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60-2034—7
RA890F
Flame Safeguard
Primary Control
The RA890F Protectorelay™ Primary Control
is a nonprogramming, amplifying relay that pro-
vides solid state electronic flame safeguard pro-
tection for industrial and commercial gas, oil, or
combination gas-oil burners.
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Employs rectification principle of electronic flame
detection using a flame rod, rectifying photocell, or
C7012A,C Ultraviolet Flame Detector.
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Clipping pilot link jumper wire permits use with
standing pilots.
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Can directly replace RA890E and mount on same
Q270A Subbase.
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Solid state circuitry eliminates vacuum tube replace-
ment and increases resistance to vibration. Power
application not required during Off cycle; no tube to
warm up before starting.
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Push-to-reset safety switch in dust-resistant enclosure.
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Built-in protection against ignition crossover in flame
rod systems.
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Does not start if flame-simulating failure occurs in
flame detector circuit.
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Automatic safety shutdown if flame fails on start, or
if flame not re-established after flame failure.
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Flame signal current is directly measurable at test
jack.
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Line or 24 volt, automatic or manual controller can be
used. (Manual controller must open circuit on either
power or flame failure.)
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Captive mounting screws allow easy mounting and
removal. Thermoplastic mounting base.
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Optional alarm circuit indicates safety shutdown.
S.Y. • Rev. 11-94 • ©Honeywell Inc. 1994
60-2034-7
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Operation ....................................................... 7
Checkout ......................................................... 8
Service .......................................................... 10
Troubleshooting and Maintenance .............. 10