IBC INTERSTAR IWT Series, Инструкция по установке и эксплуатации

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The water heater connection labeled “Out to Boiler” should be piped to the boiler return, piping as close
to the boiler as possible and after any flow control or check valves in the space heating return piping.
We recommend the use of a union and a shut-off valve. The use of a check valve is required to prevent
back flow through the water heater during operation of the space heating system.
3.4 Zone valve system (residential only)
IBC recommends using minimum size 1" pipe and 1" full-port zone valves with a high CV on the water
heater zone to ensure adequate flow.
The water heater connection labeled “In from Boiler” must be piped to the boiler supply piping after the
air purger and grouped with the other zone supplies. The use of a shut-off valve is recommended for
future service convenience.
The water heater connection labeled “Out to Boiler” should be piped to the boiler return piping and
grouped with the other zone returns. We recommend using a union and a shut-off valve. The use of a
check valve is required to prevent back flow through the water heater during operation of the space
heating system.
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3.4 Zone valve system (residential only)