NTI INSTALLATION MANUALS

Part 4 - Water Piping

G. Air Elimination Device A micro bubble air elimination device must be installed in every boiler installation. Automatic air vents alone are not an acceptable substitute for a micro bubble air elimination device. Here are a few examples of acceptable devices. • Spirovent • TACO 4900 Series • Cale Discal H. Low Water Cut-Off (Field Supplied) This boiler is provided with a factory installed Water Pressure Switch. In the event water pressure drops below 7 PSI, the control will go to a blocking error “FILL - 108”, inhibiting burner operation. However, a low water cut-o may be required by local codes. This is to be remote-mounted and eld supplied. See Figure 12 for basic Low Water Cut-O installation instructions. Do not install an isolation valve between boiler and low water cut-o . When wiring the low water cut-o follow the installation instructions provided by the low water cut-o manufacturer. NOTE: During a low water condition, the eld supplied low water cut-o normally open contacts must break the main power supply to the boiler. Failure to follow this instruction will defeat the purpose of a low water cut o and will result in damage to the boiler. Such damages are not covered by boiler warranty.

Figure 12 - Low Water Cut-Off Basic Installation

I. Applications*

In mixed temperature applications, mixing valves are required for the protection of low temperature loops. CAUTION

Figure 13 - Piping Symbol Legend

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