4.2 Specific Equipment, Testing & Adjustment
Key Takeaways
- Each appliance gets its own accessible listed shutoff; the Board interpretation enacted 11-27-2013 and amended 4-01-2015 treats a manual shutoff behind a residential free-standing kitchen stove as accessible.
- Where the appliance does not include a trap, a sediment trap is installed downstream of the shutoff as close to the inlet as practical, except for the NFPA 54 list that includes ranges, clothes dryers, decorative fireplace appliances, gas fireplaces, illuminating appliances, and outdoor cooking appliances.
- 248 CMR 5.11 states that Massachusetts made no modifications to NFPA 54 Chapter 11 placing-in-operation procedures, so burner input, primary air, safety shutoffs, ignition, protective devices, the five-minute draft-hood check, and leaving operating instructions still apply as adopted.
- On-demand domestic water heaters are a Board-recognized alternative to 248 CMR 10.14(4) Table 4 fixture flow rates; installation still must meet applicable water-heater standards, 248 CMR 3.04 product acceptance, 10.14 pipe sizing and incoming-main pressure, and the manufacturer's instructions and sizing guides.
- Massachusetts Chapter 9 and 10 overlays that show up on equipment jobs include product acceptance, carbon monoxide detectors, a 48-inch connector limit, no CSST used as a flex connector downstream of the shutoff, boiler low-water firing protection, and the decorative-appliance damper and bedroom rules.
4.2 Specific Equipment, Testing & Adjustment
Quick Answer: Install the appliance to NFPA 54 Chapter 10 as amended by 248 CMR 5.10, then place it in operation to Chapter 11 — Massachusetts made no Chapter 11 amendments (248 CMR 5.11). Give every appliance an accessible listed shutoff that serves only that appliance. The Board’s published interpretation says a shutoff behind a residential free-standing kitchen stove is accessible. Put a sediment trap downstream of the shutoff unless the appliance is on the NFPA 54 exemption list. Do not fire above the nameplate. Check draft-hood appliances for no spillage after 5 minutes of main-burner operation. On-demand water heaters skip 248 CMR 10.14(4) Table 4 fixture flow rates, but they still need product acceptance, correct pipe sizing, incoming pressure, and the manufacturer’s instructions.
The Candidate Information Bulletin splits this into Specific Equipment and Equipment Testing and Adjustment. In the field it is one job: hang the unit so it can be replaced, pipe it so it can be shut off and trapped, light it so it matches the nameplate, and leave the owner a way to run it safely. 248 CMR 5.09 is the Massachusetts overlay on Chapter 9 (approval, instructions, CO, connectors, replacement clearance). 248 CMR 5.10 is the overlay on Chapter 10 (where the appliance may live, boiler low-water protection, ranges, logs, room heaters). 248 CMR 5.11 is a one-line gift: no modifications to Chapter 11.
Shutoff valves, connectors, and sediment traps
NFPA 54 requires each appliance connected to the piping system to have an accessible, approved manual shutoff with a non-displaceable member, or a listed gas convenience outlet. That valve or outlet serves one appliance only. Public NFPA 54 text used on exams places the valve in the same room, within 6 feet of the appliance, and upstream of the connector. The Board’s interpretation titled Accessible Gas Appliance Shut-Off Valves (enacted 11-27-2013, amended 4-01-2015, posted on Mass.gov) is narrower than folklore: it interprets NFPA 54-2012 9.6.4 for a residential free-standing kitchen stove and states that the manual shutoff installed behind that stove is accessible. Do not invent crawl-space or remote-manifold rules from that page; the Board published that stove holding, not a new distance table.
248 CMR 5.05 replacing NFPA 54 5.12 limits acceptable shutoff devices to listed gas cocks and ball valves that have clearly indicated open and closed positions and rigidly secured stops, are marked with the manufacturer’s name or trademark, and use a corrosion-resistant handle where the atmosphere is corrosive.
248 CMR 5.09 adding 9.6.1.4. A connector is not more than 48 inches, is not used above 0.5 psig (14 inch water column), and is not reused except when you disconnect and reconnect the same original appliance for servicing. 248 CMR 5.05 5.6.3.4(k) is the CSST rule students miss: CSST shall not be used as a flexible appliance connector downstream of the appliance shutoff. Rigid piping to a listed connector, or CSST ending in a termination fitting and a gas cock for a fixed appliance that meets the CSST fixed-appliance conditions, is a different installation than looping CSST from the cock to the furnace like a yellow flex.
Sediment trap (NFPA 54). If the appliance does not already include a trap, install one downstream of the appliance shutoff, as close to the appliance inlet as practical, typically a tee with a capped nipple in the bottom outlet. Illuminating appliances, gas ranges, clothes dryers, decorative appliances for vented fireplaces, gas fireplaces, and outdoor cooking appliances are not required to have that trap. Furnaces, boilers, and water heaters are not on that exemption list unless the appliance itself incorporates a trap.
Clearances, approval, CO, and instructions
248 CMR 5.09 replacing 9.1.1 requires Board product acceptance under 248 CMR 3.04 unless the Board has waived it. Unlisted appliances need a Board variance (9.1.1.3 as replaced). 248 CMR 5.09 amending 9.2.1 adds that clearance must allow total replacement of the appliance. Chapter 10 still sends you to the listing and the manufacturer for combustible clearances; Massachusetts adds that those clearances cannot block combustion air or the path to pull the unit.
248 CMR 5.09 replacing 9.1.23 (carbon monoxide). You may not install or replace a vented gas appliance unless a battery-powered or hard-wired CO detector is present on the same floor, or on the next adjacent floor when the appliance is in a crawl space, unless the appliance is in a detached, uninhabitable garage. Residential dwellings also need a detector on each habitable level. That does not waive M.G.L. c. 148, § 26F½.
248 CMR 5.09 replacing 9.1.22. Follow the manufacturer unless those instructions conflict with or are less stringent than 248 CMR. Leave the installation, operating, and maintenance instructions where they will be readily available. When the inspector requires it, provide a copy within two working days before calling for final inspection.
Water heaters (gas side), boilers, furnaces, ranges, dryers, log sets
Water heaters. Pipe the gas to Chapter 9: shutoff, connector rules, sediment trap, product-accepted equipment. 248 CMR 5.10 deletes NFPA 54 10.28.2.2, 10.28.3, 10.28.4, and 10.28.5 — do not study deleted model-code subsections as if they were still Massachusetts law. What remains is the rest of 10.28 plus plumbing-side 248 CMR 10.14 and M.G.L. c. 142, § 19 for relief valves. On-demand (tankless) domestic water heaters have a Board interpretation enacted 09-29-2010: they are an alternative method for producing domestic hot water and need not meet the minimum flow pressure and flow rates in 248 CMR 10.14(4) Table 4. That alternative meets 248 CMR 10.06(2)(u). Installation still must comply with: (1) applicable standards for domestic gas water heaters; (2) 248 CMR 3.04 product approval; (3) 248 CMR 10.14(4) as it relates to pipe sizing; (4) 248 CMR 10.14 as it relates to sufficient pressure on the incoming water main; and (5) the manufacturer’s installation instructions and sizing guides. The HTML policy page does not add unpublished CFM or Btu derates beyond those five items — do not invent them. Gas-side, a high-input tankless still takes combustion air under Section 9.3 unless it is direct-vent, still needs an appliance shutoff and trap unless the listing incorporates one, and still goes through Chapter 11 lighting and adjustment. If input exceeds 400,000 Btu/hr per combustion chamber, you leave this chapter and enter 248 CMR 7.00.
Boilers and central heating furnaces. 248 CMR 5.10 replaces 10.3.5: each steam and hot water boiler shall be equipped with a control that prevents firing in the event of insufficient water. Massachusetts deletes several other 10.3 subsections (10.3.2.7 through 10.3.2.9, 10.3.7.1 through 10.3.7.3, 10.3.8, 10.3.9). Teach the published low-water rule and the manufacturer’s remaining listing requirements; do not reconstruct deleted model-code text. Furnaces still need Section 9.3 air unless direct-vent, Chapter 9 connectors and traps, and Chapter 11 draft and input checks.
Ranges (household cooking). 248 CMR 5.10 replacing 10.12.2 prohibits: (a) using gas range ovens, broilers, or top burners for space heating; (b) gas ranges with match-lit ovens; (c) any commercial cooking range without a listed oven safety pilot; and (d) appliances that do not meet M.G.L. c. 148, § 25E. 10.12.9 (Massachusetts add) covers mechanical manual-reset gas valves for hood fire-suppression systems, close to the cooking equipment, shutting the gas to equipment under that hood, with permanent notice at the reset and at the meter or propane regulator, and actuation demonstrated to the inspector at gas-piping tests.
Dryers. Type 1 versus Type 2 makeup air is Section 10.4, taught in 4.1. They are on the sediment-trap exemption list. They are not a substitute furnace. Bathroom installation is only under the 10.1.2 exception.
Log sets and decorative appliances. 248 CMR 5.10 replacing 10.6.1: decorative appliances designed for vented fireplaces, if installed in bedrooms or bathrooms, shall be Direct Vent as defined in NFPA 54 3.3.6.3. In other rooms, the flue damper shall be removed or welded fully open. Vented gas fireplaces in bedrooms or bathrooms are also Direct Vent only (10.7.1 as replaced).
Unvented room heaters are a fire-code overlay, not a “small furnace.” 248 CMR 5.10 replacing 10.23.1–10.23.2: not in bathrooms, bedrooms, or other sleeping quarters unless M.G.L. c. 148, § 25A and 527 CMR 30.04 allow it, except direct-vent appliances. Unvented heaters follow those fire provisions in a conflict; they need a plumbing/gas permit and a permit from the head of the fire department; the gas inspector’s final inspection waits for proof of the fire permit; fuel is permanently piped; input is not more than 40,000 Btu per room or space; a listed CO detector is in the same room (or where the manufacturer specifies); and they may not be the primary heat for any room or building.
Lighting, adjusting, conversion, placing in operation (NFPA 54 Chapter 11)
Because 248 CMR 5.11 makes no Massachusetts changes, walk Chapter 11 as adopted:
| Step | What you actually do |
|---|---|
| Adjusting input | Set the burner to the manufacturer’s proper input. Firing above the nameplate is prohibited. |
| High altitude | Nameplate ratings apply through 2,000 ft. Above that, reduce input 4% per 1,000 ft above sea level, or as the AHJ permits, or as the manufacturer instructs. Typical Massachusetts building sites sit below 2,000 ft; still know the rule. |
| Primary air | Set injection (Bunsen) burners for proper flame characteristics, then secure the adjustment. |
| Safety shutoff devices | Check operation. If the device will not shut gas off on pilot outage or ignition malfunction, service or replace it. |
| Automatic ignition | Operate within the manufacturer’s parameters. |
| Protective devices | Check limit controls, fan control, temperature and pressure relief, low-water cutoff, and manual operating features. |
| Checking the draft | Draft-hood appliances: no draft-hood spillage after 5 minutes of main-burner operation. |
| Operating instructions | Leave them in a prominent position near the appliance. |
Conversion from one gas to another is not a homemade orifice-swap. Use the manufacturer’s conversion parts and instructions, confirm listing for the new gas, and involve the serving gas supplier as the job requires. After piping is tested and approved, 248 CMR 5.08 replacing 8.2.3 still makes you leak-check connected appliances immediately when gas is turned on and shut off any leaking or defective appliance until repaired.
248 CMR 5.08 also reminds you that gas is not turned on for a new or rough system until the inspector has seen the test, and that concealed piping is tested before it is covered. Final operation at working pressure uses a non-corrosive leak-detection fluid or a calibrated electronic detector. That is testing and adjustment as the inspector will grade it, not as a manufacturer’s sales sheet describes it.
Official sources
- Accessible Gas Appliance Shut-offs (Mass.gov) — stove-behind-the-range accessibility interpretation.
- On Demand Water Heaters (Mass.gov) — Table 4 exception and the five compliance items.
- 248 CMR 5.00 PDF — 5.09 connectors/CO/instructions; 5.10 specific equipment; 5.11 (no Chapter 11 changes); 5.08 leak check.
- Cornell 248 CMR 5.11.
- Policies, regulations, and statutes for plumbers and gas fitters.
The Board interpretation Accessible Gas Appliance Shut-Off Valves (enacted 11-27-2013, amended 4-01-2015) states which of the following?
Which statement matches the Board interpretation on on-demand domestic water heaters (enacted 09-29-2010)?
Under NFPA 54 as adopted, which appliance is not required to have a field-installed sediment trap?
248 CMR 5.11 makes no Massachusetts modifications to NFPA 54 Chapter 11. After lighting a draft-hood appliance, when do you verify that there is no draft-hood spillage?