TX Series Installation, Operation, and Maintenance Manual
Diversified Heat Transfer, Inc.
439 Main Road, Route 202
Towaco, New Jersey 07082
Page
17
of
33
Phone: 800-221-1522
Website: www.dhtnet.com
NOTE:
When installing the TX Series Indirect Water Heater with a steam boiler, the water flow (direction) 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).
SECTON 5: ELECTRICAL AND CONTROLS WIRING
NOTE:
All wiring must be done in accordance with national, state, and local codes. Adhere to the National
Electric Code - ANSI/NFPA 70-1990 in the absence of any other codes.
FOR YOUR SAFETY:
Power must be shut off before installing or servicing the water heater. A separate shut-off switch should
be installed to support future servicing or an emergency shut down. The entire heating system should
have its own designated electrical circuit.
The TX Series water 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 water 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 water temperature falls below
desired set point inside the tank, the set of contacts make (close) and when the temperature rises above
the set point inside the tank, 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.
DHT recommends the use of a priority control to help the boiler maintain desired temperature and
satisfy the tank's BTU requirements (domestic water temperature).
The TX Series water heater recovery ratings are based on the boiler's ability to maintain 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.
