Trane · Furnace troubleshooting

Adjust gas valve manifold pressure

UH1 / DH1

What is going on

Set manifold pressure with a gauge on the White-Rodgers 36G or 36J valve.

Check in this order

  1. Turn off all electrical power to the system.
  2. Attach a manifold pressure gauge with flexible tubing to the outlet pressure boss marked OUT P.
  3. Loosen the pressure tap test set screw one turn with a 3/32 in. hex wrench. Do not remove it.
  4. Turn on power and energize the valve.
  5. Remove the regulator cover screw. Turn the adjust screw clockwise to raise pressure or counterclockwise to lower it, until the gauge matches the value in the manifold pressure table.
  6. Replace and tighten the regulator cover screw.
  7. Cycle the valve several times and recheck the setting; repeat if needed.
  8. Turn off power, remove the gauge and tubing, and tighten the pressure tap screw.
  9. Leak check the outlet boss and pressure tap screw with soap solution.
  10. Turn on power and check unit operation.

Applies to: White-Rodgers 36G and 36J gas valves

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Source: Trane 18-CD29D1-11 installer's guide, p. 32. 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.