Lochinvar 000 - 500, 45 Relief Valve Water Flow Switch if Equipped, Relief Valve Water Heater

RELIEF VALVE WATER FLOW SWITCH (IF EQUIPPED)

FIG. 23A Relief Valve - Water Heater

RELIEF

VALVE

FIG. 23B Relief Valve - Boiler

This appliance is supplied with a relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV (“Heating Boilers”). The relief valve(s) is mounted directly into the heat exchanger inside the header. To prevent water damage, the dis- charge 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.

￿CAUTION

Avoid contact with hot discharge water.

FIG. 24A Water Flow Switch Water Heater - Side Connections

FLOW SWITCH

FLOW

FIG. 24B Water Flow Switch Boiler - Top Connections

A water flow switch is available as a factory supplied option on all heating boilers and water heaters. 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 circuit to prove water flow before main burner ignition. A flow switch installed with the factory supplied minimum adjustment setting requires a specific minimum flow to make the switch and start burner operation. The minimum flow requirement to actuate the switch is specified in Table I. 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 or water heater will supply adequate flow to make the flow switch contacts and operate the boiler.

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