Stanley Brandon Dry Installation And Commissioning Instructions page 20

COMMISSIONING TABLE:
NAT.GAS
Inlet Gas Pres. 20 mbar
Manifold Pres. 6.4 mbar
(Dry Model)
Manifold Pres. 6.4 mbar
(DHW Model)
CO Range 8.2 - 9.4%
2
Ionisation 7µ Amps
Current min.
CO max 150ppm
Fig.30
Description of Landis and Gyr control box.
The following is a description of the start up
sequence of the control system. The corresponding
control box programme indicator symbol for each
step is shown in the left hand column.
Step Description
Turn on oven When the oven thermostat is
thermostat. turned on power is supplied to
the oven control box which start
immediately. The oven pressure
switch closes. The indicator cam
on the control box then rotates
to the start position.
Waiting Time During this interval the "No Air"
signal is checked by testing the
continuity between pins 3 and 6.
The control box also carries out
an internal check that it is not
receiving an ionisation flame
signal. At the end of this period
a signal is sent from pin 3 on the
control box.
L.P.G.
37 mbar
4.6mbar
4.1mbar
11.2 - 11.6%
7µ Amps
min.
100 ppm
Pressure Switch The control box checks that the
P
Pre-Purge
>>>>
Ignition
1.
Flame Signal
2.
l l l l
NOTE:
1. If the control box is interrupted during its
starting sequence it must continue through to
the end of this sequence before it can start a
new sequence. This may sometimes make the
start-up of the appliance seem very long.
2. If air on the operating burner is not proven at
start up or is lost during operation the pressure
switch will open and the control box will lock
out.
19
air pressure switch has switched
by testing that continuity no
longer exists between pins 3 and
6. If this is found to be
satisfactory the control box will
continue to the pre-purge stage.
The pre-purge period will last
approximately 30 seconds. The
control box checks continuity
between Pin 3 and Pin 11. It
also checks that Pins 7 and 9
are linked.
The transformer sparks and the
gas valve opens for 5 seconds.
A flame signal must be present
to hold the gas valve in the open
position.
Full load operation.
Operating Position.