Gas Connections; Sediment Traps - Pentair MASTERTEMP 125 Guía De Instalación Y Usuario

Section 3. Installation Instructions
14

GAS CONNECTIONS

GAS LINE INSTALLATIONS
Before installing the gas line, be sure to check which gas the heater has been designed to burn. This is important because
different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is
designed to burn. Table 2, shown on
heater. The table is for natural gas at a specific gravity of .65 and propane at a specific gravity of 1.55.
When sizing gas lines, calculate three (3) additional feet of straight pipe for every elbow used. When installing the gas
line, avoid getting dirt, grease or other foreign material in the pipe as this may cause damage to the gas valve, which
may result in heater failure.
The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that
may be used on the same meter. The gas line from the meter will usually be of a larger size than the gas valve supplied
with the heater. Therefore a reduction of the connecting gas pipe will be necessary. Make this reduction as close to the
heater as possible.
The heater requires a gas supply of not less than 4" (10.2 cm) wc and not more than 14" (35.6 cm) wc. Gas supply
pressures outside of this range may result in improper burner operation. A minimum flowing or dynamic inlet pressure
(while the heater is running) of 4" (10.2cm) wc is required to maintain input rating with no more than a 2" pressure
drop between static and dynamic. The gas supply must be installed in accordance with the National Fuel Gas Code,
ANSIZ223.1, or standard CSA B149.1, Natural Gas and Propane Installation Codes, as applicable and all applicable local
codes. Install a manual shut-off valve and a sediment trap and union located outside the heater panels, see
not use a restrictive gas cock. The following minimum gas pipe sizes are recommended for natural gas supply piping,
15. For low pressure LP gas, pipe size may be reduced by 1/4", with a minimum pipe size of 1/2".
see Table 2 on page
Check for compliance with local codes.
The heater and any other gas appliances must be disconnected from the gas supply piping system during any pressure
testing on that system, (greater than ½ PSI). The heater and its gas connection must be leak tested before placing the
heater in operation. Do not use flame to test the gas line. Use soapy water or another nonflammable method.
A manual main shut-off valve must be installed externally to the heater.
DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET. THIS WILL VOID YOUR WARRANTY.

SEDIMENT TRAPS

Install a sediment trap and union located outside
the heater panels in accordance with National code
requirements. Do not use a restrictive gas cock. The
sediment trap shall be either a tee fitting with a capped
nipple in the bottom outlet which can be removed for
Figure
cleaning, as shown in
recognized as an effective sediment trap. All gas
piping should be tested after installation in accordance
with local codes.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
15, show which size pipe is required for the distance from the gas meter to the
page
NOTE
WARNING
6, or an other device
Figure 6. Do
18–24" of 3/4"
Manual
Gas line from
Shut-off
Valve
Valve
1" Dia. or larger
(See "Recommended
Pipe Sizes" Chart)
Bell
Reducer
At least 9"
At least 3"
Union
Sediment
Trap
Figure 6.
Rev. C 3/2019