IBC IWT 119 (01) PDF Document

The specifications for the IBC IWT 119 are as follows:

Max. Operating Pressure: 150 psi

Height: 65.7 inches / 166.9 cm

Max. Diameter: 28 inches / 71.1 cm

Water temperature for rated output: 180°F / 82°C

Gross tank volume: 119 USG / 450 Liters

Net tank volume: 113 USG / 426 Liters

Weight (empty): 230 Lbs / 104 kg

Shipping weight: 275 Lbs / 125 kg

Domestic connection size: 1.5 inches M

First hour delivery: 474 Gal/Hr

Continuous Draw: 373 Gal/Hr

Boiler Output Required: 240,000 Btu/Hr

Minimum flow rate: 14 GPM

Heating coil pressure drop: 11.8 Ft. Hd.

Coil heat transfer area: 18.3 Ft2 / 1.7 m2

To fill the IBC IWT 119 water heater tank, follow these steps:

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

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

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

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

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 past full.

6. Close all faucets.

7. Reinstall all of the screens in the faucets.

8. Check the system for leaks and repair as required.

The following maintenance schedule is recommended for the IBC IWT 119:

Boiler and Domestic Water Piping: Check all piping for signs of leakage at the joints, unions, and shut-off valves annually. Repair as required.

Temperature and pressure relief valve: Check for leaks or corrosion annually.

Sediment: Depending on water conditions, a varying amount of sediment may collect in the tank. If the recovery rate is reduced, perform a flush. Annually, or more frequently in hard water areas, draw water from the drain valve until it runs clear.

Scale: Hard water may cause scale buildup on the outside of the heating coil inside the tank. If repeated flushing does not resolve the problem, chemical cleaning may be required annually.

To chemically clean the heating coil of the IBC IWT 119, follow these procedures for flushing and refilling:

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

4. Remove the relief valve from the water heater.

5. Drain one third of the water heater so that the tank is two thirds full. The water level must cover the coil and the thermostat well.

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.

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

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

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

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

Refilling steps:

1. Fill the water heater tank with fresh, cold water and drain it completely.

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

3. Reinstall the relief valve and the drain piping.

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

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

6. Return the IBC DHW control setting to the temperature noted in Step 2.

If there is no hot water at the faucets, check the following:

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

Water Heater Circulator does not operate: Ensure the pump relay is closed and supplying power to the pump, the zone valve is open and the end switch is closed calling for heat, and check wiring connections at the circulator. Measure voltage at the circulator during a call for heat (should be 120VAC). If power is at the circulator and connections are correct, replace the circulator.

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

Tank sensor open, short, or mis-wired: Ensure the tank sensor is connected to the correct terminals, 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 two sensor wires to compare with the chart and actual tank temperature. 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.

If the water is too hot: The DHW temperature setting may be too high. Reduce the DHW Tank Set Point temperature. Also, verify that the Boiler Maximum Supply Temp setting is at least 10°F higher than the DHW Supply Setpoint plus one-half of the Supply Differential Temp setting. If the DHW temperature sensor is 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 rather than other terminals, or check if an improper third-party sensor is installed.

To test the temperature sensor, remove power to the boiler and disconnect the sensor leads from the terminal strip. Do not grip the sensor leads in your hands or place them on or against a conductive surface. Place multi-meter probes onto the bare wire ends of the leads and obtain the resistance reading. Compare the reading with the actual sensor temperature using the following table:

Temperature (°F) / Resistance (Ω)

30°F / 34,558 Ω

35°F / 29,996 Ω

40°F / 26,099 Ω

45°F / 22,763 Ω

50°F / 19,900 Ω

55°F / 17,436 Ω

60°F / 15,311 Ω

65°F / 13,474 Ω

70°F / 11,883 Ω

75°F / 10,501 Ω

80°F / 9,299 Ω

85°F / 8,250 Ω

90°F / 7,334 Ω

95°F / 6,532 Ω

100°F / 5,828 Ω

105°F / 5,210 Ω

110°F / 4,665 Ω

115°F / 4,184 Ω

120°F / 3,760 Ω

125°F / 3,383 Ω

130°F / 3,050 Ω

135°F / 2,754 Ω

140°F / 2,490 Ω

145°F / 2,255 Ω

150°F / 2,045 Ω

155°F / 1,857 Ω

160°F / 1,689 Ω

165°F / 1,538 Ω

170°F / 1,403 Ω

175°F / 1,281 Ω

180°F / 1,172 Ω

185°F / 1,073 Ω

190°F / 983 Ω

195°F / 903 Ω