The Gas-Side Boundary for an Appliance Tech

Why this matters

Gas ranges, ovens and dryers are a large share of the appliance trade, and every one of them sits on the end of a fuel system the appliance tech did not install and usually is not licensed to change. Draw the line too far in and the shop turns away a connector swap or a propane conversion that is ordinary appliance work. Draw it too far out and a tech adds a tee, moves a valve or adjusts a regulator on a tank, and the shop now owns a fuel leak in a wall it had no license to open. This card draws the line once, at the outlet of the appliance shutoff valve, says what sits on each side, and names who gets the call when the job crosses it.

If you smell gas, the boundary does not matter

Before any of this: if there is a gas odor on arrival or during work, everyone leaves the building, nobody touches a light switch, an appliance control or a phone inside, the door is left open on the way out, and the call to the gas utility or propane supplier and to 911 is made from outside and well away from the house. Nobody re-enters until the utility or fire department clears it. A leak found with solution during a leak test is different: close the appliance shutoff, ventilate, and fix the joint you made, or route it per this card if the leak is upstream of the valve.

The line, drawn

HOUSE SIDE (licensed fitter, plumber, utility,
            or propane supplier)
  utility meter, or tank with its regulators
        |
  branch piping, black iron or CSST
        |
  APPLIANCE SHUTOFF VALVE (same room as appliance)
        |
=== BOUNDARY: OUTLET OF THE SHUTOFF VALVE =========
        |
APPLIANCE SIDE (appliance tech)
  LISTED FLEXIBLE CONNECTOR
  (not concealed, not through a wall,
   floor, partition or appliance housing)
        |
  APPLIANCE PRESSURE REGULATOR (NG or LP set)
        |
  MANIFOLD
    |          |               |
  TOP VALVE  TOP VALVE   OVEN SAFETY VALVE
    |          |               |
  ORIFICE    ORIFICE        ORIFICE
    |          |               |
  BURNER     BURNER         OVEN BURNER

Everything below the valve outlet belongs to the appliance and its connection. Everything above it, the valve itself included, belongs to the building's fuel system. The appliance tech operates the valve (closing it to work and opening it after) but does not move it, replace it or add to the piping that feeds it.

What the appliance tech does on this side of the line

• Connects and disconnects the appliance from the valve outlet with a new connector listed for the purpose, sized and of a length the connector's own instructions allow. The method and the leak test are in 'Gas Range Connection and Leak Check Standard'.
• Leak-tests every joint he made or disturbed with a noncorrosive leak detection solution, with the gas on and the appliance valves off, never a flame. A bubble that grows is a leak; the fix is to remake the joint, not to tighten until it stops.
• Converts the appliance between natural gas and propane with the maker's kit: orifices or orifice settings, the regulator conversion, oven burner air shutter, and simmer adjustments, per 'How to Convert a Gas Range from Natural Gas to Propane'.
• Replaces parts inside the appliance: burner valves, the oven safety valve, igniters, the appliance regulator, burners and orifices, all from the maker's parts list.
• Measures inlet and manifold pressure at the appliance's own test port with a manometer, to prove whether a flame problem is in the appliance or upstream of it.
• Checks flames and venting the appliance owns: burner flame character, ignition, and on a dryer, the exhaust duct per the dryer card.

What routes to someone else, and to whom

Licensing is layered and local. Where a state or locality licenses gas work, its rules decide where the appliance tech's scope ends, and in some jurisdictions even the connection at the valve outlet needs a licensed fitter or a permit. This card's line is the common practice where connecting an appliance is permitted to the appliance installer; it does not override a stricter local rule. The fuel gas code (IRC Chapter 24 for one- and two-family dwellings, the IFGC for other buildings, or NFPA 54 where adopted) applies only in the edition your jurisdiction has adopted, and it binds the installation, whoever does it.

Code points that put a job on one side or the other

Paraphrased in substance from the 2021 IRC fuel gas chapter; check the current edition and any local amendments before relying on a section number.

• An accessible shutoff valve in the same room as the appliance, upstream of the connector, with the exceptions the section lists (IRC Section G2420). If the valve you need to close is in the basement or behind another appliance, the installation needs a fitter before it needs you.
• Connectors are listed, limited in length, not concealed, and not run through walls, floors, partitions or the appliance housing (IRC Section G2422). A connector that would have to be longer than its listing allows, or pass through a wall, to reach a relocated range is the clearest sign the job has crossed the line.
• Supply pressure at the appliance is set by the system, not the appliance. Most ranges and dryers expect around 7 in WC (inches of water column) at the inlet on natural gas and around 11 in WC on propane, and the rating plate states the minimum and maximum inlet pressure that governs that model.

One gate, three outcomes

The same question on three calls in one week: is the fix below the valve outlet, or above it?

Call 1: replace a range, same location. A freestanding gas range is being swapped like for like. The quarter-turn shutoff is on the wall behind the range, in the same room. The old connector is uncoated brass, the kind that cracks at its flare nuts with age and that safety agencies have long warned should be replaced, not reused. Below the line. The tech closes the valve, disconnects, fits a new listed connector of the length the new range needs, uses a gas-rated thread sealant on the male pipe threads only (never on flare faces), opens the valve, leak-tests every joint with solution, then lights each burner and the oven and checks flame character, and fits the anti-tip bracket. Done on the visit.

Call 2: same customer's neighbor, remodeled kitchen. The range has moved four feet along the wall. The existing valve is now behind the new dishwasher cabinet. Reaching it would need a connector longer than the new connector's instructions allow, threaded through the cabinet. Above the line. The tech does not connect. He confirms the valve is closed and the outlet is plugged or capped with a fitting rated for gas, opens the valve just long enough to leak-test that cap with solution and closes it again, tells the customer in writing that a licensed fitter or plumber must extend the piping and set a new valve behind the range, and books the connection as a return visit once that is done.

Call 3: propane cooktop, weak flames. All burners lift low and lazy after a tank refill. The tech checks that the cooktop is set for propane (regulator converted, LP orifices fitted, per the conversion record on the unit). With the valve closed, he connects a manometer to the appliance inlet test port, opens the valve and lights two burners. The rating plate wants 11 in WC at the inlet; the manometer reads 8 in WC. The appliance is not the cause: pressure is low before it ever reaches the appliance regulator. Above the line. He closes the valve, removes the manometer, restores the port plug, opens the valve and leak-tests the plug with solution, and routes the call to the propane supplier to check the second-stage regulator and the tank. The ticket records the reading, the rating plate figure and the time.

The tech who skipped the measurement on Call 3 would have drilled orifices or swapped the appliance regulator chasing a flame problem that lives in the supplier's equipment, and left a cooktop set wrong for the day the supply pressure is corrected.

What changes the line

• Gas dryers follow the same boundary, with the added duty that a dryer's exhaust carries combustion products, so the exhaust run belongs in every gas dryer visit. See 'Dryer Exhaust Length and Fittings Card'.
• A shop that holds a gas fitter's license can cross the line, but the work above it is then fitter's work under that license and its permit rules, not appliance service, and it should be quoted and recorded as such.
• Commercial cooking equipment brings its own codes, manifolds and hood interlocks, and usually a different license class. This card is for residential appliances.

References

• IRC Chapter 24 Fuel Gas (2021 edition, as adopted), Sections G2420 (shutoff valves) and G2422 (appliance connections); IFGC and NFPA 54 where adopted instead
• Appliance manufacturer's installation instructions and rating plate, which set inlet pressure limits and the conversion procedure
• Connector manufacturer's instructions for length and routing limits
• See related: Gas Range Connection and Leak Check Standard
• See related: Gas Line + Propane Sizing Reference