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4 Hydronic piping
Installation & Service Manual
RELIEF VALVE
Figure 4-1_Relief Valve - CBN315-500
This appliance is supplied with a relief valve(s) sized in
accordance with ASME Boiler and Pressure Ves sel Code,
Section IV (“Heating Boilers”). The re lief valve(s) is mounted
directly into the heat ex chang er inside the header (see
FIG.’s 4-1 and 4-2). To pre vent water damage, the dis charge
from the relief valve shall be piped to a suit able floor drain for
disposal when relief occurs. No reducing couplings or other
restrictions shall be installed in the discharge line. The
discharge line shall allow complete drainage of the valve and
line. Relief valves should be manually operated at least once a
year.
ƽ CAUTION
Avoid contact with hot discharge water.
FLOW SWITCH
Figure 4-2_Water Flow Switch - CBN315-500
A water flow switch is available as a factory sup plied option on
all heating boilers and water heaters (see section 7). The flow
switch should be wired between terminals X and B. Remove the
jumper between the X and B terminals on the terminal strip.
This wiring connection installs the flow switch in the 24 VAC
safety cir cuit to prove water flow before main burner ig ni tion. A
flow switch installed with the fac to ry sup plied minimum
adjustment setting requires a spe cif ic minimum flow to make
the switch and start burner operation. The flow rate required is
a function of the diameter of pipe and tee used for installation.
Ensure that the pump installed on the boiler will supply
adequate flow to make the flow switch con tacts and operate the
appliance.
Relief Valve
Water Flow Switch (if equipped)