Manifold Pressure - Jandy Lite2 Installation And Operation Manual

Model LD Pool and Spa Heater
Table 4. Natural Gas Pipe Size Requirements*
Distance from Gas Meter
0-50 feet
Heater (0-15 m)
Size in. (mm) in.
125 3/4 (19)
175 1 (25)
250 1 (25) 1-1/4
325 1-1/4 (32) 1-1/4
400 1-1/4 (32) 1-1/2
Notes:
*1.These numbers are for natural gas (0.65 Sp. Gr.) and are
based on 1/2 inch (13mm) water column pressure drop.
Check supply pressure with a manometer, and local code
requirements for variations. For liquefied petroleum gas,
reduce pipe diameter one size, but maintain a 3/4 inch
(19mm) minimum diameter.
2.Check supply pressure and local code requirements
before proceeding with work.
3.Pipe fittings must be considered when determining gas
pipe sizing.
4. Install a sediment trap (drip leg) ahead of the gas
controls (see Figure 5). Fit the trap with a
threaded cap which can be removed for cleaning.
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
Figure 5. The proper design for a sediment trap/drip leg.
50-100 feet 100-200 feet
(15-30 m) (30-60 m)
(mm) in. (mm)
1 (25) 1 (25)
1 (25) 1-1/4 (32)
(32) 1-1/4 (32)
(32) 1-1/2 (38)
(38) 1-1/2 (38)
Table 5. Gas Supply Pressure Requirements
Supply Pressure Minimum
Natural Gas 5.5 Inches WC
(1.4 kPa)
LP Gas 10.0 Inches WC
(2.5 kPa)

Manifold Pressure

Nominal
Natural Gas 4.0 Inches WC (1.0 kPa)
LP Gas 9.0 Inches WC (2.2 kPa)
gas meter. Gas supply pressures to the heater
are listed in Table 5.
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 5.
8. 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 5.
CAUTION
Manifold gas pressure for the Lite2 D natural gas
heaters should be set at 4" 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
4'' WC. Pour les sytèmes de chauffage au gaz
propane devrait être de 9'' WC.
Page 11
Maximum
10.0 Inches WC
(2.5 kPa)
14.0 Inches WC
(3.5 kPa)