Mastercool 90065 4 CFM 2-Stage Vacuum Pump with Solenoid Valve for HVAC

Elite Performance: High-Capacity Power with Solenoid Valve Protection

The Mastercool 90065-220-SV combines high-capacity professional performance with critical solenoid valve protection and elite ball bearing design. With 119 litres per minute displacement, two-stage vacuum capability, and automatic oil backflow prevention, this is the premium choice for technicians who demand both power and protection on medium to large HVAC systems.

Solenoid Valve Protection: Essential for High-Capacity Work

The integrated solenoid valve automatically closes when the pump stops, preventing oil from flowing back into the A/C system during power failures, accidental shutdowns, or when switching off the pump. On a high-capacity pump like the 90065, this protection is even more critical — the larger oil reservoir means more potential contamination if backflow occurs.

Why This Matters on High-Capacity Pumps: Larger pumps hold more oil (531ml in the 90065), which means a power failure without solenoid protection could push significant amounts of oil back into your freshly evacuated system. The SV model eliminates this risk entirely, protecting both your work and your customer's expensive equipment.

Elite Ball Bearing Design

The 90065-220-SV features elite ball bearing construction for superior durability and extended service life. Ball bearings reduce friction, run cooler, and last longer than standard sleeve bearings — essential for a high-capacity pump that may run for extended periods on large systems.

High-Capacity Two-Stage Performance

With 119 litres per minute displacement at 50Hz, the 90065-SV evacuates medium to large systems quickly and efficiently. The two-stage design achieves 25 microns ultimate vacuum — more than adequate for professional refrigeration work. Perfect for systems with 1 to 4.5 kg charge capacity.

Professional Features for Demanding Work

• Solenoid Valve — Automatic protection against oil backflow during power failures or shutdowns
• Elite Ball Bearing Design — Superior durability, reduced friction, extended service life
• Manifold Isolation Valve — Isolates pump from system for leak testing
• Three Inlet Ports — 1/4" SAE, 3/8" SAE, and 1/2" ACME (for automotive R134a systems)
• Gas Ballast Valve — Helps prevent oil contamination from high moisture content
• Advanced Cooling System — High-volume fan and cooling fins maintain optimal temperature
• Easy Maintenance — Removable vapour discharge/oil fill port and accessible drain valve (531ml oil capacity)
• Oil Level Monitoring — Large sight glass with max/min indicators
• Thermal Protection — Motor protection with on/off rocker switch
• Check Valve Protection — Prevents oil back-flow during normal operation

Durable Construction for Professional Use

• Refined Cartridge Machining — Improved surface finish extends pump life
• Expanded Internal Oil Path — Minimises friction and heat buildup
• Upgraded Seals — Ensures maximum vacuum performance down to 25 microns
• U.S. Designed and Tested — American engineering with proven reliability
• Robust 1/3 HP Motor — Powerful, efficient, and thermally protected

Built for Field Reliability

• Portable Design — Easy-grip handle and reinforced base (13.2 kg)
• Professional Footprint — 37 x 15.5 x 27.5 cm dimensions
• 220V 50/60Hz Power — UK/European standard (Schuko cable)
• Multiple Connection Options — Manifold with 1/4" SAE, 3/8" SAE, and 1/2" ACME ports

Technical Specifications

• Stages: Two-stage
• Free Air Displacement: 119 lit/min (50 Hz), 142 lit/min (60 Hz)
• Ultimate Vacuum: 25 microns*
• Motor: 1/3 HP, 1425 RPM (50 Hz), 1725 RPM (60 Hz)
• Power: 220V, 50/60 Hz (Schuko cable)
• Weight: 13.2 kg (29 lbs)
• Dimensions: 37 x 15.5 x 27.5 cm
• Oil Capacity: 531 ml (18 oz)
• Connections: Manifold with 1/4" SAE, 3/8" SAE, 1/2" ACME ports
• System Capacity: 1 to 4.5 kg charge capacity
• Features: Solenoid valve, elite ball bearing design, manifold isolation valve, gas ballast valve, check valve, three inlet ports

Service Information

• Oil Capacity: 531 ml (18 oz)
• Replacement Cartridge: 90165-R
• Seal Service Kit: 90062-11-SEAL
• Recommended Oil: Mastercool vacuum pump oil (90018-6 or 90024-6)

When Solenoid Valve Protection is Essential

• Unstable Power Supply — Job sites with unreliable mains power or generator use
• Mobile Service Work — Risk of accidental disconnection or power interruption
• High-Value Systems — Premium installations where contamination risk is unacceptable
• Large System Work — Extended evacuation times increase power failure risk
• Quality Assurance — Businesses with strict contamination prevention protocols
• Commercial Installations — Professional reputation protection
• Peace of Mind — Automatic protection eliminates human error

The Premium High-Capacity Choice

The 90065-220-SV represents the pinnacle of high-capacity vacuum pump design. You get professional 119 lit/min performance with 25-micron capability, plus the critical protection of a solenoid valve and the durability of elite ball bearing construction. This is the pump for busy technicians who work on medium to large systems and cannot afford contamination incidents or premature pump failure.

Perfect for:

• Professional HVAC technicians requiring contamination protection on large systems
• Mobile service work with power interruption risk
• High-value commercial installations
• Multi-zone heat pump systems
• Walk-in cooler and freezer service
• Quality-focused businesses with strict service standards
• Job sites with unstable power supply
• Technicians who demand both capacity and protection

SV vs Standard: Worth the Investment?

The solenoid valve and elite ball bearing design add to the cost of the standard 90065-220. Consider this: a single contamination incident on a large commercial system requiring refrigerant replacement and system flushing can cost hundreds in materials and labour, plus potential reputation damage. The SV model pays for itself the first time it prevents contamination, whilst the ball bearing design extends pump life significantly.

*Note: Micron readings represent optimal laboratory conditions. Field conditions may vary.

Elite ball bearing design with solenoid valve protection. Built to last, designed to protect. Technical documentation and parts lists available for download above.