Lennox GCWB95W-150 Installation Instructions

25
240012994 Rev. B [08/31/2020]
6 - HYDRONIC PIPING
6.1 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.
NOTICE
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 ush 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 ne sediment
is dicult to remove and can deposit onto heat exchange
surfaces and accumulate in pump cavities causing reduced
eciency and premature wear.
• Flush system to remove any solid objects such as metal chips,
bers, or Teon tape, etc.
• Flush system until water runs clean and piping is free of
sediment.
• Use purge valve to ush 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 ows
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.
FIGURE 6-1 Safety Relief Valve
Note
Boiler rated at 50 psig (345 kPa) maximum
allowable working pressure. Boiler provided with
30 psig (206 kPa) safety relief valve.
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 ll boiler or boiler system with softened
water.
• Use only inhibited propylene glycol solutions
certied by uid manufacturer as acceptable for use
with closed water heating system.
• Thoroughly clean and ush any system that used
glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet
(MSDS) on uid used.
!
Safety Relief Safety Relief
ValveValve
Note
When installing safety relief valve it must be
installed in a vertical position with spindle at
top.
TP GaugeTP Gauge
System SupplySystem Supply
System ReturnSystem Return
Note
System pressure above 43 psi [2.96 bar] WILL
result in boiler shutting down.

Lennox GCWB95W-150 Specifications

General

Brand	Lennox
Model	GCWB95W-150
Category	Boiler
Language	English