15
INSTALLATION AND OPERATION INSTRUCTIONS
BT INDIRECT SERIES – WATER HEATERS
The water heater is intended to provide many years of reliable service.
Components, such as sensors and relief valves, may be subject to failures that
require service. Depending on the quality of the water supply, sediment and/or
scale may coat the heating coil in the tank and reduce hot water recovery rate.
Failure to use the correct procedures or parts can result in unsafe operation. The
owner should arrange to have the following inspections and simple maintenance
procedures done at the suggested frequencies.
1. Boiler and Domestic Water Piping (Annual)
. Check all piping for signs of
leakage at the joints, unions and shut-off valves. Repair as required.
2. Temperature and Pressure Relief Valve (Annual)
3. Sediment (Annual except where harsh water quality may require more
frequent service)
. Depending on water conditions, a varying amount of
sediment may collect in the tank. Levels requiring service are indicated by a
small temperature difference between the boiler supply and return lines, and
a reduced recovery rate. Repeated flushing usually clears such material. As
a preventive measure, water should be drawn from the drain valve until it
runs clear and the installation of a water filter should be considered.
4. Scale (Annual)
. Hard water may cause scale buildup on the outside of the
heating coil inside the tank. A water softener will help prevent this problem.
Symptoms are identical to sediment buildup. If repeated flushing does not
resolve the problem, chemical cleaning may be required. Proceed as follows:
6.1 Chemical Cleaning of the Heating Coil
1.
To avoid water damage, shut off the cold water supply to the water heater.
2.
Make a note of the DHW temperature control setting on the IBC control, and
turn off the power to the boiler and water heater.
3.
Relieve the water pressure in the tank by opening a hot water faucet. This
will reduce the risk of scalding.
4.
Remove the relief valve from the water heater.
5.
Drain the water heater until the water is at a level equal to 3” above the
thermostat well. This level will cover the coil and the thermostat.
6.
Using a funnel, pour one gallon of commercial ice maker cleaning solution
into the tank through the relief valve opening. Follow the instructions,
cautions, and warnings supplied with the cleaning solution.
7.
Turn on the power to the boiler and water heater, program the IBC control
to its highest DHW temp. setting, and allow the boiler to heat the water until
the control is satisfied. If the boiler control is not satisfied after 45 minutes of
operation, program the IBC DHW control setting to its lowest temp.
8.
Allow the heated solution to set in the tank 30 minutes.
9.
Drain the tank completely using fittings and hoses, as required, to reach a drain.
10.
Fill the water heater tank with fresh, cold, water and drain it completely.
Repeat filling and draining at least three (3) times to flush all of the cleaning
solution from the tank.
11.
Reinstall the relief valve and the drain piping.
12.
Open the cold water supply and fill the tank with water. Purge the air from the
tank and the piping by opening the cold and hot water faucets in the house.
13.
Return the IBC DHW control setting to the temperature noted in Step 2.
MAINTENANCE
6.0
