lp-666 Rev. 003 Rel. 001 Date 2.25.20
4
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 928 control
provided with this heating appliance complies with the requirements
of CSD-1 Section CW-400 as a temperature operation control. The
control monitors the temperature dierence between the inlet
and the outlet sensor, which is aected by boiler water ow. If this
temperature dierence 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 dierence exceeds 60°F, the control will
eectively sense there is little or no water ow or heat load and shut
the boiler down. The controller will restart automatically once the
temperature dierence 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.
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 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 HTP with this boiler.
• This boiler does not include a standing pilot.
• This boiler is designed and shipped to assure the highest
eciency operation possible. Such high eciency 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
specic 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 5
A. Improper Combustion 6
B. Gas 6
C. When Servicing the Boiler 6
D. Boiler Water 6
E. Freeze Protection 6
F. High Elevation Installations 6
Part 2 - Before You Start 6
A. What’s in the Box 6
B. How the Boiler Operates 6
C. Optional Equipment 7
Part 3 - Prepare the Boiler 8
A. Locating the Boiler 8
B. Flooring 9
C. Leveling 9
D. Clearances for Service Access 10
E. Residential Garage and Closet Installations 10
F. Exhaust Vent and Intake Pipe 10
1. Direct Vent of Exhaust and Intake 10
2. Power Venting, Indoor Combustion Air in Conned or Unconned
Space 11
G. Carbon Monoxide Detectors 11
H. Prevent Combustion Air Contamination 12
I. Removing a Boiler from a Common Vent System 12
J. Water Chemistry Requirements* 12
K. Technical Specications 15
Part 4 - Piping 16
A. General Plumbing Information 16
B. Relief Valve 16
C. Backow Preventer 16
D. Expansion Tank 16
E. Circulators 17
F. Hydronic Piping with Circulators, Zone Valves, and Multiple
Boilers 17
G. Circulator Sizing 18
H. Check / Control Water Chemistry 19
I. Plumbing 19
J. Fill and Purge Heating System 19
K. Freeze Protection Fluids 19
L. Zoning with Zone Valves 20
M. Zoning with Circulators 20
N. Multiple Boilers 20
O. Applications* 21
Part 5 - Venting 22
A. General 22
B. Approved Materials for Exhaust Vent and Intake Pipe 23
C. Additional Requirements for Installation in Canada 23
D. Exhaust Vent and Intake Pipe Location 24
E. Exhaust Vent and Intake Pipe Sizing 25
F. Exhaust Vent and Intake Pipe Installation 25
G. Applications 26
1. Direct Vent Installation of Exhaust and Intake 26
2. Power Venting, Room and Indoor Combustion Ventilation
Requirements 28
Part 6 - Condensate Removal 29
Part 7 - Wiring - 400 - 1500 Models 30
A. Installation Must Comply With 30
B. Field Wiring 30
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