LXi
™
Pool/Spa Heater Installation and Operation Manual Page 17
7. If the gas supply pressure is less than required,
check for undersized pipe between the meter and
the heater, a restrictive fi tting, or an undersized
gas meter. Gas supply pressures to the heater are
listed in Table 6.
Table 6. Gas Supply Pressure Requirements*
Supply Pressure Minimum Maximum
Natural Gas 5.0 inches W.C.
(1.2 kPa)
10.5 inches W.C.
(2.6 kPa)
LP Gas 11.0 inches W.C.
(2.5 kPa)
14.0 inches W.C.
(3.5 kPa)
Manifold Pressure Nominal
Natural Gas 2.5 inches W.C. (0.6 kPa)
LP Gas 9.0 inches W.C. (2.2 kPa)
NOTE The maximum inlet gas pressure must not
exceed the specifi ed 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. Tighten the elbow until the desired orien-
tation is achieved.
CAUTION
Do not overtighten the elbow. Over tightening will
crack the gas valve. Do not use tefl on tape to wrap
the elbow threads.
ATTENTION
Ne serrez pas trop le coude. Vous risqueriez de fi s-
surer la soupape de gaz. N’entourez pas le fi letage
des coudes de ruban à joints.
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 fl ame.
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 fi ssuration. Rincez les tuyaux à l’eau après
l’essai d’étanchéité.
4.2 Manifold Pressure
Confi rm 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 fi tting, 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 LXi natural gas heat-
ers should be set at 2.5" 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 2.5'’ WC. Pour les sytèmes de chauffage au gaz
propane devrait être de 9'’ WC.
The manifold pressure may be checked by con-
necting 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 2.5" WC for natural
gas heaters and 9.0" WC for LP gas heaters.
If the manifold pressure indicated above is not
correct, check the gas train for possible problems.
Check the meter, gas line, gas fi ttings, and gas shut off
for under sizing. Check the gas valve inlet for excess
pipe dope, if all is correct, then it may be necessary to
adjust the gas valve regulator. To adjust the manifold
gas pressure, fi rst 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 clock-
wise and decreases the manifold pressure when turned
counterclockwise. After measurements, and adjust-
ments 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 in-
jury or death. With the heater fi ring, the pressure must
be within the range shown in Table 6. Also check the
pressure with the heater off.
4.3 Special Precautions for LP Gas
LP Gas is heavier than air and can therefore more
readily collect or “pool” in enclosed areas if provision
for proper ventilation is not made. Installation of pool
heaters in enclosed areas such as pits is not recom-
mended. However, if such an installation is required
be sure to pay special attention to proper ventilation
requirements for LP gas. Locate heaters a safe dis-
tance from LP gas cylinders and fi lling equipment.
Consult the National Fuel Gas Code (NFPA 54 / ANSI
Z223.1, latest edition), the Natural Gas and Propane
Installation Code in Canada (CAN/CSA B149.1, latest
edition), and any other local codes and fi re protection
authorities about specifi c installation restrictions in
your area.
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