LAARS EDN Series - Installation, Operation and Maintenance Instructions User Manual

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Endurance

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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. The unit has a twenty gallon tank which holds

boiler water (as opposed to 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. The model number

structure is shown in Figure 3.

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

Figure 1. Combo Heating/Domestic Water (Model EBP).

with the gas to the burner (flame holder). Both the

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:

a. The National Fuel Gas Code, ANSI Z223.1/

NFPA 54 latest edition, or

b. CSA B149.1 Natural Gas and Propane

Installation Code.

c. The requirements of the local utility or other

authorities having jurisdiction take precedence

over the general instructions contained herein.

All electrical wiring is to be done in accordance with:.

a. The National Electrical Code (NFPA 70), latest

edition or

Figure 2. Heating Unit (Model EDP/EDN).

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