Rheem RARL-JEC User manual

92-101691-04-01
SUP RS D S 92-101691-04-00
A R-COOLED CONDENS NG UN TS
(-)ARL-JEC 16 SEER
EQU PPED W TH THE COMFORT CONTROL
2
SYSTEM™
NSTALLAT ON NSTRUCT ONS
[ ] ND CATES METR C CONVERS ONS
ISO 9001:2000
F aturing Earth-Fri ndly
R-410A R frig rant

TABLE OF CONTENTS
1.0 SAFETY NFORMATON............................................3
2.0 GENERAL NFORMATON ..........................................5
2.1 CheckingProductReceived ....................................5
2.2 Application..................................................5
2.3 Dimensions .................................................6
2.4 lectricalandPhysicalData ....................................6
2.5 ProperInstallation............................................7
3.0 LOCATNGUNT..................................................7
3.1 Corrosive nvironment ........................................7
3.2 CondenserLocation...........................................7
3.3 OperationalIssues............................................8
3.4 For Condensers With Space Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 CustomerSatisfactionIssues ...................................8
3.6 UnitMounting................................................8
3.7 Factory-Preferred Tie-Down Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 REFRGERANTCONNECTONS .....................................9
4.1 Tools Required for Installing & Servicing R-410A Models . . . . . . . . . . . . . . 9
4.2 SpecificationsofR-410A......................................10
4.3 Quick Reference Guide for R-410-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.0 REPLACEMENTUNTS............................................11
6.0 NDOORCOL ...................................................11
6.1 Location...................................................11
7.0 NTERCONNECTNGTUBNG ......................................11
7.1 VaporandLiquidLines .......................................11
7.2 MaximumLengthofLines.....................................12
7.3 Outdoor Unit Installed Above or Below Indoor Coil . . . . . . . . . . . . . . . . . . 12
7.4 TubingInstallation...........................................13
7.5 TubingConnections..........................................15
7.6 LeakTesting ...............................................15
8.0 COMPRESSOR CRANKCASE HEAT (CCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.0 HARDSTARTCOMPONENTS......................................16
10.0 H GH AND LOW PRESSURE CONTROLS (HPC AND LPC). . . . . . . . . . . . . . . 16
10.1 vacuationProcedure........................................16
11.0 CONDENS NG UN TS EQU PPED W TH THE COMFORT CONTROL2
SYSTEM™ ......................................................17
11.1 ControlDescription ..........................................17
11.2 Comfort Contro 2System™ ControlWiring........................18
11.3 Comfort Contro 2System™ ICC Control Operation. . . . . . . . . . . . . . . . . . 18
11.4 Active Compressor Protection Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11.5 TestandFaultRecallModes...................................22
11.6 ICCDiagnosticCodes .....................................24-27
11.7 Conventional 24VAC Thermostat Control Wiring . . . . . . . . . . . . . . . . . . . 27
11.8 Typical Non-Communicating Thermostat Wiring Diagrams. . . . . . . . . . . . 28
11.9 ICC Control Operation with Conventional Thermostat Wiring . . . . . . . . . . 29
11.10 Active Compressor Protection Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.11 TestandFaultRecallModes...................................31
12.0 ELECTRCALWRNG.............................................33
12.1 PowerWiring...............................................33
12.2 Grounding .................................................33
12.3 ControlWiring ..............................................33
13.0 START-UPANDPERFORMANCE...................................34
14.0 CHECKNGARFLOW.............................................34
15.0 CHECKNGREFRGERANTCHARGE................................34
15.1 Charging Units With R-410A Refrigerant. . . . . . . . . . . . . . . . . . . . . . . . . . 35
15.2 ChargingByLiquidPressure...................................35
15.3 ChargingByWeight..........................................35
15.4 FinalLeakTesting...........................................35
16.0 ACCESSORES..................................................36
16.1 Remote Outdoor Temperature Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
17.0 TROUBLESHOOTNG.............................................36
17.1 Comfort Contro 2System™ InitialStartup.........................36
17.2 Replacement of Comfort Contro 2System™ Control Board . . . . . . . . . . . 37
17.3 lectricalChecksFlowChart...................................38
17.4 Cooling Mechanical Checks Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . 39
17.5 General Trouble Shooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
17.6 ServiceAnalyzerCharts....................................41-45
17.7 SubcoolingCalculation .......................................46
18.0 WRNGDAGRAMS............................................47-48
2

Continued on next page ➜
3
1.0 SAFETY INFORMATION
!WARNING
THESE NSTRUCT ONS ARE NTENDED AS AN A D TO QUAL F ED, L CENSED
SERV CE PERSONNEL FOR PROPER NSTALLAT ON, ADJUSTMENT AND
OPERAT ON OF TH S UN T. READ THESE NSTRUCT ONS THOROUGHLY
BEFORE ATTEMPT NG NSTALLAT ON OR OPERAT ON. FA LURE TO FOL-
LOW THESE NSTRUCT ONS MAY RESULT N MPROPER NSTALLAT ON,
ADJUSTMENT, SERV CE OR MA NTENANCE POSS BLY RESULT NG N F RE,
ELECTR CAL SHOCK, PROPERTY DAMAGE, PERSONAL NJURY OR DEATH.
!WARNING
THE MANUFACTURER’S WARRANTY DOES NOT COVER ANY DAMAGE OR
DEFECT TO THE A R COND T ONER CAUSED BY THE ATTACHMENT OR USE
OF ANY COMPONENTS, ACCESSOR ES OR DEV CES (OTHER THAN THOSE
AUTHOR ZED BY THE MANUFACTURER) NTO, ONTO OR N CONJUNCT ON
W TH THE A R COND T ONER. YOU SHOULD BE AWARE THAT THE USE OF
UNAUTHOR ZED COMPONENTS, ACCESSOR ES OR DEV CES MAY
ADVERSELY AFFECT THE OPERAT ON OF THE A R COND T ONER AND MAY
ALSO ENDANGER L FE AND PROPERTY. THE MANUFACTURER D SCLA MS
ANY RESPONS B L TY FOR SUCH LOSS OR NJURY RESULT NG FROM THE
USE OF SUCH UNAUTHOR ZED COMPONENTS, ACCESSOR ES OR DEV CES.
!WARNING
D SCONNECT ALL POWER TO UN T BEFORE START NG MA NTENANCE.
FA LURE TO DO SO CAN CAUSE ELECTR CAL SHOCK RESULT NG N
SEVERE PERSONAL NJURY OR DEATH.
!WARNING
DO NOT USE OXYGEN TO PURGE L NES OR PRESSUR ZE SYSTEM FOR
LEAK TEST. OXYGEN REACTS V OLENTLY W TH O L, WH CH CAN
CAUSE AN EXPLOS ON RESULT NG N SEVERE PERSONAL NJURY OR
DEATH.
!WARNING
THE UN T MUST BE PERMANENTLY GROUNDED. FA LURE TO DO SO
CAN CAUSE ELECTR CAL SHOCK RESULT NG N SEVERE PERSONAL
NJURY OR DEATH.
!WARNING
TURN OFF ELECTR C POWER AT THE FUSE BOX OR SERV CE PANEL
BEFORE MAK NG ANY ELECTR CAL CONNECT ONS.
ALSO, THE GROUND CONNECT ON MUST BE COMPLETED BEFORE
MAK NG L NE VOLTAGE CONNECT ONS. FA LURE TO DO SO CAN
RESULT N ELECTR CAL SHOCK, SEVERE PERSONAL NJURY OR
DEATH.

4
!CAUTION
UN T MAY START SUDDENLY AND W THOUT WARN NG
Solid red light indicates a thermostat call for unit operation is present at
the CC control. CC control will attempt to start unit after short cycle timer
expires or when in Active Protection mode will attempt to restart unit prior
to Lockout mode.
!CAUTION
UN T MAY START SUDDENLY AND W THOUT WARN NG
Solid red light indicates a thermostat call for unit operation is present at the
CC. CC will attempt to start unit after short cycle timer expires or when in
Active Protection mode will attempt to restart unit prior to Lockout mode.
!CAUTION
THE TOP OF THE SCROLL COMPRESSOR SHELL S HOT. TOUCH NG THE
COMPRESSOR TOP MAY RESULT N SER OUS PERSONAL NJURY.
!CAUTION
R-410A PRESSURES ARE APPROX MATELY 60% H GHER THAN R-22
PRESSURES. USE APPROPR ATE CARE WHEN US NG TH S REFR GER-
ANT. FA LURE TO EXERC SE CARE MAY RESULT N EQU PMENT DAM-
AGE, OR PERSONAL NJURY.
!CAUTION
THE COMPRESSOR HAS AN NTERNAL OVERLOAD PROTECTOR. UNDER
SOME COND T ONS, T CAN TAKE UP TO 2 HOURS FOR TH S OVERLOAD
TO RESET. MAKE SURE OVERLOAD HAS HAD T ME TO RESET BEFORE
CONDEMN NG THE COMPRESSOR.
!CAUTION
Only use evaporators approved for use on R-410A systems. Use of existing
R-22 evaporators can introduce mineral oil to the R-410A refrigerant form-
ing two different liquids and decreasing oil return to the compressor. This
can result in compressor failure.
!CAUTION
When coil is installed over a finished ceiling and/or living area, it is
recommended that a secondary sheet metal condensate pan be
constructed and installed under entire unit. Failure to do so can result
in property damage.
!
CAUTION
R-410A syst ms op rat at high r pr ssur s than R-22 syst ms. Do not us
R-22 s rvic quipm nt or compon nts on R-410A quipm nt.

2.0 GENERAL INFORMATION
The (-)ARL-series of condensing units are designed to operate using the Comfort
Contro 2or traditional 24VAC controls. These units are equipped with Comfort
Contro 2. To take full advantage of the Comfort Contro 2System™, the preferred
method of installation is using the Comfort Contro 2. Your installation must have
these components to use the Comfort Contro 2:
•(-)ARL condensing unit equipped with Comfort Contro 2
• An air handler or furnace equipped with Comfort Contro 2
• A Comfort Contro 2thermostat
If your installation does not meet the above requirements, you must use traditional
24VAC controls.
This installation instruction manual contains complete instructions for installation
and setup using Comfort Contro 2or conventional 24VAC controls. Please refer to
the engineering Specification Sheets for complete performance data, thermostat,
and accessory listings.
The information contained in this manual has been prepared to assist in the proper
installation, operation and maintenance of the air conditioning system. Improper
installation, or installation not made in accordance with these instructions, can
result in unsatisfactory operation and/or dangerous conditions (noise and compo-
nent failure), and can cause the related warranty not to apply.
Read this manual and any instructions packaged with separate equipment required
to make up the system prior to installation. Retain this manual for future reference.
To achieve optimum efficiency and capacity, the indoor cooling coils listed in the
condensing unit specification sheet should be used.
2.1 CHECKING PRODUCT RECEIVED
Upon receiving unit, inspect it for any shipping damage. Claims for damage, either
apparent or concealed, should be filed immediately with the shipping company.
Check condensing unit model number, electrical characteristics and accessories to
determine if they are correct. Check system components (evaporator coil, condens-
ing unit, evaporator blower, etc.) to make sure they are properly matched.
2.2 APPLICATION
Before specifying any air conditioning equipment, a survey of the structure and a
heat gain calculation must be made. A heat gain calculation begins by measuring
all external surfaces and openings that gain heat from the surrounding air and
quantifying that heat gain. A heat gain calculation also calculates the extra heat
load caused by sunlight and by humidity removal.
Air conditioning systems are sized on the cooling load calculation. There are two
capacities that enable the equipment to provide comfort. The first is sensible capacity.
Sensible heat is the heat energy measured on the dry bulb thermometer as it is
added or removed.
The second form of heat is called latent or hidden heat. This is heat held in the
humidity in the air.
A properly-sized unit removes both forms of heat, producing a comfortable living
space. An oversized system cycles on and off too quickly and does not properly
remove humidity, producing an uncomfortable living space. Select the indoor and
outdoor equipment combination based on the manufacturer’s engineering data.
After the equipment combination has been selected, satisfying both sensible and
latent conditioning requirements, the system must be properly installed. Only then
can the unit provide the comfort the manufacturer intends.
There are several factors that the installers must consider:
• Outdoor unit location • Proper equipment evacuation
• System refrigerant charge • Indoor unit airflow
• Indoor unit blower speed • Supply and return air duct design and sizing
• System air balancing • Diffuser and return air grille location and sizing
!WARNING
THE MANUFACTURER’S WAR-
RANTY DOES NOT COVER ANY
DAMAGE OR DEFECT TO THE
A R COND T ONER CAUSED BY
THE ATTACHMENT OR USE OF
ANY COMPONENTS. ACCES-
SOR ES OR DEV CES (OTHER
THAN THOSE AUTHOR ZED BY
THE MANUFACTURER) NTO,
ONTO OR N CONJUNCT ON
W TH THE A R COND T ONER.
YOU SHOULD BE AWARE THAT
THE USE OF UNAUTHOR ZED
COMPONENTS, ACCESSOR ES
OR DEV CES MAY ADVERSELY
AFFECT THE OPERAT ON
OF THE A R COND T ONER AND
MAY ALSO ENDANGER L FE
AND PROPERTY. THE MANUFAC-
TURER D SCLA MS ANY
RESPONS B L TY FOR SUCH
LOSS OR NJURY RESULT NG
FROM THE USE OF SUCH
UNAUTHOR ZED COMPONENTS,
ACCESSOR ES OR DEV CES.
MATCH ALL COMPONENTS:
• OUTDOOR UN T
• NDOOR CO L/METER NG DEV CE
• NDOOR A R HANDLER/FURNACE
• REFR GERANT L NES
5

F GURE 1
D MENS ONS AND NSTALLAT ON CLEARANCES UN T MODEL NUMBER EXPLANAT ON
(-)ARL – 036 J C
C = QUIPP D WITH TH
COMFORT CONTROL2SYSTEM™
J-208/230-1-60
(NOMINAL CAPACITY)
024 = 24000 BTU/HR
036 = 36000 BTU/HR
048 = 48000 BTU/HR
060 = 60000 BTU/HR
L = D SIGN S RI S (R-410A)
R = 16 S R
A= R MOT COND NSING UNIT
TRAD NAM
AIR INLETS
(LOUVERS)
ALLOW 120[305 mm]
MIN. CLEARANCE
3 SIDES
AIR DISCHARGE
ALLOW 600[1524 mm] CLEARANCE
ALLOW 240[610 mm]
ACCESS CLEARANCE
ACCESS
PANEL
L
W
H
ALTERNATE HIGH VOLTAGE
CONNECTION (KNOCKOUT)
1 11/320[34 mm]
SERVICE
FITTINGS
LOW VOLTAGE
CONNECTION
7/8" [22 mm]
HIGH VOLTAGE
CONNECTION
111/32" [34 mm]
LIQUID LINE
CONNECTION
SERVICE ACCESS
TO ELECTRICAL &
VALVES ALLOW
24" [610 mm]
CLEARANCE
ONE SIDE
27/8" [73 mm] DIA.
ACCESSORY
KNOCKOUTS
VAPOR LINE
CONNECTION
A-00002
BASE PAN
ALLOW 24" [610 mm]
ACCESS CLEARANCE
ALTERNATE LINE VOLTAGE
ENTRY (KNOCKOUT)
111⁄32" [34 MM]
CONNECT THE LINE
VOLTAGE CONDUIT TO
THE BOTTOM OF THE
CONTROL BOX
AIR INLETS
(LOUVERS)
ALLOW 6” [1 2 mm]
MIN. CLEARANCE
3SIDES
ACCESS
PANEL
AIR DISCHARGE
ALLOW 60" [1 24 mm] CLEARANCE
TABLE 1
(-)ARL-JEC ELECTR CAL DATA
Mo el
Number
Phase
Frequency
(Hz)
Voltage
(Volts)
Compressor Fan
Motor
(FLA)
Min. Circuit
Ampacity
Amperes
Fuse or HACR
Circuit Breaker
Out oor Coil Weight
Min.
Amperes
Max.
Amperes
Face Area
Sq. Ft. [m2]
No.
Rows CFM [L/s}
R-410a
Oz. [g] Net
Lbs. [kg]
Shipping
Lbs. [kg]
Height
“H”
(Inches)
Length
“L”
(Inches)
Wi th
“W”
(Inches)
ELECTRICAL PHYSICAL DIMENSIONAL DATA
(RLA) (LRA)
(-)ARL-024JEC 1-60-208/230 10.3/10.3 2 0.8 14/14 20/20 20/20 1 .8 [1.47] 1 228 [1078] 117 [3311] 190 [86.2] 200 [90.7] 23 44-3/8 31-1/2
(-)ARL-036JEC 1-60-208/230 16.7/16.7 82 1.0 22/22 30/30 3 /3 1 .8 [1.47] 1 3900 [1841] 1 7 [444 ] 236 [107] 246 [111.6] 33 44-3/8 31-1/2
(-)ARL-048JEC 1-60-208/230 21.2/21.2 96 1.0 28/28 3 /3 4 /4 1 .8 [1.47] 1 3900 [1841] 1 4 [43 4] 236 [107] 246 [111.6] 33 44-3/8 31-1/2
HS* 3 00 [16 2] 224 [62 0] 30 [138.4] 31 [142.8] 33 44-3/8 31-1/2
(-)ARL-060JEC 1-60-208/230 2 .6/2 .6 118 2.8 3 /3 4 /4 60/60 23.0 [2.14] 2 LS* 2800 [1322]
*HS = high speed
*LS = low speed
BOTTOM VIEW SHOWING DRAIN OPENINGS
(\\\\\ SHADED AREAS).
LINE VOLTAGE
ENTRY
111⁄32" [34 MM]
CONNECT THE LINE
VOLTAGE CONDUIT TO
THE BOTTOM OF THE
CONTROL BOX
LINE VOLTAGE
ENTRY
7⁄8" [22 MM]
2.3 DIMENSIONS
2.4 ELECTR CAL & PHYS CAL DATA
6

2.5 PROPER INSTALLATION
Proper sizing and installation of this equipment is critical to achieve optimal perfor-
mance. Use the information in this Installation Instruction Manual and reference the
applicable ngineering Specification Sheet when installing this product.
MPORTANT: This product has been designed and manufactured to meet N R-
GY STAR®criteria for energy efficiency when matched with appropriate coil compo-
nents. However, proper refrigerant charge and proper airflow are critical to achieve
rated capacity and efficiency. Installation of this product should follow the manufac-
turer’s refrigerant charging and airflow instructions. Failure to confirm proper
charge and airflow may reduce energy efficiency and shorten equipment life.
3.0 LOCATING UNIT
3.1 Corrosive Environment
The metal parts of this unit may be subject to rust or deterioration if exposed to a
corrosive environment. This oxidation could shorten the equipment’s useful life.
Corrosive elements include, but are not limited to, salt spray, fog or mist in seacoast
areas, sulphur or chlorine from lawn watering systems, and various chemical conta-
minants from industries such as paper mills and petroleum refineries.
If the unit is to be installed in an area where contaminants are likely to be a prob-
lem, special attention should be given to the equipment location and exposure.
• Avoid having lawn sprinkler heads spray directly on the unit cabinet.
• In coastal areas, locate the unit on the side of the building away from the water-
front.
• Shielding provided by a fence or shrubs may give some protection, but cannot
violate minimum airflow and service access clearances.
• levating the unit off its slab or base enough to allow air circulation will help
avoid holding water against the basepan.
Regular maintenance will reduce the build-up of contaminants and help to protect
the unit’s finish.
• Frequent washing of the cabinet, fan blade and coil with fresh water will remove
most of the salt or other contaminants that build up on the unit.
• Regular cleaning and waxing of the cabinet with a good automobile polish will
provide some protection.
• A good liquid cleaner may be used several times a year to remove matter that
will not wash off with water.
Several different types of protective coatings are offered in some areas. These
coatings may provide some benefit, but the effectiveness of such coating materials
cannot be verified by the equipment manufacturer.
3.2 CONDENSER LOCATION
Consult local and national building codes and ordinances for special installation
requirements. Following location information will provide longer life and simplified
servicing of the outdoor condenser.
NOTE: These units must be installed outdoors. No ductwork can be attached, or
other modifications made, to the discharge grille. Modifications will affect perfor-
mance or operation.
!WARNING
D SCONNECT ALL POWER TO UN T BEFORE START NG
MA NTENANCE. FA LURE TO DO SO CAN CAUSE ELECTR CAL SHOCK
RESULT NG N SEVERE PERSONAL NJURY OR DEATH.
7

3.3 Operational Issues
•MPORTANT: Locate the unit in a manner that will not prevent, impair or com-
promise the performance of other equipment horizontally installed in proximity
to the unit. Maintain all required minimum distances to gas and electric meters,
dryer vents, exhaust and inlet openings. In the absence of National Codes, or
manufacturers’ recommendations, local code recommendations and require-
ments will take precedence.
• Refrigerant piping and wiring should be properly sized and kept as short as
possible to avoid capacity losses and increased operating costs.
• Locate the unit where water run off will not create a problem with the equip-
ment. Position the unit away from the drip edge of the roof whenever possible.
Units are weatherized, but can be affected by the following:
o Water pouring into the unit from the junction of rooflines, without protective
guttering. Large volumes of water entering the heat pump while in operation
can impact fan blade or motor life, and coil damage may occur to a heat
pump if moisture cannot drain from the unit under freezing conditions.
o Freezing moisture, or sleeting conditions, can cause the cabinet to ice-over
prematurely and prevent heat pump operation, requiring backup heat, which
generally results in less economical operation.
• Closely follow clearance recommendations on Page 6.
o 24” to the service panel access
o 60” above heat pump fan discharge (unit top) to prevent recirculation
o 6” to heat pump coil grille air inlets
3.4 For Units With Space Limitations
FOR CONDENSERS WITH SPACE LIMITATIONS
In the event that a space limitation exists, we will permit the following clearances:
Single Unit Applications: Clearances below 6 inches will reduce unit capacity and
efficiency. Do not reduce the 60-inch discharge, or the 24-inch service clearances.
Multiple Unit Applications: When multiple condenser grille sides are aligned, a 6-
inch per unit clearance is recommended, for a total of 12” between two units. Two
combined clearances below 12 inches will reduce capacity and efficiency. Do not
reduce the 60-inch discharge, or 24-inch service, clearances.
3.5 Customer Satisfaction Issues
• The condensing unit should be located away from the living, sleeping and
recreational spaces of the owner and those spaces on adjoining property.
• To prevent noise transmission, the mounting pad for the outdoor unit should
not be connected to the structure, and should be located sufficient distance
above grade to prevent ground water from entering the unit.
3.6 Unit Mounting
If elevating the condensing unit, either on a flat roof or on a slab, observe the
following guidelines.
• The base pan provided elevates the heat pump 3/4” above the base pad.
• If elevating a unit on a flat roof, use 4” x 4” (or equivalent) stringers positioned
to distribute unit weight evenly and prevent noise and vibration (see Figure 2).
NOTE: Do not block drain openings shown in Figure 1.
3.7 Factory-Preferre Tie-Down Metho
INSTRUCTIONS
MPORTANT: These instructions are intended as a guide to securing equipment for
wind-load ratings of “120 MPH sustained wind load” and “3-second, 150 MPH gust.”
While this procedure is not mandatory, the Manufacturer does recommend that
equipment be properly secured in areas where high wind damage may occur.
ST P 1: Before installing, clear pad of any dirt or debris.
MPORTANT: The pad must be constructed of industry-approved materials,
and must be thick enough to accommodate the concrete fastener.
ST P 2: Center base pan on pad, ensuring it is level.
8

ST P 3: Using basepad as a guide, mark spots on concrete where 4 holes will be
drilled (see Figure 3).
ST P 4: Drill four pilot holes in pad, ensuring that the hole is at least 1/4” deeper
than the concrete screw being used.
ST P 5: Center basepan over pre-drilled holes and insert concrete screws.
ST P 6: Tighten concrete screws.
NOTE: Do not over-tighten the concrete screws. Doing so can weaken the
integrity of the concrete screw and cause it to break.
ST P 7: Finish unit assembly per unit’s installation instructions.
4.0 REFRIGERANT CONNECTIONS
All units are factory charged with Refrigerant 410A. All models are supplied with
service valves. Keep tube ends sealed until connection is to be made to prevent
system contamination.
4.1 Tools Require For Installing & Servicing R-410A Mo els
Manifold Sets:
-Up to 800 PS G High side
-Up to 250 PS G Low Side
-550 PS G Low Side Retard
Manifold Hoses:
-Service Pressure Rating of 800 PS G
Recovery Cylinders:
-400 PS G Pressure Rating
-Dept. of Transportation 4BA400 or BW400
9
!
CAUTION
R-410A systems operate at higher pressures than R-22 systems. Do not use
R-22 service equipment or components on R-410A equipment.
F GURE 2
RECOMMENDED ELEVATED NSTALLAT ON

4.2 Specifications of R-410A:
Application: R-410A is not a drop-in replacement for R-22; equipment designs
must accommodate its higher pressures. It cannot be retrofitted into R-22 heat
pumps.
Physical Properties: R-410A has an atmospheric boiling point of -62.9°F and its
saturation pressure at 77°F is 224.5 psig.
Composition: R-410A is an azeotropic mixture of 50% by weight difluoromethane
(HFC-32) and 50% by weight pentafluoroethane (HFC-125).
Pressure: The pressure of R-410A is approximately 60% (1.6 times) greater
than R-22. Recovery and recycle equipment, pumps, hoses and the like need to
have design pressure ratings appropriate for R-410A. Manifo d sets need to range
up to 800 psig high-side and 250 psig ow-side with a 550 psig ow-side retard.
Hoses need to have a service pressure rating of 800 psig. Recovery cy inders need
to have a 400 psig service pressure rating. DOT 4BA400 or DOT BW400.
Combustibility: At pressures above 1 atmosphere, mixture of R-410A and air can
become combustible. R-410A and air should never be mixed in tanks or supply
lines, or be allowed to accumulate in storage tanks. Leak checking should
never be done with a mixture of R-410A and air. Leak checking can be per-
formed safely with nitrogen or a mixture of R-410A and nitrogen.
4.3 Quick Reference Gui e For R-410A
• R-410A refrigerant operates at approximately 60% higher pressure (1.6 times)
than R-22. nsure that servicing equipment is designed to operate with R-410A.
• R-410A refrigerant cylinders are pink in color.
• R-410A, as with other HFC’s is only compatible with PO oils.
10
F GURE 3
SCREW LOCAT ONS
TABLE 2
D MENS ONS
MODEL NUMBER LWAB CD
(-)ARL-024/036/048/060 41.5 29.813 15 38 3.5 26.5

• Vacuum pumps will not remove moisture from oil.
• R-410A systems are to be charged with liquid refrigerants. Prior to March 1999,
R-410A refrigerant cylinders had a dip tube. These cylinders should be kept
upright for equipment charging. Post March 1999 cylinders do not have a dip
tube and should be inverted to ensure liquid charging of the equipment.
• Do not install a suction line filter drier in the liquid line.
• A liquid line filter drier is standard on every unit. Only manufacturer approved liq-
uid line filter driers can be used. These are Sporlan (CW083S) and Alco
(80K083S) driers. These filter driers are rated for minimum working pressure of
600 psig.
• Desiccant (drying agent) must be compatible for PO oils and R-410A.
5.0 REPLACEMENT UNITS
To prevent failure of a new condensing unit, the existing evaporator tubing system
must be correctly sized and cleaned or replaced. Care must be exercised that the
expansion device is not plugged. For new and replacement units, a liquid line filter
drier should be installed and refrigerant tubing should be properly sized. Test the oil
for acid. If positive, a suction line filter drier is mandatory.
MPORTANT: WH N R PLACING AN R-22 UNIT WITH AN R-410A UNIT,
ITH R R PLAC TH LIN S T OR NSUR THAT TH XISTING LIN S T
IS THOROUGHLY CL AN D OF ANY OLD OIL OR D BRIS.
6.0 INDOOR COIL
REFER TO NDOOR CO L MANUFACTURER’S NSTALLAT ON NSTRUC-
T ONS.
MPORTANT: The manufacturer is not responsible for the performance and opera-
tion of a mismatched system, or for a match listed with another manufacturer’s coil.
NOTE: All (-)ARL units must be installed with a TXV Evaporator.
The thermostatic expansion valve is specifically designed to operate with R-410A.
DO NOT use an R-22 TXV or evaporator. The existing evaporator must be
replaced with the factory specified TXV evaporator specifically designed for
R-410A.
6.1 Location
Do not install the indoor coil in the return duct system of a gas or oil furnace.
Provide a service inlet to the coil for inspection and cleaning. Keep the coil pitched
toward the drain connection.
7.0 INTERCONNECTING TUBING
7.1 Vapor an Liqui Lines
Keep all lines sealed until connection is made.
Make connections at the indoor coil first.
11
!CAUTION
Only use evaporators approved for use on R-410A systems. Use of existing R-22
evaporators can introduce mineral oil to the R-410A refrigerant forming two differ-
ent liquids and decreasing oil return to the compressor. This can result in com-
pressor failure.
!CAUTION
When coil is installed over a finished ceiling and/or living area, it is
recommended that a secondary sheet metal condensate pan be
constructed and installed under entire unit. Failure to do so can result
in property damage.

12
Refer to Line Size Information in Tables 3, 4 and 5 for correct size and multipliers to
be used to determine capacity for various vapor line diameters and lengths of run.
The losses due to the lines being exposed to outdoor conditions are not included.
The factory refrigeration charge in the outdoor unit is sufficient for 15 feet of inter-
connecting lines. The factory refrigeration charge in the outdoor unit is sufficient for
the unit and 15 feet of standard size interconnecting liquid and vapor lines. For dif-
ferent lengths, adjust the charge as indicated below.
1/4” ± .3 oz. per foot
5/16” ± .4 oz. per foot
3/8” ± .6 oz. per foot
1/2” ± 1.2 oz. per foot
7.2 Maximum Length of Lines
The maximum length of interconnecting line is 150 feet. Always use the shortest
length possible with a minimum number of bends. Additional compressor oil is not
required for any length up to 150 feet.
NOTE: xcessively long refrigerant lines cause loss of equipment capacity.
7.3 Out oor Unit Installe Above or Below In oor Coil
Use the following guidelines when installing the unit:
1. xpansion Valve Coil:
a. The vertical separation cannot exceed the value in Tables 4 and 5.
b. No changes are required for expansion valve coils.
2. It is recommended to use the smallest liquid line size permitted to minimize the
system charge.
3. Tables 4 and 5 may be used for sizing horizontal runs.
TABLE 3
VAPOR L NE CAPAC TY MULT PL ER
024
(-)ARL
Unit Vapor Line
Connection Size
(inches .D.) [mm]
Vapor Line Run
Feet [m]
3/4” [19.05] .D.
Sweat
7/8” [22.23] .D.
Sweat
7/8” [22.23] .D.
Sweat
7/8” [22.23] .D.
Sweat
5/8” [15.88]
Optional
5/8” [15.88]
Optional
5/8” [15.88]
Optional
3/4” [19.05]
Optional
25‘ [7.62]
50’ [15.24]
75’ [22.86]
100’ [30.48]
125’ [38.10]
150’ [45.72]
Opt.
Std.
Opt.
Opt.
Std.
Opt.
Opt.
Std.
Opt.
Opt.
Std.
Opt.
Opt.
Std.
Opt.
Opt.
Std.
Opt.
3/4” [19.05]
Standard
3/4” [19.05]
Standard
3/4” [19.05]
Standard
7/8” [22.23]
Standard
——
7/8” [22.23]
Optional —
1.00 0.98 0.98 0.99
1.00 1.00 1.00 1.00
N/A N/A 1.02 N/A
0.99 0.96 0.96 0.97
1.00 0.99 0.99 0.99
N/A N/A 1.00 N/A
0.98 0.96 0.94 0.96
0.99 0.98 0.98 0.99
N/A N/A 1.00 N/A
0.97 0.94 0.92 0.95
N/A N/A 0.98 0.98
N/A N/A N/A N/A
0.97 0.93 0.90 0.94
N/A N/A 0.97 0.97
N/A N/A N/A N/A
0.96 0.92 0.88 0.93
N/A N/A 0.96 0.97
N/A N/A N/A N/A
036 048 060
Vapor Line Diameter (inches O.D.) [mm]
NOT S:
1. Do NOT exceed the limits in the liquid and suction line sizing charts.
2. Do NOT use 7/8 OD suction lines in 2 or 3-ton applications.
3. Do NOT use 1-1/8 OD suction line in ANY application.
4. 2 and 3-ton line sets over 75 feet MUST use the optional suction line.

13
7.4 Tubing Installation
Observe the following when installing correctly sized type “L” refrigerant tubing
between the condensing unit and evaporator coil:
• If a portion of the liquid line passes through a hot area where liquid refrigerant
can be heated to form vapor, insulating the liquid line is required.
• Use clean, dehydrated, sealed refrigeration grade tubing.
• Always keep tubing sealed until tubing is in place and connections are to be
made.
• Blow out the liquid and vapor lines with dry nitrogen before connecting to the
outdoor unit and indoor coil. Any debris in the line set will end up plugging the
expansion device.
• As an added precaution, a high quality filter drier is standard on R-410A units.
• Do not allow the vapor line and liquid line to be in contact with each other. This
causes an undesirable heat transfer resulting in capacity loss and increased
power consumption. The vapor line must be insulated.
LQU D L NE S ZE - OUTDOOR UN T ABOVE NDOOR CO L
R-410A
System
Capacity
Model
Line Size
Connection
Size (Inch
I.D.) [mm]
Line Size
(Inch O.D.)
[mm]
Minimum Vertical Separation - Feet [m]
1/4” [6.35] 0 1 [0.31] 24 [7.32] 50 [15.24] 76 [23.17] 102 [31.09]
-024 3/8” [9.53] 5/16” [7.93]* 000000
3/8” [9.52] 000000
5/16” [7.93] 0005 [1.52] 13 [3.96] 20 [6.10]
-036 3/8” [9.53] 3/8” [9.52]* 000000
1/2” [12.70] 000000
5/16” [7.93] 0007 [2.13] 28 [8.53] 50 [15.24]
-048 3/8” [9.53] 3/8” [9.52]* 000000
1/2” [12.70] 000000
3/8” [9.52]* 00 0000
-060 3/8” [9.53] 1/2” [12.70] 000000
25 [7.62] 50 [15.24] 75 [22.86] 100 [30.48] 125 [38.1] 150 [45.72]
Liquid Line Size
Outdoor Unit Above Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total Equivalent Length - Feet [m]
L QU D L NE S ZE - OUTDOOR UN T BELOW NDOOR CO L
R-410A
System
Capacity
Model
Line Size
Connection
Size (Inch
I.D.) [mm]
Line Size
(Inch O.D.)
[mm]
Maximum Vertical Separation - Feet [m]
1/4” [6.35] 13 [3.96] N/A N/A N/A N/A N/A
-024 3/8” [9.53] 5/16” [7.93]* 25 [7.62] 21 [6.40] 17 [5.18] 13 [3.96] 9 [2.74] N/A
3/8” [9.52] 25 [8.23] 26 [7.93] 25 [7.62] 23 [7.01] 22 [6.71] 20 [6.10]
5/16” [7.93] 15 [4.57] N/A N/A N/A N/A N/A
-036 3/8” [9.53] 3/8” [9.52]* 19 [5.79] 17 [5.18] 15 [4.57] 12 [3.66] 10 [3.05] N/A
1/2” [12.70] 21 [6.40] 21 [6.40] 20 [6.10] 20 [6.10] 19 [5.79] 19 [5.79]
5/16” [7.93] 25 [9.14] 17 [5.18] N/A N/A N/A N/A
-048 3/8” [9.53] 3/8” [9.52]* 25 [11.89] 34 [10.36] 30 [9.14] 25 [7.62] 21 [6.40] 17 [5.18]
1/2” [12.70] 25 [12.80] 41 [12.50] 41 [12.50] 40 [12.19] 39 [11.89] 38 [11.58]
3/8” [9.52]* 25 [17.98] 49 [14.94] 40 [12.19] 30 [9.14] 20 [6.10] 10 [3.05]
-060 3/8” [9.53] 1/2” [12.70] 25 [19.51] 50 [18.90] 61 [18.59] 60 [18.29] 59 [17.98] 57 [17.37]
25 [7.62] 50 [15.24] 75 [22.86] 100 [30.48] 125 [38.1] 150 [45.72]
Liquid Line Size
Outdoor Unit Below Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total Equivalent Length - Feet [m]
TABLE 4
(-)ARL L QU D L NE S Z NG
NOTES: N/A = Application Not Recommended
*Standard Line Size
NOTES: N/A = Application Not Recommended
*Standard Line Size

14
TABLE 5
(-)ARL SUCT ON L NE S Z NG
SUCT ON L NE S ZE - OUTDOOR UN T ABOVE NDOOR CO L
R-410A
System
Capacity
Model
Line Size
Connection
Size (Inch
I.D.) [mm]
Line Size
(Inch O.D.)
[mm]
Outdoor Unit ABOVE Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total Equivalent Length - Feet [m]
5/8” [15.88] Same as Liquid Line Size Table
-024 3/4” [19.05] 3/4” [19.05]* N/A
7/8” [22.23] N/A
5/8” [15.88] Same as Liquid Line Size Table
-036 3/4” [19.05] 3/4” [19.05]* N/A
7/8” [22.23] N/A
5/8” [15.88] Same as Liquid Line Size Table
-048 7/8” [22.22] 3/4” [19.05] Same as Liquid Line Size Table
7/8” [22.23]* Same as Liquid Line Size Table
3/4” [19.05] Same as Liquid Line Size Table
-060 7/8” [22.22] 7/8” [22.23]* Same as Liquid Line Size Table
1-1/8” [28.58] N/A
25 [7.62] 50 [15.24] 75 [22.86] 100 [30.48] 125 [38.1] 150 [45.72]
Suction Line Size
SUCT ON L NE S ZE - OUTDOOR UN T BELOW NDOOR CO L
R-410A
System
Capacity
Model
Line Size
Connection
Size
(Inch I.D.)
[mm]
Line Size
(Inch O.D.)
[mm]
Outdoor Unit BELOW Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total Equivalent Length - Feet [m]
5/8” [15.88] Same as Liquid Line Size Table
-024 3/4” [19.05] 3/4” [19.05]* Same as Liquid Line Size Table N/A
7/8” [22.23] N/A
5/8” [15.88] Same as Liquid Line Size Table
-036 3/4” [19.05] 3/4” [19.05]* Same as Liquid Line Size Table
7/8” [22.23] N/A
5/8” [15.88] Same as Liquid Line Size Table
-048 7/8” [22.22] 3/4” [19.05] Same as Liquid Line Size Table
7/8” [22.23]* Same as Liquid Line Size Table
3/4” [19.05] Same as Liquid Line Size Table
-060 7/8” [22.22] 7/8” [22.23]* Same as Liquid Line Size Table
1-1/8” [28.58] N/A
25 [7.62] 50 [15.24] 75 [22.86] 100 [30.48] 125 [38.1] 150 [45.72]
Suction Line Size
• If tubing has been cut, make sure ends are deburred while holding in a position
to prevent chips from falling into tubing. Burrs such as those caused by tubing
cutters can affect performance dramatically, particularly on small liquid line
sizes.
• For best operation, keep tubing run as short as possible with a minimum num-
ber of elbows or bends.
• Locations where the tubing will be exposed to mechanical damage should be
avoided. If it is necessary to use such locations, the copper tubing should be
housed to prevent damage.
• If tubing is to be run underground, it must be run in a sealed watertight chase.
• Use care in routing tubing and do not kink or twist. Use a good tubing bender
on the vapor line to prevent kinking.
• Route the tubing using temporary hangers, then straighten the tubing and
install permanent hangers. Line must be adequately supported.
NOTES: Using suction line larger than shown in chart will result in poor oil return.
N/A = Application Not Recommended
*Standard Line Size
NOTES: Using suction line larger than shown in chart will result in poor oil return.
N/A = Application Not Recommended
*Standard Line Size

15
• The vapor line must be insulated to prevent dripping (sweating) and prevent
performance losses. Armaflex and Rubatex are satisfactory insulations for this
purpose. Use 1/2” minimum insulation thickness, additional insulation may be
required for long runs.
• Check Table 3 for the correct vapor line size. Check Table 4 for the correct liq-
uid line size.
7.5 Tubing Connections
Indoor coils have only a holding charge of dry nitrogen. Keep all tube ends sealed
until connections are to be made.
• Use type “L” copper refrigeration tubing. Braze the connections with the follow-
ing alloys:
–copper to copper - 5%
– Silver alloy (no flux)
– copper to steel or brass - 35%
– silver alloy (with flux)
• Be certain both refrigerant shutoff valves at the outdoor unit are closed.
• Clean the inside of the fittings and outside of the tubing with steel wool or sand
cloth before soldering. Always keep chips, steel wool, dirt, etc., out of the inside
when cleaning.
• Assemble tubing part way into fitting. Apply flux all around the outside of the
tubing and push tubing into stop. This procedure will keep the flux from getting
inside the system.
• Remove the cap and schrader core from service port to protect seals from heat
damage.
• Use an appropriate heatsink material around the copper stub and the service
valves before applying heat.
•MPORTANT: Do not braze any fitting with the T V sensing bulb attached.
• Braze the tubing between the outdoor unit and indoor coil. Flow dry nitrogen
into a service port and through the tubing while brazing.
• After brazing – use an appropriate heatsink material to cool the joint and
remove any flux residue.
• The service valves are not backseating valves. To open the valves, remove the
valve cap with an adjustable wrench. Insert a 3/16” or 5/16” hex wrench into the
stem. Back out counterclockwise.
• Replace the valve cap finger tight then tighten an additional 1/2 hex flat for a
metal-to-metal seal.
7.6 Leak Testing
• Pressurize line set and coil through service fittings with dry nitrogen to 150
PSIG maximum. Leak test all joints using liquid detergent. If a leak is found,
recover pressure and repair.
8.0 COMPRESSOR CRANKCASE HEAT (CCH)
CCH is standard on these models due to refrigerant migration during the off cycle
that can result in a noisy start up.
Crankcase Heater Operation:
Supplemental Crankcase heat is required to prevent refrigerant migration in sys-
tems with relatively high system refrigerant charges.
The crankcase heater control is integrated into the Comfort Contro 2and is
designed for maximum energy savings.
Summary of operation:
• The crankcase heater is off whenever the compressor is running.
!WARNING
DO NOT USE OXYGEN TO PURGE L NES OR PRESSUR ZE SYSTEM FOR
LEAK TEST. OXYGEN REACTS V OLENTLY W TH O L, WH CH CAN
CAUSE AN EXPLOS ON RESULT NG N SEVERE PERSONAL NJURY OR
DEATH.

• Once the compressor turns off, the crankcase heater control (CCH) begins the
two-hour timer countdown.
• If the compressor stays off for two hours, the CCH turns on the crankcase heater.
All heaters are located on the lower half of the compressor shell. Its purpose is to
drive refrigerant from the compressor shell during long off cycles, thus preventing
damage to the compressor during start-up.
At initial start-up or after extended shutdown periods, make sure the heater is ener-
gized for at least 12 hours before the compressor is started. (Disconnect switch on
and wall thermostat off.)
9.0 HARD START COMPONENTS
Factory-installed start components are standard on all models.
10.0 HIGH AND LOW PRESSURE CONTROLS
10.0 (HPC AND LPC)
These controls keep the compressor from operating in pressure ranges which can
cause damage to the compressor. Both controls are in the low voltage control cir-
cuit.
High pressure control (HPC) is an automatic-reset which opens near 610 PSIG and
closes near 420 PSIG.
The low pressure control (LPC) is an automatic-reset which opens near 15 PSIG
and closes near 40 PSIG.
NOTE: HPC and LPC are monitored by the Comfort Contro 2. See Section 12.0.
10.1 Evacuation Proce ure
vacuation is the most important part of the entire service procedure. The life and
efficiency of the equipment is dependent upon the thoroughness exercised by the
serviceman when evacuating air and moisture from the system.
Air in the system causes high condensing temperatures and pressure, resulting in
increased power input and non-verifiable performance.
Moisture chemically reacts with the refrigerant and oil to form corrosive hydrofluoric
and hydrochloric acids. These attack motor windings and parts, causing breakdown.
After the system has been leak checked and proven sealed, connect the vacuum
pump and evacuate system to 500 microns. The vacuum pump must be connected
to both the high and low sides of the system through adequate connections. Use
the largest size connections available since restrictive service connections may lead
to false readings because of pressure drop through the fittings.
MPORTANT: Compressors (especially scroll type) should never be used to evacu-
ate the air conditioning system because internal electrical arcing may result in a
damaged or failed compressor.
With thermostat in the “Off” position, turn the power on to the furnace and the heat
pump. Start the heat pump and the furnace with the thermostat. Make sure the
blower is operating.
16
!CAUTION
THE COMPRESSOR HAS AN NTERNAL OVERLOAD PROTECTOR. UNDER
SOME COND T ONS, T CAN TAKE UP TO 2 HOURS FOR TH S OVERLOAD
TO RESET. MAKE SURE OVERLOAD HAS HAD T ME TO RESET BEFORE
CONDEMN NG THE COMPRESSOR.

11.0 CONDENSING UNITS EQUIPPED WITH THE
11.0 COMFORT CONTROL2SYSTEM™
Comfort Contro 2is the next generation of the Integrated Compressor Control (ICC)
and is an integral part of the Comfort Contro 2System™ with the following features:
11.1 Control Description (see Figure 4)
Dual 7-Segment LED
• Displays status and diagnostic codes (See Status and Diagnostic Description)
• Displays diagnostic/fault recall (See Test Mode/Fault Recall)
Re LED (Y1)
• Y1 red L D (solid on) indicates Y1 call from thermostat is present
Line Voltage Connector
• Line voltage is connected to control board at lug terminals L1 & L2
• Maximum wire size accepted is 6 AWG copper wire
• # 4 – 6 AWG 45 in/lbs
# 8 AWG 40 in/lbs
# 10 – 14 AWG 35 in/lbs
(Check wire terminations annually)
Compressor Control (K2)
• Sealed single pole compressor relay switch with optical feedback feature (arc
detection)
!CAUTION
UN T MAY START SUDDENLY AND W THOUT WARN NG
Solid red light indicates a thermostat call for unit operation is present at
the CC control. CC control will attempt to start unit after short cycle timer
expires or when in Active Protection mode will attempt to restart unit prior
to Lockout mode.
COMFORT CONTROL2SYSTEM™ CONTROL WIRING
F GURE 4
COMFORT CONTROL2BOARD
COMPRESSOR
WIRING
CONNECTOR
O.D. FAN (OFM) RELAY
COMPRESSOR
CONTROL (K2)
ICC (INT GRAT D
COMPR SSOR CONTROL) TEST BUTTON 7-SEGMENT LED
AMBIENT DEFROST
CONTROL
DEFROST SENSOR
SW2 BUTTON
RED LED (Y1)
LOW VOLT FUSE
THERMOSTAT
CONNECTION (E2)
LOW PRESSURE CONTROL INPUT
HIGH PRESSURE CONTROL INPUT
{
MEMORY CARD
LINE VOLTAGE
CONNECTION
17

Thermostat Connector (E2)
•R– 24VAC from the indoor unit 24VAC transformer (40 VA minimum)
•C– 24VAC Common from the indoor unit 24VAC transformer
• 1-Data: System Communications Line 1
• 2-Data: System Communications Line 2
Low Volt Fuse
• If required replace with 3 A automotive ATC style blade fuse
Low Pressure Control (LPC Input)
• Low-pressure control is factory installed
• Low pressure control is an automatic resetting device
High Pressure Control (HPC Input)
• High-pressure control is factory installed
• High pressure control is an automatic resetting device
Ambient Temperature Sensor (inclu e with all applications)
• Included with all applications
TEST an SW2 Buttons
• T ST and SW2 buttons used to enter Test and Fault Recall Mode
Memory Car
• The memory card stores all unit information.
• The unit information is called shared data.
• The shared data is all the information needed for proper unit operation.
11.2 Comfort Control2System™ Control Wiring
The Comfort Contro 2System™ consists of:
• Serial communicating heat pump or condensing unit equipped with the Comfort
Contro 2System™
• Air handler or furnace equipped with the Comfort Contro 2System™
•Comfort Contro 2thermostat
MPORTANT: If the installed system does not meet these requirements, the system
must be wired using traditional control wiring, reference Section 11.7 Conventional
24VAC Thermostat Control Wiring.
The Comfort Contro 2System™ requires four (4) control wires for unit operation:
R – 24VAC
C – 24VAC common
1 – Data wire 1
2 – Data wire 2
Note: Comfort Contro 2System™ requires 18 AWG thermostat wire.
Note: Term dip switches should be in “ON” position.
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 hole in the base
panel, up to and attached to the pigtails from the bottom of the control box. Conduit
can be run to the base panel if desired by removing the insulated bushing.
The Comfort Contro 2air handler or Comfort Contro 2furnace transformer is
equipped with a 24 volt, 50 VA transformer for proper system operation. See the
wiring diagram in Figure 5 for reference. Use Table 5 to size the 24-volt control
wiring.
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
thermostat 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.
11.3 Comfort Control2System™ ICC Control Operation
nstallation Verification
• 24V AC power on R&C must be present at the ICC for it to operate
18
COMFORT CONTROL2SYSTEM™ CONTROL WIRING

• Line voltage must be present at the ICC for the compressor and the outdoor fan
to operate
• The ICC displays a “0” for standby mode. Standby mode indicates line voltage
and 24VAC are present at the ICC and there is not a command for unit operation
from the Comfort Contro 2thermostat.
Zero (0) displayed
The unit is in standby
Command for Compressor Operation (Y1 LED)
• If a command for compressor operation is received by the ICC (first stage/second
stage cooling or first stage/second stage heating), the red Y1 L D will illuminate.
• The ICC has an on/off fan delay of one (1) second for each stage of heating or
cooling.
• The ICC ignores the low pressure control for the first 90 seconds of compressor
operation.
• The dual 7-segment L D displays five (5) operational status codes.
1) First Stage Cooling Operation – When the ICC receives a command for first
stage cooling operation, a lower case “c” is displayed on the dual 7-segment L Ds.
Lower case “c” indicates first stage cooling operation
2) Second Stage Cooling Operation – When the ICC receives a command for
second stage cooling operation, an upper case “C” is displayed on the dual 7-
segment L Ds.
Upper case “C” indicates second stage cooling operation
3-minute Anti-short Cycle Timer
• The ICC has a built in 3-minute time delay between compressor operations to
protect the compressor against short cycling. The dual 7-segment L Ds will flash
“c” or “C” while the short cycle timer is active and a command for unit operation is
received.
19
F GURE 5
TYP CAL 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

Flashing lower case c
A command for first stage cooling has been received
Flashing upper case C
A command for second stage cooling has been received
• The 3-minute time delay can be bypassed when a command for compressor
operation is present by pressing the T ST button for 1 second and releasing.
The compressor will begin operation and the dual 7-segment will stop flashing.
30 Second Minimum Run Timer
• The ICC has a built in 30 second minimum unit run time. If a command for com-
pressor operation is received by the ICC and the command is removed, the com-
pressor will continue to operate for 30 seconds. The dual 7-segment L Ds will
flash “c” or “C” while the minimum run timer is active.
1 Second Compressor/Fan Delay
• The ICC starts/stops the outdoor fan one (1) second after the start/stop of the
compressor upon a command for compressor operation to minimize current
inrush and/or voltage drop.
11.4 Active Compressor Protection Mo e
• The ICC actively protects the compressor from harmful operation during a fault
condition.
• When the ICC detects a condition that could damage the compressor, the ICC will
enter active protection mode and lockout compressor operation
• The condition causing active protection must be resolved then the ICC can be
reset to restart the system.
• There are five (5) active protection modes:
1) Low Pressure Control Lockout
• The ICC will display a flashing “L” followed by a flashing 21 when a low pressure
control lockout occurs.
• The ICC addresses low pressure control faults differently depending on the mode
of unit operation (cooling or heating mode).
Active Protection – Code L21 – Open low pressure control
Cooling Mode
• If the LPC opens three (3) times during the same command for cooling operation,
the ICC will lockout the compressor to keep it from continuing to operate and flash
a L” on the dual 7-segment L Ds followed by a “21”.
MPORTANT: This mode of active protection must be manually reset.
2) High Pressure Control Lockout
• If the HPC opens three (3) times during the same command for unit operation, the
ICC will lockout the compressor to keep it from continuing to operate and flash a
L” on the dual 7-segment L Ds followed by a “29”.
COMFORT CONTROL2SYSTEM™ CONTROL WIRING
20