Gas Connection; Sizing And Connecting - Takagi GS-20W-AU5 Installation Manual And Owners Manual

8. GAS CONNECTIONS
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.

SIZING AND CONNECTING

Check the gas type label to make sure that the water heater is available for your gas, and that the
gas inlet pressure is within the appropriate range. (Please refer to p. 3.)
1. Gas pressure below this specified range for the water heater and/or insufficient gas volume will
adversely affect performance.
2. Inlet gas pressure must not exceed the above maximum values; gas pressure above the speci-
fied range will cause dangerous operating conditions and damage to the unit.
3. Until testing of the main gas line supply pressure is completed, ensure the gas line to the water
heater is disconnected to avoid any damage to the water heater.
• Size the gas piping for the water heater according to AS5601 installation code.
• Always use approved connectors to connect the unit to the gas line. Always purge the
gas line of any debris before connecting to the water heater.
• Install a manual gas shut-off valve between the water heater and the gas supply line.
• The manifold pressure is preset at the factory. It is computer controlled and is not to be
adjusted by any person other than a qualified Service Provider.
• When the gas connections are completed, it is necessary to perform a gas leak
test either by applying soapy water to all gas fittings and observing for bubbles or
by using a gas leak detection device.
WARNING
1. Turn off the electric power to the water
Power cord
Gas supply inlet
2. Confirm the position of the gas inlet. Do
Gas valve
10
CAUTION
heater and manual gas valve located on
the outside of the unit before beginning

gas connection.

not connect water line to gas inlet. It may
be critically damaged.