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5.0 Operation
5.1 Important terms explained
DHW Tank
SetPoint
Temperature the end user gets from the faucet. Recommend no higher than 140°F to
prevent scalding.
Tank Diff'l
Temp
The variance the control allows in the DHW Tank Set Point. A tank differential of
10°F is recommended.
Maximum
Supply
Temp
Highest DHW supply set point temperature the boiler will allow. Should be at least
30°F higher than the DHW supply set point temperature.
Supply Diff'l
Temp
The variance the control allows in the DHW Supply Set Point. Trial setting of 20°F.
Set higher to reduce short-cycling around the DHW Supply Set Point.
5.2 Start-up
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. Follow the boiler installation and operating instructions to place the boiler in
operation.
5.3 Temperature adjustment
The tank sensor 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.
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 stored water is used and because the
thermostat goes 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.
Summary of Contents for INTERSTAR IWT Series
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