Test Period T; Opening Time T - Honeywell BCU 460 Technical Information

Valve proving system

6 .1 .3 Test period t

P
Depending on the burner capacity, the tightness of the
gas solenoid valves must be checked in accordance
with the relevant application standard, e.g. EN 676,
EN 746, NFPA 85 and NFPA 86.
p
u
ϑ
1
3
µC
The test period t is calculated from:
2
P
– Opening times t for V1 and V2,
BCU 560..C1 L
– Measurement times t
t
P
PZL

6 .1 .4 Opening time t

L
Standard EN 1643:2000 allows a maximum opening
time of 3 s for the tightness test if the main gas valves
are actuated directly. If gas can flow into the combus-
tion chamber when a valve is opened, the gas volume
must not exceed 0.083% of the maximum flow rate.
BCU 460, BCU 465 · Edition 11.19
V1 V2
PZ PZ
p
V
z
p1
61 60
38
p p /2 /2
u u
P
>750°
TC
for V1 and V2.
36 37
M
[s] = 2 x t + 2 x t
L M
PDZ
p
d
44