Description
Product Overview
Ensure proper HVAC system shutdown with the iFJF 57T01-843 Blower Time Delay Relay (24V). This critical component controls the post-purge fan delay cycle in heating, ventilation, and air conditioning systems, allowing the blower to continue running after the heating element or burner shuts off — extracting residual heat and preventing hot spots that can damage equipment.
This 24V time delay relay is a common failure point in HVAC systems. When it fails, the blower either stops immediately (wasting heat) or runs continuously (wasting electricity). Our direct replacement matches the exact timing curve and electrical specifications of the OEM unit at a fraction of the cost.
Key Features
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Precise Timing: Factory-calibrated delay matches OEM specifications for correct post-purge duration
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24V Operation: Standard 24V AC/DC control voltage — compatible with most residential and light commercial HVAC systems
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Industrial Grade: Built with high-quality relays rated for 100,000+ cycles
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Wide Cross-Reference: Replaces 57T01-843, 91-9301, C800924P01, RLY02807, X13260259010, RLY02257
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Easy Installation: Standard mounting footprint and spade terminal connections — drop-in replacement
📋 Compatibility
| Compatible Systems |
|---|
| Residential Furnace Post-Purge Control |
| Commercial Rooftop HVAC Units |
| Heat Pump Blower Delay Control |
| Industrial Process Heating Ventilation |
| Any system using 57T01-843 or equivalent time delay relay |
📐 Specifications
| Specification |
Value |
| Part Number |
57T01-843 |
| Cross References |
91-9301, C800924P01, RLY02807, RLY02257, X13260259010 |
| Coil Voltage |
24V AC/DC |
| Contact Rating |
Typically 10A @ 240V AC |
| Delay Type |
Delay-off (post-purge) |
| Mounting |
Standard panel mount with spade terminals |
❓ Frequently Asked Questions
Q: What does a blower time delay relay do?
A: It keeps the blower fan running for a set period (typically 60-120 seconds) after the heating element or burner shuts off. This extracts residual heat, improves efficiency, and prevents equipment damage from hot spots.
Q: How do I know if my time delay relay is bad?
A: If the blower stops immediately when the heat cycle ends (no delay), or the blower runs continuously without shutting off, the time delay relay is likely faulty.
Q: Is this 24V or 120V?
A: This is a 24V control relay — the most common voltage for HVAC control circuits. Always verify your system's control voltage before ordering.
Q: Can I install this myself?
A: If you're comfortable working with HVAC electrical components and always disconnect power first, yes. However, we recommend a licensed HVAC technician for safety.
Q: What is the delay time on this relay?
A: The delay is factory-set to match the OEM 57T01-843 specifications, typically 60-120 seconds off-delay for post-purge applications.
