Trim Piping; System Piping - Dunkirk Helix VX-050 Installation, Operation & Maintenance Manual

WARNING
!
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
FIGURE 5-2 Safety Relief Valve Discharge Piping
Check Local Codes
For Maximum
Distance To Floor
FIGURE 5-3 Temperature Pressure Gauge and Drain
Valve Installations
Temperature Pressure
Gauge shown at
System Supply
Connection
5 - HYDRONIC PIPING
Safety Relief Valve
Drain Valve shown
at System Return
Connection to Boiler
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain
piping.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
• Arrange piping to prevent water dripping onto boiler.

5.4 Trim Piping

• Temperature - Pressure Gauge. Install temperature
pressure gauge using adapter, tee and bushing provided
with boiler. See figure 5-3.
• Protect chassis grommets from heat damage while
soldering.
• Drain Valve. Install drain valve using, tee and adapter
provided with boiler. See figure 5-3.

5.5 System Piping

• See Table 3 for basic system piping configurations.
• Systems with automatic fill valves require back flow
prevention device.
• Single boiler system. See figures 5-4A, 5-5, 5-6, 5-7A & B
for general guidance. Additional considerations:
• Boiler control is designed for single central heating
pump. Installer responsible for integration of
multiple central heating pumps.
• Boiler control allows domestic hot water
prioritization. Function could be lost if central
heating pump not directly connected to control
system.
• Multiple boiler system. See figures 5-8A, B & C for
general guidance. Additional considerations:
• Control system requires equivalent water
temperatures entering each boiler to properly
sequence and adjust system supply temperature.
• Install multi boiler sensor kit. See "Parts, Kits &
Optional Accessories" manual for part number.
• Low Water Cutoff (LWCO) probe location. See figures
5-4A for minimum probe height. Do not install shutoff
valve between boiler and LWCO probe.
• If boiler is below radiation level, use figure 5-4A.
Boilers above radiation level use figures 5.4B thru
5.4D.
• If using separate stand pipe, install air vent using
tee to avoid nuissance shutdowns.
• See figures 5-4B, 5-4C and 5-4D for suggested
probe location alternatives.
• Arrange piping to prevent water dripping onto boiler.
14
P/N# 240010618, Rev. E [07/2015]