Warranty

4
whl-648 Rev. 000 Rel. 009 Date 1.4.19
The hydronic supply and return connections of these products
are for installation in closed loop systems ONLY! Use of this
product in any manner other than described in this manual may
result in premature product failure, substantial property damage,
severe personal injury, or death. Damage or failure of this product
(or the system in which it is installed) due to unauthorized use IS
NOT COVERED BY WARRANTY.
IMPORTANT
In accordance with Section 325 (f) (3) of the Energy Policy and
Conservation Act, Westinghouse has provided this boiler with
multiple features designed to save energy by reducing the
boiler water temperature as heating load decreases.
These features include:
• A modulating combustion system that adjusts ring rate
based on heat demand.
• Adjustment of boiler set point based on inferred heat
load as determined by an outdoor sensor. The outdoor
sensor is supplied by Westinghouse with this boiler.
• This boiler does not include a standing pilot.
• This boiler is designed and shipped to assure the highest
eciency operation possible. Such high eciency is
achieved by limiting heating circuit water temperature to
140°F when there is no anticipated heat load, based upon
the outdoor sensor and the Outdoor Reset Curve (sensor
response curve) in the boiler software.
• This feature may be over-ridden as described below in
specic installations:
• The boiler control is equipped with an outdoor sensor
override for use with building management systems or in
cascaded systems (for systems with total input of 300,000
BTU/hr or greater).
See statement below for an important notice on the use of the
override.
IMPORTANT
In accordance with Section 325 (f) (3) of the Energy Policy and
Conservation Act, this boiler is equipped with a feature that
saves energy by reducing the boiler water temperature as
the heating load decreases. This feature is equipped with an
override which is provided primarily to permit the use of an
external energy management system that serves the same
function. THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST
ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that
reduces the boiler water temperature as the heating load
decreases.
• This boiler is not used for space heating.
• This boiler is part of a modular or multiple boiler system
having a total input of 300,000 BTU/hr or greater.
• This boiler is equipped with a tankless coil.
The CSD-1 ASME Code, Section CW-400 requires that hot water
heating and supply boilers have a) a UL 353 temperature control
device, b) at least one (1) temperature-actuated control to shut
o the fuel supply when system water reaches a preset operating
temperature, c) a high temperature limit control that prevents
the water temperature from exceeding the maximum allowable
temperature by causing a safety shutdown and lockout, and d) its
own sensing element and operating switch.
The temperature control system integrated into the 926 control
provided with this heating boiler complies with the requirements
of CSD-1 Section CW-400 as a temperature operation control.
The control monitors the temperature dierence between the
inlet and the outlet sensor, which is aected by boiler water ow.
If this temperature dierence exceeds 55°F (typically because of
low water ow or very low heat load), the control will reduce the
maximum fan speed. If the temperature dierence exceeds 60°F,
the control will eectively sense there is little or no water ow
or heat load and shut the boiler down. The controller will restart
automatically once the temperature dierence has dropped below
55°F and the minimum o time (anti-cycle time) has expired. In
addition, if the control senses that the outlet water temperature
has reached 210°F, the boiler is put into a hard lockout and requires
manual reset to restart.
Protection From Damage
1. Boilers generating a glow, spark or ame capable of igniting
ammable vapors may be installed in a garage, provided the
pilots, burners or heating elements and switches are at least
eighteen (18) inches (457 mm) above the oor level.
2. Where such boilers installed within a garage are enclosed in a
separate, approved compartment having access only from outside
of the garage, such boilers may be installed at oor level provided
the required combustion air is also taken from the exterior of the
garage. Fuel burning boilers having sealed combustion chambers
need not be elevated.
3. All boilers installed in areas where they may be subjected
to mechanical damage shall be suitably guarded against such
damage by being installed behind adequate barriers or by being
elevated or located out of the normal path of a vehicle using any
such garage.
4. In seismic zones 3 and 4, boilers shall be anchored or strapped
to resist horizontal displacement due to earthquake motion.
Strapping shall be at points within the upper one-third (1/3)
and lower one-third (1/3) of its vertical dimensions. At the lower
point, a minimum distance of four (4) inches (102 mm) shall be
maintained above the controls with the strapping.
5. An boiler supported from the ground shall rest on level concrete
or other approved base extending not less than three (3) inches
(76 mm) above the adjoining ground level.
6. Any boiler should be installed in such a manner that if it should
leak the resulting ow of water will not cause damage to the area
in which it is installed. If the boiler is installed in a location where
a leak could cause damage, it is required to provide containment
measures.