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Instruction Manual
co MMerc Ial electr Ic Bo Ilers
Models sw 37-670
InstallatIon - operatIon - ser VIce -
MaIntenance - lIMIted warranty
A DIVISION OF A. O. SMITH CORPORATION
RENTON, WASHINGTON
www.statewaterheaters.com
asM e
Thank you for buying this energy efficient boiler
from us. We appreciate your confidence in our
products.
place these InstructIons adjacent to BoIler and notIfy owner to keep for future reference.
PRINTED 0110 316393-000
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safe InstallatIon, use and ser VIce Your safety and the safety of others is extremely important in the installation, use, and servicing of this boiler. Many safety-related messages and instructions have been provided in this manual and on your own boiler to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install, use, or
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General safety InforMatIon precautIons hydroGen Gas (flaMMaBle) DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system which has been under water. If the unit is exposed to the following, do not operate boiler until all corrective steps have been made by a qualified service agency. 1. External fire. 2. Damage. 3. Firing without water. GroundInG InstructIons This boiler
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taBle of contents SAFE INSTALLATION, USE AND SERVICE...........................................................2 Calculating Amperage/Overcurrent Protection .............................................12 Boiler Circuits ...............................................................................................12 GENERAL SAFETY INFORMATION .......................................................................3 Control Circuits ..............................................................
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dIMensIon data sIZes and data nw37 thru nw150 Model Number Inlet* & Boiler D E F G** H J K S T Outlet* Drain Prefix Gal. Cap. Std. KW Input SW 37 45K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 60K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 75K 32 30 12 42 12 1/2 - - 20 4 2 1 SW 37 90K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 105K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 120K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 150K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 37 180K 32 30 12 42 12 1/2 - - 20 4 3 1 SW 60 210K 32 30 12
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sIZes and data nw220 thru 670 Model Number Inlet* & Boiler D E F G** H J K S T Std. KW Outlet* Drain Prefix Gal. Cap. Input SW 220 780K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 840K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 900K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 960K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 1020K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 1080K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2 SW 220 1140K 60 50 25 71 21 2 25 1/2 30 5 1/2 5 1 1/2
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dIMensIon data (cont’d) BoIler specIfIcatIons (standard) Model Number Amperage 3 Phase Gal./Hr. Number Number Standard Number and BTU 100°F of of Steps KW of Steps Std. KW Output Prefix Gal. Cap. 208V 240V 480V 575V Rise Elements * * Input SW 37 45K 153,585 180 3 1 1@45 128 108 55 45 SW 37 60K 204,720 240 4 1 1@60 171 144 73 60 SW 37 75K 255,975 300 5 1 1@75 213 180 90 75 SW 37 90K 307,170 369 6 3 3@30 250 217 108 90 SW 37 105K 358,365 430 7 4 3@30+1@15 292 253 126 105 SW 37 120K 409,560 492
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features and coMponents actual confIGuratIon May Vary . 8
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approV als asM e Model and ratInG locatInG the BoIler 2. Near a floor drain. The boiler should be located in an area f acts to consIder aBout the locatIon where leakage of the tank or connections will not result in damage to the area adjacent to the boiler or to lower floors of the structure. 3. The discharge opening of the temperature and pressure relief valve should always be piped to an open drain. 4. Close to the point of major hot water usage and the power supply. Hot water piping and
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InstallatIon requIred aBIlIty Installation and service of this boiler requires ability equivalent to that of a qualified agency (page 2) in the field involved. Plumbing and electrical work is required. General The installation must conform with these instructions and the local code authority having jurisdiction and the requirements of the power company. In the absence of code requirements, follow NFPA-70 (current edition). In the absence of local codes, the installation must comply with th
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water pressure due to thermal expansion. Thermal expansion closed water systeMs can cause premature tank failure (leakage). This type of failure Water supply systems may, because of code requirements or such is not covered under the limited warranty. Thermal expansion conditions as high line pressure, among others, have installed can also cause intermittent pressure relief valve operation: water devices such as pressure reducing valves, check valves, and discharged from the valve due to exc
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electrIcal data Refer to ELECTRICAL CONFIGURATION TABLE, below, and wiring General diagram provided with your boiler before completing connections to electrical supply. Check the boiler model and rating plate information against the characteristics of the branch circuit electrical supply. Do not connect NOTE: Wiring diagrams in this manual are typical examples. The the boiler to an improper source of electricity. specific wiring diagram “as built” for your boiler is typically attached to
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w wIIr rIIn nG G d dIIa aG Gra raM Ms s NOTE(S): 1. IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED. STD. WIRING dIaGraM 1. OPTIONAL OR FIELD WIRING AS REQ’D three phase delta wIth therMostat NOTE(S): 1. IF A MANUAL RESET HLMT IS USED, THE SECOND AUTO RESET HLMT SWITCH IS NOT USED. STD. WIRING OPTIONAL OR FIELD WIRING AS REQ’D CONTACTOR COIL dIaGraM 2. INDICATION LIGHT three phase wye wIth therMostat 13
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1 OFF ON 2200 2 OFF ON 135 3 OFF ON 4-20MA 4 OFF ON 0-10VDC 5 DS PROP 6 PROG UN 7 OFF VER 8 SEC MN NOTE(S): 1 DELAY 1 1. SUBSTITUTE A MANUAL RESET HLMT SWITCH FOR ONE(1) OF 2 DELAY 2 THE AUTO RESET HLMT SWITCHES. 3 DELAY 3 STD. WIRING 4 -1- 5 -2- OPTIONAL OR FIELD WIRING AS REQ’D 6 -4- CONTACTOR COIL 7 -5- 8 -16- INDICATION LIGHT THE ABOVE DIP SWITCH SETTINGS ARE AN EXAMPLE FOR THE FOLLOWING: 2200 OHM PROPORTIONAL PROGRESSIVE dIaGraM 3. VERNER “OFF” SECONDS three phase
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operatIon IMportant IT IS RECOMMENDED THAT A QUALIFIED SERVICE TECHNICIAN PERFORM THE INITIAL FIRING OF THE BOILER. AT THIS TIME THE USER SHOULD NOT HESITATE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH THEY MAY HAVE IN REGARD TO THE OPERATION AND MAINTENANCE OF THE BOILER. BEFORE FILLING THE SYSTEM FOR OPERATION the hot water system should be internally cleaned and flushed to remove any contaminants which may have accumulated during installation. See fIllInG the BoIler section of this manua
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Always close and lock the cabinet door after making a temperature teMperature controls adjustment. Turn on electricity. The boilers covered in this instruction manual are equipped with (adjustable) thermostat or step control to regulate water temperature draInInG and other controls to provide safety features. See the wiring diagrams on page 13 & 14 and/or literature included with this manual for additional information. Hot water temperatures required for automatic dishwasher and laundry us
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MaIntenance Boiler maintenance includes periodic tank flushing and cleaning, and Failure to clean the system may cause: removal of lime scale from the heating elements. Circulating pumps should be oiled. 1. Poor heating due to formation of gas. • Residential pipe dope, thread cutting oil, solder flux, dirt and other MaIntenance schedule foreign materials breakdown to form gas. This is indicated by a continuing need for purging even through the system is “closed”. Component Operation Interva
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Lime scale should be removed from the elements by dissolving the • Place limed ends of heating elements into UN•LIME delimer accumulation in UN•LIME® delimer. UN•LIME is a non-muriatic and allow scale to dissolve. Do not permit delimer or water to delimer, available through your dealer or distributor. Do not use contact heating element electrical terminals. muratic or hydrochloric acid base deliming solutions to remove lime 6. Flush cleaned ends of elements with water when deliming or scale
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sw -37 thru sw -670 electrIc hot water BoIler lIMIted warranty State Water Heaters, the warrantor, extends the following LIMITED WARRANTY to the owner of this boiler. 1. THE TANK If the tank in this boiler shall prove upon examination by the warrantor to have leaked due to natural corrosion from water therein, during the FIRST year after initial installation, the warrantor will at its option, repair it or provide a replacement tank less elements and controls of equivalent size and then curren
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A DIVISION OF A. O. SMITH CORPORATION RENTON, WASHINGTON Technical Support: 800 527-1953 Parts Department: 800 433-2515 www.statewaterheaters.com
