Vulcan-Hart MHB24E Manuals

A product of VULCAN-HART LOUISVILLE, KY 40201-0696 F25154 (February 2004) - NOTICE - This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. If you have attended a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this manual. This manual is not intended to be all encompassing. If you have not attended a Vulcan Service School for this product, you should read, in its entirety, the repair procedure you wish to perform to determine if you have the necessary tools, instruments and skills required to perform the procedure. Procedures for which you do not have the necessary tools, instruments and skills should be performed by a trained Vulcan Service Technician. Reproduction or other use of this Manual, without the express written consent of Vulcan, is prohibited. VHX24E SHOWN SERVICE MANUAL VHX BOILER BASE SERIES HIGH EFFICIENCY ELECTRIC STEAMER VHX24E ML-126852 VHX24E5 ML-126853 MHB24E ML-126857 (BASE ONLY) For additional information on Vulcan-Hart or to locate an authorized parts and service provider in your area, visit our website at www.vulcanhart.com. VHX SERIES STEAMERS F25154 (February 2004) Page 2 of 48 TABLE OF CONTENTS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Installation, Operation and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Steam Cooking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Model Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Compartment Pan Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Cooking Compartments Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Boiler Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Boiler Code Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Water Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Boiler Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 REMOVAL AND REPLACEMENT OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pressure Switch Control Box Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Main Control Box Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Water Level Gauge Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Heating Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Heating Element Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Boiler Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Descaler (Cathodic Protector) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Cooking Compartment Door(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SERVICE PROCEDURES AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Clean-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Deliming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Descaler (Cathodic Protector) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Water Level Probe Housing Blowdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Water Level Controls Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Cycling Pressure Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 High Limit Pressure Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Boiler Fill and Cold Water Condenser Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Cold Water Condenser Thermostat Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Heating Element Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Cooking Compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Intake Shut-Off Valve Adjustment (Steam Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Door Sealing Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Door Latch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 VHX SERIES STEAMERS F25154 (February 2004) Page 3 of 48 ELECTRICAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Cabinet Base Boiler Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Cooking Compartment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Boiler Base Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Cooking Compartment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Water Level Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Low Level Cut-Off & Differential Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Auxiliary Low Level Cut-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Layout, Legend & Diagnostic Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Cooking Compartment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Boiler Base Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Cooking Compartment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Boiler Base Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Heating Element Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Cooking Compartment Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 CONDENSED SPARE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 © VULCAN 2004 VHX SERIES STEAMERS - GENERAL F25154 (February 2004) Page 4 of 48 GENERAL INSTALLATION, OPERATION AND CLEANING Refer to the Installation and Operation Manual for specific instructions. INTRODUCTION Steam Cooking Convection cooking in pressure-less steaming compartments will steam cook fresh foods or will steam defrost and cook frozen foods providing the maximum color, flavor and nutritional value with the least expenditure of energy and labor. The pressure- less steaming compartments on the VHX series, allows the operator to open and close the door anytime during a cooking cycle. The steam supply will shut off when the door is opened, then re-start when the door is closed. Model Designations Compartment Pan Capacity MODEL NUMBER OF PANS PER COMPARTMENT PAN DEPTH (INCHES) VHX24E 2 4.0 3 2.5 6 1.0 VHX24E5 3 4.0 5 2.5 10 1.0 Pan Size 12" x 20" Cooking Compartments Control Panel Boiler Control Panel

For additional information on Vulcan-Hart or to locate an authorized parts and service provider in your area, visit our website at www.vulcanhart.com Model VHX24E Model MHB24G Model VHL2G VULCAN-HART P.O. BOX 696, LOUISVILLE, KY 40201-0696 DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC TEL. (502) 778-2791 WWW.VULCANHART.COM FORM 35419 (Dec. 2004) INSTALLATION & OPERATION MANUAL VHX24, VHL2, VHL3 & VH3616 SERIES FOOD STEAMERS & MHB24 SERIES STEAM GENERATORS MODELS VHX24E ML-136033 VHX24E5 ML-136034 VHX24G ML-136031 VHX24G5 ML-136032 VHX24D ML-136035 VHX24D5 ML-136036 VHL2G ML-126323 VHL3G ML-126324 VHL2E ML-126855 VHL3E ML-126856 VHL2D ML-126858 VHL3D ML-126859 MHB24E ML-126857 MHB24G ML-114954 VH3616G ML-136000 VH3616E ML-136001 VH3616D ML-136002 – 2 – IMPORTANT FOR YOUR SAFETY THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GAS EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD START-UP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL. POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE EVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION CAN BE OBTAINED FROM THE LOCAL GAS SUPPLIER. IMPORTANT IN THE EVENT A GAS ODOR IS DETECTED, SHUT DOWN UNITS AT MAIN SHUTOFF VALVE AND CONTACT THE LOCAL GAS COMPANY OR GAS SUPPLIER FOR SERVICE. FOR YOUR SAFETY DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE. WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. READ THE INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR SERVICING THIS EQUIPMENT. IN THE EVENT OF A POWER FAILURE, DO NOT ATTEMPT TO OPERATE THIS DEVICE. © VULCAN-HART, 2004 – 3 – TABLE OF CONTENTS GENERAL 5 INSTALLATION 5 Unpacking 5 Installation Codes and Standards 5 Leveling — All Steamers & Steam Generators 6 Plumbing Connections — All Steamers & Steam Generators 6 Water Supply Connection 6 Water Requirements 6 Drain Connection 6 Location — Gas Powered Steamers & Steam Generators 7 Gas Supply Connection 7 Testing the Gas Supply System 8 Flue Gas Exhaust 8 Electrical Connection — Gas Steamers & Steam Generators 8 Location — Electric Steamers & Steam Generators 9 Electrical Connection 9 Connection of Other Steam Cooking Equipment to an Electric or Gas Boiler 10 Sequential Startup of Other Steam Cooking Equipment Connected to a Boiler 10 Location — Direct Connected Steamers 10 Direct Steam Connections 10 Startup Test Run — VHX24 & VH3616 Series Steamers 11 Startup Test Run — VHL2 & VHL3 Series Steamers 12 OPERATION 14 Boiler Controls — Gas or Electric 14 Gas Boiler 15 Electric Boiler 15 Compartment Controls — VHX24 & VH3616 Series Steamers 16 Preheating 16 Operating VHX24 & VH3616 Series Steamers 17 Extended Shutdown 17 – 4 – Standard Automatic Compartment Controls — VHL2 & VHL3 Steamers 18 Preheating 18 Operating VHL2 & VHL3 Steamers with Standard Automatic Compartment Controls 19 Pre-Vent Compartment Controls — VHL2 & VHL3 Steamers 20 Operating VHL2 & VHL3 with Pre-Vent Compartment Controls 21 Selection of Pans for Steam Cooking in VHL2 & VHL3 Steamers 22 Cooking Hints 23 Suggested Cooking Guidelines 23 Cleaning 26 Cooking Compartment Drains 26 Boiler Blowdown 26 Compartments 26 Door Gaskets 26 Leave Compartment Doors Open 26 Guidelines for Maintaining Stainless Steel Surfaces 27 MAINTENANCE 28 Water Treatment System 28 Boiler Blowdown 28 Boiler Pressure Relief Valve 28 Door Gaskets — VHX24, VHL2 & VHL3 Series Steamers 28 Water Level Gauge 28 Flue 28 Inspection of Boiler Interior 28 Scale Related Maintenance (Gas & Electric Boilers) 29 Probe Housing Blowdown Valve (Gas & Electric Boilers) 29 Lubrication — VHL Series 29 TROUBLESHOOTING 30 Service and Parts Information 30

CATALOG OF REPLACEMENT PARTS MODELS VHX24G ML-114795 VHX24G5 ML-126590 VHL2G ML-126323 VHL3G ML-126324 MHB24G ML-114954 VHX24E ML-126852 VHX24E5 ML-126853 BOILER BASE STEAMER VULCAN-HART COMPANY, P.O. BOX 696, LOUISVILLE, KY 40201-0696, TEL. (502) 778-2791 FORM 31218 (November 2003) For additional information on Vulcan-Hart Company or to locate an authorized parts and service provider in your area, visit our website at www.vulcanhart.com VHL2E ML-126855 VHL3E ML-126856 MHB24E ML-126857 VHX24D ML-126862 VHX24D5 ML-126863 VHL2D ML-126858 VHL3D ML-126859 - 2 - VHX/VHL/MHB SERIES BOILER BASE STEAMER REPLACEMENT PARTS F-31218 (November 2003) © VULCAN-HART COMPANY - 3 - VHX/VHL/MHB SERIES BOILER BASE STEAMER REPLACEMENT PARTS F-31218 (November 2003) Table of Contents Page Description 5 Flue Assembly (VHX and VHL Gas Units) 7 Boiler Pressure Switch Assembly (VHX, VHL, and MHB Gas and Electric) 9 Burner Assembly (VHX, VHL, and MHB Gas Units) 11 Boiler Control Panel (VHX, VHL, and MHB Gas and Electric) 13 Main Control Box – Gas (VHX, VHL, and MHB Gas Units) 15 Main Control Box (VHX, VHL, and MHB Electric Units) 17 Gas Plumbing Assembly (VHX, VHL, and MHB Gas Units) 19 Boiler Assembly (VHX, VHL, and MHB Gas Units) 21 Boiler Plumbing Components 23 VHX Series Pressureless Cooker (6 Pan Unit) 25 VHX Series Pressureless Cooker (10 Pan Unit) 27 VHL Series Steamer Compartment Door 29 VHL Series Control Panel – Auto Deluxe, Pre-Vent Controls 31 VHL Series Compartment Controls – Manual 33 VHL Series Compartment Controls – Standard Auto 35 VHL Series Compartment Controls – Pre-Vent 37 Field Terminal Box (Electric Units) 39 Condensor Box 41 Water Inlet Plumbing 43 Steam Header - 4 - VHX/VHL/MHB SERIES BOILER BASE STEAMER REPLACEMENT PARTS F-31218 (November 2003) FLUE ASSEMBLY (VHX AND VHL GAS UNITS) 1 2 PL-56383 3 4 5 6

Item # __________________________ C.S.I. Section 11420 VULCAN-HART COMPANY, P.O. BOX 696, LOUISVILLE, KY 40201, TEL. 1-800-814-2028 502-778-2791 QUOTE & ORDER FAX: 1-800-444-0602 ISO9001 Vulcan-Hart Co. F-32574 (8-04) MODEL MHB24E MODULAR ELECTRIC BOILER WITH ENCLOSED BASE MODELS: MHB24E Modular Electric Boiler with Enclosed Base STANDARD FEATURES ■Cabinet with stainless steel frame, front full height doors, slip-off stainless steel side and aluminized rear panel with 6" adjustable legs with flanged feet for anchoring. ■24 KW electric steam boiler builds 2.3 BHP. Includes CSD-1 compliant high pressure limit switch (15 psi), low water cut-off, automatic water fill, automatic generator blowdown, 15 psi pressure relief valve and 15 psi kettle connection. ■Service connections include 1/2" cold water connection for boiler feed, 1/8" cold water condenser and 11/4" drain connec- tion. (See detail on back page.) ■One year limited parts and labor warranty. OPTIONS ■Correction facility package: - Cabinet door with hasp (lock by others). - Control cover (lock by others). - Tamper resistant fasteners. - Flue riser cover. ■36 KW, 208 or 240 volt, 60 Hz, 3 phase. ■42 KW, 208, 60 Hz, 3 phase. ■48 KW, 240 volt, 60 Hz, 3 phase. ■Mount and interconnect boiler base with kettle at factory. Includes steam supply piping. Shipped on one skid. ■Second year extended limited parts and labor warranty. ACCESSORIES ■Stainless steel back panel. ■Interconnecting steam supply plumbing kit. ■Water treatment system. SPECIFICATIONS: Modular electric boiler, Vulcan-Hart Model No. MHB24E. Cabinet with stainless steel frame, front full height doors, slip-off stainless steel side and aluminized rear panel with 6" adjustable legs with flanged feet for anchoring. 24 KW steam boiler builds 2.3 BHP. Includes CSD-1 compliant high pressure limit switch (15 psi), low water cut-off, automatic water fill, automatic generator blowdown, 15 psi pressure relief valve and 15 psi kettle connection. Stainless steel cover flue. Service connec- tions include 1/2" cold water connection for boiler feed , 1/8" cold water condenser and 11/4" drain connection. Exterior dimensions: 24"w x 35.4"d x 41.5"h. U L listed. U L listed to Canadian safety standards. Classified by U L to NSF Std. #4. Meets ASME code. SPECIFY TYPE OF GAS WHEN ORDERING. SPECIFY ALTITUDE WHEN ABOVE 2,000 FT. Printed On Recycled Paper VULCAN-HART COMPANY, P.O. BOX 696, LOUISVILLE, KY 40201, TEL. 1-800-814-2028 502-778-2791 QUOTE & ORDER FAX: 1-800-444-0602 NOTE: In line with its policy to continually improve its products, Vulcan-Hart Company reserves the right to change materials and specifications without notice. F-32574 (8-04) MODEL MHB24E MODULAR ELECTRIC BOILER WITH ENCLOSED BASE SERVICE CONNECTIONS: ELECTRICAL CONNECTION: Junction box for electrical con- nection for boiler heat and controls. DRAIN: Condenser box, compartment and boiler, 11/2" NPT. (Provide an open air type drain within 12" of condenser box and for best results at a distance so that steam vapors will not enter the steamer from underneath the control area. Do not connect solidly to any drain connections.) COLD WATER CONNECTION: 1/2" NPT for boiler feed. Inlet water pressure between 20 and 80 psi. COLD WATER CONNECTION: 1/2" NPT for condensate box. Inlet water pressure between 20 and 80 psi. WATER: For swing faucet, (single) (dual) temperature, 1/4" IPS tailpiece. STEAM TAKE-OFF CONNECTION: 3/4" NPT. WATER QUALITY STATEMENT: The fact that a water supply is potable is no guarantee that it is suitable for steam generation. Your water supply must be within these general guidelines: SUPPLY PRESSURE 20 - 60 psig HARDNESS* less than 3 grains SILICA less than 13 ppm TOTAL CHLORIDE less than 4.0 ppm pH RANGE 7-8 UN-DISSOLVED SOLIDS less than 5 microns * 17.1 ppm = 1 grain of hardness Other factors affecting steam generation are iron content, amount of chloridation and dissolved gases. Water supplies vary from state to state and from locations within a state. Therefore it is necessary that the local water treatment specialist be consulted before the installation of any steam generating equipment. NOTE: • Dimensions which locate the above connections have a tolerance of + or -3" (+ or -75 mm). • Installation of backflow preventers, vacuum breakers and other specific code requirements is the responsibility of the owner and installer. It is the responsibility of the owner and installer to comply with local codes. • Plastic drains are not recommended due to inherent limited tempera- tures of the plastic. Boiler purge temperatures may exceed 180°F. The installer may be required to provide means to reduce boiler purge water temperature to be that of the condensate temperature of 140°F or less. • This appliance is manufactured for commercial installation only and is not intended for home use. IMPORTANT: Total NOMINAL AMPS PER LINE Conn. Three Phase Single Phase KW 208 240 480 380/50/60, 4 wire 208 240 24 66.0 58 29 31 116 100 36 99.9 86.6 43.3 46 N/A N/A 42 118 N/A N/A N/A N/A N/A 48 N/A 116 58 62 N/A N/A