Slant/Fin HWT-120 - Manual (Page 9)

9 INDIRECT FIRED WATER TANK
V WIRING
general wiring requirements
Wiring must conform to National Electrical Code in U.S.A.,
C.S.A. C22.1 Canadian Electrical Code Part 1 in Canada,
and any other national, provincial, state, or local code
requirements having jurisdiction.
All line voltage wiring must be a minimum 18 gage.
A separate service switch for the water heater electrical cir-
cuit is recommended. This switch must not turn off the boil-
er or other components in the heating system.
IMPortant note:
all wire connections to “t-t” or “a-a” terminals on boil-
er control must be from an isolated circuit which does
not carry voltage from an external source. any compo-
nent which does not have isolated end switches must
not be used unless a relay is added with the dry con-
tacts wired to these terminals.
The Slant/Fin Indirect Tank heater operates in much the same
way as an additional heating zone, either utilizing the same
circulator as household heating or its own circulator. The
heater temperature is maintained by the use of an immersion
type aquastat. The aquastat is installed into the immersion
well on the heater and secured by tightening the set screw or
clamp.
The aquastat operates in much the same way as a
thermostat. When the temperature falls inside the tank the set
of contacts make (close) and when the temperature rises the
contacts break (open).
The aquastat should be tied into the boiler system and
controls. When the tank calls for heat the aquastat contacts
close and signal the boiler controls, allowing the boiler to
maintain temperature and proper operation of the tank
circulator.
Slant/Fin recommends the use of a priority control to help the
boiler maintain desired temperature and satisfy the tank's
BTU requirements.
The Slant/Fin Indirect tank heater recovery ratings are based
on the boiler's ability to mainatain 180 degrees Fahrenheit. It
is important that the installer, plumber or heating technician
responsible for installing the heater, make certain that the
boiler capacity (BTU) is adequate to satisfy the heater's BTU
requirements.
is reversed through the tank coil (heat exchanger). The boiler water enters at the bottom of the coil and
exits from the top of the coil. At no time should live steam be used in the tank coil (heat exchanger).
DANGER
Water temperature over 125˚F. can
cause severe burns instantly or death
from scalds.
Children, disabled and elderly are at
highest risk of being scalded.
See instruction manual before setting
temperature at water heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.