Full Product Manual

15
4.0 Boiler Piping
4.4 Low Water Cutoff Device
- The PRESTIGE Excellence is equipped with
a factory installed pressure sensor type Low
Water Cut Off device.
- The minimum operating system pressure
allowable with this device is 10 psig.
- Check local codes if a Low Water Cutoff
Device is required. If so, determine if this
device meets the requirements of the local
codes.
The PRESTIGE Excellence control sys-
tem also senses the water temperatures
entering and exiting the heat exchanger
to provide protection against low water
conditions. Where local codes and juris-
diction do not accept a pressure device
for low water protection, the jurisdic-
tions may accept these PRESTIGE
Excellence integral control functions as a
means of providing low water protection.
4.5 Additional Limit Control
If a separate LWCO device is required by the
local jurisdiction or when the boiler is installed
above the system piping, the following guide-
lines 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 Excellence is done directly onto the
low voltage terminal strip, reference Fig.
15 page 29 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.
NOTICE
Fig. 5: Pressure Relief Valve and Boiler Drain Valve Installation