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420012001500 - 03182024 - Rev. 04
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, NTI 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 firing 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
with this boiler.
This boiler does not include a standing pilot.
This boiler is designed and shipped to assure the highest efficiency
operation possible. Such high efficiency 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 specific
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.
ASME CSD-1, Section CW-400 requires the temperature controls of
hot water heating boilers to
a) be accepted by a nationally recognized testing agency to conform
to UL 353,
b) shutoff the fuel supply when the system water reaches a preset
operating temperature,
c) have a high temperature limit control that prevents the water
temperature from exceeding the maximum allowable temperature by
causing safety shutdown and lockout.
The temperature controls of this boiler have been accepted by a
nationally recognized testing agency to conform to UL 353; they
work to shutoff the fuel supply when the system water temperature
reaches the preset operating temperature; and they cause a safety
shutdown and lockout, requiring a manual reset to start, when the
water temperature reaches 212°F.
WARNING
NOTICE
NOTICE
An ASSE 1017 or ASSE 1070 temperature limiting or mixing valve
is required in all combi boiler installations. Failure to install a
temperature limiting or mixing valve will result in property damage,
severe personal injury, or death due to scalds.
DANGER
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