Finding the right blower time delay relay can help improve HVAC efficiency and comfort by extending the fan operation after the compressor stops. This article highlights five reliable choices aimed at homeowners and technically inclined buyers who want better air distribution, reduced short-cycling, and smoother temperature transitions. Each option is evaluated for compatibility, delaying performance, and practical limitations to guide selection.
| Product | Brand | Why It Stands Out | Best For |
|---|---|---|---|
| Emerson 57T01-843 Blower Time Delay Relay | White-Rodgers | Precise 2-second start delay and 80-second shutdown delay; broad compatibility with White-Rodgers/Trane boards | Homeowners upgrading White-Rodgers or Trane-relay compatible systems |
| 57T01-843 Blower Time Delay Relay (GUZIKO) | GUZIKO | Two-second start, eighty-second shutdown; designed to stabilize airflow and reduce abrupt temperature changes | Systems needing smoother air flow on start and stop |
| 91-9301 ClimaTek Upgraded Blower Time Delay Relay | ClimaTek | Direct replacement for common Trane boards; built to last | Trane-based installations requiring reliable replacements |
| 4352H ClimaTek Upgraded Blower Time Delay Relay | ClimaTek | Direct replacement for 4352H; high-quality replacement part | Older Trane configurations needing a compatible upgrade |
| C800924P01 ClimaTek Upgraded Blower Time Delay Relay | ClimaTek | Direct replacement for C800924P01; robust design | Trane-related boards needing a sturdy time delay relay |
Emerson 57T01-843 Blower Time Delay Relay
Brand: White-Rodgers. Features include use with air handlers in compressor-run AC and heat pump systems, delaying blower shut-off after the compressor stops, and increasing cooling efficiency by circulating residual cooled air. Best for: buyers installing or upgrading White-Rodgers or Trane-compatible relays seeking a proven timing sequence. Limitation: ensure model compatibility with your specific control board before purchasing.
57T01-843 Blower Time Delay Relay, Replacement for White Rodgers Trane
Brand: BIPIMIFI. Features emphasize enhanced cooling efficiency by keeping residual air circulating post-compressor shutdown, compatibility with multiple White-Rodgers and Trane relay boards, and precise timing with startup delay of about 2 seconds and shutdown delay around 80 seconds. Best for: users who need a compatible, adaptable replacement across several blower delay boards. Caution: verify the exact part number before ordering to avoid compatibility issues.
91-9301 ClimaTek Upgraded Blower Time Delay Relay
Brand: ClimaTek. Features include a direct replacement for Part # 91-9301 and top-quality build designed to last. Best for: Trane-related applications requiring a reliable, ready-to-install relay. Limitation: ensure it aligns with your model’s control board and connections to avoid misfit.
4352H ClimaTek Upgraded Blower Time Delay Relay
Brand: ClimaTek. This is a brand-new upgraded replacement that directly fits the 4352H model and is built to last. Best for: users upgrading a Trane unit that uses the 4352H circuit. Caution: confirm the exact replacement number to avoid incorrect sizing or mounting issues.
Upgraded Furnace Fan Circuit Boards for Goodman PCBFM103S
Brand: WERLAHO. Features describe saving on service calls by replacing with PCBFM103S and related replacements; designed for Goodman/Daikin/Amana systems. Best for: homeowners seeking a complete control board-style solution, not just a single relay. Caution: verify part compatibility with your entire HVAC control system before ordering.
US Business HK61EA006 OEM Replacement
Brand: Fast Craft. Notes a warning about compatibility and the importance of verifying part numbers to avoid mismatches. Best for: Carrier/Bryant/Payne systems needing authentic OEM-style replacement. Limitation: incorrect parts or underlying unit issues can render the new relay ineffective; double-check part numbers before ordering.
57T01-843 Blower Delay Device (GUZIKO)
Brand: GUZIKO. Features include a 2-second start delay and 80-second shutdown delay, aiming to prevent abrupt air bursts and stabilize temperatures. Best for: users seeking a combined timing profile that aligns with standard 2s/80s delays. Caution: verify model compatibility and avoid over-reliance on a single source for critical HVAC replacements.
C800924P01 ClimaTek Upgraded Blower Time Delay Relay
Brand: ClimaTek. Best for: Trane systems requiring replacement of Part # C800924P01 with a robust, upgraded relay. Limitation: ensure exact compatibility with your control board and connectors to avoid fit issues.
Buying Guide
What should you consider when choosing a blower time delay relay?
- Compatibility: Check your HVAC control board model numbers and confirm replacement part numbers before ordering to avoid misfits.
- Timing profile: Decide between a short startup delay and longer shutdown delay; most effective systems use a 2-second start delay and an 80-second shutdown delay to minimize abrupt air changes.
- Durability: Look for relays built to withstand frequent start-stop cycles in residential HVAC environments.
- Ease of installation: Direct replacements reduce wiring changes and wiring harness compatibility concerns.
- Brand ecosystem: When upgrading, staying within a single brand family (e.g., White-Rodgers/Trane) can simplify compatibility and future replacements.
- Warranty and support: Consider product support quality and return policies when purchasing aftermarket replacements.
Frequently Asked Questions
- What is a blower time delay relay used for?
It controls how long the blower runs after the compressor stops, helping maintain even temperatures and improve cooling/heating efficiency.
- How long should the delay be?
Common configurations use a 2-second startup delay and an 80-second shutdown delay to smooth airflow and temperature changes.
- Can I replace a blower time delay relay myself?
Yes, many replacements are designed as direct substitutes, but verify part numbers and wiring before installation.
- What if the replacement part is not compatible?
Check model numbers on the control board and consult the manufacturer’s guidelines or a technician for alternatives.
- Are OEM parts better than aftermarket options?
OEM parts offer guaranteed compatibility, while aftermarket options can provide cost benefits but require careful compatibility checks.
- Do these relays affect energy usage?
Indirectly; improved airflow control can prevent unnecessary cooling cycles and reduce runtime inefficiencies.
