Patterson-Kelley MOD-04 ユーザーズマニュアル

 6 

 

 

 

If the boiler is to be installed near combustible sur-
faces, the minimum clearances shown in the table be-
low must be maintained.   

Failure to provide for the service access clearances, 
even with non-combustible surfaces, may cause future 
problems servicing the boiler.   

The boiler must be installed in a space large in com-
parison to the boiler as described in Section 6.3 of the 
National Fuel Gas Code, ANSI Z223.1, latest edition. 

 

A

B

C

No pipes, 
ducts, etc.
in this area.

 

 

D

D

 

 

 

 

Dimensions (inches) 

Type of Surface 

A B C† D 

Combustible 

Surfaces 

30 24 30  24 

Non-combustible Sur-
faces 

30 24* 30 24** 

 

† "C" dimension includes clearance to remove the 
burner.  Do not put pipes, ducts, etc. in this area above 
the boiler.  

* CSA minimum.  Actual clearance depends upon 
stacking requirements. 

** Service access need be only on one side of a boiler 
or row of boilers.  Boilers may be installed immedi-
ately adjacent to each other.  However, P-K recom-
mends this clearance between each boiler when there 
is insufficient access at the rear to allow for service 
and adjustment. 
 
In Canada: The boilers are approved for installation 
with zero clearance to combustible surfaces, but 24 
inch service clearances are recommended. 

 

All field wiring connections for power and control are 
in the rear service panel on the back of the boiler.  
Low voltage and high voltage terminal strips are indi-
cated on the wiring diagram.  The boiler power circuit 

Back of 

Boiler 

Front of 

Boiler