NTI INSTALLATION MANUALS

Part 4 - Water Piping

WARNING

J. Applications*

CAUTION

H. Air Elimination Device I. Low Water Cut-O (Field Supplied) 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 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 21 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. Do not thread a cap or plug into the relief valve or relief valve line under any circumstances! Explosion and property damage, serious injury, or death may result. RE-INSPECTION OF RELIEF VALVES: Relief valves should be inspected AT LEAST ONCE EVERY THREE YEARS, and replaced if necessary, by a licensed plumbing contractor or quali ed service technician to ensure that the product has not been a ected by corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally. Certain naturally occuring conditions may corrode the valve and its components over time, rendering the valve inoperative. Such conditions can only be detected if the valve and its components are physically removed and inspected. Do not attempt to conduct an inspection on your own. Contact your plumbing contractor for a re inspection to assure continued safety. FAILURE TO RE-INSPECT THE RELIEF VALVE AS DIRECTED COULD RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD-UP WHICH CAN RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH.

In mixed temperature applications, a mixing valve is required for the protection of low temperature loops.

LEGEND

Symbol

Description

central air seperator

temp/press gauge

expansion tank

back ow preventor

isolation valve

circulator w/ isolation anges

pressure reducing valve

pressure relief valve

check valve

union

strainer

Air Vent

Air Vent

zone valve

LWCO

LWCO

pressure and temperature valve

auto air vent

zone load

drain valve

Boiler Above Radiation

Boiler Below Radiation

Figure 22 - Piping Symbol Legend

Boiler with Low Water Cut-O ff Not included (Remote-Mounted and Field Supplied)

Figure 21 - Low Water Cut-O Basic Installation

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