Description
The AAON P45120 is a factory-specified delay-on-break (DOB) timer relay engineered for dependable timing control in commercial and residential HVAC systems. Designed to operate on 18–30VAC, this OEM-grade component delivers a fixed 5-minute time delay after the control signal is removed, allowing equipment such as blower motors and fans to continue running for a set period before shutting down — a critical function for heat dissipation, coil protection, and system efficiency.
Key Features
- Delay-on-break (DOB) timing function for controlled equipment shutdown sequences
- Operating voltage range: 18–30VAC for broad compatibility with standard HVAC control circuits
- Fixed 5-minute time delay — no adjustment required, ensuring consistent and repeatable operation
- 4-terminal design for straightforward wiring integration into existing control panels
- OEM AAON replacement part — engineered to match original equipment specifications
- Compact form factor suitable for installation in tight control enclosures
How Delay-On-Break Timers Work
A delay-on-break relay keeps the output energized for a fixed period after the input signal is lost. In HVAC applications, this means a blower or fan motor continues to run after the thermostat call ends, allowing residual heat or cold to be distributed and protecting heat exchangers from thermal stress. The AAON P45120’s 5-minute fixed delay is factory-set for optimal performance within AAON equipment.
Applications
- AAON rooftop units and air handlers requiring OEM timing control
- Blower motor delay-off sequencing
- Fan coil and air handling unit shutdown timing
- Commercial HVAC control panel integration
Specifications
- SKU: P45120
- Brand: AAON
- Timer Type: Delay-On-Break (DOB)
- Input Voltage: 18–30VAC
- Time Delay: 5 minutes (fixed)
- Number of Terminals: 4
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