Marvair 70656 Switch
The Marvair 70656 High Pressure Switch is an essential OEM safety component designed for high-side protection in specialized environmental control units and commercial HVAC systems. This High Pressure Cutout Switch features a normally closed (N/C) configuration, engineered to interrupt the compressor contactor circuit when head pressures reach critical levels. With a high-limit 660 PSI cutout and a 450 PSI reset, this Marvair replacement part prevents catastrophic compressor failure and refrigerant discharge during condenser fan failure or coil fouling. As a fixed-setting pressure switch, it eliminates the need for field calibration, ensuring the system operates within precise manufacturer parameters for telecommunications shelters and modular builds.
Key Benefits for Contractors:
- System Integrity: The 660# OFF / 450# ON calibration provides a wide differential to prevent short-cycling of the compressor during high-ambient operation.
- Direct Compatibility: Engineered specifically as a Marvair 70656 drop-in replacement, ensuring proper thread fit and electrical terminal alignment.
- Rugged Construction: Designed to withstand the vibration and thermal cycling common in industrial refrigeration and wall-mount HVAC applications.
- Safe Failure Mode: The normally closed (N/C) logic ensures that if a wire is damaged or the switch fails, the system defaults to a safe "off" state to protect the refrigerant circuit.
Common Technical Questions:
Is the Marvair 70656 an automatic or manual reset switch?
This is an automatic reset high pressure switch. It will automatically re-close the circuit once the high-side pressure drops below the 450 PSI threshold.
What refrigerant types are compatible with this switch?
While commonly used in R-410A systems due to the high 660 PSI trip point, always verify that your specific Marvair HVAC unit matches the pressure ratings listed on the system data plate.
Can this switch be used on the suction side?
No, this is specifically a high pressure control. Using this on the low-side would prevent the system from ever running, as its operating range is designed for high-side discharge pressures.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Marvair 70656 Switch
The Marvair 70656 High Pressure Switch is an essential OEM safety component designed for high-side protection in specialized environmental control units and commercial HVAC systems. This High Pressure Cutout Switch features a normally closed (N/C) configuration, engineered to interrupt the compressor contactor circuit when head pressures reach critical levels. With a high-limit 660 PSI cutout and a 450 PSI reset, this Marvair replacement part prevents catastrophic compressor failure and refrigerant discharge during condenser fan failure or coil fouling. As a fixed-setting pressure switch, it eliminates the need for field calibration, ensuring the system operates within precise manufacturer parameters for telecommunications shelters and modular builds.
Key Benefits for Contractors:
- System Integrity: The 660# OFF / 450# ON calibration provides a wide differential to prevent short-cycling of the compressor during high-ambient operation.
- Direct Compatibility: Engineered specifically as a Marvair 70656 drop-in replacement, ensuring proper thread fit and electrical terminal alignment.
- Rugged Construction: Designed to withstand the vibration and thermal cycling common in industrial refrigeration and wall-mount HVAC applications.
- Safe Failure Mode: The normally closed (N/C) logic ensures that if a wire is damaged or the switch fails, the system defaults to a safe "off" state to protect the refrigerant circuit.
Common Technical Questions:
Is the Marvair 70656 an automatic or manual reset switch?
This is an automatic reset high pressure switch. It will automatically re-close the circuit once the high-side pressure drops below the 450 PSI threshold.
What refrigerant types are compatible with this switch?
While commonly used in R-410A systems due to the high 660 PSI trip point, always verify that your specific Marvair HVAC unit matches the pressure ratings listed on the system data plate.
Can this switch be used on the suction side?
No, this is specifically a high pressure control. Using this on the low-side would prevent the system from ever running, as its operating range is designed for high-side discharge pressures.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Marvair 70656 High Pressure Switch is an essential OEM safety component designed for high-side protection in specialized environmental control units and commercial HVAC systems. This High Pressure Cutout Switch features a normally closed (N/C) configuration, engineered to interrupt the compressor contactor circuit when head pressures reach critical levels. With a high-limit 660 PSI cutout and a 450 PSI reset, this Marvair replacement part prevents catastrophic compressor failure and refrigerant discharge during condenser fan failure or coil fouling. As a fixed-setting pressure switch, it eliminates the need for field calibration, ensuring the system operates within precise manufacturer parameters for telecommunications shelters and modular builds.
Key Benefits for Contractors:
- System Integrity: The 660# OFF / 450# ON calibration provides a wide differential to prevent short-cycling of the compressor during high-ambient operation.
- Direct Compatibility: Engineered specifically as a Marvair 70656 drop-in replacement, ensuring proper thread fit and electrical terminal alignment.
- Rugged Construction: Designed to withstand the vibration and thermal cycling common in industrial refrigeration and wall-mount HVAC applications.
- Safe Failure Mode: The normally closed (N/C) logic ensures that if a wire is damaged or the switch fails, the system defaults to a safe "off" state to protect the refrigerant circuit.
Common Technical Questions:
Is the Marvair 70656 an automatic or manual reset switch?
This is an automatic reset high pressure switch. It will automatically re-close the circuit once the high-side pressure drops below the 450 PSI threshold.
What refrigerant types are compatible with this switch?
While commonly used in R-410A systems due to the high 660 PSI trip point, always verify that your specific Marvair HVAC unit matches the pressure ratings listed on the system data plate.
Can this switch be used on the suction side?
No, this is specifically a high pressure control. Using this on the low-side would prevent the system from ever running, as its operating range is designed for high-side discharge pressures.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
