Cleveland Controls DNS2-1130-00B Pressure Switch

The Cleveland Controls DNS2-1130-00B Low Side Pressure Switch is a factory-calibrated DNS2 Series air pressure switch that senses positive, negative, or differential air pressure and opens or closes its contacts at a fixed set point. The -00B suffix identifies it as the low side switch in the DNS2-1130 family. Its sibling DNS2-1130-00A is a different part, listed as a cross-reference to the Daikin-McQuay 300051594 dual-stage air pressure switch, so the two suffixes are not interchangeable. Searches for the base number DNS2-1130-00 land on one of these two suffixed parts, and the letter on the original switch label tells you which one you need.

The DNS2 is essentially two separate NS2 switches joined together in one assembly, so a single device can prove two different pressure conditions. Each side uses a dual-diaphragm sensing element with an integral snap-acting switch inside a glass-filled polycarbonate housing, which gives a narrow switching differential and a stable trip point. Set points are factory-calibrated and sealed anywhere from 0.05 to 10.0 in. wc, with a tolerance of ±0.05 in. wc, and the series is built in SPNO, SPNC and SPDT contact arrangements. The pressure ports are color-coded, with P1 (positive) black and P2 (negative) gray, and the electrical connections are 90° male quick-connect spade terminals. The series is rated for -40°F to 190°F operation, a 14 in. wc maximum pressure, and carries UL, cUL, CSA and CE approvals. This unit's own trip point is set at the factory, so always replace it with the exact DNS2-1130-00B number printed on the original.

In service, a pressure switch like this one proves airflow or draft before the control is allowed to continue its sequence. On two-stage equipment the high side and low side switches each prove their own stage, so each must be replaced with its own exact number. Typical symptoms of a bad switch are a lockout or short-cycle because the contacts will not make, or lost safety proving because they stuck closed. Before condemning it, check the sample tubing for cracks, kinks and condensate, clear any blocked pressure tap, and confirm the inducer or fan is producing the pressure it should, using a manometer. Never jumper a pressure switch to get a unit running. Move the tubing and wires over one at a time so the P1 and P2 connections do not get crossed.

Key Benefits

• Low Side Switch: The DNS2-1130-00B is the low side switch of its family, so you get the exact letter suffix instead of guessing between -00A and -00B.
• Factory-Calibrated Set Point: Each DNS2 is set and sealed at the factory within 0.05 to 10.0 in. wc, so there is nothing to adjust in the field.
• Snap-Acting, Dual-Diaphragm Design: Crisp switching with a narrow differential helps prevent chatter and nuisance lockouts near the trip point.
• Easy Swap: Color-coded P1/P2 ports and quick-connect spade terminals make it a straightforward change when you transfer the tubing and wiring.

Common Questions

• What is the difference between DNS2-1130-00A and DNS2-1130-00B? They are separate parts. DNS2-1130-00B is the low side switch, while DNS2-1130-00A is cross-referenced to Daikin-McQuay 300051594. Order the one that matches the letter suffix on your original.
• Which set point does it use? Every DNS2 is calibrated to a specific set point within the series range of 0.05 to 10.0 in. wc, so replace it with the exact DNS2 part number from the original switch label.
• Where does it connect? The P1 (black) positive port and P2 (gray) negative port take the sample tubing, and the contacts land on quick-connect terminals.

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.