Hydronic Piping; General - Baxi LUNA DUO-TEC 60 GA Installation Instructions For The Installer

5 - HYDRONIC PIPING

Boiler rated at 50 psig (345 kPa) maximum allowable working pressure. Boiler provided with 30 psig (206 kPa)
safety relief valve.
When installing safety relief valve it must be installed in a vertical position with spindle at top.
System pressure above 43 psi [2.96 bar] WILL result in boiler shutting down.
• Poison hazard. Ethylene glycol is toxic. Do not use ethylene glycol.
• Never use automotive or standard glycol antifreeze, even ethylene glycol made for hydronic systems.
• Ethylene glycol can attack gaskets and seals used in hydronic systems.
• Do not use petroleum based cleaning or sealing compounds boiler system.
• Do not fill boiler or boiler system with softened water.
• Use only inhibited propylene glycol solutions certified by fluid manufacturer as acceptable for use with
closed water heating system.
• Thoroughly clean and flush any system that used glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet (MSDS) on fluid used.
Boiler and its individual shutoff valve shall be disconnected from gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psi (3.40 kPa - 34.47 mbar).
Boiler shall be isolated from the gas supply piping system by closing its individual manual shutoff valve during
any pressure testing of gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).
Install boiler so that gas ignition system components are protected from water (dripping, spraying,rain, etc.)
during appliance operation and service (circulator replacement, condensate trap, control replacement, etc.).

5.1 General

• Primary/Secondary piping required.
• Install piping in accordance with authority having jurisdiction.
• Support system piping and safety relief valve discharge piping. Boiler's internal piping and wall mount bracket can be
damaged if subjected to excessive weight.
The intended use of the internal heat exchanger pump is a boiler loop. Do not use as a primary system pump.
• Size central heating pump (and domestic hot water pump, if used) for system requirements only. Internal heat exchanger
pump compensates for pressure drop through boiler internal piping and heat exchanger.
• Thoroughly clean and flush system before connecting to boiler.
• If oil is present in system water, use approved detergent to wash system.
• It is necessary to semi-annually check the water quality of central heating systems.
• Manufacturer recommends installation of magnetic dirt separator in the hydronic system where there are cast iron or steel
components, or where the previous boiler was a cast iron heat exchanger. The abrasive, extremely fine sediment is difficult
to remove and can deposit onto heat exchange surfaces and accumulate in pump cavities causing reduced efficiency and
premature wear.
• Flush system to remove any solid objects such as metal chips, fibers, or Teflon tape, etc.
• Flush system until water runs clean and piping is free of sediment.
• Use purge valve to flush zoned systems, each zone separately. If purge valves and isolation valves are not installed, install
them to properly clean the system.
• When purging installations that include standing iron radiators and systems with manual vents at high points, start with
nearest manual air vent. Open the vent until water flows out, then close vent. Repeat this procedure, working toward
furthest air vent.
• Install a basket strainer if large amounts of sediment is present. Keep basket clear of sediment build up.
• Manufacturer recommends a water treatment product be used for sediment removal.
• Ensure piping in the heating system has an oxygen barrier.
• Manufacturer requires us of an approved mechanical fastener, which may vary per vent pipe manufacturer, at every push-fit
gasket connection when using a single wall polypropylene vent system.
240012485 REV C [06/30/2019]
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