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Robertshaw 780-845 ignition module, rectangular black plastic housing with terminal connectors

Robertshaw

Robertshaw 780-845 Ignition Module Intermittent Pilot 24 V HVAC Control

SKU CH-ZGFS-9WA49 MPN 780-845

Intermittent-pilot ignition module for 24 V gas systems, operating from -40 °F to 175 °F with 90-second lockout and three retries

  • TypeGas Ignition & Pilots
  • Reliable ignition with intermittent pilot design
  • Operates from -40 to 175 Degrees F
  • Three retries before 90-second lockout
  • Automatic reset after one hour
  • 24 V control with 1 A main valve output

Intermittent Pilot Ignition Module

The Robertshaw 780-845 is an intermittent pilot ignition module designed for gas-fired HVAC equipment. It operates on a 24 V supply and manages the ignition sequence for heating systems. The control provides automatic reset after a one-hour lockout period.

Suitable for gas furnace and boiler repairs

This module suits technicians replacing a failed intermittent pilot control on compatible equipment. It is not for installers needing a direct spark or hot surface ignition system. Buyers requiring a different lockout timing or valve current rating should verify specifications before purchasing.

90-second ignition cycle with three retries

The control attempts ignition for 90 seconds per cycle and allows up to three retries before lockout. A six-minute pre-purge precedes each trial. This timing sequence determines compatibility with the appliance safety requirements.

Highlights

  • Reliable ignition with intermittent pilot design
  • Operates from -40 to 175 Degrees F
  • Three retries before 90-second lockout
  • Automatic reset after one hour
  • 24 V control with 1 A main valve output

Specifications

TypeGas Ignition & Pilots
BrandROBERTSHAW
Model780-845

Questions about this item

What comes with the Robertshaw 780-845 module and is a separate flame sensor required?

The module is supplied as a single ignition control unit; a compatible flame sensor must be purchased separately to complete the intermittent pilot system.

How do I decide between the 90-second lock-out and the 6-minute pre-purge timing for my furnace?

The 90-second lock-out is the safety shut-off after failed ignition attempts, while the 6-minute pre-purge runs before each trial; both are fixed timings on this model, not selectable options.

What does the 0.7 mA flame sensor current mean when the module is installed in a live HVAC system?

It is the minimum current the module must detect from the flame rod to confirm burner ignition; if the measured current falls below 0.7 mA the control will lock out after three retries.

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