22
Pre-Conversion Unit Check-Out
The following procedure is intended as a guide to aid in determining that the appliance is properly installed
and is in a safe condition for continuing use. It should be recognized that generalized test procedures
cannot anticipate all situations. Accordingly, in some cases, deviation from this procedure may be
necessary to determine safe operation of the equipment:
• This procedure should be performed before any attempt at modification of the appliance or the
installation.
• If it is determined there is a condition that could result in unsafe operation, the appliance should be
shut off, and the owner advised of the unsafe condition.
Follow these steps when making a safety inspection:
1. Conduct a gas leakage test of the appliance piping and control system downstream of the shut-off
valve in the supply line to the appliance.
2. Visually inspect the venting system for proper size and horizontal pitch and determine there is no
blockage or restrictions, leakage, corrosion, or other deficiencies that could cause an unsafe condition.
3. Shut off all gas to the appliance and shut off any other fuel-burning appliance within the same room.
Use the shut-off valve in the supply line to each appliance.
4. Inspect burners and crossovers for blockage and corrosion.
5. Inspect heat exchangers for cracks, openings, or excessive corrosion.
6. Insofar as is practical, close all windows and all doors between the space where the appliance is
located and other spaces of the building. Turn on any exhaust fans so that they will operate at
maximum speed. If it is believed sufficient combustion air is not available, refer to the section covering
air for combustion, venting, and ventilation of
Natural Gas and Propane Installation Code
,
CSA
B149.1,
or
National Fuel Gas Code
,
ANSI Z223.1/NFPA 54,
for guidance.
7. Place the appliance in operation following the lighting instructions. Adjust thermostat so the appliance
will operate continuously. Other fuel-burning appliances shall be placed in operation.
8. Determine that the pilot is properly burning and that the main burner ignition is satisfactory by
interrupting and re-establishing the electrical supply to the appliance in any convenient manner.
• Visually determine that main burner gas is burning properly, i.e. no floating, lifting, or flashback.
Adjust the primary air shutter(s) as required.
• If the appliance is equipped with high- and low-flame control or flame modulation, check the main
burner for proper operation at low flame.
9. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use a draft
gauge, the flame of a match, or candle.
10. Return doors, windows, exhaust fans, and all other fuel-burning appliances to their previous conditions
of use.
11. Check both limit control and fan control for proper operation. Limit control operation can be checked by
temporarily disconnecting the electrical supply to the supply motor and determining that the limit
control acts to shut off the main burner gas.
