Submittal Sheet

60-2049—7 G.R. Rev. 02-03 Printed in China www.honeywell.com
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
Q624A SOLID STATE SPARK GENERATOR
Table 1. Wiring Connections.
Fig. 4. Q624A connections for RA890G, R4795, R4126,
R4127, R4140, BC7000 and 7800 SERIES flame safeguard
controls.
Fig. 5. Q624A connections for R4150 flame safeguard
control.
CHECKOUT
After the Q624A installation and wiring has been completed,
make the following checks to ensure that the system is
working properly.
Ignition Spark Response Test
The flame relay should not respond (pull in) to ignition spark.
To determine flame detector sensitivity to ignition spark,
perform the following steps:
1. Shut off the fuel supply to both pilot and main fuel
valves manually.
2. Start system by raising the controller set point or by
pressing the Start button.
3. Energize the Q624A Solid State Spark Generator so
ignition spark is produced between electrode and
ground.
4. Check to be sure that ignition has not occurred (there
should be no flame). Repeat steps 1 through 3 above
until there is no flame.
5. Check the flame relay on the flame safeguard control. If
the relay has not pulled in, the system is operating
properly. Continue checkout with the pilot turndown test.
6. If the flame relay pulls in, stop the system, replace the
Q624A, and repeat steps 2 through 5.
7. If the flame relay pulls in after replacing the Q624A, stop
the system, replace the flame safeguard control, and
repeat steps 2 through 5.
8. If the flame relay pulls in after replacing the flame
safeguard control, contact the local Honeywell branch
office.
Pilot Turndown Test
Refer to the flame safeguard control instructions for the exact
procedure to be used in performing the pilot turndown test.
Final Checkout
After other checks have been completed, restore the system
to normal operation and observe at least one complete cycle
of operation to be sure of satisfactory burner operation.
Flame
Safeguard
Control
Model
Q624A
Terminal
Flame Safeguard Control
Terminal
RA890G
and R4795
T1
T2
4
L2
R4126,
R4127,
R4140, and
BC7000
T1
T2
Appropriate ignition terminal as
specified on programmer instruction
sheet.
L2
R4150 T1
T2
L2
Appropriate ignition terminal as
specified on programmer instruction
sheet.
RM7800 T1
T2
10
L2
L2
T1
T2
IGNITION TERMINAL OF PRIMARY SAFETY
CONTROL; SEE APPROPRIATE INSTRUCTIO
N
SHEET FOR TERMINAL DESIGNATION.
PRIMARY
SAFETY
CONTROL
TERMINAL BOARD
INSIDE Q624A
M979
2
1
1
2
TERMINAL STRIP OR WIRING SUBBASE.
USE NEC CLASS 1 WIRING.
2
L2 T1
T2
IGNITION TERMINAL OF PRIMARY SAFETY
CONTROL; SEE APPROPRIATE INSTRUCTIO
N
SHEET FOR TERMINAL DESIGNATION.
PRIMARY
SAFETY
CONTROL
TERMINAL BOARD
INSIDE Q624A
M979
1
1
1
2
TERMINAL STRIP OR WIRING SUBBASE.
USE NEC CLASS 1 WIRING.
2