Carrier 340620-4 TXV Furnace Fan Coil Replacement Kit Instruction Manual
- June 12, 2024
- Carrier
Table of Contents
**Carrier 340620-4 TXV Furnace Fan Coil Replacement Kit
**
NOTE: Read the entire instruction manual before starting the installation.
Safety considerations
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause 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 cloth for brazing operations. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and the National Electrical Code (NEC) for special requirements.
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
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing system, always turn off main power to system.
There may be more than one disconnect switch. Turn off accessory heater power
if applicable. ! WARNI
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury.
This coil contains nitrogen precharge of up to 15 PSI. Release of this
pressure through the center of the rubber plugs is required before removing
the plugs.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this warning 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.
Table 1 – Kit Contents
| Item | Description |
|---|---|
| 1 | TXV |
| 2 | Clamp |
| 3 | Warranty Return Tag |
| 4 | Teflon Washer (Not in all kits) |
| 5 | Installation Instructions |
Installation
IMPORTANT: UPON CHANGING THE TXV, the Liquid Line FILTER DRIER (not provided in kit) must be replaced.
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Recover the refrigerant or pump down into the outdoor unit.
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Remove coil access panels from cabinet.
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Remove the TXV support clamp.
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With a backup wrench in place, Loosen TXV hex nut and separate the TXV from the distributor.
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Ensure the Teflon washer has been removed from the distributor connection (Fig. 1).
A230317
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Remove the bulb from the suction header by cutting the clamp.
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Remove or cut the 1/8″ OD copper equalizer line from the suction header.
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Cut the connection between the liquid line and TXV with a tubing cutter. Leave enough length on stub to connect new TXV.
NOTE: If the TXV has a mechanical fitting, then—with a backup wrench in place—loosen the TXV hex nut and separate the TXV from the liquid line (Fig. 2).
A230413
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Once the existing TXV has been removed, attach the TXV Warranty tag (with the supplied plastic wire tie) from the kit to the failed TXV. Fill out the warranty tag and place the tag and TXV in the replacement box for return
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Prior to brazing, wrap the TXV with an appropriate heat-sink material such as a wet cloth. Be sure the heat-sink material is behind the braze joint.
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Attach the TXV inlet tubing to liquid line and braze connection. After brazing, allow joint to cool before continuing.
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The distributor used on the all-aluminum coils is also made of aluminum. The TXV connection to the distributor is accomplished with a ¾” Chatleff nut. The threads are coated with Loctite Heavy Duty Anti-Seize which is a graphite/calcium fluoride formulation, for applications that is free from copper, lead and sulfur. This product is typically used in applications with an operating range of -20°F to +2400°F. When replacing a TXV it is recommended to reapply with the same thread sealer.
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Once cooled, attach the TXV outlet hex nut to the distributor. Make sure the Teflon washer (included in kit) is seated properly within the distributor. Use a backup wrench to prevent damage to the tubing.
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Attach the TXV support clamp.
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Position the replacement TXV bulb at the same location as the original bulb. Insulate the bulb with field supplied insulation wrap.
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Flare Style Equalizer Tube: It is suggested that extra care be taken during brazing of copper equalizer on the aluminum coils to prevent the braze material from splattering on the aluminum. Also, route the copper equalizer so that it doesn’t touch the aluminum components. Mechanical Fitting Equalizer Tube: The suction used on the all-aluminum coils is also made of aluminum. The TXV connection to the distributor is accomplished with a ¾” Chatleff nut. The threads are coated with Loctite Heavy Duty Anti-Seize which is a graphite/calcium fluoride formulation, for applications that is free from copper, lead and sulfur. This product is typically used in applications with an operating range of -20°F to +2400°F. When replacing a TXV it is recommended to reapply with the same thread sealer.
-
Check the system for leaks and recharge the system.
NOTE: TXV’s have similar connections. Images shown may not depict actual part
© 2023 Carrier. All rights reserved.
Edition Date: 07/23
Catalog No: IIK-340620-01
A Proud Member of the Carrier Family
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Documents / Resources
|
Carrier 340620-4 TXV Furnace Fan Coil Replacement
Kit
[pdf] Instruction Manual
340620-4, 340620-4 TXV Furnace Fan Coil Replacement Kit, TXV Furnace Fan Coil
Replacement Kit, Fan Coil Replacement Kit, Coil Replacement Kit
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