CleaverBrooks ClearFire CFH, Operation, Service And Parts Manual, Page: 22 / 120

Chapter 2 — Installation
2-8 Part No. 750-295
Gas Header - For multiple unit installations, a single common gas header is recommended with individual
takeoffs for each boiler (See Figure 2-7 ). Boiler gas manifold piping should be sized based on volume
requirements and lengths between each boiler and the fuel main header. Table 2-4 indicates the proper
sizing for multiple units of equal size (assuming < 1 psig supply pressure), placed on the factory standard
center with the indicated take off size. For installations with a mixed sized use, determine the flow of each
unit and total the input. With the total input, find length of run from the source and determine what size
header will be needed for the flow of all units firing. Pipe sizes are based on
Table 2-2 with boiler gas line
take-off at 20 feet from the header.
For systems with 1 psig or greater supply pressure, the gas supply header piping should be sized for not
more than 1/2 psi drop at 100% installed capacity.
Figure 2-7 Typical gas header piping
Regulator
Header Pipe
Meter
From
Gas Strainer
Relief Valve
See Note 5
See Note 1
NOTES:
1. Upstream regulator required if supply pressure >1 psig.
2. Refer to local fuel gas codes when applicable.
3. Header to be sized for room capacity.
4. Provision required for measuring gas supply pressure at boiler.
5. Relief valve required if gas supply pressure >1 psig.
Manual Shut Off
Model CFH Model CFH Model CFH Model CFH