39
CL3
Series
3.0
Installation
•
Installation of the Gas Line to the Heater
Refer to Chart 3.7 for natural gas and Chart 3.8 for propane gas to determine the cubic feet per hour (CFH)
required for the type of gas and size of unit to be installed. To determine the proper pipe diameter, use the
CFH value and the length of pipe necessary from Chart 3.8. In the case where several units are serviced
by the same main gas line, the total capacity (CFH) and length of main must be adequate to service all
appliances downstream of this main.
Chart 3.7
•
Natural Gas Consumption
* Assumes an average heating value of 1,050 BTU/SCF and a Specific Gravity of 0.60.
Model
Input
Manifold Pressure
(Inches W.C.)
Minimum Inlet
Pressure
(Inches W.C.)
Gas
Consumption*
(CFH)
CL3-(30, 40)-65
65,000 BTU/h
3.5
5.0
61.9
CL3-(30, 40)-75
75,000 BTU/h
3.5
5.0
74.4
CL3-(30, 40, 50)-80
80,000 BTU/h
3.5
5.0
76.2
CL3-(30, 40, 50)-85
85,000 BTU/h
3.5
5.0
81.0
Chart 3.9 allows for a 0.3” W.C. pressure drop in the supply pressure from the building main to the inlet of
the unit. Refer to the chart for the appropriate range of inlet pressures for each gas type. When sizing the
inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3” W.C. pressure
drop has been subtracted from the main pressure. If the 0.3” W.C. pressure drop is too high, refer to NFPA
54 or the Gas Engineer’s Handbook for other gas pipe capacities.
Model
Input
Manifold Pressure
(Inches W.C.)
Minimum Inlet
Pressure
(Inches W.C.)
Gallons per Hour*
CL3-(30, 40)-65
65,000 BTU/h
10.0
11.0
0.70
CL3-(30, 40)-75
75,000 BTU/h
10.0
11.0
0.81
CL3-(30, 40, 50)-80
80,000 BTU/h
10.0
11.0
0.87
CL3-(30, 40, 50)-85
85,000 BTU/h
10.0
11.0
0.92
Chart 3.8
•
Propane Gas Consumption
* Assumes an average heating value of 2,500 BTU/SCF and a Specific Gravity of 1.53.
