Toyotomi FB-38N, Operation And Maintenance Instructions, Page: 29 / 41

10
WATER INJECTION AND AIR RELEASE FROM WATER HEATER PIPING
(FOR CLOSED CIRCUIT PIPING)
1. Connect the water outlet of the floor cistern (selected by dealer) with the water inlet of the
hot water pipe with a vinyl hose.
2. Connect the water inlet of the floor cistern with the city water outlet with a vinyl hose.
3. Antifreeze Solution specified by dealer should be used, and the density should be at a ratio
of 40% to 50%, as shown in the table.
Table of Antifreeze Solution composition ratio
Freezing temp. Antifreeze Solution City water
-10°C 40% 60%
-20°C 50% 50%
CAUTION: The rust proofing capability will be reduced if a Solution with a ratio less than
40% is used.
[Calculation formula for required amount of Antifreeze Solution]
Required amount of Antifreeze Solution (lit.) = {(Heat Exchanger Capacity of Water Heater) +
(retained water volume in radiator) + (retained
water volume in piping)} x Antifreeze Solution
ratio (%) x 0.01
4. Supply water into the fllor cistern, and then insert the Power Plug in the Receptacle.
5. Close the valve
①
, ope the Drain Valve and Water Supply Valve on the Water Heater
piping.
6. By supplying water in the Water Heater piping, inject the required amount of Antifreeze
Solution as per article 3 into the floor cistern.
7. As soon as the circulation water is drained, close the Drain Valve and then open the Air
Release Valve on the Water Heater piping to release air of the line.
8. Start the Circulation Pump to circulate water.
9. Close the Feed Valve after 10 minutes, and then disconnect the Power Plug.
NOTE: If air is released with each circuit connected to the Water Heater piping, the air
releasing will be more effective.
10. After air releasing, take off the vinyl hose between the floor cistern and Water Supply Valve.