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Carrier, Bryant, Day night, Payne gas furnace design and troubleshoot
When troubleshooting, understand you are working with potentially lethal voltages and a highly flammable gas. If you do not have the ability to do these operations safely, do not attempt them.
Carrier manufacturers, in addition to Carrier, Bryant, Day Night and Payne.
There are some variations in model #s. Usually Carrier will have its own model#. Bryant, Day Night and Payne are simply the same furnace with different names. All these furnaces have close similarities.
There are some variations in model #s. Usually Carrier will have its own model#. Bryant, Day Night and Payne are simply the same furnace with different names. All these furnaces have close similarities.
Carrier 394GAW model gas furnace
The following information covers a number of Carrier, Day night and Payne models installed approximately between 1980 and 1990.
These units all had pilot assemblies that looked similar to the one on the left.
These units all had pilot assemblies that looked similar to the one on the left.
The furnace below was installed in the early to middle 1980s. The models listed below are only a partial list.
The electric pilot assembly used on Carrier, Bryant Day and Night furnaces.
These pilots assemblies were an early form of an intermittent pilot.
When the furnace was off, the pilot burner was off. On a call for heat, a spark ignitor would begin sparking near the pilot burner. At the same time, pilot gas would flow. When the pilot lit, a single pole, double throw temperature actuated switch would change position. The change in position allows main gas to flow to the burners.
The following videos cover the operation and troubleshoot of this pilot assembly.
When the furnace was off, the pilot burner was off. On a call for heat, a spark ignitor would begin sparking near the pilot burner. At the same time, pilot gas would flow. When the pilot lit, a single pole, double throw temperature actuated switch would change position. The change in position allows main gas to flow to the burners.
The following videos cover the operation and troubleshoot of this pilot assembly.
The video below describes a common problem with the intermittent pilot assembly where the pilot lights, then the main burner lights but main burner shuts off within 1 to 3 seconds. At this point, the pilot assembly is failing and needs to be replaced.
The video below covers troubleshoot of these models of furnace that is unique to these models. These furnaces were earlier models that did not have inducers.
Later models of this furnace included inducers. Below are some videos showing operation and troubleshoot of these models.
Carrier
58SX* 58DXC 58MXB 58MVP
58SXA 58MSA 58UVB 58MVB
58SXC 58MCA 58SXB* 58MTA
58DX* 58MXA 58VUA 58MTB
58DXA 58MCB 58VCA 58MVC
Bryant/Payne/Day & Night
398AAW* 398AAV 398BAZ 490AAV
398AAZ 350MAV 320AAZ PG9MAA
399AAW* 340AAV 321AAZ PG9MAB
399AAZ 350AAV 355MAV 355CAV
399AAV 351DAS 355AAV 340MAV
345MAV 355BAV 352MAV 398BAW*
352AAV*
All the above models have been recalled for a secondary heat exchanger rust out problem.
58SX* 58DXC 58MXB 58MVP
58SXA 58MSA 58UVB 58MVB
58SXC 58MCA 58SXB* 58MTA
58DX* 58MXA 58VUA 58MTB
58DXA 58MCB 58VCA 58MVC
Bryant/Payne/Day & Night
398AAW* 398AAV 398BAZ 490AAV
398AAZ 350MAV 320AAZ PG9MAA
399AAW* 340AAV 321AAZ PG9MAB
399AAZ 350AAV 355MAV 355CAV
399AAV 351DAS 355AAV 340MAV
345MAV 355BAV 352MAV 398BAW*
352AAV*
All the above models have been recalled for a secondary heat exchanger rust out problem.
Bryant 355 MAV
This furnace is one of the above recalled units.
The following video is an overview of this furnace.
This furnace is one of the above recalled units.
The following video is an overview of this furnace.
The following video covers 1st stage sequence of operation.
The following video covers 2d stage sequence of operation.
The video below explains how the variable speed inducer works. This one is on the 355 MAV model but the video can be used universally.
The Carrier 398AAV gas furnace. The following video begins the series on this furnace with an overview.
This one continues with a test of the flame rod on this furnace.
The following video gives a number of troubleshooting tips for this furnace.