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SECTION V: OPERATION
THERMOSTAT TEMPERATURE ADJUSTMENT
CAUTION
The temperature setting on the heating element thermostat shall not exceed 160°F.
Likewise, the solar controller potable water temperature setting shall not exceed 160°F.
Install a thermostatic mixing valve or scald protection mixing valve at the outlet of the
water heater to ensure greater control over water temperatures at the point of use.
CAUTION
Turn off all power to the water heater before adjusting the heating element thermostat.
The heating element thermostat is factory adjusted to 120°F (“HOT” indicator setting). If
thermostat adjustment is necessary, disconnect all power to the water heater and solar
collector. Remove the access cover on the side of the water heater and remove the foam dam
insert to expose the thermostat and heating element. The temperature knob can be adjusted
with a screwdriver to a minimum temperature of 110°F and a maximum temperature of 160°F
(labeled “VERY HOT”). See Table 6 for a listing of indicator setting and temperature
relationships.
CAUTION
Hot water in excess of 120°F can cause scalding! The temperature at which injury
occurs varies with the person’s age and the time of exposure. The slower response
time of disabled persons increases the hazards to them. NEVER allow small children to
use a hot water tap. NEVER leave a child or disabled person unattended in a bathtub
or shower.
Replace the foam dam insert and access cover after adjusting/inspecting the thermostat.
If the thermostat temperature setting (or scald protection mixing valve) was adjusted,
check the water temperature at a faucet. Flow enough water through the faucet to ensure
that the faucet temperature reflects the tank temperature. Adjust the thermostat or mixing
valve setting as necessary. Adjusting the thermostat setting (lower or higher) will not
immediately affect the water temperature at the faucet. Flow a sufficient amount of water
or allow a heat-up cycle to complete before making further adjustments.
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Indicator Setting
Temperature (°F)
• (min)
110
HOT
120
A
130
B
140
C
150
VERY HOT
160
Table 6:
Thermostat Temperature Settings
Summary of Contents for NAS200 Series
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