W5AM Evaporator A-Coil Refrigerant Leaks

Product Information

Specifications

• Product Name: EAM5X, W5AM Evaporator A-Coil, Cased,
  Multipoise

• Refrigerant: R-454B

• Compatibility: Only for use with R-454B refrigerant and outdoor
  condensers certified for R-454B

• Safety Features: Internal sensor for refrigerant leak
  detection, external control board

Product Usage Instructions

Safety Considerations

Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Use quenching cloths for brazing
operations. Have a fire extinguisher available. Read the entire
instruction manual before starting the installation.

Furnace/Coil Matching

Ensure the coil is matched to heating equipment meeting CSA/ANSI
Z21.47 or cooling equipment meeting UL 60335-2-40 standards. Refer
to the furnace/blower installation instructions for additional
considerations when installing coils with composite drain pans.

Partial Unit Requirements

These evaporator coils are PARTIAL UNIT HEAT PUMP OR AIR
CONDITIONER and must only be connected to units complying with
UL/CSA 60335-2-40 Standard.

Electrical Shock Hazard

Always turn off the main power to the system before installing,
modifying, or servicing. Lock out and tag switches with warning
labels.

Explosion Hazard

Avoid using air or gases containing oxygen for leak testing or
operating refrigerant compressors to prevent potential
explosions.

Cut Hazard

Handle sheet metal parts with care as they may have sharp edges
or burrs. Wear appropriate protective clothing and gloves when
handling parts.

Unit or Property Damage Hazard

Avoid direct contact of aluminum tubes with dissimilar metals to
prevent galvanic corrosion and premature failure.

FAQ

Q: Can this product be used with any type of refrigerant?

A: No, this product is designed for use with R-454B refrigerant
only.

Q: What safety precautions should I take during

installation?

A: Follow all safety codes, wear safety gear, turn off the main
power, and adhere to the warnings in the manual.

Q: How do I ensure proper matching of the coil with the heating

or cooling equipment?

A: Refer to the furnace/blower installation instructions and
ensure compatibility with CSA/ANSI Z21.47 or UL 60335-2-40
standards.

EAM5X, W5AM: Installation Instructions

EAM5X, W5AM
Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant

Installation Instructions

IMPORTANT: This unit is to be used with R-454B refrigerant only. This system includes an internal sensor to detect any refrigerant leaks with an external control board that must be connected to a furnace. This is only compatible with outdoor condensers that are R-454B certified.

NOTE: Read the entire instruction manual before starting the installation.
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inspect Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Select Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation of Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Table 1 ­ Coil Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Upflow Coil Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Downflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Horizontal Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Refrigerant Line Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Leak Dissipation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 24V Control System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2 ­ Dissipation System Wiring Label . . . . . . . . . . . . . . . . . 8 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3 ­ Communication Plug Designations . . . . . . . . . . . . . . . . 9 Leak Dissipation System Installation. . . . . . . . . . . . . . . . . . . . . . . 9 Table 4 ­ Dissipation Board Test Button Functions . . . . . . . . . . . 9 Table 5 ­ Required Operational Checks to Ensure Proper Dissipation System Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 6 ­ Required Minimum Dissipation Mode Airflows, based on Total System Refrigerant Charge Quantity. . . . . . . . . . 10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Sequence of Events — Dissipation Mode . . . . . . . . . . . . . . . . . . 10 Flash Codes / Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 7 ­ Flash Code Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Unit Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause death, personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing and work gloves. Use quenching cloths for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and the current editions of the National Electrical Codes (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical Code CSA C22.1.

Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
! WARNING
PROPERTY DAMAGE HAZARD — FURNACE/COIL MATCHING Failure to follow this warning could result in property damage, personal injury, or death. This coil must be matched to heating equipment that meets all CSA/ANSI Z21.47 or cooling equipment that meets UL 60335-2-40. Refer to the furnace/blower installation instructions for any potential considerations when installing coils with composite drain pans.
! CAUTION
PARTIAL UNIT REQUIREMENTS Failure to follow this warning could result in equipment damage. This family of evaporator coils are PARTIAL UNIT HEAT PUMP OR AIR CONDITIONER, complying with PARTIAL UNIT requirements of UL/CSA 60335-2-40 Standard, and must only be connected to other units that have been confirmed as complying to corresponding PARTIAL UNIT requirements of this UL/CSA 60335-2-40 Standard.
! WARNING
PERSONAL INJURY / PROPERTY DAMAGE HAZARD Failure to follow this warning could result in property damage, personal injury, or death. For continued performance, reliability, and safety, the only approved accessories and replacement parts are those specified by the equipment manufacturer. The use of non-manufacturer approved parts and accessories could invalidate the equipment limited warranty and result in fire risk, equipment malfunction, and failure. Please review manufacturer’s instructions and replacement part catalogs available from your equipment supplier.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 1

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions

! WARNING
ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Before installing, modifying or servicing system, always turn off main power to system. There may be more than one disconnect switch. Lock out and tag switch with a suitable warning label.
! CAUTION
HOT TUBE WARNING Failure to follow this caution could result in personal injury and/or property damage. Refrigerant lines can reach or exceed 130 °F (54 °C). Avoid contact with the vapor header or vapor line, especially in Heating Mode. Do not service A2L refrigerant furnace coils while these components are hot to avoid risk of ignition source.
! WARNING
PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury. This coil contains Nitrogen precharge of 7 ­ 10 PSIG. Release this pressure through the center of the rubber plugs before removing plugs.
! WARNING
EXPLOSION HAZARD Failure to follow this warning could result in death, serious personal injury, and/or property damage. Never use air or gases containing oxygen for leak testing or operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can cause an explosion.
! CAUTION
CUT HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts.
! CAUTION
UNIT OR PROPERTY DAMAGE HAZARD Failure to follow this caution may result in property damage. Make sure that Aluminum tubes do not come in direct contact or allow for condensate run off with a dissimilar metal. Dissimilar metals can cause galvanic corrosion and possible premature failure.

! WARNING
PROPERTY OR PERSONAL INJURY HAZARD Risk of fire. Flammable refrigerant used. To be repaired only by trained service personnel. Do not puncture refrigerant tubing. Auxiliary devices which may be ignition sources shall not be installed in the ductwork, other than auxiliary devices listed for use with the specific appliance. See instructions. Dispose of refrigerant properly in accordance with federal or local regulations.

INTRODUCTION
Use this instruction manual to install EAM5X or W5AM indoor coil on multipoise furnaces. The coil is enclosed in a casing.
Inspect Equipment
Inspect equipment for damage prior to installation. File claim with shipping company if shipment is damaged or incomplete. Locate the rating plate attached to the coil assembly. Check the rating plate model number and the AHRI Directory to ensure outdoor and indoor units are properly matched and meet job specifications.
Select Installation
See Table 1 for dimensions. Note instructions for placement of the coil casing on the furnace.

INSTALLATION OF COIL
NOTE: Consult the furnace installation instructions for any special requirements when installing the coil to the furnace.
Table 1 ­ Coil Information

Model Number
EAM5X19M17 EAM5X24M14 / W5AM24M14 EAM5X24M17 / W5AM24M17 EAM5X25M17 / W5AM25M17 EAM5X30M14 / W5AM30M14 EAM5X30M17 / W5AM30M17 EAM5X36M17 / W5AM36M17
EAM5X36M21 EAM5X37M17 / W5AM37M17
EAM5X37M21 EAM5X42M21 / W5AM42M21
EAM5X42M24 EAM5X43M21 / W5AM43M21 EAM5X48M21 / W5AM48M21
EAM5X48M24 EAM5X60M24 / W5AM60M24 EAM5X61M21 / W5AM61M21 EAM5X61M24 / W5AM61M24

Size (Ton)

Flush Fit to Furnace Width (in.)

Stub Out Tube Size, in.
Liquid Suction

1-1/2 17-1/2

3/8

5/8

2

14-3/16 3/8

5/8

2

17-1/2

3/8

5/8

2

17-1/2

3/8

5/8

2-1/2 14-3/16

3/8

3/4

2-1/2 17-1/2

3/8

3/4

3

17-1/2

3/8

3/4

3

21

3/8

3/4

3

17-1/2

3/8

3/4

3

21

3/8

3/4

3.5

21

3/8

7/8

3.5

24-1/2

3/8

7/8

3.5

21

3/8

7/8

4

21

3/8

7/8

4

24-1/2

3/8

7/8

5

24-1/2

3/8

7/8

5

21

3/8

7/8

5

24-1/2

3/8

7/8

Upflow Coil Installation
The cased coil is designed to fit furnaces of the same width.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 2

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions
1. Set coil in place on upflow furnace discharge air opening. See Fig. 1 and Fig. 2.
2. Ensure coil is level for proper condensate drainage. Do not tip coil toward condensate drain. Coil casing need not be fastened or screwed to furnace.
3. When installing wider coil on narrow furnace, create field fabricated adapter.
NOTE: On upflow installations where the indoor coil is placed in an unconditioned space, a 6-in wide piece of insulation should be applied and wrapped around the outside of coil casing and supply duct contact point.
NOTE: Consult the furnace installation instructions for any special requirements when installing the coil to the furnace.

2. Place field fabricated 4-in. minimum adapter on coil casing. Adapter should be tapered to fit coil/furnace combination when one of them is larger than the other.
3. Set furnace on adapter.

Fig. 3 ­ Downflow Installation with Coil Rotated 90° A170284A

Fig. 1 ­ Typical Horizontal Coil Installation

A05400A

Fig. 4 ­ Horizontal with Adapter

A170281A

Fig. 2 ­ Typical Vertical Coil Installation

A05401A

Downflow Coil Installation

IMPORTANT: Installing “A” coils rotated 90 degrees from the front of the furnace in downflow applications can cause water blow off or coil freeze up. This is due to the concentration of air on one coil slab or lack of air on the opposite coil slab. If the airflow is high due to ductwork or other causes, and there is a chance for water blow off, it is recommended that a 4-in. minimum field-supplied adapter be placed between the coil and the furnace to allow the air to distribute evenly to both coil slabs. See Fig. 3.

1. Set uncased coil in supply duct opening.

Fig. 5 ­ Vertical with Adapter

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 3

A170280A

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions
Horizontal Coil Installation
The unit can be installed on a work platform, secured to roof truss in attic, suspended from hangers on floor joists in crawl space, or installed on blocks. It is designed to allow airflow in either direction, to mate with horizontal- left or horizontal-right furnace installations. Ensure coil cabinet is level side to side and front to back. It is allowable to add up to 1/2-in. additional slope over length and depth of coil cabinet in the direction of drain pan connection. Horizontal-Right Installation 1. Use field fabricated attachment plates to secure coil to furnace. See
Fig. 6.
2. Use self-tapping screws to mount attachment plates to coil casing.

Fig. 7 ­ Condensate Pan Extension Cork Tape LocationA170282A

Fig. 6 ­ Horizontal-Right Installation

A13065A

3. Connect furnace snugly against coil casing.

4. Use self-tapping screws to attach furnace. See Fig. 6.

5. Seal joint between coil casing and furnace to create an air tight seal using locally approved materials.

6. Use cork tape to create air seal between the undersides of the pan extension and front of the vertical drain pan as shown in Fig. 7.

7. Install included condensate pan extension and two corner screws as shown in Fig. 7.

8. If coil is wider than furnace, use 4-in minimum transition and self tapping screws to attach furnace. See Fig. 4.

Horizontal-Left Installation

Use same steps as Horizontal-Right. See Fig. 8 and Fig. 9.

Fig. 8 ­ Horizontal-Left Installation

A13064

Fig. 9 ­ Horizontal-Left Installation
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 4

A13066A

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions
Refrigerant Line Connections
! WARNING
PERSONAL INJURY HAZARD Failure to follow this warning could result in personal injury. Wear eye protection. Coil is factory charged with 15 psi nitrogen. The coil is under pressure and TXV screen is in place behind liquid line plug. DO NOT remove liquid line plug first, always remove the suction line plug first to depressurize the coil.
NOTE: Factory nitrogen charge may escape past rubber plugs during storage. This does not indicate a leaking coil nor warrant return of the coil. Size and install refrigerant lines according to information provided with outdoor unit. Coil connection tube sizes are shown in the Product Data sheet. Route refrigerant lines to the coil in a manner that will not obstruct service access to the unit or removal of the filter. Do not use damaged, dirty, or contaminated tubing because it may plug refrigerant flow-control device. ALWAYS evacuate the coil and field-supplied tubing before opening outdoor unit service valves. Connect Refrigerant, Liquid, and Suction Lines For matched and mismatched systems, use line sizes recommended in outdoor unit Installation Instructions.
! CAUTION
UNIT OR PRODUCT DAMAGE HAZARD Failure to follow this caution may result in property damage. Take precautions to ensure Aluminum tubes do not come in direct contact or allow for condensate run off with a dissimilar metal. Dissimilar metals can cause galvanic corrosion and possible premature failure.
Mechanical Fittings IMPORTANT: Mechanical fittings must meet or exceed maximum operating pressure of 700 psig for evaporator coils. Follow mechanical fitting supplier’s instructions for installation. Brazed Fittings
! CAUTION
UNIT DAMAGE HAZARD Failure to follow this caution may result in product damage. To avoid valve damage to the refrigerant control device while brazing, valves must be wrapped with a heat-sinking material such as a wet cloth.
The coil can be connected to outdoor units using field-supplied tubing of refrigerant grade. Always evacuate tubing and reclaim refrigerant when making connections or flaring tubing. Leak check connections before insulating entire suction line. See Table 1 for coil connection tube size.
1. Remove cabinet access door. 2. Remove rubber plugs, suction plug then liquid plug, from coil stubs
using a pulling and twisting motion. Hold coil stubs steady to avoid bending or distorting. 3. Remove fitting door with rubber grommets and slide fitting door with grommets onto the refrigerant lines (field line-set), away from braze joints.

! CAUTION
UNIT DAMAGE HAZARD Failure to follow this caution may result in damage. All aluminum tubing and coils must be adequately shielded from any copper braze splatter.

4. For optimal performance, swedge stub outs according to the outdoor unit’s recommended lineset size. Wrap a heat sinking material such as a wet cloth behind braze joints.
5. Wrap TXV and nearby tubing with a heat-sinking material such as a wet cloth.
6. Use 1/2 psig Nitrogen purge in the suction and out the liquid line.
7. Braze using a Sil-Fos or Phos-copper alloy. Do not use soft solder.
8. After brazing, allow joints to cool. Carefully remove TXV bulb insulation and verify that the TXV bulb is securely fastened with hose clamp. Tighten screw a half-turn past hand tight with TXV bulb placed in the indentation with full contact with the vapor line tube. Re-wrap TXV bulb with insulation.
9. Perform a pressure check of the unit with a nitrogen charge of approx. 200psi. The nitrogen holding charge must not decrease in pressure for 1 hour.
10. Perform a leak check on the unit. Vacuum unit to 500 microns. When isolating the unit from the pump, the pressure shall not rise above 1000 microns in 7 minutes (Fig. 10).

MICRONS

5000 4500 4000 3500 3000 2500 2000 1500 1000 500

LEAK IN SYSTEM
VACUUM TIGHT TOO WET TIGHT DRY SYSTEM

01234 567 MINUTES

Fig. 10 ­ Deep Vacuum Graph

A95424

11. Slide fitting door with rubber grommets over joints. Position tubing at center of each grommet to ensure an air seal around the tube. Reinstall cabinet door.

TXV
NOTE: These TXV’s are equipped with mechanical connections. There is no brazing required.
A thermal expansion valve is utilized in this coil design to optimize performance and comfort throughout the entire cooling operating range of the system. Special attention needs to be taken to the TXV when installing the coil (Fig. 11): · Place liquid filter dryer near indoor unit to reduce the risk of debris
clogging the valve. · Make sure TXV bulb is securely fastened with a metal strap and
wrapped in the indentation on vapor line tube.
These specific coils have a factory-installed hard-shutoff TXV designed only for use with R-454B refrigerant. Use only with outdoor units designed for R-454B refrigerant.
NOTE: These TXV’s are factory set at approximately 10° superheat measured at the suction service valve, and are not field adjustable.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 5

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions

Metal Clamp ONLY

Sensing Bulb Sensing Bulb Indentation

Vapor Line

TXV
Insulation Wire Tie

UNIT
PRIMARY DRAIN

2″ MIN (51 mm)
2″ MIN (51 mm)

Fig. 12 ­ Recommended Condensate Trap

A03002A

TXV Insulation Wrap

Fig. 11 ­ TXV Bulb

A210138A

Condensate Drain

Units are equipped with primary and secondary 3/4″ FPT drain connections. It is recommended that PVC fittings be used on the plastic condensate pan. Do not over-tighten. Finger-tighten plus 1-1/2 turns. For proper condensate line installation review Fig. 12 and Fig. 13.

! CAUTION
UNIT OR PRODUCT DAMAGE HAZARD Failure to follow this caution may result in unit or product damage. BOTH primary and secondary drain lines should be installed and include properly sized condensate traps. Shallow, running traps are inadequate and do not allow proper condensate drainage. Use pipe dope. Do not over-torque. Hand tighten plus 1-1/2 turns.

NOTE: When connecting condensate drain lines, avoid blocking filter access panel, thus preventing filter removal. After connection, prime both primary and secondary condensate traps.
IMPORTANT: The owner of the structure must be informed that when condensate flows from the secondary drain, the unit requires servicing or else water damage will occur.
Optionally, a float switch may be used in lieu of a secondary drain. If so, make sure the float switch is installed so that it will trip before the water exits the weep hole between the drain pans. The float switch may be installed in the primary drain line or inside the pan. If installing in the secondary drain, make sure the float switch is below the exit of the drain.
NOTE: Do not install the float switch at the same level as the secondary drain exit. Install traps in the condensate lines as close to the coil as possible (Fig. 12). Make sure that the outlet of each trap is below its connection to the condensate pan to prevent condensate from overflowing the drain pan. Prime all traps and test for leaks.

DO NOT USE SHALLOW RUNNING TRAPS!

Fig. 13 ­ Insufficient Condensate Trap

A03013

Condensate drain lines should be pitched downward at a minimum slope of 1″ for every 10 feet of length. Consult local codes for additional restrictions or precautions.

NOTE: If unit is located in or above a living space, where damage may result from condensate overflow, a field-supplied, external condensate pan should be installed underneath the entire unit, and a secondary condensate line (with appropriate trap) should be run from the unit into the pan. Any condensate in this external condensate pan should be drained to a noticeable place. As an alternative to using an external condensate pan, some localities may allow the running of a separate 3/4 inch (19 mm) condensate line (with appropriate trap) per local code to a place where the condensate will be noticeable. The owner of the structure must be informed that when condensate flows from secondary drain or external condensate pan, the unit requires servicing or water damage will occur. To further protect against water damage, install a float switch to shut the unit off if the water in the secondary pan gets too high.

ELECTRICAL CONNECTIONS
This evaporator includes low voltage (24V) electrical equipment. ALL equipment must be installed for proper operation of the system and to prevent hazardous conditions per UL60335-2-40.

Leak Dissipation System
This unit is required to be installed with an R-454B leak detection and dissipation system (included with the evaporator coil). This system is comprised of a refrigerant sensor, sensor wire harness, leak dissipation control board, dissipation board housing, and power wire harness. Failure to install this system will result in potentially hazardous conditions and improper equipment operation, and void all system warranties and liabilities.
Refrigerant Sensor
The 5V refrigerant sensor will be factory installed inside of the evaporator coil. For proper operation, the sensor must remain in the factory installed location inside of the evaporator coil. Verify that the refrigerant sensor is installed in the correct location and orientation (Fig. 14).

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 6

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions
! WARNING
PRODUCT OPERATION / INJURY HAZARD Failure to follow this warning could cause property damage or personal injury. Make sure the sensor is not exposed to significant amounts of dust/dirt contamination. This could clog the sensor and prevent proper functioning. For sensor cleaning instructions, refer to service manual.
IMPORTANT: Sensor must be installed with the connector facing down or facing horizontally. Sensor should never be positioned with connector facing upward. Incorrect sensor position could result in premature failure.

Product Data sheet for details on the communicating plug for any communicating system.

Fig. 16 ­ Leak Dissipation Control Board

A230455

Dissipation Board Housing

The dissipation board housing (Fig. 17) (which contains the dissipation

control board) is required to be installed on a wall or unit as close as

possible to the furnace control box, within 8 feet (along the wire

harnesses) of the refrigerant sensor and the furnace control board.

Fig. 14 ­ R-454B Leak Sensor Mounting Location A230510 (all A-Coil Applications)
Sensor Wire Harness
The 8-foot-long sensor wire harness will be factory installed to the sensor inside of the evaporator coil. Verify that the sensor wire harness is connected to the refrigerant sensor (Fig. 14).

Fig. 17 ­ Dissipation Board Housing

A230456

Power Wire Harness

The 8-foot-long power wire harness will be included with the dissipation board (Fig. 18). Verify that the 8-pin connector is properly attached to the dissipation board during installation.

Fig. 15 ­ Sensor Wire Harness Pin Layout

A230454

Leak Dissipation Control Board

The leak dissipation control board will be factory installed inside of the dissipation board housing (Fig. 16, Fig. 17).

The dissipation board housing cover is clear, so the LED indicators can be viewed when servicing (Fig. 17). There are two LED indicators: one amber for system status; one green for communicating systems only.

NOTE: The Communicating (CCN) plug is not included with the evaporator coil. The technician will need to provide and install the CCN plug on the dissipation board for communicating systems. Reference

Fig. 18 ­ Front View of Power Wire Harness Pin Layout A230457
24V Control System Connection to the Unit
Wire 24V low-voltage R-454B leak detection and dissipation system in accordance with wiring label on the dissipation board housing cover. Refer to outdoor unit or furnace wiring instruction for any additional wiring procedure recommendations/requirements.
NOTE: For communicating outdoor units, wires 3­7 are unused. Cut and wire nut these individually.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 7

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions

Table 2 ­ Dissipation System Wiring Label

Pin

Color

1-Stage Label

2-Stage Label

1

Red

to Furnace SEC1

to Furnace SEC1

2

Grn/Vio

to Furnace G

to Furnace G

3

White

to TSTAT W

to TSTAT W1

4

Yel/Vio

to OD unit Y

to OD unit Y1

5

Yellow

to Furnace Y

to Furnace Y1

6

Green

to TSTAT G

to TSTAT G

7

White/Vio

to Furnace W

to Furnace W1

8

Black

to Furnace C

to Furnace C

Wiring Diagrams
NOTE: All dashed lines in wiring diagrams are field-supplied wires. All solid lines in wiring diagrams are provided with the respective unit.

Fig. 20 ­ Wiring Layout, 1-Stage Heat Pump Unit A230459

Fig. 19 ­ Wiring Layout, 1-Stage Air Conditioning Unit A230458
Fig. 21 ­ Wiring Layout, 2-Stage Air Conditioning Unit A230460
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 8

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions

Leak Dissipation System Installation

Fig. 22 ­ Wiring Layout, 2-Stage Heat Pump Unit A230461

R

R

NO USE

NO USE

C

C

C

C

DX-

DX-

DX-

DX-

DX+

DX+

DX+

DX+

Dissipation Terminal* GRN/VIO G_out

SEC-1

RED

24V

C

BLK

C

NOTE: Dissipation terminal is only used on communicating furnaces manufactured Q4 2023 and later. Use a 3/16″ spade connector on the GRN/VIO wire to connect to the dissipation terminal on communicating furnaces. Attach wire nut to all unused wires from the power harness.

Fig. 23 ­ Wiring Layout, Communication Unit

A240005

Table 3 ­ Communication Plug Designations

CCN Plug Connections

Color

GRN

YEL

WHT

RED

Signal

DX+

DX-

C

NO USE

! WARNING
PERSONAL INJURY HAZARD Failure to follow this warning could result in property damage, personal injury, or death. Operational checks to confirm proper dissipation system function must be performed prior to normal operation of the system.

1. After installing evaporator coil and line set, route the sensor cable through the liquid grommet on the fitting door. Ensure that the wire harness has tension relief and does not come into contact with sharp edges.
2. Mount the dissipation board assembly (control board, enclosure bottom, and enclosure top) as close as possible to the furnace control box. If drilling, check behind the drill location where mounting the dissipation board assembly to ensure no damage to hidden electrical or mechanical components. Mount enclosure in a vertical orientation with the harnesses coming out of the bottom, in a location that is easily accessible, and indicator light is visible. a. Do NOT mount control board assembly in a location where it could come into contact with or be exposed to water. b. Do NOT mount control board assembly inside of evaporator coil, furnace, or ductwork.
3. Remove control board housing cover and plug in sensor wire harness (4-pin connector) and power wire harness (8-pin connector) to the dissipation control board.
4. Route control board power harness (8 wires) to the furnace control box and make all connections according to wiring diagrams and wiring label.
5. Power on unit and verify proper functioning of equipment. Yellow LED on control board should be steady. If flash codes are present, see the troubleshooting section.
NOTE: For communicating systems, green LED should be on (steady or flashing).
IMPORTANT: Press the Test button for approximately ONE SECOND to enter Test Mode. Pressing the Test button for a longer period can possibly clear all fault code history.
6. Press the Test button on the dissipation system control board to ensure proper dissipation system operation under each test condition listed below (Table 5). After pressing the test button, system will enter dissipation mode for 60 seconds to help verify correct operation.
Table 4 ­ Dissipation Board Test Button Functions

Hold Button Time (sec) 1 – 4 5 – 29 30+
3 rapid presses

Function Dissipation Mode for 60 seconds
Display flash code history Flash code 6
Clear flash code history

7. Ensure that the furnace is able to meet the minimum required dissipation mode airflows. These required minimum airflow rates during dissipation mode are listed in Table 6. They are based on the total system refrigerant charge quantity.
If the minimum airflow is not achievable by energizing the continuous fan (G terminal), an accessory kit is available to achieve cooling airflow in dissipation mode. Refer to the Accessories section of the Product Data for current kit number.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 9

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions

Table 5 ­ Required Operational Checks to Ensure Proper Dissipation System Function

Normal Operation

Test #

T-Stat Call

Compressor Indoor Fan

Electric/Gas Heat

1

None

Off

Off

Off

2

Cool

On

On

Off

3

Heat

Off

On

On

Dissipation Activated

4

None

Off

On

Off

5

Cool

Off

On

Off

6

Heat

Off

On

Off

Table 6 ­ Required Minimum Dissipation Mode Airflows, based on Total System Refrigerant Charge Quantity

Total

Minimum Required

Total

Minimum Required

System Dissipation Airflow System Dissipation Airflow

Charge (lb)

(CFM)

Charge (lb)

(CFM)

5

133

16

426

6

160

17

452

7

186

18

479

8

213

19

505

9

239

20

532

10

266

21

559

11

293

22

585

12

319

23

612

13

346

24

639

14

372

25

665

15

399

TROUBLESHOOTING
Sequence of Events — Dissipation Mode
1. Refrigerant leaks. 2. Sensor detects leak. 3. Dissipation board sends system in to Dissipation Mode (energizes
G; de-energizes Y and W). Dissipation board displays Flash Code 1 until refrigerant concentration decreases, at which point Flash Code 3 is displayed. 4. Dissipation Mode continues for at least 10 minutes. 5. 5-minute ON delay for system equipment is enabled. 6. System resumes normal operation.
Flash Codes / Actions
For all flash codes, first try power cycling the system to remove the code.

No power Verify the wiring to/from pins 1 and 8 on the power harness plug. Check the 24V system wiring from the transformer.
Flashing 1 Check for refrigerant leaks using an independent R-454B detector. If no leaks are present, replace the sensor.
Flashing 2 Check both ends of the sensor wire harness to ensure proper attachment. Power cycle the system to check whether the flash code has been removed. If the flash code is still present, replace the sensor.
Flashing 3 Check for refrigerant leaks using an independent R-454B detector.
Flashing 4 If the code does not clear after power cycling the system, replace the dissipation board.
Flashing 5 If the code does not clear after power cycling the system, replace the sensor.
Flashing 6 Press the test button repeatedly. Power cycle the system. If the button cannot be reset, replace the dissipation board.
Flashing 7 Verify wiring of all “Y” and “W” wires in the applicable wiring diagram.
Flashing 8 Verify wiring of all “Y” and “W” wires in the applicable wiring diagram.

Table 7 ­ Flash Code Chart

Yellow LED

Reason

Mode

Solid

Normal Operation

Normal Operation

Flashing 1

Sensor >= 20% LFL

Dissipation

Flashing 2

Sensor Open

Dissipation

Flashing 3 Normal Dissipation after Leak

Dissipation

Flashing 4

No Power to G Output Dissipation with no Blower

Flashing 5 Fault with A2L Digital Sensor

Dissipation

Flashing 6 Test Button Stuck (>30 s)

Dissipation

Flashing 7

Y or W Wiring Inverted

Normal Operation

Flashing 8

Y or W Shorted

Normal Operation

UNIT START-UP
Refer to outdoor unit Installation Instructions for system start-up instructions and refrigerant charging method details.
! CAUTION
UNIT OR PRODUCT DAMAGE HAZARD Failure to follow this caution may result in unit or product damage. Never operate the unit without a filter. Damage to the blower motor or coil may result. For those applications where access to an internal filter is impractical, a field supplied filter must be installed in the return duct system.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 10

Evaporator A-Coil, Cased, Multipoise for R-454B Refrigerant: Installation Instructions
CARE AND MAINTENANCE
To continue high performance and minimize possible equipment failure, it is essential that periodic maintenance be performed on this equipment. Consult your local dealer as to the proper frequency of maintenance and the availability of a maintenance contract. The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these, contact your dealer for maintenance. The only consumer service recommended or required is filter replacement or cleaning on a monthly basis.
! CAUTION
ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage. Remove and recycle all components or materials (i.e., oil, refrigerant, etc.) before unit final disposal.

© 2024 Carrier. All rights reserved. A Carrier Company

Edition Date: 2/24

Catalog No: IM-EAM5X-W5AM-01 Replaces: New

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

11

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