Hydronic Piping; General - Dunkirk DCC-150 Installation, Operation & Maintenance Manual

Boiler rated at 50 psig (345 kPa) maximum
Note
allowable working pressure. Boiler provided with
30 psig (206 kPa) safety relief valve.
When installing safety relief valve it must be
Note
installed in a vertical position with spindle at
top.
System pressure above 43 psi [2.96 bar] WILL
Note
result in boiler shutting down.
FIGURE 5-1 Safety Relief Valve
System Supply
Safety Relief
Valve
TP Gauge
!
WARNING
• 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.

5 - HYDRONIC PIPING

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.
System Return
• Install piping in accordance with authority having
• Support system piping and safety relief valve discharge
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
• Thoroughly clean and flush system before connecting
• If oil is present in system water, use approved
• It is necessary to semi-annually check the water
• Flush system to remove any solid objects such as metal
• Flush system until water runs clean and piping is free
• Use purge valve to flush zoned systems, each zone
• When purging installations that include standing iron
• Install a basket strainer if large amounts of sediment is
• Manufacturer recommends a water treatment product
• Ensure piping in the heating system has an oxygen
15
!
WARNING
jurisdiction.
piping. Boiler's internal piping and wall mount bracket
can be damaged if subjected to excessive weight.
NOTICE
pump, if used) for system requirements only. Internal
heat exchanger pump compensates for pressure drop
through boiler internal piping and heat exchanger.
to boiler.
detergent to wash system.
quality of central heating systems.
chips, fibers, or Teflon tape, etc.
of sediment.
separately. If purge valves and isolation valves are not
installed, install them to properly clean the system.
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.
present. Keep basket clear of sediment build up.
be used for sediment removal.
barrier.
240011947 REV B, [03/31/2018]