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2-17 TESTING OPERATION
• Follow the steps below, to ensure the MWH-180EX has been properly installed.
1. Fully open the water supply main valve.
2. Flush out the water supply piping to clean out any installation debris, clean out filter.
3. Turn on power to unit and open gas supply valve.
1. Operate the unit according to “ Remote controller operation ” in the instruction manual.
2. Make sure the unit operates normally.
• Does the burner ignite and shut off properly? Check the combustion lamp.
The burner may not ignite at first until the air in the gas supply pipe is driven out.
Repeat the procedure until it ignites.
• Is temperature setting workable?
Check if the temperature can be adjusted as desired.
• If the residence is not ready for habitation or the unit will not be used for an extended time, the
residual water in the unit and the pipe may freeze and damage the unit, or the residual water in
the heat exchanger may deteriorate.
Be sure to remove the water in the unit and the pipe. Refer to the instruction manual.
1. Close the gas supply main valve.
2. Close the water supply main valve
3. Take off the water filter (drain stopper), drain the valve, and remove the water.
Take this procedure when the unit cools down after the testing operation.
4. Disconnect the power, or turn off the power supply.
5. Open the faucet and shower faucet (if any) and remove the water.
6. Leave the unit in this condition until ready to use.
Fill out the warranty form with the customer and send to it MPI.
Explain the “ How to use the unit ” section of this instructional manual to the customer.
Preparation for testing operation.
Testing operation.
Procedure after testing operation.
Explanation to customers.
