P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 10
2.4.2 Clearances
If the boiler is to be installed near combustible surfaces, the minimum clearances shown in the table
and illustration below must be maintained. Failure to provide for service access clearances, even with
non-combustible surfaces, may cause future problems servicing the boiler. Maintain a clearance from
the vent to combustible surfaces of 24” or as specified by vent manufacturer’s installation instructions.
The boiler must be installed in a space large enough in comparison to the boiler as described in the
National Fuel Gas Code, ANSI Z223.1, latest edition.
Type of Surface
Dimensions (inches)
A
B
C
D
Combustible Surfaces Minimum Clearances
18
6*
12†
6*
Clearance to Non-Combustible Surfaces
0
0
0
0
Recommended Clearances for Service Access
30
12**
12†
18**
* “B” Clearance depends upon exhaust vent configuration.
† “C” Space required for pipes, ducts, etc. in this area above the boiler.
** Do not put pipes, ducts, vents, etc. in this space. Electrical conduit must be installed
vertically so that the side doors can be opened.
Note:
Failure to provide recommended service clearances may make it difficult to perform service
on the boiler(s).
