/240 1/60 6.0/8.0 29.0/33.3 0 40/45 37/42
MULTI. CKT 3 208/240 1/60 6.0/8.0 29.0/33.3 0 40/45 37/42
RXBH-24A30J Single 208/240 1/60 21.6/28.8 103.8/120. 4.9 136/156 150/175
MULTI. CKT 1 208/240 1/60 7.2/9.6 34.6/40.0 4.9 49/56 50/60
RXBH-24A30J MULTI. CKT 2 208/240 1/60 2-4.8 34.6/40.0 0 44/50 45/50
MULTI. CKT 3 208/240 1/60 7.2/9.6 34.6/40.0 0 44/50 45/50
RHPL-HM Manufacturer
Model Number Type Supply Circuit Voltage PH/HZ Heater
kW Heater AMPS Motor Ampacity Maximum
Circuit
Protection
Minimum
Circuit
Ampacity
4.5 ELECTRIC HEAT ELECTRICAL DATA
NOTES:
•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 (230V) signal phase air handler is designed to be used with single or three phase 230 volt electric heaters. In the case of connecting
3-phase power to the air handler terminal block without the heater, bring only two leads to the terminal block. Cap, insulate and fully secure the
third lead.
• ?Heater kit type A=Breaker B=Terminal Block C=Pullout Disconnect
nstallation of the UL Listed original equipment manufacturer provided heater kits listed in the table below is
recommended for all auxiliary heating requirements.
14

5.0 AIR HANDLER Comfort Control2System™
INTERFACE BOARD
The RHPL-series of air handlers are designed to operate with conventional 24VAC con-
trols or with a serial communicating system.
or the Comfort Control2System™, you must have:
• An air handler equipped with the Comfort Control2System™
• A condensing unit or heat pump equipped with Comfort Control2System™
• A Comfort Control2thermostat
If your equipment does not meet this criteria, you must wire it using conventional 24VAC
thermostat control wiring. Reference Section 5.11.
5.1 Comfort Control2CONTROL WIRING
The Comfort Control2requires four (4) control wires for unit operation:
R – 24VAC
C – 24VAC common
1 – Data wire 1
2 – Data wire 2
Wiring sizing for Comfort Control2is identical to systems using low voltage 24V wires.
NNoottee::Comfort Control2requires a minimum 18 AWG.
MPORTANT: When using Comfort Control2, do not make any connections to the
24VAC thermostat wires. If any connections are made to the G, W1, W2, Y1, Y2, B, or
ODD wires, the Comfort Control2control will assume the control is being used with a tra-
ditional thermostat and will IGNORE ANY COMMUNICATIONS USING DATA WIRE 1
AND DATA WIRE 2.
MPORTANT: 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.
• The four 18AWG low voltage control wires must be installed from the thermostat to the
indoor unit and from indoor unit to the outdoor unit. The wire length between the ther-
mostat and indoor unit should not be greater than 100 feet. The wire length between
the indoor unit and outdoor unit should not be greater than 125 feet.
• Low voltage control connections are made by extending wires from top of air handler
using wire nuts.
• See wiring diagrams attached to indoor and outdoor sections to be connected.
F GURE 8
THE A R HANDLER CONTROL BOARD EQU PPED W TH THE Comfort Control2System™
15
Comfort Control2System™ CONTROL WIRING

16
• Do not leave excess field control wiring inside unit, pull excess control wire to outside
of unit and provide strain relief for field wiring on inside of cabinet at point wiring pene-
trates cabinet.
• Make sure, after installation, separation of control wiring and power wiring has been
maintained.
5.2 Comfort Control2System™ CONTROL BOARD
The RHPL series air handler control, igure 8, has the following features:
• Memory Card – The memory card stores all information needed for unit operation.
Once the system is wired for serial communications, this information is shared with the
thermostat and outdoor unit. This shared data is available if one of the components in
the system needs to be replaced.
• An automotive-style ATC blade fuse for transformer protection (3 amp).
• An on-board LED to indicate blower C M.
• An RJ-11 port for use with a diagnostic tool.
• Inputs for field installed supply and return air temperature sensors (available in kit
RXHT-A01)
• DIP switches for airflow adjustments
MPORTANT: The DIP switches are NOT used when the air handler is wired for serial
communications. Airflow adjustments are performed via the thermostat or a diagnostic
tool.
nstallation Verification
• Term and bias dip switches should be on.
• 24V AC power on R&C must be present at the control for the air handler to operate,
reference igure 9.
• Line voltage must be present at the control for indoor blower operation.
• The RX Data LED will flash green in normal operation. A flashing green light indicates
24VAC is present and the data wires 1 and 2 are wired properly.
MPORTANT: Diagnostic port is for the diagnostic tool only. Do not attempt to connect
components using a telephone cord. Damage will occur.
MPORTANT: Diagnostic port is not a phone jack. Connecting to a telephone or tele-
phone system will result in damage.
5.3 USING THE ON-BOARD LED TO DETERMINE BLOWER CFM
The C M LED indicates blower output by flashing one (1) flash for every 100 C M of
airflow. The LED will pause 1/10 second between each flash.
5.4 AIRFLOW ADJUSTMENTS WITH THE Comfort Control2System™
The RHPL air handler Comfort Control2System™ may operate using the Comfort
Control2or via traditional thermostat wiring. When the air handler is wired for the
Comfort Control2using Data wire 1 and Data wire 2, the DIP switches on the Comfort
Control2control have NO affect on the airflow.
F GURE 9
TYP CAL The Comfort Control2System™ W R NG D AGRAM
Indoor Unit
1
2
C
R
WIRING INFORMATION
Line Voltage
–Field Installed - - - - - -
–Factory Standard
12RC
1
2
R
C
Communicating Thermostat
Outdoor Unit
Comfort Control2System™ CONTROL WIRING

17
MPORTANT: When using the Comfort Control2, the DIP switches have no affect on
airflow or on air handler performance.
5.5 COOLING AIRFLOW SETTINGS (BY TONNAGE)
The RHPL-series of air handlers automatically set cooling airflow when using the
Comfort Control2System™. The air handler detects the tonnage of the condensing
unit/heat pump and sets airflow for optimum performance and comfort. Refer to Table 2
for the airflow provided when the RHPL air handler is matched to the (-)PRL heat pump.
5.6 COOLING AIRFLOW ADJUSTMENT
The Comfort Control2System™ control board does allow the installer to tweak the cool-
ing airflow +/-10% to suit the installation. When using the Comfort Control2System™,
the airflow can only be adjusted using the serial communicating thermostat or a service
tool. To adjust the airflow, go to the airflow adjustment menu and select the desired
adjustment. (Reference Table 2.)
MPORTANT: Cooling airflow adjustment is accessible via the Comfort Control2ther-
mostat or via a service tool. Refer to their instructions to access the cooling airflow
adjustment menu.
NOTE: Cooling airflow adjustments are in effect for cooling operation only. They are
ignored when in heating mode or when electric heat is activated.
5.7 HEATING AIRFLOW ADJUSTMENT
The Comfort Control2control does allow the installer to tweak the heating airflow +/-10%
to suit the installation. When using Comfort Control2System™, the airflow can only be
adjusted using the Comfort Control2thermostat or a service tool. To adjust the airflow,
go to the airflow adjustment menu and select the desired adjustment. (Reference Table 3.)
MPORTANT: Heating airflow adjustment is accessible via the Comfort Control2ther-
mostat or via a service tool. Refer to their instructions to access the heating airflow
adjustment menu.
NOTE: Heating airflow adjustments are in effect for heat pump operation only. They
are ignored when in cooling mode or when electric heat is activated.
TABLE 1
RHPL A RFLOW WHEN MATCHED TO THE (-)PRL HEAT PUMP
3
•The RX Data LED will flash green in standby mode. Standby mode indicates 24VAC is
present and the data wires 1 and 2 are wired properly and there is not a command for unit
operation from the serial communicating thermostat.
IMPORTANT: If the RX DATA LED is solid green, data wire 1 and data wire 2 are not
properly connected. Typically, the connections are switched, i.e. data wire 1 is wired to the
data wire 2 connection and data wire 2 is wired to the data wire 1 connection. Verify wiring
and correct the polarity at the two data wires.
5.3 Using the On-Board LED to Determine Blower CFM
The (-)HPL interface board LED indicates blower output by flashing one (1) second for every
100 CFM of airflow. The LED will pause 1/10 second between each flash. After the blower
CFM has been displayed, the LED will illuminate dimly for 10 seconds before repeating the
sequence. (See Table 1.)
5.4 Airflow Adjustments with Serial Communications
The (-)HPL air handler serial communicating control is configured to provide air handler
operation using serial communications or via traditional thermostat wiring. When the air handler
is wired for serial communications using Data wire 1 and Data wire 2, the DIP switches on the
serial communicating control have NO affect on the airflow.
IMPORTANT: When using serial communications, the DIP switches have no affect or airflow
or on air handler performance.
5.5 Cooling Airflow Settings (by tonnage)
The (-)HPL-series of air handlers automatically set cooling airflow when using serial
communications. The air handler detects the tonnage of the condensing unit/heat pump and sets
airflow for optimum performance and comfort. Refer to table X.X for the airflow provided with
the (-)HPL air handler is matched to the (-)PRL heat pump.
Airflow (cfm)
Tonnage of heat
pump 2nd
Stage 1
st Stage
(-)PRL-024JEC 775 625
(-)PRL-036JEC 1200 875
(-)PRL-048JEC 1625 1200
(-)PRL-060JEC 1675 1375
Table X.X – (-)HPL airflow when matched to the (-)PRL heat pump.
5.6 Cooling Airflow Adjustment
The serial communicating control does allow the installer to tweak the cooling airflow +/-10% to
suit the installation. When using serial communications, the airflow can only be adjusted using
the serial communicating thermostat or a service tool. To adjust the airflow, go to the airflow
adjustment menu and select the desired adjustment (reference table X.X).
TABLE 2
A RFLOW ADJUSTMENT SELECT ON TABLE
4
Selection
None
+10%
-10%
Table X.X – Airflow Adjustment Selection Table.
IMPORTANT: Cooling airflow adjustment is accessible via the serial communicating
thermostat or via a service tool. Refer to their instructions to access the cooling airflow
adjustment menu.
NOTE: Cooling airflow adjustments are in effect for cooling operation only. They are ignored
when in heating mode or when electric heat is activated.
5.7 Heating Airflow Adjustment
The serial communicating control does allow the installer to tweak the heating airflow +/-10% to
suit the installation. When using serial communications, the airflow can only be adjusted using
the serial communicating thermostat or a service tool. To adjust the airflow, go to the airflow
adjustment menu and select the desired adjustment (reference table X.X).
Selection
None
+10%
-10%
Table X.X – Airflow Adjustment Selection Table.
IMPORTANT: Heating airflow adjustment is accessible via the serial communicating
thermostat or via a service tool. Refer to their instructions to access the heating airflow
adjustment menu.
NOTE: Heating airflow adjustments are in effect for heat pump operation only. They are
ignored when in cooling mode or when electric heat is activated.
5.7 Electric Heat Airflow
The (-)HPL-series of air handlers are factory programmed to provide adequate airflow for
electric heat (auxiliary heat). Airflow for electric heat is fixed and cannot be field adjusted.
Electric Heat AirflowThermostat
Input 2-ton 3-ton 4-ton 5-ton
W1 or W2 800 CFM 1200 CFM 1600 CFM 1800 CFM
5.8 Cooling Mode Dehumidification
TABLE 3
A RFLOW ADJUSTMENT SELECT ON TABLE
4
Selection
None
+10%
-10%
Table X.X – Airflow Adjustment Selection Table.
IMPORTANT: Cooling airflow adjustment is accessible via the serial communicating
thermostat or via a service tool. Refer to their instructions to access the cooling airflow
adjustment menu.
NOTE: Cooling airflow adjustments are in effect for cooling operation only. They are ignored
when in heating mode or when electric heat is activated.
5.7 Heating Airflow Adjustment
The serial communicating control does allow the installer to tweak the heating airflow +/-10% to
suit the installation. When using serial communications, the airflow can only be adjusted using
the serial communicating thermostat or a service tool. To adjust the airflow, go to the airflow
adjustment menu and select the desired adjustment (reference table X.X).
Selection
None
+10%
-10%
Table X.X – Airflow Adjustment Selection Table.
IMPORTANT: Heating airflow adjustment is accessible via the serial communicating
thermostat or via a service tool. Refer to their instructions to access the heating airflow
adjustment menu.
NOTE: Heating airflow adjustments are in effect for heat pump operation only. They are
ignored when in cooling mode or when electric heat is activated.
5.7 Electric Heat Airflow
The (-)HPL-series of air handlers are factory programmed to provide adequate airflow for
electric heat (auxiliary heat). Airflow for electric heat is fixed and cannot be field adjusted.
Electric Heat AirflowThermostat
Input 2-ton 3-ton 4-ton 5-ton
W1 or W2 800 CFM 1200 CFM 1600 CFM 1800 CFM
5.8 Cooling Mode Dehumidification
Comfort Control2System™ CONTROL WIRING

5.8 ELECTRIC HEAT AIRFLOW
The RHPL-series of air handlers are factory programmed to provide adequate airflow for
the maximum electric heat (auxiliary heat) allowed for a given model. Airflow adjustment
for lower KW heater applications is accessible via the Comfort Control2System thermo-
stat or via a service tool. Refer to their instructions to access the “Heating Airflow
Adjustment” menu.
5.9 COOLING MODE DEHUMIDIFICATION
The serial communicating control is shipped with “On Demand Dehumidification” (ODD)
turned O . On Demand Dehumidification may be activated from the serial communicating
thermostat when the serial communicating thermostat has an on-board humidity sensor.
MPORTANT: On Demand Dehumidification is accessible via the serial communicating
thermostat or via a service tool. Refer to their instructions to access the ODD airflow
adjustment menu.
5.10 COOLING DELAY PROFILES
The RHPL air handler is factory configured with optimum ON/O delays to maximize
energy efficiency and comfort. In certain situations, the installer may choose an alternate
profile to tweak the system operation for the building load and to maximize comfort. The
alternate profiles are defined below:
MPORTANT: On Demand Dehumidification, ODD, is the preferred method to maximize
comfort with little or no loss of energy efficiency. If using ODD, do NOT use any of the
alternate profiles. Only use the factory default profile. Use of the alternate profiles with
ODD will decrease energy efficiency with no gain in comfort.
Profile A – Factory default profile.
Profile B – Quiet Start profile
The Quiet Start profile is configured to bring the blower up to 50% airflow for 30 seconds
before advancing to 100% airflow. This helps to minimize the blower noise at system
startup.
Profile C – Humid profile
The humid profile is configured to run the blower at 80% airflow for about the first four
minutes of system operation to remove more moisture from the conditioned space.
18
Comfort Control2System™ CONTROL WIRING
On Delay
Air Handler Delay Duration
(second) % Rated Airflow Off Delay (seconds)
RHPL-HM2421 No Delay N/A 45
RHPL-HM3621 No Delay N/A 45
RHPL-HM4824 No Delay N/A 45
RHPL-HM6024 No Delay N/A 45
On Delay
Air Handler Delay Duration
(second) % Rated Airflow Off Delay (seconds)
RHPL-HM2421 30 50 15
RHPL-HM3621 30 50 15
RHPL-HM4824 30 50 15
RHPL-HM6024 30 50 15
On Delay
Air Handler Delay Duration
(second) % Rated Airflow Off Delay (seconds)
RHPL-HM2421 255 80 0
RHPL-HM3621 255 80 0
RHPL-HM4824 255 80 0
RHPL-HM6024 255 80 0
TABLE 4
ELECTR C HEAT A RFLOW FOR THE RHPL- A R HANDLERS
TABLE 5
ODD TERM NAL
INDOOR INPUT TO “ODD”
AMBIENT TERMINAL
CONDITION (FROM HUMIDISTAT)
HIGH HUMIDITY Ø VAC
LOW HUMIDITY 24 VAC
Air Handler
Model Above
15KW: 15KW and below:
RHPL-HM2421JC 800 C M 600 C M
RHPL-HM3621JC 1200 C M 600 C M
RHPL-HM4824JC 1600 C M 800 C M
RHPL-HM6024JC 1800 C M 800 C M

19
B
W2
W1
B
C
G
(-)HPL Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
(-)PRL
Heat Pump
Outdoor
Unit
Y2
C
R
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2 GW2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
*
F GURE 10
TYP CAL 2-STAGE THERMOSTAT: (-)PRL HEAT PUMP W TH
ELECTR C HEAT
F GURE 11
TYP CAL TWO-STAGE THERMOSTAT: (-)PRL HEAT PUMP W TH
ELECTR C HEAT US NG A HUM D STAT FOR DEHUM D F CAT ON*.
B
W2
W1
B
C
G
(-)HPL Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
(-)PRL
Heat Pump
Outdoor
Unit
Y2
C
R
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2 GW2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
Humidistat
*
F GURE 12
TYP CAL TWO-STAGE THERMOSTAT: (-)PRL HEAT PUMP W TH
ELECTR C HEAT US NG A TWO-STAGE THERMOSTAT W TH
DEHUM D F CAT ON*
B
W2
W1
B
C
G
(-)HPL Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
(-)PRL
Heat Pump
Outdoor
Unit
Y2
C
R
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2 GW2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
DHM
*
B
W2
W1
B
C
G
(-)HPL Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
(-)PRL
Heat Pump
Outdoor
Unit
Y2
C
R
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2 GW2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
DHM
L
*
F GURE 13
(-)PRL HEAT PUMP W TH ELECTR C HEAT US NG A TWO-STAGE
THERMOSTAT W TH DEHUM D F CAT ON* AND A MALFUNCT ON
L GHT
W RE COLOR CODE
BK – BLACK G – GREEN PR – PURPLE Y – YELLOW
BR – BROWN GY – GRAY R – RED
BL – BLUE O – ORANGE W – WHITE
S1
S2
S3
S4
S5
S6
S7
S8
S1
S2
S3
S4
S5
S6
S7
S8
*See Section 5.17 for proper DIP switch selection.
D P SW TCH POS T ONS D P SW TCH POS T ONS
ON
OFF
S1
S2
S3
S4
S5
S6
S7
S8
D P SW TCH POS T ONS
S1
S2
S3
S4
S5
S6
S7
S8
D P SW TCH POS T ONS
*See Section 5.17 for proper DIP switch selection. *See Section 5.17 for proper DIP switch selection.
ON
OFF
ON
OFF
ON
OFF
CONVENTIONAL THERMOSTAT WIRING
* When using
13kW and higher
it is recommitted
to jump W1and W2
together for
maximum
temperature rise.
* When using
13kW and higher
it is recommitted
to jump W1and W2
together for
maximum
temperature rise.
* When using
13kW and higher
it is recommitted
to jump W1and W2
together for
maximum
temperature rise.
* When using
13kW and higher
it is recommitted
to jump W1and W2
together for
maximum
temperature rise.

CONVENTIONAL THERMOSTAT WIRING
20
W2
C
R
(-)HPL Air
Handler
Single-Stage A/C Thermostat
C
-Field Installed
Line Voltage
WIRING INFORMATION
-Factory Standard
ODD
B
Y1
G
R
Y
C
W1
G
Y2
WY
W/BL
G/BK
Y
W/BK
BL
G/Y
BR
R
Y/BL
F GURE 14
TYP CAL S NGLE-STAGE THERMOSTAT: S NGLE STAGE STRA GHT
COOL NG W TH ELECTR C HEAT
Y1 ASC FLOW
F GURE 15
TYP CAL S NGLE-STAGE THERMOSTAT: S NGLE STAGE STRA GHT
COOL NG W TH ELECTR C HEAT AND US NG A HUM D STAT FOR
DEHUM D F CAT ON
Y1 A R FLOW
G
W2
C
R
(-)HPL Air
Handler
Single-Stage A/C Thermostat
A/C Outdoor Unit
C
Y
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
B
Y1
WY
R
C
Y
W/BL
Humidistat
G
W1
Y2
G/BK
W/BK
BL
G/Y
BR
R
Y/BL
F GURE 16
TYP CAL S NGLE-STAGE THERMOSTAT: S NGLE STAGE STRA GHT
COOL NG W TH ELECTR C HEAT
Y2 A R FLOW
G
W2
C
R
(-)HPL Air
Handler
Single-Stage A/C Thermostat
A/C Outdoor Unit
C
Y
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
B
Y1
WY
R
C
Y
W/BL
G
W1
Y2
G/BK
W/BK
BL
G/Y
BR
R
Y/BL
G
W2
C
R
(-)HPL Air
Handler
Single-Stage A/C Thermostat
A/C Outdoor Unit
C
Y
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
B
Y1
WY
R
C
Y
W/BL
Humidistat
G
W1
Y2
G/BK
W/BK
BL
G/Y
BR
R
Y/BL
F GURE 17
TYP CAL S NGLE-STAGE THERMOSTAT: S NGLE STAGE
STRA GHT COOL NG W TH ELECTR C HEAT AND US NG A
HUM D STAT FOR DEHUM D F CAT ON
Y2 A R FLOW
W RE COLOR CODE
BK – BLACK G – GREEN PR – PURPLE Y – YELLOW
BR – BROWN GY – GRAY R – RED
BL – BLUE O – ORANGE W – WHITE