Patterson-Kelley MOD-04 ユーザーズマニュアル

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The vent must be provided with a weather cap of ap-
proved design and adequate capacity. 

 

3.6.6  Removing an Existing Boiler  
(from a common venting system) 

When an existing boiler is removed from a common 
venting system, the common venting system is likely 
to be too large for proper venting of the appliances 
remaining connected to it. 

At the time of removal of an existing boiler, while the 
other appliances remaining connected to the common 
venting system are not in operation, the following 
steps should be followed with each appliance remain-
ing connected to the common venting system placed in 
operation: 

1.  Seal any unused openings in the common venting 

system. 

2.  Visually inspect the venting system for proper size 

and horizontal pitch and determine that there is no 
blockage or restriction, leakage, corrosion or other 
deficiency which could cause an unsafe condition. 

3.  Insofar as is practical, close all building doors and 

windows and all doors between the space in which 
the appliances remaining connected to the com-
mon venting system are located and other spaces 
of the building.  Turn on clothes dryers and any 
appliances not connected to the common venting 
system.  Turn on any exhaust fans, such as range 
hoods and bathroom exhausts, so they will operate 
at maximum speed.  Do not operate a summer ex-
haust fan.  Close fireplace dampers. 

4.  Place the appliance being inspected in operation. 

Follow the lighting instructions.  Adjust the ther-
mostat so that the appliance will operate continu-
ously. 

5.  Test for spillage at the draft hood relief opening 

after 5 minutes of main burner operation.  Use the 
flame of a match or candle or smoke from a ciga-
rette, cigar or pipe. 

6.  After it has been determined that each appliance 

remaining connected to the common venting sys-
tem properly vents when tested as outlined above, 
return doors, windows, exhaust fans, fireplace 
dampers, and any other gas-burning appliance to 
their previous conditions of use. 

 

 
Any improper operation of the common venting sys-
tem should be corrected so the installation conforms 
with the National Fuel Gas Code, ANSI Z223.1.  
When resizing any portion of the common venting sys-
tem, the common venting system should be resized to 
approach the minimum size as determined using the 
appropriate tables in Part II in the National Fuel Gas 
Code, ANSI Z223.1. 

 

Before making the gas hook-up, make sure the boiler 
is being supplied with the type of fuel shown on the 
boiler nameplate. 

The boiler shall be installed such that the gas ignition 
system components are protected from water (drip-
ping, spraying, rain, etc.) during appliance operation 
and service (circulator replacement, control replace-
ment, etc.) 

The gas train components are designed to handle a 
maximum inlet pressure of 14 inches water column 
(1/2 psig.).  If the available gas pressure exceeds 14 
inch w.c., a suitable additional intermediate gas pres-
sure regulator of the "lock up" type must be provided 
to reduce the pressure to less than 14 inch w.c.  
 

 

Correct Listed 

Termination 

Incorrect 

 Termination 

(too restrictive)