Lochinvar 751 - 2001 사용자 설명서

        

Installation & Operation Manual

1.  Combustion Air Intake Connector (FIG. 2-1) - Used to 
 

provide combustion air directly to the unit from outdoors.  

 

A fitting is provided with the unit for final connection.  

 

Combustion air piping must be supported per guidelines 

 

listed in the National Mechanical Code, Section 305, Table 

 

305.4 or as local codes dictate.

2.  Vent Connector (FIG. 2-1) -  Used to provide a 
 

passageway for conveying combustion gases to the 

 

outside.  A transition fitting is provided on the unit for 

 

final connection.  Vent piping must be supported per the 

 

National Building Code, Section 305, Table 305.4 or as 

 

local codes dictate.

IMG01034

ROOM AIR BOX
SHIPPED WITH
UNIT

                AIR PIPE
(FIELD SUPPLIED)

            VENT PIPE
(FIELD SUPPLIED)

CONNECTOR SIZED FOR STAINLESS STEEL 
FLUE PIPE

The Crest is certified as a Category II/IV boiler.  This product 
has been approved for use with stainless steel vent systems.  
All venting systems used with a Crest boiler must be suitable 
for Category IV operation except for factory approved 
common vent systems operating as allowed in the Common 
Venting Section on page 19.

 WARNING

When a sidewall or vertical rooftop combustion air supply 
system is disconnected for any reason, the air inlet pipe 
must be resealed to ensure that combustion air will be free of 
contaminants and supplied in proper volume.

 DANGER

Failure to properly seal all joints and seams 
as required in the air inlet piping may 
result in flue gas recirculation, spillage 
of flue products and carbon monoxide 
emissions causing severe personal injury 
or death.

The Crest uses model specific combustion air intake and vent 
piping sizes as detailed in Tables 2B and 2C on page 17.

Increasing or decreasing combustion air 
or vent piping to sizes not specified in this 
manual is not authorized.

Use only the materials, vent systems, 
and terminations listed in Table 2A-1. 

 

DO NOT mix vent systems of different 
types or manufacturers, unless listed in 
this manual.  Failure to comply could 
result in severe personal injury, death, or 
substantial property damage.

Installations must comply with applicable 
national, state, and local codes.  Stainless 
steel vent systems must be listed as a 

 

 

 

 

 

UL-1738 approved system for the United 
States and a ULC-S636 approved system 
for Canada. 

Installation of a stainless steel vent system 
should adhere to the stainless steel vent 
manufacturer’s installation instructions 
supplied with the vent system.

 

The Crest is supplied with an integral 
FasNSeal vent connector (FIG. 2-1).  The 
installer must use a specific vent starter 
adapter supplied by the vent manufacturer 
to adapt to different vent systems.

ProTech Systems (Dura-Vent Co.)

FasNSeal Vent

Z-Flex (Nova Flex Group)

Z-Vent

Heat Fab (Selkirk Corporation)

Saf-T Vent

Metal Fab

Corr/Guard

Securities Chimneys International

Secure Seal SS

Schebler Chimney Systems

eVent

ICC

VIC

Jeremias

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