Temperature regulation, High temperature limit controls (eco), Thermostat controls – State SSE-120 User Manual

Page 16: Temperature adjustment

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16

hIGh teMperature lIMIt controls (eco)

This water heater is equipped with an ECO (energy cut out) non

adjustable high temperature limit control. An ECO is a normally

closed switch that opens (activates) on a rise in temperature. If the

ECO switch contacts open (activate) due to abnormally high water

temperatures the control system will lock-out and disable further

heating element operation. It is important that a qualified service

agent be contacted to determine the reason for the ECO activation

before resetting the ECO. Once the reason has been determined

and corrected the ECO can be reset as follows:

The ECO high temperature limit switch is located inside the immersion

temperature probe (two red wires). The ECO switch contacts will open

when the water temperature reaches approximately 202°F/94°C and

close at approximately 120°F/49°C. When the ECO switch contacts

open (activate) the electronic control system locks out and displays a

Fault message. Voltage to the contactor coils and heating elements

is terminated to prevent further heating operation. Should the ECO

activate, the water temperature must drop below 120°F/49°C before

the control system can be reset. Once the water temperature has

cooled below this point the power supply to the water heater must be

turned off and on again to reset the control system.

therMostat controls

The water heaters covered in this instruction manual are equipped

with adjustable thermostat controls to control water temperature. 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 water heater should be located in an area

where the general public does not have access to set temperatures.

Setting the water heater temperatures at 120°f will reduce the

risk of scalds. Some States require settings at specific lower

temperatures.

Figure 3. shows the approximate time-to-burn relationship for normal

adult skin.

teMperature adjustMent

The water heaters covered in this instruction manual are equipped

with an electronic control system. The control system senses

temperature from a factory installed immersion temperature probe

– see the Features and Components illustrations at the beginning

of this manual for location. The “Operating Set Point” is adjusted to

control water temperature. This is an adjustable user setting in the

control system’s “Temperatures Menu.” This and all control system

menus are accessed through the UIM (User Interface Module - see

Figure 3.) located on the front panel of the water heater.

The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C.

The factory setting is 120°F/49°C. See the Control System Operation

section of this manual for instructions on how to adjust the Operating

Set Point and other user settings.

Set the Operating Set Point at the lowest setting which produces an

acceptable hot water supply. This will always give the most energy

efficient operation.

Water Temperature

°F (°C)

Time for 1st Degree Burn

(Less Severe Burns)

Time for Permanent Burns

2nd & 3rd Degree

(Most Severe Burns)

110 (43)

(normal shower temp.)

116 (47)

(pain threshold)

116 (47)

35 minutes

45 minutes

122 (50)

1 minute

5 minutes

131 (55)

5 seconds

25 seconds

140 (60)

2 seconds

5 seconds

149 (65)

1 second

2 seconds

154 (68)

instantaneous

1 second

(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)

fIGure 3.

teMperature reGulatIon

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