KDB-GOM
Series
- 39 -
3. Installation of water piping
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The piping materials used should meet local codes and industry standards.
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Piping must be cleaned and flushed-out before installation.
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Do not apply torch heat within 300mm of the bottom connections of the unit.
■
Perform all solder connections at a safe distance from the (brass) male
connectors below the unit. Allow fittings to cool, before attaching to unit. Use only approved coupling unions with
O-rings to attach field piping to unit.
■
The ‘heating’ pipe should be 3/4" and of type-L copper. Never use aluminum, plastic, or galvanized steel piping.
■
The pipe size used for
supply
heating water should be the same size used for the
return
heating water.
■
Use only copper piping with lead-free solder for the domestic water side.
■
Since the expansion tank has already been installed in the unit, no separate tank is required.
■
The size of the domestic hot water pipe should be 1/2" diameter.
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The length of piping should be as short as possible and the piping should have minimal number of bends and
connections.
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Use only ball type isolating valves. Do not use gate valves.
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Never leave the heating pipes disconnected while operating the unit as a boiler. This will cause damage to the
heat exchanger and void the manufacturers warranty.
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All piping should be insulated.
■
After making the piping connections, check for gas or water leaks.
■
If the water supply pressure is 10 kgf/cm
²
or higher, install the reduction valve on the water supply piping.
■
If the water supply pressure is 0.3 kgf/cm
²
or lower, install a pressurizing pump.
