Specifications

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 tting, or an undersized gas
meter. Gas supply pressures to the heater are listed
in Table 5.
Table 5. Gas Supply Pressure Requirements
Supply Pressure Minimum Maximum
Natural Gas 5.5 inches
W.C.
(1.4 kPa)
10.0 inches W.C.
(2.5 kPa)
LP Gas 10.0 inches
W.C.
(2.5 kPa)
14.0 inches W.C.
(3.5 kPa)
Manifold Pressure Nominal
Natural Gas 4.0 inches W.C. (1.0 kPa)
LP Gas 9.0 inches W.C. (2.2 kPa)
NOTE The maximum inlet gas pressure must not
exceed the specied 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 ame.
Some leak test solutions (including soap and
water) may cause corrosion or stress cracking.
Rinse the piping with water after testing.
CAUTION
Certaines solutions d’essai d’étanchéité (y
compris l’eau et le savon) peuvent causer de la
corrosion ou de la ssuration. Rincez les tuyaux à
l’eau après l’essai d’étanchéité.
ATTENTION
4.2 Manifold Pressure
Con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 tting, or an undersized gas meter. Gas
supply pressures to the heater, when it is operating, are
listed in Table 5.
3. Use the gures in Table 4 to size the gas inlet
piping from the gas meter to the heater. Check all
local codes for compliance before installing the
heater.
Table 4. Supply Gas Pipe Size Requirements*
Distance from Gas Meter
Heater
Size
0-50 feet
(0-15 m)
50-100 feet
(15-30 m)
100-200 feet
(30-60 m)
in. mm in. mm in. mm
125 3/4 19 1 25 1 25
175 1 25 1 25 1-1/4 32
250 1 25 1-1/4 32 1-1/4 32
325 1-1/4 32 1-1/4 32 1-1/2 38
400 1-1/4 32 1-1/2 38 1-1/2 38
NOTES:
*1. These numbers are for natural gas (0.65 Sp. Gr.) and are
based on 1/2 inch (3.45 kPa) water column pressure drop.
Check supply pressure with a manometer, and local code
requirements for variations. For LP gas, reduce pipe diam-
eter by one size, but maintain a minimum 3/4" diameter.
2. Check supply pressure and local code requirements before
proceeding with work.
3. Pipe ttings must be considered when determining gas pipe
sizing.
4. This table shows the minimum supply gas pipe size
required. Larger pipe size can be used if required by local
code or if desired. It is critical that the incoming gas supply
pressure at the heater is within the maximum and minimum
pressure requirements of Table 5, Gas Supply Pressure
Requirements. If the range of acceptable supply pressure
is not provided, the gas supply system to the heater must
be modied to meet the pressure requirement of Table 5.
4. Install a sediment trap (drip leg) ahead of the gas
controls, see Figure 6. Fit the trap with a threaded
cap which can be removed for cleaning.
Figure 6. Proper Design for a Sediment Trap/Drip Leg
APPROVED
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 ow to the heater.
Page 14
ENGLISH
Jandy
®
Legacy™ Model LRZE Pool/Spa Heater by Zodiac
®
|
Installation and Operation Manual