Tjernlund PAI-1 & 2O Combustion Air In-Forcer 8504038 Rev A 05/01 - Manual (Page 4)

B. If it is determined there is a condition which could result in unsafe operation, the appliance should be shut off and the owner
advised of the unsafe condition.
The following steps should be followed in making the safety inspection:
1. Conduct a gas leakage test of the appliance piping and control system downstream of the shutoff valve in the supply line to the
appliance.
2. Visually inspect the venting system and determine there is no blockage or restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
3. Shut off all gas to the appliance(s).
4. Inspect burners and crossovers for blockage and corrosion.
5. Applicable only to furnaces: Inspect heat exchanger for cracks, openings or excessive corrosion. Check both the limit control
and fan control for proper operation.
6. Applicable only to boilers: Inspect for evidence of water or combustion product leaks. Determine that the water pumps are in
operating condition. Test low water cutoffs, automatic feed controls, pressure and temperature limit controls and relief valves in
accordance with the manufacturer's recommendations to determine that they are in operating order.
* Excerpts from the National Fuel Gas Code (ANSI Z223.1/NFPA #54), Appendix H.
IN-FORCER TERMINOLOGY
INTAKE ELBOW TERMINATION CLEARANCES
The IN-FORCER has been Listed in accordance with the 1990 BOCA national Mechanical Codes M-306.1 and M-306.1.1 as follows,
(See Diagram A).
M-306.1 LOCATION: Outside air exhaust and intake openings shall be located a minimum of 10 feet (3048mm) from lot lines or build-
ings on the same lot. When openings front on a street or public way, the distance shall be measured to the centerline of the street or
public way.
M-306.1.1 INTAKE OPENINGS: Outside air intake openings shall be located a minimum of 10 feet (3048mm) from any hazard or
noxious contaminant such as vents, chimneys, plumbing vents, streets, alleys, parking lots and loading docks. When a source conta-
minant is located within 10 feet (3048mm) of an intake opening, such opening shall be located a minimum of 2 feet (610mm) below
the contaminant source.
IN ADDITION TO THESE CODES THE MANUFACTURER RECOMMENDS THAT:
• The intake elbow should be a minimum of 1 foot above grade or anticipated snow line.
3
* IF TERMINATING BELOW GRADE
OR ANTICIPATED SNOW LINE, USE
EXTENSION PROCEDURE AS
SHOWN IN TABLE 2 OR TABLE 3.
If possible, terminate the IN-FORCER on a wall that does not face the direction of prevailing
winds. This will diminish the possibility of wind induced damper fluctuation noise.
DIAGRAM A