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SERVICE HANDBOOK
®
SandBlaster
Self-Cleaning Induced Draft Multi Flue
Commercial Gas Water Heaters
MOD E L S COVER E D
SBN71 120 Through SBN85 390 (A)
Series 108 Models and
SBD30 150, SBD30 199
Booster Heaters
SBN Meets Low NOx Requirements of SCAQMD
Rules 1121 & 1146.2
Part Number 317927-000
COMMERCIAL
Printed in the U.S.A. - 0810
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK Table of Contents SBN 71-120 thru 85-390, SBD30-150/199 SERVICE HANDBOOK INTRODUCTION.........2 QUALIFICATIONS..................................................................................................................3 TOOLS REQUIRED...............................................................................................................3 COMMERCIAL TANK TYPE GAS MODEL NUMBER BREAK DOWN......
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK WATER HEATER CONTROL BOARD TROUBLESHOOTING AND DIAGNOSTIC LED INTERPRETATION.............................................................................................................................33 WATER HEATER CONTROL BOARD TROUBLESHOOTING AND DIAGNOSTIC LED INTERPRETATION.............................................................................................................................3
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK QUALIFICATIONS Installation or service of this water heater requires ability equivalent to that of a licensed tradesman in the field involved. Plumbing, air supply, venting, gas supply and electrical testing skills are required. TOOLS REQUIRED • Phillips head screwdriver • standard screwdrivers • 3/8 and 7/16 inch open end wrench • set of marked drill bits • electrical multimeter tester capable of measuri
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK INSTALLATION CONSIDERATIONS - CLEARANCES This portion of the handbook reviews some often overlooked installation considerations clearances, air supply, gas pressure requirements, and venting—taking note of necessary installation requirements for SBN and SBD30-150/199 . The installation manual covers most of these items in detail. A 24-inch clearance for all serviceable parts is recommended. Clearances may
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK MINIMUM CLEARANCE TO COMBUSTIBLES Model Number "A" Right Side "B" Left Side "C" Back "D" Ceiling SBN-120 thru 2" 2" 2" 12" 200A SBN-250/A thru 3" 3" 3" 12" 310/A SBN-366 6" 6" 6" 6" SBN-390 4" 4" 4" 4" SBD30-150/199 2” 2” 2” 12” A, B, and C clearances to non-combustibles is “0” inches - a 12 inch clearance to cover remains unchanged. State Water Heaters 5 Technical Training Department Ashland City,
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK REQUIRED EXTERIOR CLEARANCES The illustration below shows the required clearances for venting units using natural draft venting. The vent must extend at least 3 feet above the highest point where it passes through a roof of a building and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (for vents of 12 inches in diameter or less). References: NFPA 54 2006; ANS
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK REQUIRED EXTERIOR CLEARANCES Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1,000 BTUH of gas supplied. The National Fuel Gas code also recommends an additional 2.5 cubic feet of “excess” air. For information on minimum make-up air opening sizes for various building installations, refer to the National Fuel Gas Code NFPA 54, ANSI Z223.1, Sec. 5.3 INSUFFICIENT MAKEUP AI
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK MAKE-UP AIR – DIRECT COMMUNICATION WITH OUTDOORS A fresh supply of make-up air for combustion can be supplied to the heater through make-up air ducts, which directly communicate with the outdoors.(Not Direct Vent) 1 SQUARE INCH PER 4,000 Btu FOR EACH OPENING Two openings are required: one within 12 inches of the top of the enclosure and one within 12 inches of the bottom of the enclosure. Each opening mu
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK CONTAMINATED AIR Along with adequate make-up air, the quality of the air is important. Contaminants in combustion air can lead to premature heater failure. Vapors from bleaches, soaps, waxes, salts, etc. are drawn into the combustion chamber with the make-up air and, once fired, mix with water vapor in the gases to form extremely corrosive hydrochloric or hydrofluoric acid and other corrosive by-products.
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK GAS VALVE The supply gas pressure is normally measured at the gas valve inlet gas pressure tap, if available, when the gas is flowing. The manifold gas pressure is measured at the manifold pressure tap of the gas valve when the gas is flowing. Gas valves used are 24 volt AC combination-step opening gas valves. They incorporate the main valve and gas pressure regulator into one body. The Low Gas Pressure S
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK GAS VALVE The outlet view of the Gas Valve, shown on the right, shows the Manifold Gas Outlet Connection, the two 24 volt Main Valve (MV) Solenoid connections, and the Manifold Pressure Tap. The two yellow wires from the 12-pin plug on the Ignition Board attach to the MV terminals. OUTLET VIEW State Water Heaters 11 Technical Training Department Ashland City, Tennessee © 2007
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENTING All SBN and SBD water heaters are classified by ANSI as Category I (non-condensing, negative pressure venting) appliances. They are approved for type B vent. The draft inducer does not pressurize the exhaust. VENTING – MULTIPLE CATEGORY I GAS WATER HEATERS State Water Heaters 12 Technical Training Department Ashland City, Tennessee © 2007
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENT TABLES FOR CATEGORY I - TYPE B GAS VENT Multiple Gas Fired Tank-Type Heaters When venting multiple Category I tank type heaters using Type B vent pipe, follow the installation tables below which give sizing and data based upon NFPA 54/ANSI Z223.1-2006. Model: SBN 71-120 Input:120,000 Btu/hr. Total Vent Height (feet) Vent Connector Size: 5” 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diame
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENT TABLES FOR CATEGORY I - TYPE B GAS VENT Model: SBN80-180; SBN100-199; SBN100-200; SBD30-199 Input:180,000, 190,000 and 199,000 Btu/hr. Total Vent Height (feet) Vent Connector Size: 6” 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diameter (inches) 180,000 1' 7 7 6 6 6 6 6 6 199,000/200,000 1' 7 7 7 6 6 6 6 6 180,000 2' 6 6 6 6 6 6 6 6 199,000/200,000 2' 7 7 6 6 6 6 6 6 180,000 3' 6 6 6 6 6
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENT TABLES FOR CATEGORY I - TYPE B GAS VENT Model: SBN100-250 Input:250,000 Btu/hr. Total Vent Height (feet) Vent Connector Size: 6” 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diameter (inches) 250,000 1' 8 8 7 7 7 6 6 6 250,000 2' 7 7 7 7 6 6 6 6 250,000 3' 7 7 7 7 6 6 6 6 No. of Units Combined Input (Btu/hr x 1,000) Combined Vent/Manifold Diameter 2 500,000 9 9 9 8 8 7 7 7 3 750,000 12 12
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENT TABLES FOR CATEGORY I - TYPE B GAS VENT Model: SBN 85-310 Input:310,000 Btu/hr. Total Vent Height (feet) Vent Connector Size: 6” 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diameter (inches) 310,000 1' 9 8 8 8 7 7 6 6 310,000 2' 8 8 8 7 7 7 6 6 310,000 3' 8 8 8 7 7 7 6 6 No. of Units Combined Input (Btu/hr x 1,000) Combined Vent/Manifold Diameter 2 620,000 10 10 9 9 8 8 7 7 3 930,000 14 1
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK VENT TABLES FOR CATEGORY I - TYPE B GAS VENT Model: SBN 85-366NE, SBN 85-390NE Input:366,000/399,000 Btu/hr. Total Vent Height (feet) Vent Connector Size: 6” 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diameter (inches) 366,000 9 9 9 8 8 8 8 8 1' 399,000 10 9 9 9 8 8 8 8 366,000 9 9 8 8 8 8 8 8 2' 399,000 9 9 9 8 8 8 8 8 366,000 9 8 8 8 8 8 8 8 3' 399,000 9 9 8 8 8 8 8 8 No. of Units Combined
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK SBN /SBD30-150/199 SEQUENCE OF OPERATION Sequence 2 1. Thermistors (probes) call for heat. 2. Inducer fan starts and provides draft. 3. Hot surface igniter = 20 sec. warm-up. 1 4. Main gas valve opens 4 sec. trial for ignition. (Maximum 5 trials.) 5. Main burner ignites and proves. 6. Thermostat reaches the temperature 6 setting. 7. Main burners “OFF” - Auto restart after 60 min. - 20 sec blower 1 4 5 & 7
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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL GAS WATER HEATER SERVICE HANDBOOK COMBINED VENTING COMBINING VENTS (MANIFOLDING Vent Size Area in Vent Size Area in Square Square When vents are combined, the area of the Inches Inches combined vent should be equal to area of 5" 20 10" 79 the largest single vent, plus 50% of area of 6" 28 12" 113 all others joining. 7" 38 14" 154 EXAMPLE: To combine two 6” vents with 8" 50 16" 201 an 8” vent, the area of a combined vent 9" 64 18" 254 sho
