1
Installation vent terminator Clearance
Gas Supply and Gas Piping Sizing
This unit needs a manual gas control valve
(System Shutoff Valve) that must be placed on
the unit before it is connected to the gas line.
Check the gas inlet pressure and the type of
gas matches the rating plate located on your
water heater. Insufficient gas pressure and
volume will cause your MOBIUS Water Heater
to be inefficient performance and not work
properly. Sizing of gas piping system correctly
following ANSI233.1/NFPA 54, or by local code.
The minimum and maximum inlet gas
pressures are listed below
Natural Gas
Min. 5” WC
Max. 10.5” WC
Propane Gas
Min. 11” WC
Max. 14” WC
When measuring the inlet supply pressure, the
water heater and all other gas appliances
sharing the water heater gas supply line must
be firing at maximum capacity. Maximum gas
pressures must not exceed this value. Low gas
pressure could be caused by an undersized
gas pipe, this will cause the MOBIUS water
heater’s performance to diminish and unable to
reach maximum performance.
When connections are completed, check for
gas leaks by applying soapy water to all gas
fittings and connections. Soap bubbles are a
sign of gas leaks.
This appliance and its individual shut-off valve
must be isolated from the gas supply piping
system by unplugging the unit and turning off
the main gas valve during any pressure testing
of the gas supply piping system at test
pressures equal to or less than ½ Psi. The
appliance and its gas connections must be
leak tested before placing the unit in operation.
Always use approved connectors to connect
the unit to the gas line. Always purge the gas
line of any debris before connecting to the
heater gas inlet.
WARNING:
Conversion of this unit from
natural gas to propane or propane to natural
gas cannot be done in the field. Contact your
local retailer or distributor to get the correct unit
for your gas type. Conversion done by anyone
other the manufacture will void any and all
warranty.
