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Rheem · Furnace troubleshooting

Gas supply piping arrangement at the furnace

96V96MDV

What is going on

Gas supply piping at the Rheem 96V/96MDV, per the gas piping figure. Each branch gets a manual shut-off, a union and a drip leg.

Likely causes

  • Not a fault call. Piping layout requirement. Missing parts here make service difficult and can let dirt reach the gas valve.

Check in this order

  1. Install a manual shut-off valve ahead of the furnace so gas can be stopped for service.
  2. Install a union so the furnace can be disconnected without cutting pipe.
  3. Install a drip leg (sediment trap) in the piping to catch debris before it reaches the gas valve.
  4. Keep the arrangement horizontal as shown in the figure.
  5. Leak test every joint after assembly. Gas piping work belongs to a licensed gas fitter.
  6. Purge and recheck the connection before lighting the furnace.

Applies to: Gas piping installation

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Source: 96V series installation instructions, p. 72. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.