Control Circuit, Power Circuit | A.O. Smith DSE-5 THRU DSE-120

AMPERAGE TABLE/OVERCURRENT

PROTECTION

This table provides the total connected heating element load in amperes for branch circuit conductor and over current protection sizing. Single-phase heaters are two wire circuits. Three-phase heaters are three wire circuits. In addition to the foregoing a ground conductor may be required.

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.

CONTROL CIRCUIT

The heater is equipped with 120 volt control circuit where all of the heating elements are switched on and off together. This is the standard circuit and may be used with up to five elements.

The control circuit wiring is 14 AWG rated 600 volts, 105°C.

A low water cutoff switch is available as an optional safety device to protect the elements from damage due to lack of water in the heater.

POWER CIRCUIT

Power circuit wiring is rated 600 volts, 75°C.

HEATER CIRCUITS

WIRING DIAGRAMS

The water heater’s electrical components are pictured and identified in Figure 1.

The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60 hertz alternating current.

The following wiring diagrams are included in this manual to show typical arrangement of electrical components in the control and power circuits by voltage and phase characteristics. They are to be used as a reference by the installer or servicer in performing their work. An actual diagram of the water heater wiring is furnished with the heater.

STANDARD KW INPUTS

Standard	Immersion			Number of				Full Load Current In Amperes
KW	Heaters***		50A Contractors					Single Phase			Three Phase
Ratings	No. Of	Wattage	208V		240V	480V	208V	240V	277V	480V	208V	240V	480V
3	1	3,000					14.4	12.5	10.8	6.3	8.3	7.2	3.6
6	1	6,000	1				28.8	25.0	21.2	12.5	16.7	14.4	7.2
9	1	9,000			1		43.3	37.5	32.5	18.8	25.0	21.7	10.8
12	1	12,000				1	57.7	50.0	43.3	25.0	33.3	28.9	14.4
15	1	15,000					72.1	62.5	54.2	31.3	41.6	36.1	18.0
18*	1	18,000					86.5	75.0	65.0	37.5	50.0	43.3	21.7
24	2	12,000	2				115.4	100.0	86.6	50.0	66.6	57.7	28.9
30	2	15,000			2		144.2	125.0	108.3	62.5	83.3	72.2	36.1
36*	2	18,000					173.1	150.0	130.0	75.0	99.9	86.6	43.3
45	3	15,000	3		3		216.3	187.5	162.5	93.8	124.9	108.3	54.1
54	3	18,000				2	N/A	225.0	194.9	112.5	149.9	129.9	65.0
60**	4	15,000	4		4		N/A	250.0	216.6	125	166.7	145	72
75**	5	18,000	5		5	3	N/A	312.5	270.8	156	208.4	181	90
90**	5	18,000					N/A	375.0	324.9	188	250	217	108

*208V models use one additional immersion heater.

**Available on 50 gallon models or larger.

***Each immersion heater contains three electric elements.

DSE-5 THRU DSE-120 specifications

A.O. Smith is a well-known name in the water heating and treatment industry, recognized for its commitment to innovation and quality. Among its impressive range of products, the DSE-5 through DSE-120 series stands out as a reliable choice for both commercial and industrial water heating applications.

The DSE series is engineered to deliver superior performance and efficiency. These water heaters are designed with advanced technologies that ensure optimal heat transfer and energy conservation. One of the main features of the DSE series is its high efficiency ratings, often reaching up to 90% or higher. This means users can expect significant savings on energy costs while enjoying reliable hot water supply.

A notable characteristic of the DSE series is its robust design. Constructed from high-quality materials, these water heaters are built to withstand challenging operating environments. The series is available in varying capacities, from DSE-5, which accommodates smaller applications, to DSE-120, catering to larger needs. This versatility allows businesses to select the model that best suits their operational requirements.

A.O. Smith has also integrated state-of-the-art control technologies into the DSE series. These heaters feature advanced digital displays that provide real-time monitoring of temperature and pressure, ensuring optimal performance and safety. The intelligent controls enable users to set precise temperature settings, which can be easily adjusted, enhancing user convenience.

Moreover, the DSE series is equipped with multiple safety features, including over-temperature protection, flame failure detection, and build quality that meets or exceeds industry standards. This ensures not only effective operation but also peace of mind for users.

The DSE water heaters are also recognized for their eco-friendly designs. Many models incorporate options for low-emission combustion systems, making them suitable for environmentally-conscious businesses looking to reduce their carbon footprint.

In summary, the A.O. Smith DSE-5 through DSE-120 series embodies reliable, efficient, and innovative water heating solutions. With varying capacities, advanced control technologies, and a commitment to safety and sustainability, these water heaters are ideally suited for diverse commercial and industrial applications. Whether for a small business or a large industrial entity, the DSE series provides a dependable hot water supply while optimizing energy use.