IBC IWT 119-MAX (01) PDF Document

The following table provides the dimensions and weights for the IBC IWT 119-MAX:

The recovery rates for the IBC IWT 119-MAX are based on a boiler flow of 25 gpm and entering cold water at 58 degrees Fahrenheit:

Step 1. Drain the domestic water system by shutting off the cold water supply at the main shutoff valve, opening faucets to relieve pressure, and opening the system drain while leaving faucets open.

Step 2. Position the water heater and install piping onto the cold inlet connection. Suggested components include a union, heat trap, shut-off valve, drain valve, expansion tank, back flow preventer, and vacuum breaker.

Step 3. Connect the domestic hot water piping to the hot water supply connection using a union, heat trap, and shut-off valve.

Step 4. Pipe the relief valve discharge so it exits within 6 inches above a suitable drain. Ensure the opening is not blocked or reduced in size.

Step 5. Fill the IBC IWT 119-MAX tank by opening all faucets to purge air and removing faucet screens. Open the domestic hot water shut-off valve and slowly open the cold water inlet shut-off valve. Purge all air from the system and allow water to run clear to remove any debris from the tank.

Step 6. Close all faucets, reinstall faucet screens, and check the system for leaks.

Regular maintenance is necessary for the optimal operation of the IBC IWT 119-MAX:

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

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

Sediment: Annually (or more frequently in hard water areas), check for sediment buildup. Levels requiring service are indicated by reduced recovery rates. Draw water from the drain valve until it runs clear.

Scale: Annually check for scale buildup on the heating coil. If repeated flushing does not resolve issues, chemical cleaning may be required.

Step 1. Shut off the cold water supply to the IBC IWT 119-MAX.

Step 2. Note the DHW temperature control setting and turn off power to the boiler and water heater.

Step 3. Open a hot water faucet to reduce tank pressure.

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

Step 5. Drain the tank until it is two-thirds full, ensuring the water level still covers the coil and thermostat well.

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

Step 7. Turn on power to the boiler and water heater and program the control to its highest DHW temperature setting.

Step 8. Heat the water until the control is satisfied. If not satisfied after 45 minutes, set the control to its lowest temperature.

Step 9. Allow the solution to set for 30 minutes, then drain the tank completely.

Step 10. Refill with fresh water and drain completely at least three times to flush the solution.

Step 11. Reinstall the relief valve and drain piping, open the cold water supply, fill the tank, and purge air by opening faucets.

If there is no hot water, follow these troubleshooting steps for the IBC IWT 119-MAX:

If the boiler does not operate: Ensure boiler power is on. Ensure the boiler is programmed correctly for DHW and water temperatures are set properly. Check the IBC screen for sensor or wiring issues (Open or Short).

If the water heater circulator does not operate: Ensure the pump relay is closed and supplying power. Ensure the zone valve is open and the end switch is closed. Check wiring connections at the circulator and measure voltage (should be 120VAC during a call for heat). Replace circulator if power is present but it fails to run.

If the water heater zone valve does not open: Check for 24VAC at the valve during a call for heat. Replace the zone valve if power is available but it does not open.

If the tank sensor is mis-wired: Ensure the sensor is connected to the correct terminals. Disconnect sensor wires and measure resistance in Ohms, comparing it to the standard temperature/resistance chart.

The IBC IWT 119-MAX requires the following minimum clearances from combustibles and for service access:

Front: 1 inch from combustibles; 24 inches for service.

Rear, Right and Left Sides: 1 inch from combustibles; 1 inch for service.

Top: 1 inch from combustibles; 1 inch for service.

Bottom: 0 inches from combustibles; 0 inches for service.

If installed on carpet, the unit must be installed on a metal or wood panel extending at least 3 inches beyond the full width and depth of the appliance in any direction.

The following dimension references and sizes apply to the IBC IWT 119-MAX:

Connection types for the IBC IWT 119-MAX:

T&P Relief valve: 1 inch F NPT

Hot water outlet: 1.5 inch M NPT

In from boiler (boiler supply): 1.5 inch M NPT

Out to boiler (boiler return): 1.5 inch M NPT

Tank drain: 0.5 inch F NPT

Cold water inlet: 1.5 inch M NPT

Key operational terms and recommended settings for the IBC IWT 119-MAX include:

DHW Tank SetPoint: The temperature at the faucet. Recommended no higher than 140 degrees Fahrenheit to prevent scalding.

Tank Diff’l Temp: The variance the control allows in the set point. A setting of 10 degrees Fahrenheit is recommended.

Maximum Supply Temp: The highest DHW supply set point the boiler will allow. It should be at least 30 degrees Fahrenheit higher than the DHW supply set point temperature.

Supply Diff’l Temp: The variance for the supply set point. A trial setting of 20 degrees Fahrenheit is suggested; increase this if short-cycling occurs.