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5. Install a manual gas shutoff valve for service and
safety. Do not use a restrictive gas cock. DO
NOT USE FLEXIBLE GAS PIPING, it will
restrict the gas flow to the heater.
6. Disconnect the heater and its individual shutoff
valve from the gas supply system during pressure
testing of the system at pressures higher than 1/2
pounds per square inch (psi) (3.45 kilopascals
[kPa]). If the test pressure is equal to or less
than 1/2 psi (3.45 kPa), close the manual shutoff
valve on the heater during the piping pressure
test.
7. If the gas supply pressure is less than required,
check for undersized pipe between the meter and
the heater, a restrictive fitting, or an undersized
gas meter. Gas supply pressures to the heater
are listed in Table 6.
9. Before operating the heater, test the complete
gas supply system and all connections for leaks
using a soap solution. Do not use an open flame.
CAUTION
Some leak test solutions (including soap and
water) may cause corrosion or stress cracking.
Rinse the piping with water after testing.
ATTENTION
Certaines solutions d’essai d’étanchéité (y
compris l’eau et le savon) peuvent causer de la
corrosion ou de la fissuration. Rincez les
tuyaux à l’eau après l’essai d’étanchéité.
4.2 Manifold Pressure
Confirm that gas supply pressure is correct. If
the gas supply pressure is less than required, check for
undersized pipe between the meter and the heater, a
restrictive fitting, or an undersized gas meter. Gas
supply pressures to the heater, when it is operating,
are listed in Table 6.
CAUTION
Manifold gas pressure for the LX and LT Low
NOx natural gas heaters should be set at 3"
WC. Propane heaters should be set to 9" WC.
ATTENTION
La pression du collecteur de pression pour les
systèmes de chauffage au gaz naturel devrait
être de 3'’ WC. Pour les sytèmes de chauffage
au gaz propane devrait être de 9'’ WC.
The manifold pressure may be checked by
connecting a manometer to the pressure port on the
outlet side of the valve. The pressure will be zero
when the heater is not running. When the heater is
operating the manifold gas pressure should be 3.0" WC
for natural gas heaters and 9.0" WC for LP gas
heaters. To adjust the manifold gas pressure, first
remove the slotted cap next to the inlet pressure port
on the inlet side of the gas valve. Under the slotted
cap is a slotted plastic screw which increases the
manifold pressure when turned clockwise and de-
creases the manifold pressure when turned counter-
clockwise. After measurements, and adjustments if
necessary, have been made, make sure to replace the
1/8" NPT gas valve plugs on the inlet and manifold
pressure ports, and the cap on the manifold pressure
adjustment screw. It is extremely important to replace
these parts before leaving the installation. Failure to
do so can result in damage to property or injury or
death. With the heater firing, the pressure must be
within the range shown in Table 6. Also check the
pressure with the heater off.
NOTE: The maximum inlet gas pressure must
not exceed the specified value. The minimum
value listed is for the purpose of input
adjustment. Refer to Table 6.
8. To connect the gas supply line to the heater's gas
valve, make sure the steel elbow (supplied with
the manifold) is screwed into the inlet side of the
gas valve. The heater is designed so that the gas
supply line may enter through either side of the
heater. Hand tighten the elbow until the desired
orientation is achieved.
CAUTION
Do not overtighten the elbow. Over tightening
will crack the gas valve. Do not use teflon tape
to wrap the elbow threads.
ATTENTION
Ne serrez pas trop le coude. Vous risqueriez
de fissurer la soupape de gaz. N’entourez pas
le filetage des coudes de ruban à joints.
Table 6. Gas Supply Pressure Requirements
Supply Pressure Minimum Maximum
Natural Gas 5.0 Inches WC 10.5 Inches WC
(1.2 kPa) (2.6 kPa)
LP Gas 11.0 Inches WC 14.0 Inches WC
(2.5 kPa) (3.5 kPa)
Manifold Pressure Nominal
Natural Gas 3.0 Inches WC (1.0 kPa)
LP Gas 9.0 Inches WC (2.2 kPa)
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