15
Description of Operation (con’t)
Lockout
The control will lockout if any self-checks fail during normal operation. Also, the control will lockout if it failed to ignite
gas after the selected number of ignition attempts or ignition recycles. In lockout the valve and ignition means are
turned off. The control must be manually reset by cycling bake or broil off and back on.
Flame with Gas Valve Off
If there is proof of flame for ten seconds with the gas valve off, the control will go to lockout. If there is flame for less
than ten seconds, the control will reset.
LOGIC FLOW DIAGRAM
14
DSI SPARK MODULE SPECIFICATIONS
Power Requirements
Input Voltage range (L1-N)
102 to 132 VAC, 60/50 Hz 135 mA current typical
Control Outputs
Bake or Broil Burner
Coil Pull-in pulse
54VDC + 10% @ 250mA
Coil Hold-in
36 mA minimum
Life Requirements
2000,000 cycles
Bake and Broil Spark:
16.5 KV @ 50 PFD load @ nominal conditions
Design Life
2,000,000 sparks
Spark Rate
3 sparks then 1 second delay (repeated Cadence)
Control Inputs
Flame Sense Type:
Flame Rectification
Minimum Flame Sense:
1
m
A. min.
Flame Sense Model:
A 25 M
W
resistor in series with a 1N4004 diode
Control Timing
All timings are 60 Hz; timings will be 20% longer at 50 Hz. Times are +/- 0.2 seconds except for flame failure response
time.
Trial for ignition period
10.0 sec
Flame failure response time:
30.0 sec max.
Lock out time:
15.0 sec
Flame establishing period:
0.5 sec
Conditional prepurge time:
30.0 sec
Recycle time:
30.0 sec
Interpurge time:
30.0 sec
Ignition attempts:
3
Ignition recycles:
1
Description of Operation
Overview
The GDS/DSI control interfaces with a thermostat, a valve, and spark electrodes to provide a complete direct spark
ignition system for gas ranges. The DSI is a 0 + 2 DSI system: 2 oven burner spark outputs with flame sense and valve
enable safety supervision. Contact closure inputs from the thermostat initiates micro controlled logic, which supervises
gas distribution to an oven burner and the ignition/flame sense safety circuits.
Oven Burner Ignition
Closure of the thermostat output contacts (BR and/or BA) applies L1 to the Broil (J1-7) and/or Bake (J1-6) inputs. The
Bake and/or Broil input is detected by the micro, which operates the gas valve and spark ignition sequence. The Logic
Flow Diagram and Timing Diagram illustrates the typical valve/ignition supervision sequence provided by the micro as
follows:
Power up initializes the micro ports and performs an internal self-test and a flame safety check. Failure of this
test sequence aborts operation in the lockout mode, which safety inhibits gas flow and sparking to prevent
ignition of any residual gas.
Verification of the safety checks initiates the Valve Trial Timer, which energizes the bake or broil solenoid. The
spark output rate is coordinated to the flame sense sequence, confirmation of flame sense typically occurs after
2 sparks. If flame is detected, the spark is inhibited, and the valve will be enabled/opened as long as flame
sense is normal and a call for heat is detected. If flame is not detected, the spark rate will continue for the full
duration of Valve Trial Time. Combustion failure during the ignition trial period or after the flame has been
established, will de-energize the solenoid for a 30-second interpurge time before initiating another trial for
ignition. If the control fails to establish proof of flame after a specified number of ignition attempts, the
external lockout is executed.
Содержание 30" W. Models
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