Dunkirk H2OI Stainless Steel Dual Coil Solar Water Heaters - Manual (Page 15)

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IV. Electrical
1. Install electric wiring and grounding in accordance with the National Electrical code and local regulations.
2. All water heaters are supplied with a thermostat.
3. Refer to wiring schematics for separate circulator wiring.
Refer to wiring schematics for zone valve wiring.
Reference should be made to the Installation Manual for the boiler as well.
V. Operation
Startup
After the water heater has been plumbed and wired, and the boiler water piping is purged of air, the water heater is ready
to be started.
1. Follow the boiler installation instructions to place the boiler in operation.
2. The tank thermostat is factory pre-set to 125 degrees F and will call for heat if the water in the tank is lower
than 125.
3. On a call for heat, the tank thermostat contacts close to start the water heater zone circulator and the boiler.
4. After the tank has reached the temperature setting, the tank thermostat opens and de-energizes the circulator
and the boiler. If there is a call for space heating, the boiler will continue to run until the room thermostats are
satisfied.
Temperature Adjustment
The tank thermostat controls the maximum water temperature in the water heater. If it is set too high, the resulting hot
water can cause painful scalding with possible serious and permanent injury. The temperature at which this occurs varies
with a person’s age, and the length of time in contact with the hot water. The slower response time of infants, older, or
handicapped people increases the hazard for them.
It is recommended that the thermostat be set for the lowest possible temperature that satisfies your needs. This will also
provide you with the lowest energy consumption and cost.
Check the water temperature at a hot water faucet soon after the tank thermostat has satisfied, and the circulator and the
boiler have turned off. Adjust as needed.
Lowering the thermostat setting will not have an immediate effect on the water temperature because the stored water
will have to be used and the thermostat must go through the cycle of heating cold water and satisfying at the new, lower
temperature. Additional temperature checks should follow the completion of a heating cycle. Further adjustments may be
required after you have used the water heater.
Studies have indicated that dangerous
bacteria including legionella pneumophila
can form in potable water distribution system if certain minimum
water temperatures are not maintained. Contact your local health
department for more information.