Troubleshooting
The backup heater is off by default. Activation can only occur under
certain strict conditions and only if backup heat is needed. There are
several levels of safety.
•The GFCI breaker will trip if there is a ground fault. This protects the
system and users in the event of a short circuit or loose wire in the
power wiring.
• An internal thermal circuit breaker will trip if the heater exceeds
150°F . Reset for this control is manual. See below.
• There are a number of permissive factors that will inhibit the firing of
the SSR. Primarily, there must be minimal fluid flow.
Visual indicators: AFTER DISCONNECTING AC V18b POWER, Remove
the cover from the gang box exposing the Solid State Relay. If the units
are receiving a firing signal, the LED on the SSR(s) will be lit and may
be flashing. If the LEDs are lit, then power will be sent to the units
when the circuit breaker is on.
As noted, the second-level safety feature we have included is a safety
switch, a UL-Listed bi-metal
thermal overload
switch that opens and
breaks the element power connection in case of temperature rising
above 150°F. It is attached to the heater barrel interior wall.
If the thermal overload switch is tripping for no apparent reason, the
heating element may be in contact with the inside wall of the V18. See
section on proper installation / replacement of heating element.
17
Summary of Contents for V18-B
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