Toyotomi FB-38N(FS) - Manual (Page 27)

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NOTE: Be sure to install the Pressure Relief Valve in the proper direction.
CAUTION: Be sure to assemble the piping system at a pressure than 100 kPa because the
maximum water pressure is 100 kPa. If not, the heat exchanber may be
damaged. Be sure to install a Pressure Relief Valve in the heating water piping
on the inlet side of the Circulation Pump.
CAUTION: Use a pipe with a nominal diameter of 25A (R1) [FB-52N(FS): 40A (R1)] between
the Water Heater and header. If not, air will become trapped and result in
insufficient filling of Antifreeze Solution. This condition may lead to create holes on
the heat exchanger.
1. Install heaat insulation material on the hot water piping to prevent heat loss.
2. Be sure to use Antifreeze Solution specified by dealer with proper mix proportion for
circulation water to prevent freezing and corrosion.
3. Copper or stainless steel pipe should be used for the main and branch pipes.
4. Be sure to connect a hot water pipe with the Semi-closed Expansion Tank or Closed
Expansion Tank, and install at the inlet side of the Circulation Pump.
5. Install an Air Separator and Air Release Valve in the hot water pipe to release air inside of
the pipe.
6. Be sure to install a Bypass circuit. (Closing the hot water pipe with a thermal valve or
temperature control valve may cause problems in the Circulation Pump.)
7. Be sure to install unions in the hot water inlet and outlet sides for the purpose of
maintenance.