7 Facts on Heat Pump Filter Drier: What, Size, Type, Replacement

A critical characteristic of a system of air conditioning is a filter drier. Let us discuss the details, such as size, type, and replacement, regarding heat pump filter driers.

Every filter drier should be replaced every two years or as recommended by the manufacturer. Manufacturers often include a filter drier with every new home comfort system they sell due to how important they are.

The receiver drier in an auto air conditioning system serves as a holding tank for liquid refrigerant to be fed to the TX valve, screens foreign objects, and burns moisture from refrigerant. We will gain insight into a range of topics in this piece, like the definition of a heat pump filter drier and several filter drier kinds.

What is heat pump filter drier?

Every filter drier should be changed every 1.5 years or as directed by the manufacturing company. Let us see how to define a heat pump filter drier.

HVAC unit appliances called filter driers, which integrate the activities of a drier with a filter, is used in HVAC systems. Any particles, including metal or metal chips, are stopped from entering the refrigerant flow control by using a filter.

Mitsubishi Heat Pump circuit board.agr
Image – Heat pump;
Image Credit – “Mitsubishi Heat Pump circuit board “by ArnoldReinhold is licensed under CC-BY-SA-4.0

The thermostatic expansion valve or a straightforward capillary tube might both be used as the refrigerant flow control mechanism.

Does a heat pump need a filter drier?

Filter driers often serve a dual purpose in the liquid line of a dry expansion refrigeration unit. Let us find out if a heat pump needs a filter drier.

Every single heat pump ought to feature a minimum of one filter drier. Contaminants should be kept to a minimum to ensure long-term system life. This is especially true for demanding applications like heat pumps.

A heat pump’s filter drier collects coarse particulate pollution, copper scraps, and any humidity the system may possess.

Heat pump filter drier location

The heat may reduce just several degrees if the filter drier is completely obstructed. Let us go through where the filter drier is located in a heat pump.

Heat pump filter direction is one in the outdoor area and one in the indoor section of a standard drier. Both are frequently put directly in front of the expansion device. Another typical layout places both drier in the outdoor seating area, where maintenance is simpler.

Due to the low temperature of the refrigerant leaving a thoroughly blocked filter drier, there will be a huge temperature reduction over it and maybe cold snap.

Heat pump filter drier size

The filter drier should be put on the heat pump system near to the measuring device being used first for start-up. Let us check the size of the heat pump filter drier.

Model NameMolecExternal DiameterLength
Tolerances± 5%± 0.10%± 3.00%
CF 52.00Φ16.0080.00
CF 77.00Φ16.0090.00
CF 7.57.50Φ16.0096.00
CF 88.00Φ16.00101.00
CF 1010.00Φ16.00115.00
CF 10A1.00Φ19.00100.00
CF 1212.00Φ19.00105.00
CF 1313.00Φ19.00110.00
CF 1515.00Φ19.00115.00
CF 1818.00Φ19.00128.00
CF 2020.00Φ19.00141.00
CF 20A20.00Φ24.00120.00
CF 2525.00Φ24.00125.00
CF 3030.00Φ24.00140.00
CF 3535.00Φ24.00155.00
CF 4040.00Φ24.00170.00
CF 5050.00Φ29.00160.00
Different types of heat pump filter drier and their respective size

The filter drier should be located in close proximity to the domestic condenser in cooling-only systems. The best way to guarantee that no residue enters the metering devices is to do this.

Filter drier types and cost

Not every filter drier is created in the same way. Let us examine price ranges and filter drier types.

Different types of heat pump filter drierRespective costMaterialAutomation GradeDesignApplication
1. 98 % Synthetic Fiber Air Drier Filter85000 per pieceMild SteelAutomaticStandardFilter air  
2. Standard Agitated Nutsch Filter Drier Anfd1.50 lakhs per pieceMild SteelAutomaticStandardFilter air  
3. DC 48 Danfoss Filter Drier Core850 per pieceMild SteelAutomaticStandardFilter air  
4. Mild steel semi automatic replaceable core sheel2800 per pieceMild steelSemi automaticStandardIndustrial
5. Copper Standard Automatic Danfoss DML Filter Drier for Chiller Water Fcu750 per pieceCopperAutomaticStandardChillers water fcu
6. Copper Drier Filter For refrigeration part  1575 per piece  Copper  Automatic  Standard  Refrigeration parts  
7. Agitated Nutsche Filter Drier  5 Lakhs per piece  Stainless Steel  Automatic  Standard  Pharmaceutical Industry  
8. Black PVC Filter Driers250 per piece  PVC  Automatic  Standard  Filter air  
9. Filter Drier26000 per pieceMild steelAutomaticStandardFilter air
10. Danfoss Steal Filter Drier500 per pieceMild steelAutomaticStandardFilter air
Different types of heat pump filter drier, their features,and respective cost

An arrow on the casing of the filter drier will let users know when they are installing a new filter drier which way the refrigerant should flow. The filter drier will no longer function if it is fitted incorrectly.

The symptoms of heat pump filter drier replacement

After every wash, drier filters should be cleaned. Let us just go over the signs of replacing the heat pump filter drier in more depth.

  • Strange noises
  • Rising energy costs
  • Safety concern
  • The filter drier requires ongoing maintenance.
  • Upwards of ten years old.

Strange noises

If the operator is aware of the difference between typical and unsettling noises made by the heat pump as it functions, it is time to get the heat pump system evaluated if consumers hear odd noises. It can indicate that it should be replaced.

Rising energy costs

The heat pump is not using energy effectively if the operator is not changing anything despite increased electricity bills. A heat pump replacement can assist in reducing those energy expenses if the operator’s heating system is working harder to offer the same quantity of warmth and cooling.

Safety concern

The owner of the heat pump and their family may face major health risks if the heat pump has a carbon monoxide leak. If the heating unit has a leak, a filter drier should be installed in its stead.

The filter drier requires ongoing maintenance

The heat pump filter drier needs occasional maintenance due to normal wear and tear as it matures. However, the heat pump can proceed in a timely manner if the operator fixes the filter drier appropriately.

Upwards of ten years old

Heat pumps have a life of 10 to 15 years on average. The efficiency of the system filter drier for heating and cooling the operator’s residence has decreased if it has seen double digit variations. Higher efficiency ratings on newer models can help operators reduce their monthly electricity costs.

If the user uses fabric softener sheets in the drier, the filter may become blocked. Clean the filter drier of any lint before pouring a tiny amount of water onto the filter’s screen to test it.

How often and when heat pump drier should be replaced?

  • The heat pump drier has to be changed when increasing heat.
  • The heat pump drier has to be repaired if the air is warmer than normal discharge temperature.
  • Replace any heat pump drier with a low amp draw.
  • The heat pump drier has to be upgraded if there is a low condensation pressure.
  • A new heat pump filter drier is required split low-condenser.
  • After the restriction, the heat pump filter drier needs to be changed a brief local cold snap or frost is possible.
  • A drier with a heat pump has to be serviced the pressure in the evaporator is too low.
  • It is time to switch out the heat pump filter drier the condenser’s sub-cooling is normal to somewhat higher.

What happens if heat pump filter drier is not replaced?

  • If a heat pump filter dryer is not changed and a new air filter is not being used, the furnace will overheat each time it runs.
  • A heat pump filter drier can fast rust by if it is not replaced, leak coolant from the heating system, and possibly permanently ruin other system parts like the compressor.
  • The pressure loss will be greater than 2 pound force per square inch if the heat pump filter drier is not repaired.

Reversible heat pump filter drier

Molecular sieve and activated alumina are the two primary types of desiccant used in filter dries. Let us see more about the heat pump filter drier that is reversible.

The reversible heat pump filter drier is a bi-flow liquid line filter drier that is typically utilized in heating and cooling equipment. Internal check valves in the steel shell filter dryer, which was designed expressly for these uses, eliminate the need for external check valves.

Integrated check valves facilitate flow through the drier in either direction while preventing contaminants that have previously been filtered out from escaping.


From this article, we can conclude that the filter drier needs to be positioned in the suitable location, which varies depending on the type of cooling system, in order to function properly. If you don’t do this, the adsorbent particles can get displaced and the cooling system might cease to work adequately.