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8 ACCESSORIES
8.1 WATER FLOW SWITCH (shipped loose)
A water flow switch is shipped loose and is to be installed in the outlet piping on all heating boilers and
hot water supply boilers. The flow switch is wired in series with the 24VAC safety control circuit. A
diagnostic light will be indicated on the control display on a low flow condition.
8.2 LOW WATER CUTOFF (If Equipped)
If this boiler is installed above radiation level, a low water cut-off device must be installed at the time of
boiler installation. Some local codes require the installation of a low water cut-off on all systems.
Electronic low water cut-offs are available as a factory supplied option on all models. Low water cut-offs
should be tested every six months. The normally open switch contact of the low water cutoff is to be wired
in series with the flow switch. A diagnostic light will be indicated on the control display on a low flow
condition. Caution: remove jumper when connecting to 24 VAC circuit.
Figure 3: Low Water Cutoff Electrical Connections
8.3 RELIEF VALVE (shipped loose)
This appliance is supplied with a relief valve sized in accordance with ASME Boiler and Pressure Vessel
Code, Section IV (“Heating Boilers”). The relief valve is to be installed in the vertical position and mounted
in the hot water outlet. No valve is to be placed between the relief valve, and the appliance. To prevent
water damage, the discharge from the relief valve shall be piped to a suitable 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.
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