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GAS CONNECTIONS
GAS LINE INSTALLATIONS
The gas supply must be installed in accordance with the British 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 natural gas at a specific gravity of .65 and 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 British Standard Codes of Practice , and a sediment trap/drip leg and union
located outside the heater panels, see Figure 6. 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.
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.
GAS PIPE SIZING
D
H
e
t a
r e
S
z i
e
0
o t
1
5
2
0
0
2
5
m
3
0
0
3
2
m
4
0
0
3
2
m
SEDIMENT TRAP/DRIP LEG
Install a sediment trap/drip leg and union located outside the
heater panels in accordance with British Standard Codes of Practice requirements. Do not use a restrictive gas cock.
The sediment trap/drip leg shall be either a tee fitting with a capped nipple in the bottom outlet which can be removed for
cleaning, as illustrated in Figure 14, or an other device recognized as an effective sediment trap/drip leg. All gas piping
should be tested after installation in accordance with local codes.
P/N 475106 Rev. A 2/2014
Table 2.
s i
a t
n
c
e
f
o r
m
h t
e
M
t e
r e
m
1
6
o t
3
0
m
3
1
o t
m
3
2
m
m
3
2
m
3
2
m
m
4
0
m
4
0
m
m
5
0
NOTE
WARNING
6
0
m
m
m
m
m
m
m
MASTERTEMP
™
Pool and Spa Heater Installation and User's Guide
Section 2. Installation
Figure 13.
46-61 cm of 1.91 cm
(18–24" of 3/4")
Manual
Gas line from
Shut-off
Valve
Valve
2.54 cm (1") Dia. or larger
(See "Recommended
)
Pipe Sizes" Chart
Bell
Reducer
At least 22.9 cm (9")
At least 7.6 cm (3")
Union
Sediment
Trap/Drip Leg
| 11
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