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Part Number PLUS-E017-A/1206
13
Manual • Installation • Start-Up • Usage • Maintenance • Parts
General piping
information
• For domestic water piping, see pages 8 through 12.
• See pages 22–23, for domestic water recirculation piping.
• See Table 1 for piping connections:
• All plumbing must meet or exceed all local, state and national plumbing codes.
• Use pipe dope or tape suitable for potable water.
• Use isolation valves to isolate system components.
• See Section B for Gas boiler and system piping or Sections C boiler and system piping
with other boilers.
Water hammer
Dishwashers, clothes washers, and fast-closing positive shutoff valves incorporated in the system
all contribute to creating water shock. Install a water hammer arrester to prevent damage to pipes
and appliances. See control manufacturer’s instructions for application and installation.
Thermal expansion
If a backflow preventer, check valve, or pressure reducing valve is piped
on cold water inlet of water heater, you must install an expansion tank on
cold water supply line to prevent normal thermal expansion from repeat-
edly forcing open T&P relief valve. The T&P relief valve is not intended
for constant duty, such as relief of pressure due to repeated normal system
expansion.
Refer to expansion tank manufacturer’s instructions for proper sizing.
Failure to follow the above could result in severe personal injury, death or
substantial property damage.
Table 1
Piping (Inches NPT)
Water
Heater
Model
Connections Recommended
Piping Between
Water Heater
and Boiler
Recirculation Dip Tube
Domestic
Water
Inlet/Outlet
Boiler Water
Supply/
Return
Length
(inches)
Diameter
(inches)
30 ¾ 1 1 34 ¾
40 ¾ 1 1 42 ¾
60 ¾ 1 ¼ 1 ¼ 52 ¾
80 ¾ 1 ¼ 1 ½ 61 ¾
100 1 ½ 1 ½ 1 ½ 25 1 ½
110 1 ½ 1 ½ 1 ½ 32 1 ½
119 1 ½ 2 2 32 1 ½
Water heater piping continued
If domestic water-side pressure exceeds 70 psig, install a pressure
reducing valve to prevent pressure spikes. Higher pressures can cause the
heater pressure/temperature valve to lift or weep.
A2