Ranco
Ranco O12-4833 Dual Pressure Control HVAC 24/240 V 12-50 psi 150-450 psi
Compact dual pressure control for HVAC systems with 12–50 psi low-side and 150–450 psi high-side ranges at 24/240 V
- Low-side control from 12 in Hg to 50 psi
- Adjustable low-side differential up to 35 psi
- High-side range spans 150 psi to 450 psi
- High-side differential adjustable to 70 psi
- Operates on 24 V or 240 V supplies
Compact dual pressure control for HVAC systems
The Ranco O12-4833 is a dual pressure control designed for HVAC applications operating on 24 to 240 V supplies. It manages both low-side and high-side refrigerant pressures in a single compact housing. Technicians use it on residential and light commercial equipment where separate low and high pressure switches would otherwise be required.
Factory-set ranges replace separate switches
The low side covers 12 in Hg to 50 psi with a maximum differential of 35 psi. The high side covers 150 psi to 450 psi with a maximum differential of 70 psi. These combined ranges eliminate the need to stock or install two independent controls, reducing wiring time and potential leak points on the refrigerant circuit.
Direct mount simplifies installation
The control mounts directly onto the system via its pressure fittings, so no additional brackets are needed. Electrical connections use standard spade terminals compatible with 24 to 240 V circuits. The main installation error is reversing the low-side and high-side capillary tubes, which causes the control to trip at the wrong pressures.
Highlights
- Low-side control from 12 in Hg to 50 psi
- Adjustable low-side differential up to 35 psi
- High-side range spans 150 psi to 450 psi
- High-side differential adjustable to 70 psi
- Operates on 24 V or 240 V supplies
Specifications
| Brand | RANCO |
|---|
Questions about this item
How often will the switch contacts on the Ranco O12-4833 need replacement under normal HVAC cycling?
The contacts are sealed inside the control; no user-serviceable parts are listed, so replacement is only required if the unit fails to open or close at the 12–50 psi low-side or 150–450 psi high-side set-points.
What pressure limit will the high-side cut-out reach first during sustained compressor operation?
The high-side cut-out is adjustable up to 450 psi, so that is the maximum pressure the control will allow before opening the circuit.
How much heat does the control generate when powered continuously at 240 V?
The device draws only the coil current needed to operate the internal switch; no wattage or temperature-rise figure is published, so heat output is negligible in normal panel mounting.
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