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14
Part 4 - Piping
Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, severe personal
injury, or death.
The National Standard Plumbing Code, the National Plumbing
Code of Canada, and the Uniform Plumbing Code limit heat
transfer fluid pressure to less than the minimum working
pressure of the potable water system up to 30 PSI maximum.
In addition, the heat transfer fluid must be water or another
non-toxic fluid having a toxicity of Class 1, as listed in Clinical
Toxicology of Commercial Products, 5th Edition. Failure to
follow this warning could result in property damage, severe
personal injury, or death.
Dielectric unions or galvanized steel fittings must not be used
in a system with this boiler. Doing so WILL VOID the warranty.
Use only copper, brass, or stainless steel fittings. Teflon thread
sealant must be used on all connections.
Plumbing of this product should only be done by a qualified,
licensed plumber in accordance with all local plumbing codes.
The boiler may be connected to an indirect water heater to
supply domestic hot water. Westinghouse offers indirect water
heaters in a wide range of gallon sizes in either stainless steel or
glass-lined construction.
A. General Plumbing Information
The building piping system must meet or exceed the the piping
requirements in this manual.
Use two wrenches when tightening water piping at boiler. Use
one wrench to prevent the boiler return or supply line from
turning. Failure to prevent piping connections from turning
could cause damage to boiler components.
The control module uses temperature sensors to provide both
high limit protection and modulating temperature control. The
control module may also provide low water protection (through
the addition of an optional kit) by sensing the water level in the
heat exchanger. An optional flow switch may be installed on the
supply of the system to activate the boiler when there is enough
flow. Some codes/jurisdictions may require additional external
controls.
NOTE: The addition of a high temperature limiting device is
important if the boiler is to be connected to a domestic hot
water system.
B. Relief Valve
Connect discharge piping to a safe disposal location following
the guidelines below.
To avoid water damage or scalding due to relief valve operation:
•
Discharge line must be connected to relief valve outlet
and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility of
severe burns or property damage should the relief valve
discharge.
WHL-052 Rev. 4.28.16
•
Discharge line must be as short as possible and
the same size as the valve discharge connection
throughout its entire length.
•
Discharge line must pitch downward from the valve
and terminate at least 6" above the floor drain, making
discharge clearly visible.
•
The discharge line shall terminate plain, not threaded,
with a material serviceable for temperatures of 375
or greater.
•
Do not pipe discharge to any location where freezing
could occur.
•
No valve may be installed between the relief valve and
boiler or in the discharge line. Do not plug or place any
obstruction in the discharge line.
•
Test the operation of the relief valve after filling and
pressurizing the system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to operate
correctly, immediately replace with a new properly
rated relief valve.
•
Test T&P valve at least once annually to ensure the
waterway is clear. If valve does not operate, turn the
boiler "off" and call a plumber immediately.
•
Take care whenever operating relief valve to avoid
scalding injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES
COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY
DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
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 T&P RELIEF VALVES: T&P valves
should be inspected AT LEAST ONCE EVERY THREE
YEARS, and replaced if necessary, by a licensed plumbing
contractor or qualified service technician to ensure that the
product has not been affected 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 T&P VALVE AS DIRECTED
COULD RESULT IN UNSAFE TEMPERATURE AND/OR
PRESSURE BUILD-UP WHICH CAN RESULT IN PROPERTY
DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH.
C. Backflow Preventer
Use a backflow preventer specifically designed for hydronic
boiler installations. This valve should be installed on the cold
water fill supply line per local codes.
All piping methods shown in this manual use primary/
secondary connection to the boiler loop. This is to avoid the
possibility of inadequate flow through the boiler. For other
piping methods, consult your Westinghouse representative.
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