MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
16
GAS CONNECTIONS
GAS LINE INSTALLATIONS
The gas supply must be installed in accordance with the
Gas Installation Code, AS/NZS 5601.1
, as applicable and all applicable
local codes.
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.
Gas supply companies
are increasingly supplying natural gas to new installations with 2.75 kPa; this means 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 Type 1 or Type 2 as per AG201 and/or AS4617 standards, 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.
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.
GAS PIPE SIZING
Figure 9.
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
Table 2.
Heater
Size
Distance from the Meter
0 to 15 m
16 to 30 m
31 to 60 m
200
25 mm
32 mm
32 mm
300
32 mm
32 mm
40 mm
400
32 mm
40 mm
50 mm
INSTALLING A SEDIMENT TRAP/DRIP LEG
INSTALL A SEDIMENT TRAP/DRIP LED AND UNION LOCATED OUTSIDE THE HEATER PANELS IN ACCORDANCE WITH
NATIONAL CODE 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 6, 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.
FOR NEW HEATER INSTALLATION: SEE PAGE 17 TO
INSTALL THE GAS PIPE ESCUTCHEON. THIS ENSURES
THE HEATER IS RODENT RESISTANT.
Section 1. Installation
