Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 13)

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5.1 General
• Install piping in accordance with authority having jurisdiction.
NOTICE
Use two (2) wrenches when tightening and fitting
to pipe boiler's threaded fittings. Boiler's internal
piping can be damaged if subjected to excessive
torque.
• 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.
• 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.
• Flush system to remove any solid objects such as metal
chips, fibers, or Teflon tape, etc.
5.2 Special Conditions
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certified by fluid
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
• Boiler installed above radiation level (or as required by
authority having jurisdiction). Integral low water cutoff
provided in boiler. See pages 9 & 10.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation. Install
flow control valves or other automatic means to prevent
gravity circulation of boiler water during cooling cycle.
5.3 Safety Relief Valve and Air Vent
NOTICE
Boiler rated at 150 psig (1.03 MPa) maximum
allowable working pressure. Boiler provided with
30 psig (206 kPa) safety relief valve. Field source
safety relief valve for system pressures greater
than 25 psig. Temperature Pressure Gauge and Air
Vent satisfactory for 75 psig operation. Field source
temperature pressure gauge for system pressures
greater than 60 psig.
• Install safety relief valve and air vent using pipe fittings
provided with boiler. See figure 5-1
• Install safety relief valve with spindle in vertical position.
• Do not install shutoff valve between boiler and 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.
• Use only inhibited proplyene 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.
!
NOTICE
Do not expose boiler and condensate piping to
freezing temperatures.
FIGURE 5-1 Safety Relief Valve & Air Vent (Viewed
from front of boiler)
Safety Relief
Valve
3/4" NPT
Nipple
3/4" x 1/4" NPT
90° Elbow
3/4"F x 3/4"M
NPT Tee
3/4 NPT
Air Vent
Position Air Vent and Safety Relief Valve
to provide space for discharge piping.
5 - HYDRONIC PIPING