STP SERIES Install, Operation, and Maintenance Manual
SECTION 1: GENERAL INFORMATION
Page
6
of
97
Diversified Heat Transfer, Inc.
•
439 Main Road
•
Towaco, New Jersey 07082
Rev-1
09/11/2019 PHONE: 800-221-1522
•
WEBSITE: www.dhtnet.com
STP Manual
1.6 DESIGN CONDITIONS
DHT has design, engineering, and manufacturing capabilities to produce products to satisfy a
wide range of our customer requirements. Standard tank sizes range from 175 to 500 gallons.
DHT standard design conditions for STP Series units are:
Design Pressure, PSIG
150
Design Temperature, °F
210
NOTES:
1. Units are also available in larger storage tank capacities. Consult with DHT sales
representative if larger storage capacity unit is required.
2. Consult the design specifications for the unit or the name plate attached to the unit and a tag
on T&P Relief valve for maximum pressure of the unit.
1.7 CONSTRUCTION
All DHT STP Series units are designed and manufactured from superior materials of highest
quality. Each heat exchanger meets or exceeds requirements of ASME Section VIII, Div.1 Code
and storage tank meets or exceeds requirements of ASME Section IV HLW Code.
Heat exchangers:
Heat exchangers are available in both simplex and duplex configurations
depending upon customer requirement. Plates are stainless steel construction brazed together
and available in standard double-wall plate’s arrangement to prevent mixing of hot and cold
fluids.
Storage tank:
Storage tanks are available in standard carbon steel with double glass lining and
optional duplex stainless steel material construction depending upon customer requirement.
Carbon steel tank configuration also includes consumable anodes. Optional powered anodes
are also available for maintenance free operation by preventing corrosion of the tank and
anodes are not consumed. Dispersion tubes are installed inside storage tank on brazed plate
heat exchangers inlet and outlet connections which helps to prevent mixing of hot and cold
domestic water.
Controls and trim:
DHT Standard STP Series units are equipped with electronically activated
fully modulating optional control valves or VFD pumps which ships loose with the unit for field
installation. Installation is easy hook-up, plug-and-play with wiring harness. Units are equipped
with an advanced control panel with touchscreen user interface display, easy adjustable set
points, and set points for safety alarm system, if it is required a data port for a communication
with Building Management System. Backup LCD display on PID controller is also available
behind the front door. Controls offer tight temperature control performance in water heating
applications.
Standard package also includes ASME Temperature and Pressure Relief valve in domestic
water piping and recirculating water line with circulator(s).
Fabricated skid package includes single point inlet and outlet piping connections to produce
domestic hot water using heating hot water. Copper construction domestic water piping
manifolds including necessary fittings and combination of unions, victaulic couplings and wiring
harness, etc. which makes it easy to remove and assemble the components together.
Optional simple control solution
also available which includes aquastat to enable/disable
pump(s) to maintain domestic water storage temperature set point.
