LAARS EDN Series - Installation, Operation and Maintenance Instructions - Manual (Page 3)

Endurance Page 3
SECTION 1.
General Information
1.1 Introduction
EBP - This appliance is a low pressure, direct
vent, hot water boiler that provides priority domestic
hot water on demand as well as hydronic space heating
system. The unit has a twenty gallon tank which holds
boiler water (and is not domestic water storage).
The boiler water is kept hot at all times to
provide immediate response to call for heat or
domestic water. Domestic water is heated by the boiler
water through a stainless steel plate heat exchanger.
EDP/EDN - This appliance is a low pressure,
direct vent, cold start hot water boiler that provides
heat for hydronic space heating.
Both appliances incorporate a circulating pump
and a bypass loop, and provide circulation for the
heating system and adequate flow for its own needs.
It may be necessary to install a system circulator to
achieve the required flow rate through the system.
Both appliances feature a forced draft, premixed
combustion system. All air for combustion is supplied
with the gas to the burner (flame holder). Both the
Figure 1. Combo Heating/Domestic Water (Model EBP).
intake air and the gas are metered through separate
orifices before entering the combustion air blower. The
blower forces the air/fuel mixture through the flame
holder and into the combustion chamber. The mixture
is ignited from the hot surface ignitor and burns. Hot
gases are forced out between the passes of the heat
exchanger into the flue collector. Flue gases are
discharged into the outside atmosphere through the
vent terminal.
The appliance can operate with a concentric vent
system that will provide outside air for combustion.
Other venting arrangements can be provided for the
appliance to include an alternative 50 equivalent feet
maximum horizontal or condensate trapped vertical
vent.
1.2 Codes and Standards
The Endurance may be a direct vent or Category
IV Boiler. All installations must be made in
accordance with:
1.
The National Fuel Gas Code, ANSI Z223.1 latest
edition, or.
2. CAN/CGA B149 “Installation Codes for Gas
Burning appliances and Equipment” and with the
requirements of the local utility or other
authorities having jurisdiction. Such application
requirements take precedence over the general
instructions contained herein.
All electrical wiring is to be done in accordance with:.
1.
The National Electrical Code ANSI / NFPA70
latest edition or
Figure 2. Heating Unit (Model EDP/EDN).