TX Series Installation, Operation, and Maintenance Manual
Diversified Heat Transfer, Inc.
439 Main Road, Route 202
Towaco, New Jersey 07082
Page
12
of
33
Phone: 800-221-1522
Website: www.dhtnet.com
Expansion Tank
When a back flow device or check valve is installed in the system, a Thermal Expansion Tank designed
for use with potable water will be required. Locate the expansion tank on the domestic cold water line
near the heater between the back flow preventer or check valve and the heater (see piping diagrams).
Refer to the Thermal Expansion Tank manufacturer literature for sizing.
Vacuum Breaker
DHT recommends that a vacuum breaker be installed on the domestic piping to the heater. The vacuum
breaker protects the heater in the event that tank pressure falls below atmospheric pressure.
Temperature & Pressure Relief Valve (T&P)
A T&P is required on all TX Series Indirect Water Heaters. Install a T&P valve (long element type) into the
tapping designated for the T & P.
