Takagi T-M32 - Manual (Page 15)

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GAS SUPPLY AND GAS PIPE SIZING
1. Turn off all electric power to the water heater if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit clockwise
3 to the off position.
WARNING: Conversion of this unit from natural gas to propane or vise versa
cannot be done in the field. Contact your local distributor to get the correct unit for
your gas type. Conversion done by anyone other than the manufacturer will void all
warranty. Takagi is not liable for any property and/or personal damage
resulting from unauthorized conversions.
*Check that the type of gas matches the rating plate first.
1. The minimum and maximum inlet gas pressures are:
Natural Gas Min. 5.0” WC - Max. 10.5” WC
Propane Gas Min. 8.0” WC - Max. 14.0” WC
2. Gas pressure below this specified range for the T-M32 and/or insufficient gas volume will adversely
affect performance.
These pressures are measured when the T-M32 is in full operation.
3. Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified
range will cause dangerous operating conditions and damage to the unit.
Ensure that any and all
gas regulators used are operating properly and are providing gas pressures within the specified
range shown above.
4. Until testing of the main gas line supply pressure is completed, ensure the gas line to the T-M32 is
disconnected to avoid any damage to the water heater.
MEASURING INLET GAS PRESSURE
The T-M32 cannot perform properly without sufficient inlet gas pressure. Below are instructions on how to
check the inlet gas pressure.
THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
1. Shut off the manual gas valve on the supply gas line.
2. Open a faucet. The unit should turn on and the gas in the
gas pipe line should purge. Leave the faucet on to keep
the unit running until the unit shut down due to lack of gas
supply. Then shut the faucet off.
3. Remove the screw for the pressure port located on the
gas inlet of the T-M32 shown in the diagram to the right.
4. Connect the manometer to the pressure port.
5. Re-open the manual gas valve. Check to see that there
are no gas leaks.
6. Open some of the fixtures that use the highest flow rate to
turn on the T-M32.
7. Check the inlet gas pressure. When T-M32 is on a
maximum burn, the manometer should read from 5.0” to
10.5” WC for Natural gas, from 8.0” to 14.0” WC for
Liquid Propane.
TO TURN OFF GAS TO APPLIANCE