IBC IWT 50 (01) PDF Document

The specifications for the IBC IWT 50 are as follows:

Max. Operating Pressure: 150 psi

Height: 57 inches / 144.8 cm

Max. Diameter: 22 inches / 55.9 cm

Water temperature for rated output: 180 degrees Fahrenheit / 82 degrees Celsius

Gross tank volume: 53 USG / 201 Liters

Net tank volume: 50.7 USG / 192 Liters

Weight: 127 Lbs / 57.6 kg

Shipping weight: 145 Lbs / 65.7 kg

Domestic conn. size: 3/4 inch M

First hour delivery: 259 Gal/Hr

Continuous Draw: 217 Gal/Hr

Boiler Output Required: 140,000 Btu/Hr

Minimum flow rate: 14 GPM

Heating coil pressure drop: 7 Ft. Hd.

Coil heat transfer area: 10.2 Ft2 / 0.94 m2

The recovery rates for the IBC IWT 50 at 135 degrees Fahrenheit are displayed in the following table:

Boiler Output (BTU/Hr): 50,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 107, Continuous rating (Gal/Hr) 60 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 124, Continuous rating (Gal/Hr) 78

Boiler Output (BTU/Hr): 60,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 118, Continuous rating (Gal/Hr) 72 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 139, Continuous rating (Gal/Hr) 93

Boiler Output (BTU/Hr): 80,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 141, Continuous rating (Gal/Hr) 96 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 169, Continuous rating (Gal/Hr) 124

Boiler Output (BTU/Hr): 100,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 165, Continuous rating (Gal/Hr) 120 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 199, Continuous rating (Gal/Hr) 156

Boiler Output (BTU/Hr): 120,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 188, Continuous rating (Gal/Hr) 144 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 230, Continuous rating (Gal/Hr) 187

Boiler Output (BTU/Hr): 140,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 211, Continuous rating (Gal/Hr) 167 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 259, Continuous rating (Gal/Hr) 217

Boiler Output (BTU/Hr): 160,000 | Boiler Flow 14 gpm / 160 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 211, Continuous rating (Gal/Hr) 167 | Boiler Flow 14 gpm / 180 degrees Fahrenheit: 1st Hour Rating (Gal/Hr) 259, Continuous rating (Gal/Hr) 217

Follow these steps to drain the domestic water system:

Step 1. Shut off the cold water supply at the main shutoff valve.

Step 2. Open one or more faucets to relieve the pressure.

Step 3. Open the system drain, leaving the faucets open.

Follow these steps to fill the tank:

Step 1. Open all faucets to allow air to purge from the tank and piping. Remove screens on faucets.

Step 2. Open the domestic hot water shut-off valve.

Step 3. Slowly open the cold water inlet shut-off valve.

Step 4. Purge all of the air from the domestic water system.

Step 5. Allow the water to run, so that you clear the tank of any debris. Run the water long enough so that it runs clear and to change at least one tank volume change past full.

Step 6. Close all faucets.

Step 7. Reinstall all of the screens in the faucets.

Step 8. Check the system for leaks. Repair as required.

To flush the tank and clean the coil, follow these procedures:

Step 1. To avoid water damage, shut off the cold water supply to the IBC IWT 50.

Step 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.

Step 3. To reduce the risk of scalding, reduce the water pressure in the tank by opening a hot water faucet.

Step 4. Remove the relief valve from the water heater.

Step 5. Drain 1/3 of the water heater so that the tank is two-thirds full. The water level must cover the coil and the thermostat well.

Step 6. Using a funnel, pour one gallon of commercial ice maker cleaning solution into the tank through the relief valve opening.

Step 7. Turn on the power to the boiler and water heater.

Step 8. Program the IBC control to its highest DHW temperature setting, and allow the boiler to heat the water until the control is satisfied.

Step 9. If the boiler control is not satisfied after 45 minutes of operation, program the IBC DHW control setting to its lowest temperature.

Step 10. Allow the heated solution to set in the tank for 30 minutes.

Step 11. Drain the tank completely using fittings and hoses, as required, to reach a drain.

To refill the tank after cleaning, follow these steps:

Step 1. Fill the IBC IWT 50 water heater tank with fresh, cold water and drain it completely.

Step 2. To flush all of the cleaning solution from the tank, refill and drain at least three times.

Step 3. Reinstall the relief valve and the drain piping.

Step 4. Open the cold water supply, and fill the tank with water.

Step 5. Purge the air from the tank and the piping by opening the cold and hot water faucets in the house.

Step 6. Return the IBC DHW control setting to the temperature noted before the cleaning process.

Troubleshoot the lack of hot water as follows:

If the boiler does not operate, ensure boiler power is on, ensure the boiler is programmed for DHW and the water temperatures are set properly, and check the tank temperature on the IBC screen for an open or short sensor or wiring issue.

If the water heater circulator does not operate, ensure the pump relay is closed and supplying power to the pump, ensure the zone valve is open and the end switch is closed calling for heat, check wiring connections at the circulator, measure voltage at the circulator during a call for heat (should see 120VAC), and replace the circulator if power is present and connections are correct.

If the water heater zone valve does not open, check for 24VAC at the zone valve while there is a call for heat, and if correct voltage is available and connections are good, replace the zone valve.

If the tank sensor is open, short, or mis-wired, ensure the tank sensor is connected to the correct terminals, the wires are properly attached to the terminal strip, and the sensor is properly attached to the wiring at the tank. Disconnect the sensor wires from the terminal strip and measure the resistance in Ohms across the 2 sensor wires. Compare this value to the chart in the manual and the actual tank temperature. Repeat this test for the sensor only and compare the results. Check or replace the wire from the boiler to the sensor or replace the sensor.

If the water is too cool, the DHW temperature setting may be too low. Increase the DHW Tank Set Point temperature on the IBC control.

If the water is too hot, check the following:

The DHW temperature setting might be too high; reduce the DHW Tank Set Point temperature.

The boiler Maximum Supply Temp. setting might be too low; make sure the Maximum Supply Temp. setting is at least 10 degrees Fahrenheit higher than the DHW Supply Setpoint PLUS 1/2 of the Supply Diff’l Temp setting.

The DHW temperature sensor might be giving a false reading. Ensure the sensor is fully inserted into the well, check for incorrect resistance readings, ensure the sensor is connected to the DHW Sensor terminals and not the IBC Therm terminals, and check that an improper 3rd party sensor is not installed in the well.