Replacing an HVAC Ignition Control

HVAC Ignition Control
Electrical Question: Do I need to replace the transformer with a 30VA?

• I am replacing an HVAC ignition control.
• The current (original) transformer in the system is 60HZ 230V Load 24V 40VA.
• The new replacement ignition control is a Honeywell S8610U3009 which is a replacement for the original Johnson Control G600AX-1 unit.
• Looking at the specifications on the new Honeywell unit, I see that it has: Control Voltage:
  Line 24 V (18-30 Vac) 50/60 Hz.
• If my existing transformer is 40VA, do I need to replace the transformer with a 30VA?
  Honeywell Ignition Control: http://www.warming-trends.com/manuals/HoneywellControlModule.pdf
  Johnson Control G600AX-1: http://cgproducts.johnsoncontrols.com/met_pdf/1201136.pdf
  Carrier HVAC (see pg.12 – Fig.10): http://dms.hvacpartners.com/docs/1009/Public/08/48HK,KL-17SI.pdf

This electrical wiring question came from Marlin, in Calabasas, California.

Dave’s Reply:
Thanks for your electrical wiring question Marlin.

HVAC Ignition Control Transformer

Replacing an HVAC Ignition Control

• Ignition Control Transformer
  • As long as the existing transformer is producing 24volts it will not need to be replaced.
  • The existing 40VA transformer will provide the same level of power needed for the replacement ignition control.

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Home Electrical Wiring and Electrical Repairs Please Note: Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects: Skill Level: Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor. Electrical Tools Required: Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter. Estimated Time: Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area. Precaution: Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring. Important: Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.

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