Long Term Inactivity - Toyotomi Oil Miser OM-180 Operation & Maintenance Instructions Manual

2. DRAINING WATER
When you do not plan to use the unit for an extended period, the following procedures are recommend-
ed.
1. Turn the unit off.
2. Disconnect the power supply cord.
3. Close the fuel tank valve securely.
4. After closing the main water supply valve, open up all the faucets.
5. Open the drain valve on the bottom of the unit.
6. Pull up the lever of the temperature and pressure relief valve.
NOTE: If the water heater is not used in the winter season or in a cold region where the water supply
is frozen, or if it is not used for a long period of time, the water heater should be drained and
related piping system shut off completely.
When re-supplying water in the water heater and system:
1. Close the air exit valve, if it is provided for the piping.
2. Close the drain valve.
3. Pull down the lever of the temperature and pressure relief valve.
4. Close all the hot and cold mixing faucets.
5. Fully open the main water supply valve.
6. First slowly open the valve for the hot and cold mixing faucet which is located in the farthest posi-
tion and gradually increase the flow rate as water starts flowing continuously.
NOTE: Since the water heater and piping system still have much air left after they are drained, a flash
flow of water may be caused by such air pressure when re-supplying water through them. First
open the valve carefully and gradually increase its opening to "Full Open" when the water flow
becomes stable. When air bubbles disappear in the water, fully open the valve for hot and cold
mixing faucet.
7. Also flow water through other hot and cold mixing faucets by the procedure of item 6 above.
8. Fully open the feed fuel valve of the fuel tank.
9. Connect the power supply cord.
10. Press the the "POWER SWITCH" to "ON" position.
11. Next open the valve for hot and cold mixing faucet, so hot water will flow out.
Operation start of the water heater in a cold region:
Before starting the water heater, open a valve for a hot and cold mixing faucet to make sure that water flows
out. If there is no water flow on a slow flow, the water heater and piping system may be frozen. If this hap-
pens, wait until such frozen water is melted and re-start the operation of the water heater when water flows
properly.
When leaving the unit unused over a long period of time, drain the heat exchanger and pipes thoroughly
and disconnect the electrical cord.
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LONG TERM INACTIVITY