Boiler Piping
Additional Limit Control
If a separate LWCO device is required by cer-
tain local jurisdictions or when the boiler is
installed above the system piping, the follow-
ing guidelines must be followed:
- The LWCO device must be designed
for water installations, electrode probe-
type is recommended.
- The LWCO device must be installed in
a tee connection on the boiler supply
piping above the boiler.
- Wiring of the LWCO device to the PRES-
TIGE Solo is done directly onto the low
voltage terminal strip, reference Fig. 19
page 31 for available terminals for an
external limit (manual or auto reset).
If the installation is to comply with ASME or
Canadian requirements, an additional high
temperature limit may be needed. Consult
local code requirements to determine compli-
ance. The limit should be installed as follows:
- Install the limit in the boiler supply pip-
ing between the boiler and any isolation
valve.
- Maximum set point for the limit is
194ºF.
- For wiring of the limit reference Fig. 19,
page 31, using the external limit/manual
reset terminals on the low voltage termi-
nal strip. This will provide a "hard"
lockout requiring a manual reset of the
control.
Backflow Preventer
- Use a backflow preventer valve in the
make-up water supply to the unit as
required by local codes.
Boiler System Piping Applications
It is recommended on all piping applica-
tions to utilize a primary/secondary piping
arrangement as a means to provide freeze
protection of the boiler, which is an integral
function of the boiler control. Maintain the
minimum boiler flow rate, see Graphs 2
through 7 on pages 91 through 93. For
other piping arrangements, consult the
Engineering Department at Triangle Tube
or consult other approved/recognized
design arrangements.
On piping applications utilizing a single
zone or other recognized piping design
arrangements, it is recommended that the
installer uses flow/check valves with
weighted seats at or near the appliance to
prevent gravity circulation.
Expansion Tank and Makeup Water
Ensure the expansion tank is properly sized for
the boiler volume (3 gallons [12 L] for the
PRESTIGE Solo 60, 5 gallons [19 L] for the
PRESTIGE Solo 175/250, 7 gallons [26 L] for
PRESTIGE Solo 399) and the system volume
and temperature.
Undersized expansion tanks will cause
system water to be lost through the pres-
sure relief valve and cause additional
makeup water to be added to the system.
Eventual boiler heat exchanger failure
can result due to this excessive makeup
water addition.
The expansion tank must be located as shown
in Fig. 7 and Fig. 8 on page 19 when using a
primary/secondary piping arrangement or as
per recognized design methods. Refer to the
expansion tank manufacturer instructions for
additional installation details.
CAUTION
BEST PRACTICE
BEST PRACTICE
16
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