Cumberland VariFlame VF-16-ONG, Owner'S Manual

Page: 18 / 64

Chapter 2: Specifications
Values
Parameter
Symbol Description
Unit Min
Typical
Max
Post-purge
time
TPOPG
Purge time that takes place imme-
diately following the shutting off of
the fuel supply
ms
4950 5500 6050
Recycle time
TRE
Period of time between the signal
to de-energize the fuel flow means
following the loss of flame and the
signal to begin a new start-up
procedure
ms
4500
-
9000
Start-up lock-
out time
TSTLCKO
Period of time between the signal
to energize the fuel flow means
and lock-out. For systems which
control two separate fuel flow
means, two different start-up lock-
out times are possible (first and
second start-up lock-out times).
ms
0
-
1000
Valve open
period / Trial-
for-ignition
period
TTRIGP
For multi-try systems, the period of
time between the signal to ener-
gize the fuel flow means, and the
signal to de-energize the fuel flow
means, if proof of the supervised
burner flame is not established. In
the USA, this period is referred to
as the “trial-for-ignition period”.
ms
3870 4300 4730
The period of time between ener-
gizing and de-energizing the fuel
flow means, if proof of the super-
vised flame is not established. For
systems incorporating interrupted
pilot ignition – also considered
main burner flame establishing
period.
Valve
sequence
period
TVLSQ
For multi-try systems, the sum of
all valve opening periods prior to
lock-out, if proof of the supervised
burner flame is not established
ms
11610 12900 14190
Inter-purge
time
TINPG
On a multitry system, the purge
time that takes place between the
end of a trial for ignition period and
reactivation of the ignition means if
proof of the supervised flame is not
established.
Inter-purge time is normally pro-
vided for burners where air for
combustion is mechanically intro-
duced for ventilation of the com-
bustion chamber and flue
ms
4950 5500 6050
18 PNEG-2091 VariFlame™ Heater