1
A Honeywell Company
certified Qualitysystem
ISO 9001 / EN 29001
Reg. Nr. 10529
Oil Burner Safety Control
For 1- or 2-stage oil burners up to 30 kg/h
throughput and intermittent operations
with or without oil preheating
Flame detection:
- Photoresistor MZ 770 S
- Infrared-flicker detector IRD 1010
- UV flame sensor sensor UVD 970
INTRODUCTION
The DKO 974/976 oil burner safety control boxes are suitable
for oil burners with or without preheater with throughputs up
to 30 kg/h. They will be approved and certified according to
the applicable European standards and regulations.
The microprocessor- based programming sequence ensu-
res extremely stable timings independent of voltage varia-
tions, ambient temperature and/or switch-on cycles. The
built-in information system not only provides a continuous
monitoring of the actual state of the box (very helpful es-
pecially for monitoring the start-up phase) but also informs
about the cause of a possible lock out. The lock out cause
is stored in such a way that it can be retrieved even after a
power failure.
The control box is designed for maximum safety in case of
fluctuations in the voltage supply. If the mains voltage drops
below the permitted level, operation is interrupted and the
control box automatically prevents the start sequence from
being repeated. In this way, the safety of the system is not
put at risk by a drop in the mains voltage. This low-voltage
protection works not only during start-up but also perma-
nently during operation.
TYPES AVAILABLE
DKO 974 1-stage operation with release thermostat
DKO 976 2-stage operation with release thermostat
DKO 974N 1-stage operation without release thermostat
DKO 976N 2-stage operation without release thermostat
CONSTRUCTIONAL FEATURES
The control box circuitry is protected by a flame resistant,
transparent plug-in type plastic housing. A central fixing
screw locks the control box to the wiring base. The plug-in
control box incorporates the microprocessor based timer,
flame check and reset circuits. Manual reset from lock out
and set to lock out is provided by a push button with an
integrated lock out signal lamp. The wiring base S98 is
equipped with spare- and extraterminals and allows together
with a variety of cable entry points utmost flexibility of
electrical wiring.
The DKO 974 is compatible with the TF 834, TF 834.2. The
DKO 976 is in addition compatible with the TF 804, TF 804.2,
TF 836, TF 836.2.
Using the DKO 976 as a replacement for the TF
804 or TF 804.2, the flame sensor FZ 711 S must
be replaced by its compatible type MZ 770 S.
DKO 974/976
DKO 974 N/976 N
TECHNICAL DATA
Operating voltage 220 / 240 V (-15... +10%)
50 Hz ( ±5%)
Fuse rating 10 A fast, 6 A slow
Power consumption ca. 15 VA
Max. load per output
- term. 3 ignition trafo 1.0 A, cos ϕ 0.2
- term. 4 motor 2.0 A, cos ϕ 0.4
- term. 5 + B solenoid valves 0.5 A, cos ϕ 0.4
- term. 6 oil preheater 2.0 A, cos ϕ 1.0
- term. 7 alarm indicator 0.5 A, cos ϕ 0.4
total load 4.0 A, cos ϕ 0.4
max. 6 A during 0.5 sec
Reset time from lock out none
Flame detectors < 3 m length of cable
MZ 770 S side-on and
end-on viewing
Light sensitivity better 6 Lux
IRD 1010 side-on or end-on viewing
UVD 970 end-on viewing
Weight incl. Wiring base 190 g
Mounting position any
Protection class IP 40
Approved ambient parameter
for control and flame detector max. 95% bei 30°C
- for operation 0°C... +60°C
- for storage -20°C... +80°C
Build-up of ice, penetration of
water and condensing water are inadmissible
Approvals according
to European standards EN 230, aswell as all other
relevant Directives and
standards
Model waiting time max. warm-up Pre-purge and Stray light safety Post-ignition delay time to V2
start time oil preheater pre-ignition time monitoring time time after V1 DKO 976 only
ta tv1 tf ts tn tv2
05 0 400 15 5 5 7 20
Timings (sec.)
0650.11-01-e/01/99
