Table of Contents
Should you insulate refrigerant lines?
Liquid lines generally are insulated. They are warm to hot (110°F (43.3°C) for air-cooled). If liquid lines pass through a space that is warmer than the refrigerant (i.e. the roof of a building at roof level), or if they could be considered hot enough to pose a safety risk, then insulation should be added.
What type of insulation is used for refrigerant lines?
The ASHRAE Handbook recommends cellular glass, closed-cell elastomeric, closed-cell phenolic, polystyrene, and polyisocyanurate insulation for refrigeration system applications. These insulation types share a few characteristics: closed-cell structure, low water absorption, and low WVT.
Does insulating AC lines help?
Insulation benefits and recommended type for AC: In refrigeration and air-conditioning applications, insulation needs to be able to protect against condensation. Moisture control is critical to thermal efficiency. If moisture intrudes the insulating material surrounding cold-water piping, thermal efficiency is lost.
What happens if the suction line is not insulated?
If the return line is not insulated, the refrigerant returning from evaporator to the compressor will absorb some heat, more heat than it had at the outlet of the evaporator. This extra heat will also be present in the compressed refrigerant going to the condenser, downstream of the compressor.
How do you seal refrigerant lines?
How To Seal Around HVAC Lines
- Remove Debris from Gap.
- Purchase Caulk, Caulk Gun, and Spray Foam.
- Load and Prep Caulk Gun and Test Applicator.
- Fill Gap with Silicone Caulk or Spray Foam.
- Remove Excess Material.
- If Desired, Paint to Match or Finish.
Which insulating material is most widely used in refrigerators?
Polyurethane rigid foam
Polyurethane rigid foam is the insulating material which is most widely used throughout the world for refrigerators and freezers. The insulation efficiency of polyurethane foams is a key property for the low temperature preservation of food during processing, storage and distribution to the consumer.
What is the minimum insulation value on refrigerant piping?
1 In general, refrigerant suction lines and chilled water pipes require either 1/2″ or 1″ insulation depending on the size and temperature of the pipes. 2 Hot pipes require anywhere from 1″ to 5″ of insulation depending on size and temperature. In addition to the insulation thickness, section 6.4.
What is the required thickness of insulation on a refrigeration suction line?
The suction line of a refrigeration system is normally insulated with a flexible, closed-cell elastomeric material. Wall thicknesses vary between 3/8- and 1-inch. Medium-temperature systems generally require ½- to ¾-inch insulation. Low-temperature systems generally require ¾- to 1-inch insulation.
How do you insulate an AC unit?
Tape a plastic bag around the unit and return the outer cover. Alternatively, you can buy a fabric cover designed to fit a window AC. Place the cover right over the unit’s outside cover to protect it from precipitation like heavy rains and snow. Thankfully, the fabric covers are available in most hardware stores.
What is the purpose of insulation on the suction line?
Insulating the suction line is done to prevent condensate from developing and dripping off. This condensate drip can cause water damage to the material under it or cause a slip hazard for people walking below it.
What is AC insulation made of?
There are several available options for insulation material: fiberglass, foam rubber, and polyethylene foam. The best of these is polyethylene foam. Installation is easy, as the foam is split down the length of the insulation and the edges are covered in a sticky adhesive.
What is the insulation thickness for refrigerant pipes?
American-manufactured flexible elastomeric insulation typically meets all of the above standards up to 2” thick (ASTM E84 25/50).
How cold should the refrigerant line be?
The suction temperature should be above 35°F and below 65°F entering the compressor and the discharge line temperature should be below 220°F and above 150°F (typically) on a properly functioning package unit.
What is HVAC tape?
What Is & How Does HVAC Tape Work? HVAC Tape works the same way you’d use tape to seal or fix an item that was broken. In the case of HVAC tape, it is the only type of tape that will work on air ducts. If your ductwork is not sealed correctly, your home will be less energy efficient.
What happens when refrigerant lines are not insulated?
Missing refrigerant line insulation also may increase system operating cost or in addition to a condensation worry, uninsulated high pressure refrigerant lines may result in unwanted heat transmission into some building areas..
What is the best type of refrigerant line insulation?
Rubatex is the most common form of refrigerant line insulation. – Thanks to professional home inspector Stephen Stanczyk in Washington State ([email protected]) for editing assistance. Liquid lines generally are insulated. They are warm to hot (110°F (43.3°C) for air-cooled).
How do you insulate the refrigeration line?
The manufaturer (Sanyo) recommends covering the foam insulation on the refrigeration line with weatherproof tape which we did at the end of this job. I admit that we “over-designed” the final insulation job shown in our last photo with that extra layer of foam that surrounds both lines, as we used more thickness of insulation than necessary.
What is the standard thickness of refrigerant line insulation?
Mandated changes in refrigerants are resulting in colder line temperatures, which require increased insulation thickness to prevent condensation. In typical conditions, a 1-inch thickness is the standard; however, in some cases where humidity is high (over 80 percent), a 1½-inch thickness may be used.