Lochinvar 000 - 500 User Manual

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. 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.

A water flow switch is available as a factory sup plied
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 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 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 con tacts and
operate the boil er.

Avoid contact with hot discharge water.

 CAUTION

RELIEF 

VALVE

FLOW SWITCH

FLOW