Resideo (Honeywell) AEL-222201 Automatic Expansion Valve – AEL 1.0 | 1-7 bar Constant Pressure, 6 mm × 10 mm ODF

Resideo (Honeywell) AEL-222201 is an automatic expansion valve (constant pressure valve). The difference from a thermostatic valve: it does not operate according to superheat but according to evaporating pressure — it keeps the evaporator pressure constant at the set value. It opens when the load drops and throttles when the load increases; this keeps the evaporator pressure, and therefore its temperature, constant.

Constant Evaporating Pressure: Stable Cooling at Small Capacity

According to the official Honeywell documentation, the AEL series is designed for systems with single-injection evaporators without a distributor: air conditioners, dehumidifiers, air dryers, water coolers and ice machines. Load is highly variable in these applications; while a thermostatic valve goes into hunting, a constant pressure valve keeps the evaporator stable and prevents freezing.

AEL 1.0 is one of the small sizes in the series — it gives a rated capacity of 2.0 kW with R22 and 1.4 kW with R134a/R404A. It is suitable for small water coolers, mini dehumidifiers and low-capacity display units.

Technical Specifications (Official Honeywell Product Data)

• Model: Resideo (Honeywell) AEL-222201 | Valve Size: AEL 1.0 | Orifice: 1.0
• Type: Automatic expansion valve — fixed orifice, adjustable evaporating pressure
• Rated Capacity: R22 2.0 kW · R134a 1.4 kW · R404A 1.4 kW · R507A 1.4 kW
• Capacity Condition: t₀ = +4 °C, t𝚌 = +38 °C, 1 K subcooling of the liquid entering the valve
• Evaporating Pressure Range: 1 – 7 bar(a) | Factory Setting: 2.2 bar(a)
• Connections: Inlet 6 mm ODF × Outlet 10 mm ODF (metric copper tube, solder)
• Max. Pressure: PS 25.5 bar(a) | Test Pressure: PF 28 bar(a)
• Max. Ambient Temperature: 100 °C
• Dimensions: C 58 · D 36 · E 106 · F 54 mm | Weight: ≈0.16 kg — official dimension drawing in the 2nd image
• Material: Brass body · stainless steel head and stainless diaphragm welded under protective gas · copper connection tubes
• Compatible Refrigerants: All CFC, HCFC and HFC refrigerants — NOT for use with ammonia (NH₃)

Adjustment and Installation

• 🔧 Adjusting screw: One full turn changes the evaporating pressure by approximately 0.8 bar. Clockwise = pressure increases, counterclockwise = pressure decreases. Turn in small steps and verify with a pressure gauge.
• Can be mounted in any position — horizontal or vertical makes no difference.
• 🔥 The body must not exceed 100 °C during brazing. Cool it with a wet cloth; excessive heat permanently damages the diaphragm and the adjusting spring.
• Remove the plastic cap before brazing — it melts and sticks to the valve.
• No structural modification may be made to the valve (drilling, welding, machining of the body) — the manufacturer explicitly prohibits this.
• ⚠️ Check the connection size: This model is metric (6 × 10 mm). If an inch connection is required, choose the AEL-222211 (1/4" × 3/8") model with the same capacity — it is also available on our site.