Gas Requirements; Gas Line Installations; Sediment Traps - Pentair Pool Products MiniMax NT Series Service Manual

Gas Requirements

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.
Tables 1-5, shown on page
is 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 1.5.
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.
GAS
SUPPLY
Figure 4.
Rev. B 2-11-04
8, shows which size pipe
MANUAL
SHUT OFF
VALVE
NIPPLE
CAP
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 PSIG).
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. See Figure 4.

SEDIMENT TRAPS

Install a sediment in front of the gas controls.
The sediment trap shall be either a tee fitting with
a capped nipple in the bottom outlet which can be
removed for cleaning, as illustrated below, or a
other device recognized as an effective sediment
trap. All gas piping should be tested after installation
in accordance with local codes. See Figure 4.
Do not install the gas line union inside the heater
cabinet. This will void your warranty.
UNION
TEE
FITTING
3 INCHES
MINIMUM
HEATER CABINET
CAUTION
WARNING
GAS
VALVE
P/N
7
NTSM03