Honeywell 7800 Series Installation Instructions Manual page 24
Valve proving primary relay modules
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RM7898A 7800 SERIES VALVE PROVING PRIMARY RELAY MODULES
NOTE:
10 seconds is the minimum test time allowed. If your
calculations are less than 10 seconds, enter 10
seconds.
For Example:
Item
Description
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.
Calculation of Valve Train Volume:
X = V1 + V2 + (A x L ÷ 144)
X = 0.0218 + 0.0267 + (3.356 x 1.75 ÷ 144) = 0.0893.
Calculation of Valve Proving Test Time:
Pipe Size
NPT (inches)
V4295
3/8
0.0002
1/2
0.0002
3/4
0.0008
1
0.0009
1-1/4
0.0045
1-1/2
0.0045
2
0.0089
2-1/2
0.0441
3
0.0441
4
—
Pipe Size
NPT (inches)
V4295
3/8
0.0011
1/2
0.0011
3/4
0.0026
1
0.0036
1-1/4
0.0148
1-1/2
0.0148
2
0.0267
2-1/2
0.0554
3
0.0554
4
—
32-00209-03
Table 11. VPS Worksheet Example.
Information
V5055
V4295
2 in. NPT
1.75 ft
a
2
b
2.5 mbtu
Table 12. V1 Upstream Volumes for Honeywell Valves.
V4297A1013 V4297A1005
—
—
—
—
0.0093
0.0090
0.0093
0.0090
0.0093
0.0090
0.0093
—
0.0093
—
—
—
—
—
—
—
Table 13. V2 Downstream Volumes for Honeywell Valves.
V4297A1013 V4297A1005
—
—
—
—
0.0282
0.0232
0.0282
0.0232
0.0282
0.0232
0.0282
—
0.0282
—
—
—
—
—
—
—
24
We have a 2.5 MBTU burner with 2 psi valve train inlet
pressure. The upstream valve is a proof-of-closure V5044
with a solenoid V4295 valve downstream. We have a 2 in.
NPT pipe, 1-3/4 ft long, between the valves.
Lookup Table
12
13
14
—
—
—
Test Time = 187,000 x (P x X ÷ C)
Test Time = 187,000 x (2 x 0.0893 ÷ 2500) = 13.4
seconds.
Round up to 14 seconds; enter 14 seconds into the VPS
Setup.
V48
V5055
—
—
—
—
0.0010
0.0046
0.0010
0.0046
0.0035
0.0046
0.0035
0.0218
0.0048
0.0218
0.0048
0.0227
0.0048
0.0227
—
0.0779
V48
V5055
—
—
—
—
0.0048
0.0067
0.0048
0.0067
0.0110
0.0067
0.0110
0.0238
0.0184
0.0238
0.0184
0.0245
0.0184
0.0245
—
0.0801
Results
Formula Item
0.0218
V1
0.0267
V2
3.356
A
1.75
L
2
P
2500
C
V5097A1004 V5097A1012
—
—
—
—
0.0066
—
0.0066
—
0.0066
—
0.0066
—
0.0066
0.0285
—
0.0285
—
0.0285
—
—
V5097A1004 V5097A1012
—
—
—
—
0.0093
—
0.0093
—
0.0093
—
0.0093
—
0.0093
0.0303
—
0.0303
—
0.0303
—
—
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