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Heat Transfer STP Series Installation, Operation And Maintenance Manual

Indirect fired, storage, boiler water heater
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STP Series
Indirect Fired, Storage, Boiler Water Heater
(Brazed Plate Double Wall Heat Exchangers and Storage Tank)
This manual applies to the following units:
•
Simplex STP units
•
Duplex STP units
CONTRACTOR / FACILITY DATA
NOTE:
This
user
manual
accompany the specific unit as recorded below:
Model #: ____________________________
Serial #: ____________________________
Install Date: _________________________
Latest Update: 09/11/2019
The information contained in this document is subject to change without notice from Diversified Heat Transfer, Inc. (DHT). DHT makes
no warranty of any kind in respect to this material, including, but not limited to, implied warranties of merchantability and fitness for a
particular application. DHT is not liable for errors appearing in this document, nor for incidental or consequential damages occurring in
connection with the furnishing, performance, or use of these materials.
Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082
Rev-1
STP Manual
must
always
DISCLAIMER
PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com
Installation, Operation, and
Maintenance Manual
DHT STP SERIES WATER HEATER
(Duplex Version Shown)
Page 1 of 97
09/11/2019

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Summary of Contents for Heat Transfer STP Series

  • Page 1 DISCLAIMER The information contained in this document is subject to change without notice from Diversified Heat Transfer, Inc. (DHT). DHT makes no warranty of any kind in respect to this material, including, but not limited to, implied warranties of merchantability and fitness for a particular application.

  • Page 2: Table Of Contents

    3.8 UNIT STARTUP PROCEDURES ........................ 29 3.9 UNIT SHUTDOWN PROCEDURES ......................30 3.10 CONTROLLER INTRODUCTION ......................32 Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 2 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 3 6.5.2 STP Series Installation Form ..........................89 6.5.3 STP Series Startup Form ............................93 SECTION 7: WARRANTY ......................... 95 Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 3 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 4: General Information

    SECTION 1: GENERAL INFORMATION 1.1 INTRODUCTION The purpose of this manual is to provide an installation, operation, and maintenance procedural guide for the STP Series water heaters, which includes the following model options: • • STP Simplex Double Wall Brazed Plate STP Duplex Double Wall Brazed Plate These are boiler water or HTHW to domestic storage water heating units.

  • Page 5: Features

    • Double Wall Brazed Plate stainless steel construction heat exchanger • ASME compliance heat exchanger and storage tank 1.4 APPLICATIONS STP Series units are used in wide range of domestic water heating applications including either new construction or replacement of existing units. Most common application examples include: •...

  • Page 6: Design Conditions

    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.

  • Page 7: Safety

    DHT. 1.8.3 Safety Features The customer is responsible for maintenance of the safety features of the STP Series water heater such as guards, safety labels, safety controls, interlocks and lockout devices. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082...

  • Page 8: Safety Notation

    Proper training is the best protection against accidents. Operating and service personnel must be thoroughly familiar with the basic construction and operation of the STP Series storage water heater and all applicable safety precautions. If any of the provisions of this manual are not fully and completely understood, contact DHT technical service for advice and information.
  • Page 9 DO NOT use this water heater if any part has been under water. Call a qualified technician to inspect and replace any part that has been under water. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 9 of 97 PHONE: 800-221-1522 •...

  • Page 10: Installation Instructions

    2.1 RECEIVING, HANDLING, AND STORAGE STP Series water heater base frame is designed in such a way that unit can be carried from both sides using forklifts or pallet jacks provided proper care must be taken to prevent any damages to the unit and its components.

  • Page 11: Examining The Unit

    STP Series water heaters are thoroughly inspected and tested prior to shipment. Upon receipt of the STP Series water heater, please carefully inspect the entire unit and its components for any damages during shipping. If any evidence of damage is detected that could affect the safe operation of the unit, contact DHT or the authorized sales representative to report the damage and to receive instructions on how to proceed.

  • Page 12: Installation Clearances And Unit Dimensions

    SECTION 2: INSTALLATION INSTRUCTIONS 2.3 INSTALLATION CLEARANCES AND UNIT DIMENSIONS The STP Series minimum acceptable clearances are shown in Figure 2-1 and dimensions are shown in Figure 2-2. The minimum clearance dimensions are indicated in the drawings. However, if local building codes require additional clearances, the local building codes shall supersede these requirements.
  • Page 13 STP SERIES Install, Operation, and Maintenance Manual SECTION 2: INSTALLATION INSTRUCTIONS FIGURE 2-2: STP Series Dimensional Drawing Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 13 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 14: Unit Placement

    Refer to Section 2.5 Piping Installation and Unit Connections for piping and installation instructions. STP Series units must be installed to permit relief valve drain per local codes. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082...

  • Page 15: Piping Installation And Unit Connections

    SECTION 2: INSTALLATION INSTRUCTIONS 2.5 PIPING INSTALLATION AND UNIT CONNECTIONS STP Series units can be installed in various domestic water applications within the rated temperature and pressure conditions. Refer to Section 6.3 for appropriate Piping and Installation Drawings per your application requirements before making piping connections. CAD drawings are also available on the DHT website for layout specification.

  • Page 16: Electrical Connections

    All field wiring connections for power and controls are inside the control panel at the front of the STP Series water heater. The wiring label is attached to the inside aluminum door of the control box. An external electrical disconnect (not supplied with the water heater) with adequate overload protection is required.

  • Page 17: Water Quality

    6.8 for copper materials. NOTE: Consult DHT factory before using STP Series units for any other non-standard applications and in case of any additional information. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082...

  • Page 18: Operation And Controls

    Unit startup procedure instructions 3.2 STP SERIES FUNCTIONAL DESCRIPTION DHT’s STP Series units are engineered using boiler water as the heating medium. Heat exchangers are available in standard brazed plate double wall construction with both simplex and duplex configuration, depending upon customer requirement for larger capacity or built in redundancy.
  • Page 19 STP Series units can be used with both condensing and non-condensing boilers for combination space and domestic water heating.

  • Page 20: Brazed Plate Heat Exchanger Construction

    They are replaced at the effective end of service life. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 20 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 21: Plate Options

    See Figure 3-2 for an illustration of how a single wall and double wall differ in construction, and how both function in the event of a hole, allowing fluid to leak through a plate. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 21 of 97 PHONE: 800-221-1522 •...

  • Page 22: Safety Controls

    Control Valves are available, standard 2 inches NPT connections size in straight through 2-way operation and shown in Figure 3-3 below: FIGURE 3-3: Control Valve with 2” NPT Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 22 of 97 Rev-1 PHONE: 800-221-1522 •...

  • Page 23: Performance Data (Control Valve)

    The Control Valves are factory-calibrated at 0% and 100% stroke. When commissioning the valves (especially under extreme usage conditions), there may still be some leakage via control Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 23 of 97 PHONE: 800-221-1522 •...

  • Page 24: Auto And Manual Control Of Control Valve

    The valve position is measured continuously. The positioning controller ensures an exactly proportional relationship between the control signal and the valve stroke. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 24 of 97 Rev-1 PHONE: 800-221-1522 •...

  • Page 25: Controller Status Led Indication

    – Faulty 24 VAC supply (or low power) – No 24 VAC supply LED Off – Fault with electronics module Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 25 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 26: Variable Frequency Drive (Vfd) Pump Option

    FIGURE 3-8: VFD Pump with Flange Connections 3.6.1 Performance Data • STP Series water heaters include optional VFD pumps which are simple to install and easy interface • VFD pump modulates the flow of boiler/HTHW through the heat exchanger based upon the signal from the controller to maintain domestic temperature to target set point inside tank •...

  • Page 27: Operating Modes

    Cover can be rotated independent of the pump to adjust orientation of the user interface. ACCEPTABLE UNAUTHORIZED FIGURE 3-9: VFD Pump with Flange Connections Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 27 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual...

  • Page 28: Controller Status Led Indication And Error Codes

    Control reduces rpm to reduce heat. 8 blinks Staging Fault The LED will typically assume only the conditions in this table. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 28 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 29: Preparation Of Unit For Operation

    10) The unit is now ready for normal operation. Proceed to Section 3.11 for setting the temperature and other initial startup parameters using the controller. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 29 of 97 PHONE: 800-221-1522 •...

  • Page 30: Unit Shutdown Procedures

    7. After performing the required maintenance or repairs, return the unit to operation by following the startup procedures described above in Section 3.8. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 30 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 31 NOTE: Also refer to appropriate drawings in Section 6 for more installation instructions and other field installed component location details. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 31 of 97 PHONE: 800-221-1522 •...

  • Page 32: Controller Introduction

    This section shows the description of the main display on the front screen and menu functions of the controller of touchscreen user interface. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 32 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 33 USB memory drive kit is installed standard inside the control panel. Contact your DHT sales representative or DHT factory for more information about data logging Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 33 of 97 PHONE: 800-221-1522 •...

  • Page 34: Pid Controller Overview

    Page button is pressed within a list, the display reverts to the top of the list. The top of the list shows only the list header with no initial parameters. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 34 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 35 A time-out applies to all displays. If no button presses are detected within a timeout period (default is 30 min.), the display will revert back to the “HOME screen.” Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 35 of 97 PHONE: 800-221-1522 •...

  • Page 36: Controls Startup

    PID CONTROLLER LOCATION BEHIND THE FRONT DOOR Upon power up, the opening screen on touchscreen shows the DHT logo and then defaults to the display “HOME screen” below. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 36 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 37 Section 3.11. DEFAULT STP SERIES HOME SCREEN To program the controller for operation, follow the instructions in the following sections. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 37 of 97 PHONE: 800-221-1522 •...

  • Page 38: Programming Sequence

     DISPLAY SCREENS AND ADJUSTMENTS The STP Series default “HOME screen” as explained in Section 3.9.1. Factory default domestic hot water set point is 140°F. This screen shows the adjustable domestic water set point as well as currently measured domestic outlet temperature, domestic inlet water temperature and control valve output open percentage.
  • Page 39 Each unit is factory configured to display appropriate information on this screen. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 39 of 97 PHONE: 800-221-1522 •...
  • Page 40 If an error condition is detected, it displays error message(s) on the home screen as shown below, which require corrective action. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 40 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 41 2. If error condition still exists, contact sales representative or DHT technical support for more information. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 41 of 97 PHONE: 800-221-1522 •...

  • Page 42: Data Communications

    SECTION 3: OPERATION AND CONTROLS 3.13 DATA COMMUNICATIONS DHT STP Series Water heater control system allows the controller to communicate with external Building Automation System (BAS) or Energy Management System (EMS). It is compatible with standard Modbus RTU or TCP/IP and BACnet UDP/IP multi-protocols without the need for external gateway.

  • Page 43: Dht Controller Communication Features

    Default Data Length: 8 d. Default Stop Bits: 1 e. Default Slave ID: 1 Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 43 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 44: Modbus Rtu Communication Wiring

    Up to 32 units can be connected in a daisy chain network including BAS Master. Single unit wiring: Multiple units’ daisy-chain wiring: Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 44 of 97 Rev-1 PHONE: 800-221-1522 •...

  • Page 45: Modbus/Bacnet Data Addresses And Points

    1. Modbus decimal address is offset from 400001. 2. Abbreviations: RO – Read Only RW – Read/Write Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 45 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 46: Instructions To Change Communication Settings Manually

    2. Press and hold page button on the main screen until following screen appears: Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 46 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 47 The default passcode is 0004. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 47 of 97 PHONE: 800-221-1522 •...
  • Page 48 9. Click on page button until “COmm” appears on the screen: Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 48 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 49 Use the raise and/or lower arrow buttons to change the parameters. Jump to step 23 in order to save the settings. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 49 of 97 PHONE: 800-221-1522 •...
  • Page 50 – IP, Gateway, Subnet masks shall be manually setup is DHCP mode – DHCP server shall be setup to assign IP, etc. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 50 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 51 20. After setup, click until you see: 21. Click arrow button until you see the screen below for BACnet setting Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 51 of 97 PHONE: 800-221-1522 •...
  • Page 52 25. Now the controller is ready for normal operation. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 52 of 97 Rev-1 PHONE: 800-221-1522 •...

  • Page 53: Dry Contacts

    (between contacts 11 and 12 and 21 and 22). Normally open (NO) contacts are rated for 8 amps and maximum switching voltage is 400 VAC. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 53 of 97 PHONE: 800-221-1522 •...

  • Page 54: Maintenance

    SECTION 4: MAINTENANCE SECTION 4: MAINTENANCE CAUTION! All service on the STP Series water heaters must be performed by trained and experienced technicians from appropriate service agencies. This section covers the service and maintenance for STP Series water heaters and provides instructions for the inspection and replacement of critical parts and components.

  • Page 55: Circulating Pump Maintenance

    SECTION 4: MAINTENANCE 4.1 CIRCULATING PUMP MAINTENANCE DHT STP Series water heaters are equipped with circulating pump(s) to assist in the even heating of the water. If the unit is equipped with a circulating pump, the following procedure should be followed to replace the pump.

  • Page 56: Power Connection Rewiring

    3) Turn the power on to check that the component that has been rewired is functioning properly. 4) Follow the startup procedure instructions in Section 3.7 of this manual to return the unit to operation. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 56 of 97 Rev-1 PHONE: 800-221-1522 •...

  • Page 57: Heat Exchanger Maintenance

    STP SERIES Install, Operation, and Maintenance Manual SECTION 4: MAINTENANCE 4.3 HEAT EXCHANGER MAINTENANCE This section describes how to clean and maintain the STP Series heat exchangers, including inspection instructions. Brazed Plate type of heat exchangers cannot be disassembled for plate replacement, so maintenance is necessarily limited to CIP cleaning or replacement of the entire heat exchanger module when it has reached the end of its lifetime.
  • Page 58 PORTS FIGURE 4-1: CIP Port Connection Locations NOTE: Boiler water side CIP connections are field provided. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 58 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019...

  • Page 59: Brazed Plate Heat Exchanger Module Replacement

    9. Unit should be checked for leaks and correct pressure levels to ensure proper operation. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 59 of 97 PHONE: 800-221-1522 •...

  • Page 60: T&P Or Adjustable Relief Valve Replacement

    T&P RELIEF VALVE ADJUSTABLE RELIEF VALVE FIGURE 4-4: T&P or Adjustable Relief Valve Installation Locations Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 60 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 61: Boiler Water Control Valve Option Maintenance

    3-WAY CONTROL VALVE HEAT EXCHANGER FIGURE 4-5: 3-Way Control Valve Component Locations Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 61 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual 09/11/2019...
  • Page 62 Blanking disks are not available for the large flange models. PORT B BLANKING DISK GASKET FIGURE 4-6: 3-Way Control Valve NPT Connection Components Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 62 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019...

  • Page 63: Boiler Water Vfd Pump Option Maintenance

    4.6 BOILER WATER VFD PUMP OPTION MAINTENANCE DHT STP Series water heaters are equipped with optional heating source boiler water VFD pump(s) to assist in the even heating of the water in lieu of Control Valve(s) depending upon customer preference.

  • Page 64: Temperature Controller

    • Anodes(s) for carbon steel tank option NOTE: Refer to Sections 4.12 and 4.13 for complete replacement part number information. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 64 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 65: Recommended Spare Parts

    SEC 4.12 4.10 ORDERING INFORMATION All replacement parts for DHT STP Series units can be ordered directly from your local authorized sales representative/agent. Visit Rep Locator page on DHT website if needed to find your local sales rep contact information.

  • Page 66: Inspection Schedule

    Power and Ground Connections Relief Valves Isolation and Check Valves Strainers Control Panel and Thermocouples Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 66 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 67: Parts And Accessories

    FLAT WASHER – 1/4” – TYPE A MHRD-01B-0006 FLANGED LOCK NUT - 1/4”-20 - UNC 2B Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 67 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 68 POWER ANODE KIT *Quantity vary depending upon unit capacity requirement **Item number 18 (not shown here) and used with large heat exchangers Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 68 of 97 Rev-1 PHONE: 800-221-1522 •...
  • Page 69 2 - DUPLEX HEAT EXCHANGER – B35TDWM4X174 80002-174 HEAT EXCHANGER – B35TDWM4X222 80002-222 Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 69 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual...
  • Page 70 1 - SIMPLEX 70006 1.50” SIZE STRAIGHT PIPE 2 - DUPLEX MFIT-5-S-2-2052 REDUCING VICTAULIC COUPLING Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 70 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 71: Control Box Parts

    STP SERIES Install, Operation, and Maintenance Manual SECTION 4: MAINTENANCE 4.13 CONTROL BOX PARTS Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 71 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual...
  • Page 72 MELE-19-0030 2 or 3 2 POLE RELAY SWITCH KIT 65001 2 or 3 RELAY COIL ONLY Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 72 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019...
  • Page 73 MELE-19-0029 BACK PANEL 65004 USB MEMORY STICK 65005 USB ADAPTER, RIGHT ANGLE Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 73 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual 09/11/2019...
  • Page 74 STP SERIES Install, Operation, and Maintenance Manual SECTION 4: MAINTENANCE This page is intentionally left blank Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 74 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019...

  • Page 75: Troubleshooting

    SECTION 5: TROUBLESHOOTING The following table summarizes problems that may be encountered over the life of a DHT STP Series unit, and the procedures to remedy those problems. The left-hand column lists the symptoms. The remaining columns are suggested procedures or “remedies” that should be followed to identify and correct the problem.
  • Page 76 Section 3.12 for the specific temperature control properly. system installed on the unit. Also, check to ensure that the Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 76 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 77 6. Check and readjust as necessary. Replace the defective parts as controller or Aquastat not properly set or necessary. Refer to adjustment instructions contained in Section Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 77 of 97 PHONE: 800-221-1522 •...
  • Page 78 3. Recalibrate the Control valve or VFD pump per instructions in condition. calibration. Section 3.5 or 3.6. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 78 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 79 Replace the ON/OFF switch on the control is OFF. failed/OFF. panel if faulty. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 79 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 80: Technical Drawings & Forms

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS SECTION 6: TECHNICAL DRAWINGS & FORMS 6.1 DIMENSIONAL DRAWINGS Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 80 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 81: Clearance Drawings

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS 6.2 CLEARANCE DRAWINGS Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 81 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...

  • Page 82: Piping And Installation Drawings

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS 6.3 PIPING AND INSTALLATION DRAWINGS Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 82 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 83 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 83 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual...

  • Page 84: Electrical Wiring Diagrams/Schematics

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS 6.4 ELECTRICAL WIRING DIAGRAMS/SCHEMATICS Control Box Internal Electrical Wiring Diagram: Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 84 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 85 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS AND FORMS Terminal Block Wiring Connections: Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 85 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 86 National or local electrical codes supersede the instructions. • Also follow instructions in pump manufacturer manual shipped with the unit. Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 86 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 87 Install external electrical disconnect complying with electrical codes. • National or local electrical codes supersede the instructions. Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 87 of 97 PHONE: 800-221-1522 •...

  • Page 88: Forms And Records

    UNIT TEXT SECONDARY ALARM OFF AT SCALING DECIMAL POINT ANALOG INPUT LOW ANALOG INPUT HIGH Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 88 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 89: Stp Series Installation Form

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS 6.5.2 STP Series Installation Form Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 89 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 90 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 90 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...
  • Page 91 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 91 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual...
  • Page 92 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 92 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 93: Stp Series Startup Form

    STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS 6.5.3 STP Series Startup Form Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 93 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com...
  • Page 94 STP SERIES Install, Operation, and Maintenance Manual SECTION 6: TECHNICAL DRAWINGS & FORMS Diversified Heat Transfer, Inc. • 439 Main Road • Towaco, New Jersey 07082 Page 94 of 97 Rev-1 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com 09/11/2019 STP Manual...

  • Page 95: Warranty

    Water Heater must be operated in accordance with the conditions stated herein, against the indicated failures. The STP SERIES Warranty commences on the date of shipment or if a start-up report is furnished to Seller, on the start-up date shown on the report furnished to Seller (the “Warranty Period”).
  • Page 96 K. Costs associated with the replacement and/or repair of the unit including: any freight, shipping or delivery charges, any removal, installation or reinstallation charges, any material and/or permits required for installation, reinstallation or repair, charges to return the STP SERIES Water Heater or components;...
  • Page 97 Maintenance Manual Change Log: Date Description Changed By 09/11/2019 Initial release www.dhtnet.com Diversified Heat Transfer, Inc. • 439 Main Road, Route 202 • Towaco, New Jersey 07082 Rev-1 Page 97 of 97 PHONE: 800-221-1522 • WEBSITE: www.dhtnet.com STP Manual 09/11/2019...

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