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TRX Series II - Installation - Startup - Maintenance Instructions
J. Applications*
H. Air Elimination Device
I. Low Water Cut-Off (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
• Caleffi Discal
In mixed temperature applications, a mixing valve is required for the
protection of low temperature loops.
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.
CAUTION
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 21 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.
Boiler Below Radiation
LWCO
Air Vent Air Vent
LWCO
Boiler with Low Water Cut-Off
Not included (Remote-Mounted and Field Supplied)
Boiler Above Radiation
Figure 21 - Low Water Cut-Off Basic Installation
Part 4 - Water Piping
WARNING
Figure 22 - Piping Symbol Legend
Legend
Symbol
Description
Symbol
Description
Central air
seperator
check valve
Temp/press
gauge
pressure and
temperature
relief valve
expansion
tank
zone valve
backflow
preventor
auto air vent
circulator
w/isolation
flanges
pressure
reducing valve
strainer
flow-check
valve
ball
valve
circuit
setter
drain valve
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