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Gas Installation
Components
Supplied With Unit
Internal Gas Valve (installed)
External Gas Shut-Off Valve (loose)
FIRE OR EXPLOSION HAZARD:
• The gas used with this unit must be the type specified
on the spec plate on this unit. To avoid personal injury
or damage to the unit, never use any other than the
specified gas.
• The heater and its gas connection must be leak tested
before placing the Booster Water Heater in operation.
Use soapy water or commercially available fluid for leak
test. DO NOT use open flame to test for leaks.
• The Booster Water Heater and its individual shut-off
valve must be disconnected and isolated from the
gas supply piping system during any pressure testing
of the system at test pressures in excess of 1/2 psi
(3.5 kPa.).
• This appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
• Dissipate test pressure from the gas supply line before
re-connecting the heater and its manual shut-off cock to
the gas supply line. Failure to follow this procedure may
damage the gas valve. Over-pressurized gas valves are
not covered by the warranty.
• If the information in these instructions is not followed
exactly, fire or explosion may result causing property
damage, personal injury, or death.
PMG100200M-0222
WARNING
Optional With Unit
None
Gas Piping
DO NOT use Teflon tape on gas line pipe threads. A flexible
sealant suitable for use with applied gas is recommended.
The gas inlet pipe size is 3/4" NPT pipe thread fitting to the gas
valve. Provide an adequate size gas supply line. The line should
never be smaller than 3/4" NPT and should follow according to
the gas piping diagram below. The fitting is accessed through
the bottom of the case.
NOTE: Gas line should be of the approved type for use with
natural gas or propane.
Gas line should be kept as short as possible, sized to furnish
the rated BTU, and installed in a way to protect it from damage.
Gas piping must be installed in accordance with local plumbing
codes including a sediment trap, ahead of the heater gas
controls and a manual shut-off valve located outside the jacket.
NOTE: The internal gas valve is supplied with the heater, the
external manual gas valve supplied with unit must be
plumbed in by the installer.
Incoming Gas Pressure Specifications
Gas Type
Natural Gas
Propane/LP Gas
The maximum inlet gas pressure must not exceed the values
shown above. The minimum gas pressure listed is for the
purposes of input adjustment.
The manifold inside the heater is provided with a pressure tap
to measure the gas pressure. The chart below lists the proper
pressure amounts at the manifold pressure tap when testing.
Operating Pressure Specifications at Manifold
Gas Type
Natural Gas
Propane/LP Gas
See the "Gas Installation Diagram" illustration for hook-up
location and pressure tap location.
15
INSTALLATION
Supplied By Installer
Gas Supply Line
Sediment Trap
Union
Vent System
CAUTION
Inches Water Column
Minimum
Maximum
5.0
11.0
Inches Water Column at Pressure Tap
High Burn
3.5
10.0
10.5
13.0
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