Reznor 259521 Relay Kit/Sequencer

The Reznor 259521 Relay Kit/Sequencer is a critical OEM replacement part designed to maintain precise control over blower and venting sequences in gas-fired unit heaters. This professional-grade time delay relay replaces obsolete components, including P/N 46233 (Texas Instruments #60000GO-17) and P/N 259518 (ICM #CTVR-AT1207). It is engineered for industrial furnace repair and commercial HVAC applications, facilitating the correct sequencing of electrical components to protect the blower motor and venter assembly from premature wear. The kit features a Thermodisc #12S22 305587 (P/N 259780) to ensure high-accuracy timing during heater cycling. Built to handle heavy-duty sequencer relay tasks, this kit ensures HVAC system compatibility across a wide range of Reznor model series, including SC, RPV, and gravity-vented models equipped with power venters. Utilizing this Reznor unit heater part ensures your equipment operates within original manufacturer specifications, stabilizing the thermal startup and shutdown phases for maximum performance.

Key Benefits

• Universal Compatibility: Fits an extensive range of MBH B/F fan and blower models, including SC, SSCBL, RPV, and RP series.
• Direct OEM Replacement: Replaces obsolete part numbers 46233 and 259518 for seamless box-to-box installation.
• Enhanced Component Protection: Precise time delay prevents blower and vent motor overloads by ensuring the proper operational sequence.
• Simplified Field Service: Includes updated technical literature and the 259780 replacement relay for immediate field integration.
• Reliable Industrial Build: Designed for demanding environments, ensuring stable switching and consistent timing accuracy.

Common Questions

What obsolete Reznor relays does the 259521 kit replace?
This kit is the official replacement for P/N 46233 and P/N 259518. It effectively supersedes the older Texas Instruments and ICM models used in previous heater generations.

Which Reznor heater models are compatible with this sequencer?
It is compatible with Reznor Model Series SC(A)(B)(E), SSCBL, RPV, RP(B)(BL), HRPD, PGBL, PCCA, and AHCA. It also works for gravity-vented Models F and B when a power venter is installed.

Is the wiring for the 259521 relay the same as the old unit?
For most power-vented units, the wiring remains identical to the relay being replaced. However, for Models F and B with power venters, technicians must consult the specific wiring diagram included in the kit to ensure proper terminal connection.

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.