Honeywell 2RM7800L1087 Installation Instructions Manual page 28

RM7800L1087; RM7840G1022,L1075; EC7840L1014 RELAY MODULES WITH VALVE PROVING
3/8
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
4
Item
V1 Upstream Valve Volume
V2 Downstream Valve Volume
D Pipe Size NPT (in.)
L Pipe Length (ft)
P
Valve Inlet Pressure (psig)
C
Burner Maximum Firing (cf/hr)
a
Divide inches w.c. by 27.7 to get psi.
b
Divide Btuh by 1000 to get cf/hr for natural gas or by 2550 to get cf/hr for LP gas.
66-1162—2
Table 15. Schedule 40 Pipe Internal Cross-Sectional Area.
Pipe Size NPT (Inches)
Table 16. VPS Worksheet.
Description
a
b
Cross-Sectional Area (Sq. In.) "A"
0.191
0.304
0.533
0.864
1.498
2.036
3.356
4.788
7.393
12.730
Information Lookup Table
12
13
14
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28
Results Formula Item
V1
V2
A
L
P
C