P/N 475114 Rev. F 8/2020
MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide
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GAS CONNECTIONS
GAS LINE INSTALLATIONS
The gas supply must be installed in accordance with the
European Standard Codes of Practice for gas installation
as
applicable and all applicable local codes.
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR.
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 below shows the recommended gas inlet pipe sizes required for the distance from the gas meter
to the heater. The table is for G20, G25 (natural gas) at a specific gravity of .65 and G31 (propane) at a specific gravity
of 1.55. When sizing gas lines, calculate 0.9 additional meters 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. Insufficient gas supply will cause the heater to operate below its designed performance or
not at all. 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.
If the
gas pressure is not adjusted to the correct working pressure, the heater will be over gassed and cause serious damage
within minutes. This damage is not covered under the heater warranty.
Install a manual shut-off valve that conforms with European Standard Codes of Practice, and a sediment trap/drip leg
and union located outside the heater panels, see Figure 9. Do not use a restrictive gas cock.
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 6.0 kPa). 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.
NOTE
A manual main shut-off valve must be installed externally to the heater.
WARNING
DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET. THIS WILL VOID YOUR WARRANTY.
Figure 9.
Heater
Size
Distance from the Gas Meter
0 to 15 m
16 to 30 m
31 to 60 m
125
25 mm
32 mm
32 mm
Manual
Shut-off
Valve
Sediment
Trap/Drip Leg
Union
At least 23 cm (9")
At least 8 cm (3")
2.54 cm (1") Dia. or larger
(See "Recommended
Pipe Sizes" Chart
)
45-60 cm x 3/4 in
(18–24" of 3/4")
Gas line from
Valve
Bell
Reducer
SEDIMENT TRAPS (DRIP LEG)
Install a sediment trap and union located outside the heater
panels in accordance with European Standard Codes of
Practice. 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 cleaning, as shown in Figure
9, or an other device recognized as an effective sediment trap.
All gas piping should be tested after installation in accordance
with European Standard Codes of Practice.
Table 2.
Section 1. Installation
