Toyotomi BS-35(F) - Manual (Page 12)

12
2. DRAINING WATER
When you do not plan to use the unit for an extended period, the following procedures are
recommended.
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 pressure relief valve.
7. Press the drain valve of the pressure reducing 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 pressure relief valve.
4. Close all the hot and cold mixing faucets once.
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 position 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 for 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 start the water heater, open a valve for a hot and cold mixing faucet to make sure that
water flows out. Neither water flow nor smooth water flow occurs when the water heater and
piping system are frozen. If this happens, wait until such frozen water is melted and re-start the
operation of the water heater when water flows properly.
LONG TERM INACTIVITY
When leaving the unit unused over a long period of time, drain the heat exchanger and pipes
thoroughly and disconnect the electrical cord.