State Industries ASME SW 37 670 User Manual

Instruction Manual  
coMMercIal electrIc BoIlers  
Models sw 37-670  
InstallatIon - operatIon - serVIce -  
MaIntenance - lIMIted warranty  
A DIVISION OF A. O. SMITH CORPORATION  
RENTON, WASHINGTON  
asMe  
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  
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 must be grounded in accordance with the National Electrical  
Code and/or local codes. These must be followed in all cases. Failure  
to ground this boiler properly may also cause erratic control system  
operation on ELECTRONIC CONTROL models.  
Hydrogen gas can be produced in a hot water system served by this boiler  
that has not been used for a long period of time (generally two weeks or  
more). Hydrogen gas is extremely flammable. To reduce the risk of injury  
under these conditions, it is recommended that the hot water faucet be  
opened for several minutes at the kitchen sink before using any electrical  
appliance connected to the hot water system. If hydrogen is present there  
will probably be an unusual sound such as air escaping through the pipe  
as the water begins to flow. THERE SHOULD BE NO SMOKING OR  
OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.  
This boiler must be connected to a grounded metal, permanent wiring  
system, or an equipment grounding conductor must be run with  
the circuit conductors and connected to the equipment grounding  
terminal or lead on the boiler.  
when servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.  
3
taBle of contents  
SAFE INSTALLATION, USE AND SERVICE...........................................................2  
GENERAL SAFETY INFORMATION.......................................................................3  
Precautions ....................................................................................................3  
Hydrogen Gas (Flammable)...........................................................................3  
TABLE OF CONTENTS...........................................................................................4  
INTRODUCTION.....................................................................................................4  
Preparing for the Installation ..........................................................................4  
DIMENSIONS AND CAPACITIES DATA .................................................................5  
FEATURES AND COMPONENTS ..........................................................................8  
APPROVALS...........................................................................................................9  
MODEL AND RATING .............................................................................................9  
LOCATING THE NEW BOILER...............................................................................9  
Facts to Consider About the Location ............................................................9  
INSTALLATION .....................................................................................................10  
Required Ability ............................................................................................10  
General ........................................................................................................10  
Pressure Relief Valve...................................................................................10  
Water Line Connections...............................................................................10  
Closed Water Systems.................................................................................11  
Thermal Expansion ......................................................................................11  
ELECTRICAL DATA...............................................................................................12  
General ........................................................................................................12  
Branch Circuit...............................................................................................12  
Calculating Amperage/Overcurrent Protection.............................................12  
Boiler Circuits...............................................................................................12  
Control Circuits.............................................................................................12  
WIRING DIAGRAMS.............................................................................................13  
OPERATION..........................................................................................................15  
Important......................................................................................................15  
General ........................................................................................................15  
High Temperature Limit ................................................................................15  
Filling the Boiler............................................................................................15  
Initial Start Up...............................................................................................15  
Temperature Regulation...............................................................................15  
Temperature Controls...................................................................................16  
Draining........................................................................................................16  
MAINTENANCE ....................................................................................................17  
Schedule ......................................................................................................17  
System Cleaning..........................................................................................17  
Flushing........................................................................................................17  
Sediment Removal.......................................................................................17  
Lime Scale Removal ....................................................................................17  
TROUBLESHOOTING CHECKLIST .....................................................................18  
Not Enough or No Hot Water .......................................................................18  
Water is Too Hot...........................................................................................18  
Boiler Makes Strange Sounds......................................................................18  
Leakage Checkpoints...................................................................................18  
WARRANTY..........................................................................................................19  
IntroductIon  
Thank You for purchasing this boiler. Properly installed and  
maintained, it should give you years of trouble free service.  
fuses always use the correct size for the circuit. See page 12  
through 14.  
Abbreviations Found In This Instruction Manual:  
The principal components of the heater are identified on page 8.  
The model and rating plate on page 9 interprets certain markings  
into useful information. Both of these references should be used  
to identify the heater, its components and optional equipment.  
ANSI - American National Standards Institute  
ASME - American Society of Mechanical Engineers  
GAMA - Gas Appliance Manufacturer’s Association  
NEC - National Electrical Code  
NFPA - National Fire Protection Association  
UL - Underwriters Laboratory  
2. 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). The National Electrical Code  
may be ordered from: National Fire Protection Association, 1  
Batterymarch Park, Quincy, MA 02269.  
preparInG for the InstallatIon  
1. Read the “General Safety” section of this manual first and  
then the entire manual carefully. If you don’t follow the safety  
rules, the boiler may not operate safely. It could cause DEATH,  
SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.  
3. If after reading this manual you have any questions or do not  
understand any portion of the instructions, call the toll free  
number on the back cover for further assistance.  
A sample rating plate and barcode tag are shown on page 9 of  
this manual. In order to expedite your request, please have the  
serial number and item ID from the barcode tag available for the  
technician.  
This manual contains instructions for the installation, operation,  
and maintenance of the electric boiler. It also contains warnings  
throughout the manual that you must read and be aware of.  
All warnings and all instructions are essential to the proper  
operation of the boiler and your safety. READ THE ENTIRE  
MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE  
THE BOILER.  
4. Carefully plan your intended placement of the boiler. Examine  
the location to ensure the boiler complies with the “Locating the  
New Boiler” section in this manual.  
Detailed installation diagrams are in this manual. These  
diagrams will serve to provide the installer with a reference  
for the materials and method of piping suggested. IT  
IS NECESSARY THAT ALL WATER PIPING AND THE  
ELECTRICAL WIRING BE INSTALLED AND CONNECTED  
AS SHOWN IN THE DIAGRAMS.  
Installation and service of this boiler requires ability equivalent  
to that of a licensed tradesman or qualified agency (page 2) in  
the field involved. Plumbing and electrical work are required.  
5. For installation in California this boiler must be braced or  
anchored to avoid falling or moving during an earthquake. See  
instructions for correct installation procedures. Instructions may  
be obtained from California Office of the State Architect, 1102 Q  
Street, Suite 5100, Sacramento, CA 95811.  
Particular attention should be given to the installation of  
thermometers at the locations indicated in the diagrams as  
these are necessary for checking the operation of the heater.  
Be sure to turn off power when working on or near the electrical 6. Massachusetts Code requires this boiler to be installed in  
system of the heater. Never touch electrical components  
with wet hands or when standing in water. When replacing  
accordance with Massachusetts 248-CMR 2.00: State Plumbing  
Code and 248-CMR 5.00.  
4
dIMensIon data  
sIZes and data nw37 thru nw150  
Model Number  
Inlet* & Boiler  
Outlet* Drain  
D
E
F
G**  
H
J
K
S
T
Prefix  
Gal. Cap.  
Std. KW Input  
SW  
SW  
SW  
SW  
SW  
SW  
SW  
SW  
37  
37  
37  
37  
37  
37  
37  
37  
45K  
60K  
75K  
32  
32  
32  
32  
32  
32  
32  
32  
30  
30  
30  
30  
30  
30  
30  
30  
12  
12  
12  
12  
12  
12  
12  
12  
42  
42  
42  
42  
42  
42  
42  
42  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
20  
20  
20  
20  
20  
20  
20  
20  
4
4
4
4
4
4
4
4
3
3
2
3
3
3
3
3
1
1
1
1
1
1
1
1
90K  
105K  
120K  
150K  
180K  
SW  
SW  
SW  
SW  
60  
60  
60  
60  
210K  
240K  
270K  
300K  
32  
32  
32  
32  
30  
30  
30  
30  
12  
12  
12  
12  
57  
57  
57  
57  
12 1/2  
12 1/2  
12 1/2  
12 1/2  
-
-
-
-
-
-
-
-
20  
20  
20  
20  
4
4
4
4
3
3
3
3
1
1
1
1
SW  
SW  
SW  
SW  
SW  
96  
96  
96  
96  
96  
330K  
390K  
420K  
450K  
480K  
36  
36  
36  
36  
36  
38  
38  
38  
38  
38  
16  
16  
16  
16  
16  
69 1/2  
69 1/2  
69 1/2  
69 1/2  
69 1/2  
17  
17  
17  
17  
17  
1 1/2  
1 1/2  
1 1/2  
1 1/2  
1 1/2  
17  
17  
17  
17  
17  
22  
22  
22  
22  
22  
5
5
5
5
5
4
4
4
4
4
1 1/4  
1 1/4  
1 1/4  
1 1/4  
1 1/4  
SW  
SW  
SW  
SW  
150  
150  
150  
150  
540K  
600K  
660K  
720K  
46  
46  
46  
46  
44  
44  
44  
44  
19  
19  
19  
19  
69 1/2  
69 1/2  
69 1/2  
69 1/2  
20  
20  
20  
20  
2
2
2
2
20  
20  
20  
20  
27  
27  
27  
27  
5 1/2  
5 1/2  
5 1/2  
5 1/2  
5
5
5
5
1 1/2  
1 1/2  
1 1/2  
1 1/2  
* All fittings under 4” will be threaded type. All fittings 4” and larger will be flanged. 3” fittings extend 4” beyond jacket.  
** Where overall height is a problem a larger diameter vessel with a reduced height may be furnished.  
Lifting lugs and channel skid base on 96 gallon and larger units.  
5
sIZes and data nw220 thru 670  
Model Number  
Gal. Cap.  
Inlet* &  
Outlet*  
Boiler  
Drain  
D
E
F
G**  
H
J
K
S
T
Std. KW  
Input  
Prefix  
SW  
SW  
SW  
SW  
SW  
SW  
SW  
220  
220  
220  
220  
220  
220  
220  
780K  
840K  
900K  
60  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
50  
50  
25  
25  
25  
25  
25  
25  
25  
71  
71  
71  
71  
71  
71  
71  
21  
21  
21  
21  
21  
21  
21  
2
2
2
2
2
2
2
25 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
30  
30  
30  
30  
30  
30  
30  
5 1/2  
5 1/2  
5 1/2  
5 1/2  
5 1/2  
5 1/2  
5 1/2  
5
5
5
5
5
5
5
1 1/2  
1 1/2  
1 1/2  
1 1/2  
1 1/2  
1 1/2  
1 1/2  
960K  
1020K  
1080K  
1140K  
SW  
SW  
SW  
SW  
SW  
SW  
334  
334  
334  
334  
334  
334  
1200K  
1260K  
1380K  
1500K  
1620K  
1740K  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
50  
25  
25  
25  
25  
25  
25  
99  
99  
99  
99  
99  
99  
25  
25  
25  
25  
25  
25  
2
2
2
2
2
2
25 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
30  
30  
30  
30  
30  
30  
7 1/4  
7 1/4  
7 1/4  
7 1/4  
7 1/4  
7 1/4  
6
6
6
6
6
6
2
2
2
2
2
2
SW  
SW  
SW  
SW  
400  
400  
400  
400  
1800K  
1860K  
1980K  
2100K  
66  
66  
66  
66  
56  
56  
56  
56  
28  
28  
28  
28  
90 1/2  
90 1/2  
90 1/2  
90 1/2  
25 1/2  
25 1/2  
25 1/2  
25 1/2  
2 1/2  
2 1/2  
2 1/2  
2 1/2  
30  
30  
30  
30  
33  
33  
33  
33  
7 3/4  
7 3/4  
7 3/4  
7 3/4  
8
8
8
8
2
2
2
2
SW  
SW  
SW  
SW  
500  
500  
500  
500  
2200K  
2340K  
2460K  
2580K  
72  
72  
72  
72  
62  
62  
62  
62  
31  
31  
31  
31  
90 1/2  
90 1/2  
90 1/2  
90 1/2  
26 1/2  
26 1/2  
26 1/2  
26 1/2  
2 1/2  
2 1/2  
2 1/2  
2 1/2  
34  
34  
34  
34  
36  
36  
36  
36  
7 3/4  
7 3/4  
7 3/4  
7 3/4  
8
8
8
8
2
2
2
2
SW  
SW  
SW  
SW  
SW  
SW  
670  
670  
670  
670  
670  
670  
2700K  
2820K  
2940K  
3060K  
3180K  
3300K  
78  
78  
78  
78  
78  
78  
68  
68  
68  
68  
68  
68  
34  
34  
34  
34  
34  
34  
96 1/2  
96 1/2  
96 1/2  
96 1/2  
96 1/2  
96 1/2  
30 1/2  
30 1/2  
30 1/2  
30 1/2  
30 1/2  
30 1/2  
2 1/2  
2 1/2  
2 1/2  
2 1/2  
2 1/2  
2 1/2  
38  
38  
38  
38  
38  
38  
39  
39  
39  
39  
39  
39  
7 3/4  
7 3/4  
7 3/4  
7 3/4  
7 3/4  
7 3/4  
8
8
8
8
8
8
2
2
2
2
2
2
NOTE: For boilers 3400KW to 6000KW, consult factory.  
* All fittings under 4” will be threaded type. All fittings 4” and larger will be flanged.  
** Where overall height is a problem a larger diameter vessel with a reduced height may be furnished.  
6
dIMensIon data (cont’d)  
BoIler specIfIcatIons (standard)  
Model Number  
Gal. Cap.  
Amperage 3 Phase  
Gal./Hr.  
100°F  
Rise  
Number Number  
Standard Number and  
BTU  
Output  
of  
of Steps  
*
KW of Steps  
Std. KW  
Input  
Prefix  
208V  
240V  
480V  
575V  
Elements  
*
SW  
SW  
SW  
SW  
SW  
SW  
SW  
SW  
37  
37  
37  
37  
37  
37  
37  
37  
45K  
60K  
75K  
153,585  
204,720  
255,975  
307,170  
358,365  
409,560  
511,950  
614,340  
180  
240  
300  
369  
430  
492  
615  
738  
3
4
5
6
7
8
10  
12  
1
1
1
3
4
4
5
6
1@45  
1@60  
1@75  
128  
171  
213  
250  
292  
334  
417  
500  
108  
144  
180  
217  
253  
289  
361  
433  
55  
73  
90  
108  
126  
144  
180  
216  
45  
60  
75  
90K  
3@30  
90  
105K  
120K  
150K  
180K  
3@30+1@15  
4@30  
105  
121  
151  
181  
5@30  
6@30  
SW  
SW  
SW  
SW  
60  
60  
60  
60  
210K  
240K  
270K  
300K  
716,730  
819,120  
921,510  
1,023,900  
861  
984  
1107  
1230  
14  
16  
18  
20  
7
8
9
7@30  
8@30  
9@30  
10@30  
584  
668  
751  
834  
505  
577  
650  
722  
252  
288  
324  
360  
211  
241  
271  
301  
10  
SW  
SW  
SW  
SW  
SW  
SW  
96  
96  
96  
96  
96  
96  
330K  
360K  
390K  
420K  
450K  
480K  
1,126,290  
1,228,680  
1,331,070  
1,433,460  
1,535,850  
1,638,240  
1353  
1476  
1599  
1722  
1845  
1968  
22  
24  
26  
28  
30  
32  
10  
10  
10  
10  
10  
10  
1@60+9@30  
2@60+8@30  
3@60+7@30  
4@60+6@30  
5@60+5@30  
6@60+4@30  
917  
794  
866  
938  
1010  
1083  
1155  
396  
432  
468  
504  
540  
576  
331  
362  
392  
422  
452  
487  
1001  
1084  
1168  
1251  
1334  
SW  
SW  
SW  
SW  
150  
150  
150  
150  
540K  
600K  
660K  
720K  
1,843,020  
2,047,800  
2,252,580  
2,457,360  
2214  
2460  
2706  
2952  
36  
40  
44  
48  
10  
10  
10  
10  
8@60+2@30  
10@60  
8@60+2@90  
4@90+6@60  
648  
720  
792  
864  
542  
602  
663  
723  
1501  
1668  
1299  
1443  
SW  
SW  
SW  
SW  
SW  
SW  
SW  
220  
220  
220  
220  
220  
220  
220  
780K  
840K  
900K  
2,662,140  
2,866,920  
3,071,700  
3,276,480  
3,481,260  
3,636,040  
3,890,820  
3198  
3444  
3690  
3936  
4182  
4428  
4674  
52  
56  
60  
64  
68  
72  
76  
10  
10  
10  
10  
10  
10  
10  
6@90+4@60  
9@90+1@30  
10@90  
8@90+2@120  
6@90+4@120  
4@90+6@120  
2@90+8@120  
936  
783  
843  
904  
1008  
1080  
1152  
1224  
1296  
1368  
960K  
964  
1020K  
1080K  
1140K  
1024  
1084  
1145  
SW  
SW  
SW  
SW  
SW  
SW  
334  
334  
334  
334  
334  
334  
1200K  
1260K  
1380K  
1500K  
1620K  
1740K  
4,095,600  
4,300,380  
4,709,940  
5,119,500  
5,529,060  
5,938,630  
4920  
5166  
5658  
6150  
6642  
7134  
80  
84  
92  
100  
108  
116  
10  
10  
10  
10  
16  
17  
10@120  
1440  
1512  
1656  
1800  
1944  
2068  
1205  
1265  
1386  
1506  
1627  
1747  
8@120+2@150  
4@120+6@150  
10@150  
10@90+6@120  
10@90+7@120  
SW  
SW  
SW  
SW  
400  
400  
400  
400  
1800K  
1860K  
1980K  
2100K  
6,143,400  
6,348,180  
6,757,740  
7,167,300  
7380  
7626  
8118  
8610  
120  
124  
132  
140  
17  
17  
18  
19  
8@90+9@120  
6@90+11@120  
6@90+12@120  
6@90+13@120  
2160  
2232  
2376  
2520  
1807  
1868  
1988  
2109  
SW  
SW  
SW  
SW  
500  
500  
500  
500  
2220K  
2340K  
2460K  
2580K  
7,576,860  
7,986,420  
8,395,980  
8,805,540  
9102  
9594  
10080  
10578  
148  
156  
164  
172  
15  
20  
20  
20  
1@120+14@150  
18@120+2@90  
18@120+2@150  
14@120+6@150  
2664  
2808  
2952  
3096  
2229  
2350  
2470  
2590  
SW  
SW  
SW  
670  
670  
670  
2700K  
2820K  
2940K  
9,315,100  
9,624,660  
10,034,220  
11070  
11562  
12054  
180  
188  
196  
20  
20  
20  
10@120+10@150  
6@120+14@150  
2@120+18@150  
3240  
3384  
3528  
2711  
2832  
2952  
NOTE: For boilers 3000KW to 6000KW consult factory.  
*Consult factory for optional number of steps and Kw per step.  
7
features and coMponents  
actual confIGuratIon May Vary.  
8
approVals  
asMe  
Model and ratInG  
locatInG the BoIler  
2. Near a floor drain. The boiler should be located in an area  
facts 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 branch circuit wiring should be as short as possible.  
Insulate hot and cold water piping where heat loss and condensation  
may be a problem.  
Boiler construction permits installation, maintenance, and service  
work to be performed through panels located in multiple sides of the  
boiler.  
Carefully choose a location for the boiler. The placement is a very  
important consideration for the safety of the occupants in the building  
and for the most economical use of the appliance.  
Suggested clearances from adjacent surfaces are 12 inches on top,  
30 inches in front for access to the unit.  
Whether replacing an old boiler or putting the boiler in a new location,  
the following critical points must be observed. The boiler must be  
located:  
The boiler may be installed in a confined space if adequate ventilation  
is provided.  
1. On a level surface. Shim the channel type skid base as The temperature of the space in which the boiler is installed must not  
go below 32°F or above 122°F.  
necessary if levelling is required.  
9
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 the latest editions of the National  
Electrical Code, NFPA 70 or the Canadian Electrical Code CSA  
C22.1. The National Electrical Code may be ordered from:  
National Fire Protection Association, 1 Batterymarch Park, Quincy,  
MA 02269. The Canadian Electrical Code is available from the  
Canadian Standards Association, 8501 East Pleasant Valley Road,  
Cleveland, OH 44131.  
A discharge pipe from the relief valve should terminate at an  
adequate floor drain. Do not thread, plug, or cap the end of the  
drain line.  
Do not test electrical system before boiler is filled with water,  
follow the START UP procedure in the OPERATION section of this  
manual.  
The principal components of the boiler are identified in the Features  
and Components illustration on page 8.  
Boilers are usually placed in a series with the heating system on  
the outlet side of the circulating pump. The boiler piping should  
include inlet and outlet water valves to permit maintenance and  
service work to be performed without disturbing the rest of the  
system.  
The Discharge Pipe:  
Detailed system installation drawings are normally provided by the  
equipment purchaser or system designer.  
• Shall not be smaller in size than the outlet pipe size of the valve,  
or have any reducing couplings or other restrictions.  
• Shall not be plugged or blocked.  
• Shall not be exposed to freezing temperatures.  
• Shall be of material listed for hot water distribution.  
• Shall be installed so as to allow complete drainage of both the  
relief valve and the discharge pipe.  
• Must terminate a maximum of six inches above a floor drain or  
external to the building. In cold climates, it is recommended that  
the discharge pipe be terminated at an adequate drain inside the  
building.  
• Shall not have any valve or other obstruction between the relief  
valve and the drain.  
pressure relIef ValVe  
Once the boiler is installed and filled with water and the system is  
pressurized, manually test the operation of the pressure relief valve.  
See the maintenance section of this manual forinstructions.  
An ASME rated pressure relief valve is furnished with the boiler. A  
fitting for the relief valve is provided in the top of the boiler. Never  
operate the heating elements without being certain the boiler is filled  
with water and a properly sized pressure relief valve is installed in  
the relief valve opening provided.  
water lIne connectIons  
The boiler may be installed by itself, or with a separate storage tank,  
on both single and two-temperature systems. When used with a  
separate storage tank, the circulation may be either by gravity or  
by means of a circulating pump. When a circulating pump is used  
it is important to note that the flow rate should be slow so that there  
will be a minimum of turbulence inside the heater.  
The pressure rating of the relief valve should be equal to or less  
than the rated pressure capacity of any component in the system  
including the boiler. Should the valve need to be replaced, call the  
toll free phone number listed on the back of this manual for further  
technical assistance.  
10  
water pressure due to thermal expansion. Thermal expansion  
can cause premature tank failure (leakage). This type of failure  
is not covered under the limited warranty. Thermal expansion  
closed water systeMs  
Water supply systems may, because of code requirements or such  
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  
back flow preventers. Devices such as these cause the water  
system to be a closed system.  
discharged from the valve due to excessive pressure build up.  
This condition is not covered under the limited warranty. The  
pressure relief valve is not intended for the constant relief of  
thermal expansion.  
therMal eXpansIon  
A properly sized thermal expansion tank should be installed  
on all closed systems to control the harmful effects of thermal  
expansion. Contact a local plumbing service agency to have a  
thermal expansion tank installed.  
As water is heated, it expands (thermal expansion). In a closed  
system the volume of water will grow when it is heated. As the  
volume of water grows there will be a corresponding increase in  
11  
electrIcal data  
Refer to ELECTRICAL CONFIGURATION TABLE, below, and wiring  
diagram provided with your boiler before completing connections to  
electrical supply.  
General  
Check the boiler model and rating plate information against the  
characteristics of the branch circuit electrical supply. Do not connect  
the boiler to an improper source of electricity.  
NOTE: Wiring diagrams in this manual are typical examples. The  
specific wiring diagram “as built” for your boiler is typically attached to  
the “inner side” of the control panel.  
Voltage applied to the boiler should not vary more than + 5% to -10%  
of the model and rating plate marking for satisfactory operation.  
control cIrcuIt  
Do not energize the branch circuit for any reason before the boiler is  
filled with water. Doing so may cause the heating elements to burn  
out. Such damage is not covered under the terms of the warranty.  
All control circuits are operated on single-phase 120V. A transformer  
is used in the control circuit.  
The branch circuit is connected to the block through an opening  
provided on top of the boiler.  
Control circuit wiring is 14 Awg, THHN or THWN type, rated 600  
volts, 105°C.  
The boiler should be connected to a separate, grounded, branch  
circuit with overcurrent protection and disconnect switch. These are  
part of the electrical supply system not components of the boiler,  
as such they are obtained locally. The boiler should be grounded in  
accordance with national and local codes.  
Seperate instructional literature is provided with the boiler for step control.  
portion of table 310-16  
portion of table 310-16  
Allowable Ampacities of Insulated Allowable Ampacities of Insulated  
Copper Conductors  
Aluminum and Copper-Clad  
Aluminum Conductors  
Branch cIrcuIt  
Not more than three conductors in  
raceway or cable or direct burial Not more than three conductors in  
(based on ambient temperature of raceway or cable or direct burial  
The branch circuit wire size should be established through reference  
to the National Electrical Code or other locally approved source in  
conjunction with boiler amperage rating. Branch circuit wiring which  
connects to the boiler terminal block should be temperature rated  
at 75°C. For convenience, portions of the wire size tables from the  
Code are reproduced here. It is suggested the electrician size the  
branch circuit at 125 percent of the boiler rating and further increase  
wire size as necessary to compensate for voltage drop in long runs.  
Branch circuit voltage drop should not exceed 3% at the boiler.  
30°C, 86°F.)  
(based on ambient temperature of  
30°C, 86°F.)  
temperature  
rating of  
conductor. see  
table 310-13 in  
temperature  
rating of  
conductor. see  
table 310-13 in  
size  
code  
size  
code  
75°c (167°f)  
75°c (167°f)  
types rh,  
rhw, ruh (14-  
2), thw, thwn,  
types rh,  
rhw, ruh (12-  
2), thw, thwn,  
awG  
McM  
awG  
McM  
calculatInG aMperaGe/  
oVercurrent protectIon  
Xhhw, use  
- - - - -  
- - - - -  
15  
Xhhw, use  
15  
The boiler is factory wired for connection to three wire single-phase  
or three and four wire three-phase branch circuits. In addition, a  
ground conductor may be required.  
18  
16  
14  
12  
10  
8
25  
40  
50  
12  
20  
6
10  
8
6
4
3
2
1
1/0  
2/0  
3/0  
4/0  
250  
300  
350  
400  
500  
600  
700  
750  
800  
900  
30  
45  
65  
85  
100  
115  
4
3
2
1
65  
75  
90  
A diagram of the wiring “as built” is furnished with the boiler for the  
electrician’s use.An amperage table is on pages 7 & 12 of this manual.  
The boiler model and rating plate provides full load amperage data.  
Typical or Standard wiring diagrams are provided on pages 13 & 14  
of this manual.  
100  
120  
135  
155  
180  
205  
230  
250  
270  
310  
340  
375  
385  
395  
425  
445  
485  
520  
1/0  
2/0  
3/0  
4/0  
250  
300  
350  
400  
500  
600  
700  
750  
800  
900  
1000  
1250  
1500  
130  
150  
175  
200  
230  
255  
285  
310  
335  
380  
420  
460  
475  
490  
520  
The rating of the overcurrent protection should be computed on the  
basis of 125 percent of the total connected load amperage. Where the  
standard ratings and settings do not correspond with this computation,  
the next higher standard rating or setting should be selected.  
BoIler cIrcuIts  
The boiler’s electrical components are pictured and identified on  
page 8. The model and rating plate illustration on page 9 identifies the  
electrical characteristics. Basically, there are two electrical circuits:  
• The control circuit, where the temperature control directly or  
indirectly operates the contactor coils.  
1750  
2000  
545  
560  
1000  
1250  
1500  
1750  
2000  
545  
590  
625  
650  
665  
• The power circuit, which is operated by the control circuit, carries  
the electrical load of the heating elements.  
These capacites relate only to conductors  
described in Table 310-13 in Code.  
Thefollowingdescribesthecircuitsandincludestypicalwiringdiagrams.  
All circuits are designed for 60 or 50 Hertz alternating current.  
For ambient temperatures over 30°C, see  
Correction Factors, Note 13 in Code  
12  
wIrInG dIaGraMs  
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  
dIaGraM 1.  
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  
1 OFF  
2 OFF  
3 OFF  
4 OFF  
5 DS  
ON 2200  
ON 135  
ON 4-20MA  
ON 0-10VDC  
PROP  
6 PROG  
7 OFF  
8 SEC  
UN  
VER  
MN  
NOTE(S):  
1
2
3
4
5
6
7
8
DELAY 1  
DELAY 2  
DELAY 3  
-1-  
-2-  
-4-  
1. SUBSTITUTE A MANUAL RESET HLMT SWITCH FOR ONE(1) OF  
THE AUTO RESET HLMT SWITCHES.  
STD. WIRING  
OPTIONAL OR FIELD WIRING AS REQ’D  
CONTACTOR COIL  
INDICATION LIGHT  
-5-  
-16-  
THE ABOVE DIP SWITCH SETTINGS  
ARE AN EXAMPLE FOR THE FOLLOWING:  
2200 OHM  
PROPORTIONAL  
PROGRESSIVE  
VERNER “OFF”  
SECONDS  
10 SECOND  
dIaGraM 3.  
three phase delta wIth step control  
3 STAGE  
1 OFF  
2 OFF  
3 OFF  
4 OFF  
5 DS  
ON 2200  
ON 135  
ON 4-20MA  
ON 0-10VDC  
PROP  
6 PROG  
7 OFF  
8 SEC  
UN  
VER  
MN  
1
2
3
4
5
6
7
8
DELAY 1  
DELAY 2  
DELAY 3  
-1-  
-2-  
-4-  
NOTE(S):  
1. SUBSTITUTE A MANUAL RESET HLMT SWITCH FOR ONE(1) OF  
THE AUTO RESET HLMT SWITCHES.  
STD. WIRING  
-5-  
-16-  
OPTIONAL OR FIELD WIRING AS REQ’D  
CONTACTOR COIL  
INDICATION LIGHT  
THE ABOVE DIP SWITCH SETTINGS  
ARE AN EXAMPLE FOR THE FOLLOWING:  
2200 OHM  
PROPORTIONAL  
PROGRESSIVE  
VERNER “OFF”  
SECONDS  
10 SECOND  
dIaGraM 4.  
three phase wye wIth step control  
3 STAGE  
14  
operatIon  
IMportant  
IT IS RECOMMENDED THATAQUALIFIED 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  
section of this manual titled SYSTEM CLEANING.  
fIllInG the BoIler  
Refer to SYSTEM CLEANING section for preparing the system prior  
to final filling and operation.  
General  
Never operate the heating elements without being certain the boiler  
is filled with water and a pressure relief valve is installed in the relief  
valve opening provided.  
lwco  
An electronic type low water cutoff is provided on all boilers as  
standard equipment. The water probe is installed near the top of the  
tank to monitor the presence of water. The control circuit is opened if  
the water level is below this point.  
power on/off  
Hard Water: in areas which have hard water it may be desirable  
to fill the system with soft water and/or provide water treatment as  
recommended by a consultant familiar with local conditions. In this way  
harmful water scale build-up on the heating elements is minimized.  
The pilot switch on the cabinet front permits the boiler to be turned  
on and off without having to operate the electrical disconnect  
switch. Additional switches may be provided for manually operating  
contactor coils.  
1. Close the boiler drain valve and system valves as necessary.  
2. Open a vent in the highest point of the system to allow the air to escape.  
3. Fully open the make-up water inlet valve. Fill the boiler and piping.  
4. Close the vent as water starts to flow from the opening. Place the  
make-up water valve in the desired position. The boiler is now  
ready for START UP and TEMPERATURE REGULATION if being  
placed in operation for the first time.  
relief Valve  
An ASME rated pressure relief valve is furnished with the boiler. A  
fitting for the relief valve is provided in the top of the boiler. A drain  
line from the relief valve should terminate near a suitable drain. Do  
not thread, plug, or cap the end of the drain line.  
The pressure setting of the relief valve should not exceed the pressure  
capacity of any component in the system including the boiler.  
InItIal start up  
hIGh teMperature lIMIts  
The following checks should be made by the installer when the boiler  
is placed into operation for the first time:  
automatic high limit  
The boiler control circuit contains two high temperature cutoff  
switches. This device shuts off the heating elements if excessive  
water temperatures are reached. The high temperature cutoff has  
an adjustable range of 100° to 240°F and automatically resets on a  
drop of temperature.  
1. Check all factory and field made water and electrical connections  
for tightness.  
• Repair water leaks and tighten electrical connections as necessary.  
2. Turn on the electrical disconnect switch and pilot switch(es)  
mounted on the boiler cabinet.  
3. Observe the operation of the boiler during the first heating cycle.  
Temperature control and contactor operation should be checked by  
allowing the boiler to come up to temperature and shutoff automatically.  
Manual high limit (optional)  
A manual reset high limit may be in the control circuit in addition  
to the automatic high limit previously described. The control has  
an adjustable range of 110°F to 290°F and activates and locks  
on a temperature increase. When the temperature declines the  
manual reset high limit can be reset. A manual reset high limit  
is an optional substitution for one of the automatic high limits  
mentioned above.  
teMperature reGulatIon  
Always turn off the electricity at the electrical disconnect switch when  
making a temperature control adjustment.  
The manual reset button is located on the high limit switch which is  
located in the control panel.  
It is suggested the temperature adjustment be turned to the lowest  
setting which satisfies the hot water requirements of the system.  
15  
Always close and lock the cabinet door after making a temperature  
adjustment. Turn on electricity.  
teMperature controls  
The boilers covered in this instruction manual are equipped with  
(adjustable) thermostat or step control to regulate water temperature  
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.  
draInInG  
Hot water temperatures required for automatic dishwasher and  
laundry use can cause scald burns resulting in serious personal injury  
and/or death. The temperature at which injury occurs varies with the  
person’s age and duration of exposure. The slower response time  
of children, the elderly or disabled persons increases the hazards to  
them. Never allow small children to use a hot water tap or draw their  
own bath water. Never leave a child or disabled person unattended  
in a bathtub or shower. The boiler should be located in an area where  
the general public does not have access to set temperatures.  
Figure 1. shows the approximate time-to-burn relationship for normal  
adult skin.  
The boiler must be drained if it is to be shut down and exposed to  
freezing temperatures. Maintenance and service procedures may  
also require draining the boiler.  
Time to Produce 2nd & 3rd  
Water Temperature  
Degree Burns on Adult Skin  
1. Turn off the electrical disconnect switch.  
180°F (82°C)  
160°F (82°C)  
150°F (82°C)  
140°F (82°C)  
130°F (82°C)  
120°F (82°C)  
80°F (82°C)  
Nearly Instantaneous  
About 1/2 second  
About 1-1/2 seconds  
Less than 5 seconds  
About 30 seconds  
More than 5 minutes  
- - - - - - - - - - - - - - - - -  
2. Open a nearby outlet until the water is no longer hot and close the  
make-up water valve and system valves as necessary.  
3. Open a nearby outlet to vent the parts of the system being drained.  
4. Open the boiler drain valve.  
5. If the boiler is being drained for an extended shutdown, it is  
suggested the drain valve be left open during this period.  
fIGure 1.  
• Additional instructional literature is provided with the boiler for  
adjusting this control.  
• Follow FILLING instructions to restore boiler to service.  
16  
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  
foreign materials breakdown to form gas. This is indicated by a  
continuing need for purging even through the system is “closed”.  
2. Pump seal leakage.  
• Acidic water (low pH) and contamination such as soil and sand  
result in premature or recurring pump seal failures.  
3. Automatic air valve leakage.  
• Contaminants cause sticky sealing surfaces and result in leakage.  
4. Relief valve operation.  
• Gas formation increases system pressure and relief valve spillage.  
5. Water leaks at joints and fittings.  
• Corrosion and eventual failure of connections occur when  
system pH is low.  
6. Noisy operation.  
• Heat transfer surfaces can be fouled with dirty, oily water. This  
plus gas lead to noisy water circulation.  
MaIntenance schedule  
Component  
Tank  
Operation  
Flushing  
Sediment  
Removal  
Interval  
Monthly  
Required  
As Needed  
UN•LIME®  
Delimer and  
element gaskets  
Lime Scale  
Removal  
Elements  
As Needed  
Circulating Pump(s)  
Oiling  
Per pump makers instructions  
Anually  
Pressure Relief  
Valve Test  
Manually  
Operate  
pressure relIef ValVe test  
flushInG  
The pressure relief valve must be manually operated at least once a  
year. Caution should be taken to ensure that (1) no one is in front of  
or around the outlet of the pressure relief valve discharge line, and  
(2) the water manually discharged will not cause any bodily injury or  
property damage because the water may be extremely hot.  
1. Turn off the electrical disconnect switch.  
2. Open the boiler drain valve. Allow water to flow to an open drain  
until it runs clean. Do not come in contact with the water being  
drained as it may be very hot.  
3. Close the drain valve when finished flushing.  
4. Turn on the electrical disconnect switch.  
To test the relief valve, lift the lever at the end of the valve several times,  
see Figure 2. The valve should seat properly and operate freely.  
sedIMent reMoVal  
Water borne impurities consist of fine particles of soil and sand which  
settle out and form a layer of sediment on the bottom of the tank. In time,  
if not removed, the level of sediment might reach the heating elements.  
For convenience, sediment removal and element lime scale removal  
should be performed at the same time as follows:  
fIGure 2.  
If after manually operating the valve, it fails to completely reset and  
continues to release water, turn off power to the boiler at the main  
disconnect switch or breaker. Close the cold water inlet to the boiler and  
follow the draining instructions in this manual to drain the boiler. Should  
the relief valve need to be replaced, call the toll free phone number  
listed on the back of this manual for further technical assistance.  
water and lIMe scale reMoVal  
Water and lime scale accumulations on the heating elements is a  
normal condition, common to all immersion type elements. Factors  
which affect the amount of this formation are:  
1. Amount of make-up water used. As the volume of make-up water  
heated increases, more scale results.  
2. Water temperature. As the temperature of the water is increased,  
more scale is deposited on the elements.  
3. Characteristics of water supply. Regardless of water treatment,  
the elements should be examined regularly.  
Tank flushing and circulating pump lubrication should be performed  
in accordance with the above schedule. Tank sediment removal and  
element lime scale removal must be performed when needed as  
determined by period inspections. Following are the instructions for  
performing recommended maintenance.  
systeM cleanInG  
Water scale accumulations may cause noises to occur during operation.  
The hot water system should be internally cleaned and flushed to  
removecontaminantswhichmayhaveaccumulatedduringinstallation.  
System cleaning provides chemical stability necessary for component  
life and system performance.  
It is recommended that a lower heating element be removed  
periodically for examination. If it is scaled, all of the elements should  
be removed and cleaned. If the tank bottom has an accumulation of  
sediment, it should be cleaned.  
17  
Lime scale should be removed from the elements by dissolving the  
accumulation in UN•LIME® delimer. UN•LIME is a non-muriatic  
delimer, available through your dealer or distributor. Do not use  
• Place limed ends of heating elements into UN•LIME delimer  
and allow scale to dissolve. Do not permit delimer or water to  
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 from the elements. Do not pour delimer into tank.  
cleaning is completed.  
7. Remove sediment and scale from the tank bottom through the  
tank cleanout.  
All models:  
1. Turn off electrical disconnect switch.  
• The make-up water valve and boiler drain valve may be opened  
to flush during the cleanout process.  
8. Clean remaining gasket material from tank and element flanges. Do  
not reuse original element gasket. The element gasket is Part No.  
5109.  
2. Drain the boiler following DRAINING instructions.  
3. Remove the cabinet panel which covers the heating elements.  
• Remove insulation as necessary to reach the element area.  
4. Remove the bolts from each element and remove the elements  
from the opening.  
9. Replace elements as follows:  
• Disconnect element wiring as necessary.  
• Use a twisting, pulling action to remove elements scaled beyond  
the size of the tank opening.  
• Put a new gasket on each element.  
• Install into tank opening.  
• Uniformly tighten element bolts. Torque to approximately 32 ft /lbs.  
10. Connect element wiring as necessary.  
• Brush loose scale from elements.  
• Silicates,sulfatesandaluminatesmustberemovedbyscrapingor 11. Follow FILLING instructions to restore boiler to service.  
other mechanical means. Lime scale dissolvents will not remove  
these types of scale which are occasionally encountered.  
5. Lime scale removal:  
• Check for water leaks around elements and proper  
operation when boiler is filled.  
• Replace insulation and cabinet panel.  
trouBleshootInG checklIst  
Before calling for service, check the following points to see if the  
cause of trouble can be identified and corrected. Reviewing this  
checklist may eliminate the need of a service call and quickly restore  
sizzling and hissing noises when the boiler is operating.  
• The sounds are normal , however, the tank bottom and elements  
should be cleaned. Refer to MAINTENANCE for details.  
the boiler to service. The illustration on page 5 identifies the location 2. Some of the electrical components of the boiler make sounds  
of most of the boiler components.  
which are normal.  
• Contactors will “click” or snap as the boiler starts and stops.  
• Transformers and contactors often hum.  
BE SURE TO TURN OFF THE ELECTRICITY WHEN CHECKING  
EQUIPMENT.  
water leakage is suspected  
not enough or no hot water  
1. Check to see if the drain valve is tightly closed.  
1. Be certain the electrical disconnect switch serving the boiler is in the 2. If the outlet of the relief valve is leaking it may represent:  
ON position. The pilot switch(es) on the cabinet front should be on.  
• In some installations the boiler electrical service may be limited  
• Excessive water pressure or air in the system.  
• Faulty relief valve.  
by the power company or boiler controls. If the boiler operates 3. Examine the flange area of the elements and tank cleanout for  
on a controlled circuit heat may be effected.  
2. Check the fuses.  
• The electrical disconnect switch usually contains fuses.  
• The boiler has fuses located behind the cabinet door, see page  
5 for location.  
gasket leakage.  
• Tighten the bolts or, if necessary, follow the WATER AND LIME  
SCALE REMOVAL procedure to replace the gaskets.  
systeM water test  
3. If the water was excessively hot, and is now cold, the high  
temperature cutoff may have operated (manual reset equipped  
models).  
To reset, turn off electricity and remove the back panel and push  
the reset button.  
system water test  
ReviewSYSTEMCLEANINGsection,foradescriptionofsixproblems  
which result from loss of system chemical stability. Chemical stability  
is checked by:  
• Repeated operation of the high temperature cutoff should be  
investigated by your servicer.  
1. Draw off water from system. Is it dirty, discolored or odorous?  
2. What is the pH of the system water? It should be neutral or slightly  
alkaline.  
3. Does “air” purged from system vents burn? If so, the “air” is  
actually gas.  
4. The capacity of the boiler may have been exceeded by a large  
demand for heat.  
• Large demands require a recovery period to restore water  
temperature.  
5. Sediment or lime scale may be affecting boiler operation. Refer to  
MAINTENANCE for details.  
If any of the above conditions are present, all waterways should be  
cleaned and the water adjusted to an alkaline condition.  
water is too hot  
If you cannot identify or correct the source of malfunction:  
1. Refer to TEMPERATURE REGULATION.  
Boiler makes sounds  
1. Place the boiler electrical disconnect switch in the OFF position.  
2. Close the make-up water inlet valve to the boiler.  
3. Contact your servicer.  
1. Sediment or lime scale accumulation on the elements may cause  
18  
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 current model. Some government agencies are requiring energy efficient standards for boilers. In the event regulations prohibit sale of a model  
of equivalent size and construction, State Water Heaters will provide a model which complies with the regulations of your area, in which case the  
consumer will be charged the difference in price between the like replacement and the energy efficient model required. The warranty on the repair or  
replacement of the part, portion or tank will be limited to the unexpired term of the original warranty.  
2. ALL OTHER PARTS  
If within ONE year after initial installation of this boiler, any part or portion shall prove upon examination by the warrantor to be defective in material  
or workmanship, the warrantor will repair or replace such part or portion at its option.  
3. CONDITIONS AND EXPECTATIONS  
This warranty shall apply only when the boiler is installed in accordance with local plumbing and building codes, ordinances and regulations,  
the printed instructions provided with it and good industry practices. In addition, a pressure relief valve, approved by the American Society of  
Mechanical Engineers, must have been installed.  
This warranty shall apply only when the boiler is used:  
a. (1) at temperatures not exceeding the maximum setting of its control;  
(2) at water pressure not exceeding the working pressure shown on the boiler;  
(3) when filled with water, free to circulate at all times and with the tank free of damaging scale deposits;  
(4) in a noncorrosive and non-contaminated atmosphere;  
(5) in its original installation location;  
(6) in the United States, its territories or possessions, and Canada;  
(7) when operated free of the damaging effects of uncontrolled thermal expansion and/or water hammer.  
b. Any accident to the boiler, any misuse, abuse (including freezing) or alteration of it, any operation of it in a modified form will void this warranty.  
4. SERVICE AND REPAIR EXPENSE  
Under this limited warranty the warrantor will provide only repair or a replacement tank or part thereof. The owner is responsible for all other costs.  
Such costs may include but are not limited to:  
a. Labor charges for service, removal, repair, or reinstallation of the tank or any component part;  
b. Shipping, delivery, handling, and administrative charges for forwarding the new tank or replacement part from the nearest distributor and  
returning the claimed defective tank or part to such distributor.  
c. All cost necessary or incidental for any materials and/or permits required for installation of the replacement tank or part.  
5. LIMITATION ON IMPLIED WARRANTIES  
Implied warranties, including any warranty of merchantability imposed on the sale of this boiler under state law are limited to one (1) year duration for  
the tank or any of its parts. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.  
6. CLAIM PROCEDURE  
Any claim under this warranty should be initiated with the dealer who sold the boiler, or with any other dealer handling the warrantor’s products. If  
this is not practicable, the owner should contact:  
U.S. Customers  
State Water Heaters  
500 Tennessee Waltz Parkway  
Ashland City, TN 37015  
Telephone: 800-365-0024  
Canadian Customers  
State Water Heaters  
599 Hill St. W.  
Fergus, ON N1M 2X1  
Attn: Warranty  
Telephone: 888-479-9283  
a. The warrantor will only honor replacement with identical or similar tank or parts thereof which are manufactured or distributed by the warrantor.  
b. Dealer replacements are made subject to in-warranty validation by warrantor.  
7. DISCLAIMER  
NO OTHER EXPRESS WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF OF THE WARRANTOR WITH RESPECT TO THE BOILER OR  
THE INSTALLATION, OPERATION, REPAIR OR REPLACEMENT OF THE TANK OR PARTS. THE WARRANTOR SHALLNOT BE RESPONSIBLE  
FOR WATER DAMAGE, LOSS OF USE OF THE UNIT, INCONVENIENCE, LOSS OR DAMAGE TO PERSONAL PROPERTY, OR OTHER  
CONSEQUENTIAL DAMAGE. THE WARRANTOR SHALL NOT BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR DAMAGE  
TO ANY PERSONS OR PROPERTY, WHETHER DIRECT OR INDIRECT, AND WHETHER ARISING IN CONTRACT OR IN TORT.  
a. Some states do not allow the exclusion or limitation of the incidental or consequential damage, so the above limitation or exclusion may not apply  
to you.  
b. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and ASME numbers are found on the boiler’s rating plate.  
Model No. ________________________________________________ ASME No. _______________________Date Installed_________________  
Dealer’s Name_________________________________________________________________________________________________________  
Dealer’s Address ___________________________________________________________________________Phone No. ___________________  
City and State _____________________________________________________________________________Zip _________________________  
KEEP THIS WARRANTY AND MANUAL POSTED ADJACENT TO THE BOILER FOR FUTURE REFERENCE WHENEVER MAINTENANCE,  
ADJUSTMENT OR SERVICE IS REQUIRED. BE SURE YOUR DEALER HAS FILLED IN THIS WARRANTY.  
19  
A DIVISION OF A. O. SMITH CORPORATION  
RENTON, WASHINGTON  
Technical Support: 800 527-1953  
Parts Department: 800 433-2515  

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