W415-2845 / B / 11.10.20
36
IOM
IOM
12.3 GAS INLET PRESSURE
12.4 LEAK TESTING
12.5 PURGING GAS LINES
H17.2B
IMPORTANT:
ALWAYS USE A BACKUP
WRENCH TO PREVENT TWISTING
OF THE GAS VALVE. ANY
STRAINS ON THE GAS VALVE
CAN AFFECT POSITIONING OF
THE ORIFICES RELATIVE TO THE
BURNERS. THIS COULD RESULT
IN FAULTY BURNER OPERATION.
Install a manual gas shut-off valve and dirt pocket as close to the furnace as possible. Some local codes call
for the manual gas shut-off valve to be located between 4 feet (1.2m) to 5 feet (1.5m) above fl oor level to
prevent tampering by small children. Ensure that the valve is readily accessible.
IMPORTANT:
ENSURE
THAT THE
GAS VALVE
IS NOT
SUBJECTED
TO HIGH
PRESSURES.
H3.19
DISCONNECT THE MANUAL SHUT-OFF VALVE AND GAS VALVE DURING ANY
PRESSURE TESTING THAT EXCEEDS 1/2 P.S.I.G. (3.45 KPA).
WARNING
!
!
H17.3.6A
The natural gas inlet supply pressure should be 5” to 10.5” w.c. (7” w.c. recommended). The LP gas inlet supply
pressure should be 11” to 13” w.c. (12” w.c. recommended). These pressures must be maintained while all other
gas fi red appliances are operating at maximum conditions.
IMPORTANT:
DO NOT EXCEED 13” W.C. INLET PRESSURE WITH EITHER FUEL.
The gas valve has two adjustable internal regulators for controlling burner manifold pressure. Burner manifold
high fi re and low fi re pressures are listed on the furnace rating plate.
H17.4
All new gas piping installations should be pressure tested as specifi ed by CAN/CSA-B149.1 & 2, or NFPA 54
ANSI Z223.1 or ANSI/NFPA 58, “Standard for the Storage and Handling of Liquefi ed Petroleum Gases.”
Gas piping that has not been pressure tested, from the manual shut-off valve to the furnace gas valve for
example, should be leak tested using an electronic combustible gas detector, a commercially prepared leak
detector, or other locally approved method.
H3.20
NEVER USE A MATCH, TAPER, CIGARETTE LIGHTER, FLAME OR ANY OTHER IGNITION
SOURCE TO CHECK FOR LEAKS IN A GAS LINE.
FAILURE TO ADHERE TO THIS WARNING CAN CAUSE A FIRE OR EXPLOSION
RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE.
WARNING
!
!
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