WHL-038 Rev. 1.29.16
15
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.
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.
A. General Plumbing Information
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 building piping system must meet or exceed the piping
requirements in this manual.
NOTE:
The addition of a high temperature limiting device is
important if the boiler is to be connected to a domestic hot
water system.
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 either stainless steel or glass-lined construction.
The control module uses temperature sensors to provide both
high limit protection and modulating temperature control.
The control module also provides low water protection by
sensing the water level in the heat exchanger. Some codes/
jurisdictions may require additional external controls..
B. Relief Valve
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.
•
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
o
F
or greater.
Connect discharge piping to a safe disposal location by
following these guidelines.
RE-INSPECTION OF RELIEF VALVES: 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.
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.
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.
•
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 relief 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.
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 in this manual use primary / secondary
connections to the boiler loop. This is to avoid the possibility of
inadequate flow through the boiler. For other piping methods,
consult your local Westinghouse representative or refer to
Applications in this manual.
D. Expansion Tank
Expansion Tank and Make-Up Water
1. Ensure that the expansion tank is sized to correctly handle
boiler and system water volume and temperature.