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H. PIPING INSTALLATION
This boiler should not be operated as a potable hot water heater. It should not be used as a direct hot water
heating device.
Basic steps are listed below that will guide you through the installation of the boiler.
1. Connect the system return marked “Boiler Return”.
2. Connect the system supply marked “Boiler Supply”.
3. Install a purge and balance valve or shut off valve and drain on the system return to purge air out of each zone.
4. Install a back flow preventer on the cold feed make-up water line.
5. Install a pressure reducing valve on the cold feed make-up water line (15 psi nominal on the system return).
This boiler has a maximum working pressure of 160 psi. You may order a higher pressure relief valve kit from the
factory. Check temperature and pressure gauge when operating. It should read a minimum pressure of 12 psi.
6. Install a circulator as shown in piping details (this section). Make sure the circulator is properly sized for the
system and friction loss.
7. Install an expansion tank on the system supply (see Part 4, Section D for water volume). Consult the expansion
tank manufacturer’s instructions for specific information relating to expansion tank installation. Size the expansion
tank for the required system volume and capacity.
8. Install an air elimination device on the system supply.
9. Install a drain valve at the lowest point of the system. NOTE: The boiler cannot be drained completely of water
without purging the unit with an air pressure of 15 psi.
10. The relief valve and temperature and pressure gauge are included in the boiler accessory kit. A pipe
discharge line should be installed 6” above the drain in the event of pressure relief. The pipe size must be the
same size as the relief valve outlet.
NEVER BLOCK THE OUTLET OF THE SAFETY RELIEF VALVE.
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