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If a heater other than the in-line electric heater included in the
Sundance equipment system is used, certain issues must be addressed
to assure optimum operation of all components. These issues include:
(1) supplying power, (2) connecting the Sentry controls, (3) water
piping and (4) heater sizing. Note: If an external gas heater is to be
used, Sundance Spas recommends against using a heater rated at
more than 250,000 BTU.
External Electric Heater
Follow the heater manufacturer's instructions for installation of
the external electric heater. Use a power source separate from
that supplied to the equipment system.
Connecting External Electric Heater to Sentry Controls
If an external electric heater is to be used, you must supply a
separate 240V relay in a listed box. Connect wires (min. #16
AWG) from the heater 4 position terminal block on the Sentry
circuit board to energize the relay coil (Ill. 3). Run separate
power to the heater through the normally open contacts on this
relay.
Use of External Heater
Ill. 3
8
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