
STP SERIES Install, Operation, and Maintenance Manual
TABLE OF CONTENTS
Page 2of 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
TABLE OF CONTENTS:
SECTION 1: GENERAL INFORMATION....................................................................................................4
1.1 INTRODUCTION...........................................................................................................................................4
1.2 DESCRIPTION..............................................................................................................................................4
1.3 FEATURES 5
1.4 APPLICATIONS.............................................................................................................................................5
1.5 ENERGY SOURCES.....................................................................................................................................5
1.6 DESIGN CONDITIONS .................................................................................................................................6
1.7 CONSTRUCTION..........................................................................................................................................6
1.8 SAFETY 7
1.8.1 Operating Precautions............................................................................................................................................. 7
1.8.2 Storage and Transportation..................................................................................................................................... 7
1.8.3 Safety Features........................................................................................................................................................ 7
1.8.4 Safety Notation........................................................................................................................................................ 8
1.8.5 Proper Training ........................................................................................................................................................ 8
1.8.6 Safety Precautions................................................................................................................................................... 8
SECTION 2: INSTALLATION INSTRUCTIONS .......................................................................................10
2.1 RECEIVING, HANDLING, AND STORAGE................................................................................................10
2.1.1 Examining the Unit ................................................................................................................................................ 11
2.1.2 Compliance with Codes ......................................................................................................................................... 11
2.2 SITE PREPARATION..................................................................................................................................11
2.3 INSTALLATION CLEARANCES AND UNIT DIMENSIONS........................................................................12
2.4 UNIT PLACEMENT .....................................................................................................................................14
2.5 PIPING INSTALLATION AND UNIT CONNECTIONS................................................................................15
2.6 ELECTRICAL CONNECTIONS...................................................................................................................16
2.7 WATER QUALITY .......................................................................................................................................17
SECTION 3: OPERATION AND CONTROLS...........................................................................................18
3.1 INTRODUCTION.........................................................................................................................................18
3.2 STP SERIES FUNCTIONAL DESCRIPTION..............................................................................................18
3.2.1 Brazed Plate Heat Exchanger Construction ........................................................................................................... 20
3.3 PLATE OPTIONS .......................................................................................................................................21
3.3.1 Double Wall Construction and Protection Performance....................................................................................... 21
3.4 SAFETY CONTROLS.................................................................................................................................22
3.5 CONTROL VALVE OPTION........................................................................................................................22
3.5.1 Performance Data (Control Valve) ........................................................................................................................ 23
3.5.2 Calibration Instructions (Control Valve) ................................................................................................................ 23
3.5.3 Auto and Manual Control of Control Valve ........................................................................................................... 24
3.5.4 Controller Status LED Indication............................................................................................................................ 25
3.6 VARIABLE FREQUENCY DRIVE (VFD) PUMP OPTION ..........................................................................26
3.6.1 Performance Data.................................................................................................................................................. 26
3.6.2 Operating modes ................................................................................................................................................... 27
3.6.3 Pump Installation................................................................................................................................................... 27
3.6.4 Controller Status LED Indication and Error Codes................................................................................................. 28
3.7 PREPARATION OF UNIT FOR OPERATION.............................................................................................29
3.8 UNIT STARTUP PROCEDURES................................................................................................................29
3.9 UNIT SHUTDOWN PROCEDURES............................................................................................................30
3.10 CONTROLLER INTRODUCTION .............................................................................................................32