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Table of Contents
Related Manuals for Precision HWST
Summary of Contents for Precision HWST
- Page 1 Installation and Operating Instructions ELECTRIC HOT WATER & STEAM BOILERS...
- Page 2 Read this manual thoroughly and follow the instructions herein. The PRECISION Boilers shall be installed according to the procedures detailed in this manual, or the Precision Boilers Limited Warranty may be voided. The installation must conform to the requirements of the local jurisdiction having authority, and to the latest edition of the National Fuel Gas Code, ANSI Z223.1.
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Page 3: Table Of Contents
TABLE OF CONTENTS 1.0 GENERAL INFORMATION 6.1 Activation of Heating Element Circuits ... 10 1.1 Introduction ............4 6.1.1 Contactors ........... 10 1.2 Local Regulations ..........4 6.1.2 Fuses ............10 1.3 Recommendations ..........4 6.2 Sequencing Controls ........10 1.3.1 Preventative Maintenance...... -
Page 4: General Information
1.0 GENERAL INFORMATION 1.1 Introduction PRECISION has made a commitment to product improvement and follows a continuing quest for the highest standards of product performance. In pursuing this policy of continuous development of products, the manufacturer reserves the right to vary any details in this manual without notice. -
Page 5: Uncrating
2.3 Uncrating 2.3.1 Care must be taken not to damage controls or deform the boiler sheet metal during removal of the crate. 2.3.2 If using pry bars or fork lifts, be certain to support the boiler weight by the skids or channel base. 2.4 Placement CAUTION: If the equipment is to be placed in a room with little or no ventilation, a supply of ducted filtered air may have to be brought to the lower portion of the control cabinet to limit the control cabinet interior... -
Page 6: Electrical Connections
3.1.2 Install the safety relief valve(s) on the pipes provided. Plumb the relief valve outlet connections full size to the floor drain. Check local codes for proper safety valve discharge for steam boilers above 15 psi, which normally are required to be piped to overhead discharge outside safely away from personnel. -
Page 7: Pre-Startup Inspection
4.0 PRE-STARTUP INSPECTION 4.1 Minimum Equipment Required For Startup And Troubleshooting Volt-Ohn Meter Clamp-On Ammeter Megohm Meter Torque Wrench – inch lbs Torque Wrench – foot lbs 4.2 Mechanical System Checks 4.2.1 Plumbing Connections Completed Inlet / Makeup water? Discharge / Outlet? Drain / Blowdown? Relief / Safety Valve discharge? 4.2.2 Feedpumps / Circulating Pumps... -
Page 8: Heating Elements
□ With an ohmmeter, check the resistance between the phases on the load side of the contactors. Each should read the same and approximately what is shown on the wiring diagram. □ Check the electrical panels for loose material, dust and / or moisture. Thoroughly vacuum the panels if dust or foreign materials have accumulated there If there has been severe exposure to dust, the contactors should be disassembled and cleaned. -
Page 9: High Limit
NOTE: (For Water Heaters) The maximum water temperature for lined vessels is 160°F, except for cement lined vessels which can operate at 180° F. NOTE: (For Hot Water Boiler) Outdoor reset (dual bulb) controllers are set at the temperature at which the Boiler should operate when the outdoor temperature is 70°F (this outdoor reference temperature is adjustable on most solid state controls;... -
Page 10: Sequence Of Operation
5.2.7.3 With the step control board full on, individually enable each step. The respective pilot light should light and the contactor(s) applying power to the respective elements. 5.2.7.4 For units with ON/OFF/PREHEAT switches, only part (approximately 25% may be activated when the switch is down in the ‘PREHEAT’... -
Page 11: Recycle Feature
6.2.3 Recycle Feature All step controls now incorporate the recycle feature which returns the step control to the no-load condition upon loss of control power 6.2.4 Manual Step ‘ENABLE / DISABLE’ Toggle Switches All units with >1 step now include manual ‘ENABLE / DISABLE’ toggle switches to provide a positive ‘OFF’ override of each step. -
Page 12: Solid State Dual Reset Controls
7.2.1.3 Then set the controller at this resultant temperature; the step controller should maintain nominally half of the steps on. Setting the OUTDOOR RESET CONTROLLERS basic information is shown in Table 1 below Table 1 SETTING THE TEMPERATURE CONTROLLER Reset Ratio: 1:1-1/2 (IE: 2/3:1) Outdoor Temperature: 40°F... -
Page 13: Water Treatment
8.4.7 Steam Boiler Special Maintenance 8.4.7.1 All PRECISION steam boilers are supplied with a surface blow-off connection. If surface blowoff valves are not Factory-installed, they should be installed in the field. The surface blow-off should be used as often as necessary to remove organics which accumulate at the water surface, and to limit TDS. -
Page 14: Element Replacement Procedure
Water treatment is required for satisfactory operation of steam boilers to prevent both deposition of scale and corrosion from acids, oxygen and other harmful elements that may be in the water supply. A qualified water treatment specialist should be consulted to establish a proper water treatment program 8.5 Element Replacement Procedure (4-Bolt Style Element) CAUTION: Before element replacement, make certain main power to the unit is turned off, that there is no pressure in the unit, and that the unit is drained below the element opening.