47
LP-505 REV. 4.29.14
If relief valve seats properly, restore power to the water heater. Observe operation for five minutes and ensure it operates
properly.
Check the Burner
Clean the exterior of the burner.
Cleaning the Cold Water Inlet Filter (Draining the Water Heater)
1. Place a bucket under the appliance to collect the residual water inside the water heater.
2. Press the Power button on the control panel to turn off the electrical power to the water heater. Then turn off the gas valve.
3. Valve off the water heater from the system. If the water heater cannot be isolated from the system, turn off the main water valve.
Open the hot water faucets in the system to aid in draining the system.
5. Remove the cold water inlet filter. Then clean it with a toothbrush and clean running water. See Figure 37.
Figure 37 – Draining the Water Heater
6. Reinstall the cold water inlet filter.
7. Restore water service to the water heater by opening the isolation valves, or turning on the main water valve.
8. Turn on the gas valve. Turn on electrical power to the water heater and press the Power button to turn the water heater on.
Flushing the Water Heater
Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified service technician.
NOTE: Improper maintenance WILL VOID water heater warranty.
1. Disconnect electrical power to the water heater.
2. Close the shutoff valves on both hot water outlet and cold water inlet lines (V1 and V2). See Figure38.
3. Connect one hose (D1, Figure 38) to the valve (V3) and place the free end in a bucket. Connect one of the hoses (D3) to the
circulation pump outlet and the cold water inlet line to valve V4. Connect the other hose (D2) to the circulation pump inlet and place the
free end in the bucket.
Figure 38 – Flushing the Water Heater
4. Pour tankless water heater cleaning solution into the bucket. Ensure the cleaning solution is approved for potable water systems.
Place the drain hose (D1) and hose D2 to the pump inlet in the cleaning solution.
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