4.2 Aquastat
To regulate/limit the temperature, installers can install a field-supplied aquastat such as the Honeywell
L4006.
The aquastat mounts in the well provided on the water heater. Electrically, the aquastat will open on
temperature rise (stops calling for heat when the water reaches the desired temperature) and will close
when the water temperature drops below the desired temperature. The aquastat should have an 8°F
(4.4°C) differential.
To install an aquastat:
1. Carefully bend the capillary tube/sensing bulb so that it is at a right angle to the back of the
control.
2. Loosen the mounting screw and carefully insert the sensing bulb into the well until the control
mounts to the well head.
3. Tighten the screw to lock in place.
4. Connect wires (sized for the voltage being used) to the aquastat terminals.
5. Set the aquastat to the correct temperature by adjusting the dial, so that the desired temperature
is at the pointer.
6. Set the aquastat to the lowest practical setting to meet the consumer’s needs.
Scalding from hot water may occur if the thermostat is set too high. The addition of a scald
protection device may be required either at the outlet of the water heater or at the point of use.
Check with your local plumbing authority for local requirements.
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4.2 Aquastat
Summary of Contents for INTERSTAR IWT Series
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