Air Elimination Device; Low Water Cut-Off (Field Supplied); Applications - NTI TRX II Series Installation Start-Up Maintenance

WARNING
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.
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
• Caleffi 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-off may be required by local codes. This is
to be remote-mounted and field supplied. See Figure 12 for basic Low
Water Cut-Off installation instructions. Do not install an isolation valve
between boiler and low water cut-off.
When wiring the low water cut-off follow the installation instructions
provided by the low water cut-off manufacturer.
NOTE: During a low water condition, the field supplied low water cut-
off 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-off and will result in damage to the boiler. Such damages
are not covered by boiler warranty.
Air Vent
LWCO
Boiler Below Radiation
Boiler with Low Water Cut-Off
Not included (Remote-Mounted and Field Supplied)
Figure 13 - Low Water Cut-Off Basic Installation
TRX Series 2 - Installation - Startup - Maintenance Instructions
Air Vent
LWCO
Boiler Above Radiation
J. Applications*
CAUTION
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
backflow
preventor
pressure
reducing valve
flow-check
valve
circuit
setter
Figure 14 - Piping Symbol Legend
Part 4 - Water Piping
Symbol
Description
check valve
pressure and
temperature
relief valve
zone valve
auto air vent
circulator
w/isolation
flanges
strainer
ball
valve
drain valve
25