INSTALLATION AND OPERATION INSTRUCTIONS
14
BT INDIRECT SERIES – WATER HEATERS
5.1 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. Follow the boiler installation
and operating instructions to place the boiler in operation.
5.2 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.
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.
CAUTION
AS A PRECAUTION:
After the water heater
has reached its setpoint
temperature, the installer
should locate a faucet that
is unprotected by an over-
temperature device.
Turn the faucet on full, and
allow it to run long enought to
ensure the water and piping
have been heated up to the
discharge temperature of the
tank.
Using an accurate
thermometer, test the water
temperature to ensure it is
within plus or minus 10°F of
the setpoint. If there is more
deviation, the cause should
be determined and corrective
measures taken.
OPERATION
NOTE
DHW TANK SET POINT
The temperature the end
user gets from the faucet.
Recommended to be no higher
than 120°F to prevent scalding.
MAXIMUM SUPPLY TEMP
The highest DHW Supply Set
Point temperature the boiler
will allow. Should be at least
20°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.
TANK DIFF’L TEMP
The variance the control
allows in the DHW Tank Set
Point. A tank differential of
10°F is recommended.
5.0
