R4795A
Flame Safeguard
Primary Controls
The R4795A Protectorelay™ Primary Control provides solid state electronic flame safeguard protection for commercial and industrial gas or oil burners. It provides a prepurge period before each start, and intermittent pilot.
■120V models meet the requirements of Underwrit- ers Laboratories Inc. Standard 795 for mechanical draft and atmospheric burner inputs from 400,000 to 2,500,000 Btu.
■Meets Underwriters Laboratories Inc. requirements for oil burner group 8 when 30, 60, or 90 second pre- purge timer is used.
■Selection of solid state,
■Includes terminals for connection of air flow switch to prove airflow before prepurge period starts, dur- ing purge, and during the entire Run period.
■Choice of interchangeable,
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■Recycles through prepurge if the flame goes out while burner is running. If pilot flame is not re- established, safety switch trips and locks out system.
■A tripped safety switch must be manually reset to restore operation.
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■Optional spdt alarm contacts operate external alarm on safety switch lockout.
■Ignition interference circuit (rectification amplifier only) protects electronic network from high voltage ignition crossover and provides visual indication when interference occurs.
■Solid state circuitry eliminates vacuum tube replace- ment and increases resistance to vibration. Applica- tion of power not required during Off cycle; no tube warmup before starting.
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■Flame current jack, located on the amplifier, provides means of plugging in a microammeter to measure the flame signal with system operating.
■Easy mounting and removal through use of captive mounting screws, which also serve as electrical connections.
■Durable thermoplastic mounting base.
■Models available with
CONTENTS |
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Specifications | 2 |
Ordering Information | 2 |
Installation | 4 |
Checkout | 8 |
Operation | 11 |
Troubleshooting | 11 |
Service | 13 |
S.Y. • Rev. | 1 |
