The Listing and Instructions Check SOP

Purpose

This check guarantees that every product a crew installs carries a mark that covers what it is being used for, is installed in a combination its listing actually tested, and is set against the revision of the instruction sheet that shipped in the box. Most model codes, as adopted, require listed equipment to be installed per its listing and instructions (NEC 110.3(B) is the plainest version), which makes the sheet part of the code the inspector enforces. Without this check the shop finds out at final inspection, after the drywall is closed, the line set is brazed, or the vent is through the wall. See related: The Installation Instructions Are Part of the Code.

Scope

Covers: any listed appliance, equipment or assembly installed on a permitted or unpermitted job: furnaces, water heaters, condensers and coils, panels and breakers, fixtures, fans, vent systems, fire-rated penetration products, structural connectors.

Does not cover: like-for-like consumable parts swapped during a repair visit (filters, igniters bought against the model's parts list), which the service-call parts check owns; products with no listing at all, which go to the field evaluation path (see related: Field Evaluation When a Product Has No Listing); and products approved through an evaluation report rather than a listing, which follow How to Read an Evaluation Report Before You Use a Product.

Roles and responsibilities

The handoff that fails most is purchasing to lead tech: the substitute model that arrived because the quoted one was back-ordered. That is why step 2 exists.

The procedure

1. Name the combination at the quote. The estimator records every model number that has to work together as a tested set: outdoor unit, indoor coil and furnace or air handler; appliance and vent system; panel and breakers; fixture and its trim or driver. Acceptance: each model number is written in full, including suffixes, and for a split system the matched-system certificate number is attached. What wrong looks like: "3 ton heat pump, existing coil." Stop rule: an incomplete combination does not get quoted as a firm price; the estimator flags it and the owner decides whether to quote the replacement of the missing piece or quote conditionally. No site hazard at this step, but a quote that leaves a coil in place commits the shop to a combination nobody checked. See related: Combination Listings and the Mix-and-Match Trap.

2. Match what arrived to what was quoted. On receipt, the office compares the carton labels to the quote line by line, suffix included. Acceptance: every model number matches, or the substitution is written on the job with the reason and re-runs step 1 for the new part. What wrong looks like: a distributor substitute with a different suffix, which often means a different refrigerant, voltage or vent category. Stop rule: any substitution goes to the estimator before it leaves the shop, never to the tech on site. Handling hazard: cartons over about 50 pounds are a two-person lift or a dolly, and a condenser stays upright so its compressor oil does not migrate.

3. Read the mark, not the sticker. On site, before installation, the lead tech locates the listing mark on the product itself (data plate or rating label, not the carton) and confirms three things: the mark belongs to a testing laboratory on OSHA's NRTL list or one the jurisdiction accepts, it is a listing mark and not a component recognition mark, and its scope covers the use (damp or wet location, outdoor, sealed combustion, the intended voltage). Acceptance: lab named, mark type confirmed, location rating matches the install location as photographed. What wrong looks like: a recognized-component mark on a finished product, a mark the tech cannot place, or a dry-location fixture headed for a covered porch. Stop rule: unfamiliar or wrong-scope mark means do not install; call the office for the directory check. See related: Recognized Components Versus Listed Products.

4. Pull the sheet that shipped in the box and record its revision. The installation instructions are found in the carton, photographed cover and revision block, and checked against the last revision the shop installed from for that model family. Acceptance: revision code or date recorded; any change from the last one the shop used is flagged. What wrong looks like: installing from memory, or from a PDF downloaded a year ago. Stop rule: if the sheet is missing, the tech gets the current one from the manufacturer's literature page by model number before proceeding; if a changed revision alters a clearance, vent length or accessory, the lead tech reads the change section before anything is cut. See related: How to Handle an Instruction Sheet That Changed Since Your Last Install.

5. Check every clearance against the sheet, then against the code, and use the larger. The lead tech measures the actual planned location: clearance to combustibles, service clearance, vent termination distances to openings, corners, grade and the gas regulator, condenser distance to walls and other units. Acceptance: each measured value written next to the sheet's minimum, all meeting or exceeding it. What wrong looks like: a location that meets the code table but not the sheet, or the reverse. Stop rule: any shortfall stops the install at this location; the lead tech calls the service manager with the two numbers and a photo, and nobody drills the termination hole until a new location is approved. Hazard: measuring a vent route on an exterior wall from a ladder means ladder footed and tied off or a second person holding it, and three points of contact while the tape is out. See related: When the Instructions and the Code Disagree.

6. Confirm the accessories the sheet makes mandatory. Many sheets require parts that are not in the box: a specific vent termination kit, a condensate neutralizer, a seismic strap, a listed breaker type, a pad of a minimum height, a high-altitude or propane conversion kit. Acceptance: each required accessory is on site, its part number matches the sheet, and it is checked off. What wrong looks like: a generic termination where the sheet names the kit, or a natural gas appliance headed for a propane house with no conversion. Stop rule: missing required accessory means the install waits; the tech does not substitute from the truck. Hazard: a gas conversion is done only by a qualified tech with the gas supply shut and the appliance unpowered, and the conversion label filled in and affixed.

7. Commission against the sheet's own targets and photograph the evidence. After installation, the tech records the values the sheet asks for: manifold pressure and temperature rise for a furnace, superheat or subcooling target for a split system, breaker type and torque for a panel. Acceptance: each reading within the sheet's stated range, photographed with the instrument visible. What wrong looks like: a commissioning reading outside the sheet's range accepted because "it runs." Stop rule: out-of-range reading is corrected before the customer is told the job is done, or the system is left off and the service manager called. Resume hazard: before the first fire of a gas appliance, the tech has leak-tested every new joint with a listed leak detection solution or electronic detector and the vent is fully connected; before energizing, the tech has verified the breaker size against the data plate and that all covers are on.

8. Leave the sheet where the inspector and the next tech will find it. Acceptance: the instructions are left at the appliance in a sleeve, or as the jurisdiction expects, and a copy is in the job file. Stop rule: none, but a missing sheet at final inspection is a common reason for a re-inspection fee. See related: How to Keep Installation Instructions for the Inspector.

Exception path. If the customer refuses a step's correction (keeping a coil the check flagged, refusing a required kit), the tech stops, the service manager explains in writing that the shop cannot install the combination as proposed, and the job either changes scope or does not proceed. The shop does not install a non-conforming combination under a signed waiver: the waiver does not change what the inspector enforces, and whether it shifts liability is a question for the shop's own attorney.

The record this produces

One check record per installed product family, attached to the job in the job-management system:

LISTING + INSTRUCTIONS CHECK      Job 4471
-----------------------------------------------
Item       Model (full)       Mark   Type  Scope
Furnace    [model + suffix]   NRTL   List  Indoor
Vent kit   [kit no.]          NRTL   List  Per sht
Sheet rev  [rev code]  Last used: [prior rev]
Changed?   Y - termination clearances revised
Clear.     Sheet min  Measured  Code min  Pass
 Inside corner  sht    see note    n/a    HOLD
Accessories: term kit Y  neutralizer Y
Commission: rise in range Y  manifold Y
Tech: [initials]   Reviewed: [initials]

The office reads it before scheduling final inspection. The service manager reads every record with a HOLD. A year later, it answers the question every warranty denial and every callback asks first: which sheet did you install from.

A worked pass

A crew is replacing a 25-year-old atmospheric furnace with a 95 percent condensing furnace in a two-story house, on a permit.

• Step 1: furnace, vent termination kit and the existing coil were all listed by model on the quote, with the matched-system certificate for the retained condenser and coil with the new furnace attached. Pass.
• Step 2: the received furnace's suffix matched. Pass.
• Step 3: the data plate carried a listing mark from a lab on the NRTL list, rated for indoor installation, sealed combustion. Pass.
• Step 4: the sheet's revision code differed from the one the shop last used for this family. The change page showed a revised termination clearance diagram. Flagged.
• Step 5: FAILED. The planned two-pipe termination sat 14 inches from an inside corner of the house. The code table the shop knew had no inside-corner figure; the new sheet set a larger minimum. The lead tech stopped, photographed the corner with a tape in frame, and called the service manager. Ladder footed by the second tech while measuring.
• Stop rule taken: the termination moved to a straight run of wall 6 feet along, which added 4 feet of pipe and two elbows. The tech re-checked the sheet's maximum equivalent vent length against the new run before cutting: the run stayed inside the limit with margin of about a third.
• Step 6: termination kit and neutralizer on site. Pass.
• Step 7: temperature rise within the plate's range, manifold pressure within the sheet's range, leak test clean before first fire. Pass.
• Step 8: sheet left in a sleeve on the furnace. Pass.

The relocation cost about an hour and a half of labor. Discovering it at final inspection would have meant patching siding, cutting a second hole, and a re-inspection. The failing step stopped before any hole was drilled, which is the only reason the move was cheap.

References

• NFPA 70, National Electrical Code, Section 110.3(B), in the edition your jurisdiction has adopted: listed or labeled equipment installed and used per its listing or labeling instructions.
• International Residential Code, mechanical and fuel gas chapters, as adopted by your jurisdiction: appliances installed per the manufacturer's instructions and their listing.
• OSHA, Nationally Recognized Testing Laboratory Program: the current list of recognized laboratories.
• See related: Listed, Labeled and Approved: Three Words That Are Not the Same; What an Equipment Listing Actually Covers.