Value Brand
Value Brand 780-790 HVAC control
An ignition control unit for natural gas systems, operating from -40 to 176 degrees F with a 17 second pre-purge and 1.5 A valve output at 120V AC
- ColorTransparent
- Operates down to -40 °F for cold-climate reliability
- Handles up to 176 °F maximum temperature for durability
- 17-second pre-purge ensures safe ignition sequencing
- Delivers 1.5 A main valve current for strong valve actuation
- Runs on standard 120 V AC supply voltage
HVAC Ignition Control 780-790
The Robertshaw 780-790 is a new ignition control unit designed for natural gas HVAC systems. It operates on a 120V AC input and delivers a 1.5 A main valve current output. This component manages the ignition sequence for compatible heating equipment.
Suitable for standard gas furnace repairs
This unit suits technicians replacing a failed ignition control on natural gas appliances requiring a 17-second pre-purge cycle. It is not for installers working on LP gas systems or equipment demanding a different pre-purge duration or voltage input.
Temperature range -40 to 176 Degrees F
The decisive specification is the wide operating temperature window spanning -40 Degrees F to 176 Degrees F. This range determines whether the control survives the specific ambient conditions inside the target appliance cabinet.
Highlights
- Operates down to -40 °F for cold-climate reliability
- Handles up to 176 °F maximum temperature for durability
- 17-second pre-purge ensures safe ignition sequencing
- Delivers 1.5 A main valve current for strong valve actuation
- Runs on standard 120 V AC supply voltage
Specifications
| Brand | ROBERTSHAW |
|---|---|
| Color | Transparent |
Questions about this item
What clearance does the 780-790 ignition control need for its 176 °F maximum operating temperature?
Mount the unit where ambient temperature stays at or below 176 °F and above -40 °F; allow enough air space around the housing so heat from nearby components does not push the control past its rated limit.
Which wiring step on the 780-790 is most often missed during installation?
Connect the 120 V AC supply to the designated input terminals and verify the main valve circuit draws no more than 1.5 A; the 17-second pre-purge will not start until both power and valve wiring are complete.
How can I tell when the 780-790 ignition control needs replacement?
If the unit fails to initiate the 17-second pre-purge, does not energise the main valve at 1.5 A, or operates outside the -40 °F to 176 °F range, the control has likely reached end of life.
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