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4.7 SIZING AND CONNECTION SUITABILITY
- Check the gas type label to make sure that the unit was built for the type of gas you will be
using, and that the gas inlet pressure is within the appropriate range.(Please refer to p.8.)
- Gas pressure below this specied range for the water heater and/or insufcient gas volume will
adversely affect performance.
- Inlet gas pressure must not exceed the maximum values; gas pressure above the specied
range will cause dangerous operating conditions and damage to the unit.
- 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.
- 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 regulator is preset at the factory. It is computer controlled and is not to be adjusted by any
person other than a licensed professional.
- When the gas connections are completed, perform a gas leak test either by applying soapy
water to all gas ttings and observing for bubbles or by using a gas leak detection device.
4.8 MEASURING INLET GAS PRESSURE AND TESTING GAS LEAKAGE
①.Shut off the manual gas valve on the supply gas line.
②.Open a tap/outlet. The unit should turn on and the gas in the gas pipe line should be purged.
③.Leave the tap/outlet running until the unit shuts down due to lack of gas supply. Then turn off the tap/outlet.
④.Remove the screw on the pressure port located on the gas inlet of the water heater shown in
the diagram to the above.
⑤.Connect the manometer to the pressure port.
⑥.Re-open the manual gas valve. Check to see that there are no gas leaks.
⑦.Open some of the xtures that use a high ow rate to turn on the water heater.
⑧.Check the inlet gas pressurein the position showed in the red circle above When the water heater
is at a maximum operation capacity, the inlet gas pressure point must be within the appropriate
range.
(Please refer to p.11)
Conversion of this unit from natural gas to propane (LPG) or propane (LPG) to natural gas can
not be done in the eld. Contact your supplier to get the correct unit for your gas type.
WARNING
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