HTP 399M User Manual

Page 4

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NOTE: The gas manifold and controls met safe lighting and other performance criteria when undergoing tests specified in ANSI
Z21.10.3

– latest edition.

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, HTP, Inc. 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 by HTP, Inc. 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.



This boiler is equipped with a tankless coil.

TABLE OF CONTENTS

PART 1

– GENERAL SAFETY INFORMATION .......................................................................................................................... 7

A. PRECAUTIONS .......................................................................................................................................................................... 7