Honeywell R4795A- Manual
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Table of Contents:
- Page 2 – SPECIFICATIONS • ORDERING INFORMATION; Specifications
- Page 4 – INSTALLATION; Installation; Vibration; CAUTION; Humidity; WIRING TO SUBBASE
- Page 5 – Wiring Hookups; The typical wiring hookups in Fig. 2 and 3 show the; the entire connected electrical load.
- Page 6 – Flame Detector Wiring
- Page 7 – Replace cover and securely tighten thumbscrew.
- Page 8 – CHECKOUT; Checkout; CHECKOUT SUMMARY; PRELIMINARY INSPECTION; IMPORTANT: Anytime you reset the safety switch, wait at
- Page 9 – PILOT TURNDOWN TEST; IMPORTANT: If the R4795 is used to prove a pilot flame,; FLAME CURRENT CHECK
- Page 10 – IMPORTANT: Repeat ALL required checkout tests after all; Flame Failure; IMPORTANT: At the completion of all Checkout tests,
- Page 11 – OPERATION • TROUBLESHOOTING; Operation; SAFETY OPERATION; Troubleshooting; IMPORTANT: At the completion of any troubleshooting
- Page 12 – TROUBLESHOOTING; Clean contacts only when instructed to do so in a
- Page 13 – TROUBLESHOOTING • SERVICE; H. Miscellaneous problems; What it is. Ignition interference is a false signal; Service; GENERAL
1
60-2285—7
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, plug-in prepurge timers pro-
vides 7, 10, 30, 60, or 90 second prepurge time.
■
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, color-coded, solid state,
plug-in flame signal amplifiers allows use with rec-
tification or ultraviolet type flame detectors.
■
Safe-start feature prevents start when flame or flame
simulating condition is present.
■
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.
■
Push-to-reset safety switch is dust-resistant enclosed.
■
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.
■
Easy-to-replace plug-in components result in faster
service and reduced inventory.
■
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 -40
°
F (-40
°
C) temperature
rating.
S.Y. • Rev. 12-94 • ©Honeywell Inc. 1994
60-2285-7
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Checkout ......................................................... 8
Operation ..................................................... 11
Troubleshooting ........................................... 11
Service .......................................................... 13
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Summary
60-2285—7 2 R4795A SPECIFICATIONS • ORDERING INFORMATION Specifications R4795A Flame Safeguard Primary Control recycles once after flame failure to try to re-establish pilot before lockout.Use with R7289A Amplifier and rectifying flame rod, recti-fying photocell, or C7012A,C Purple Peeper Ultraviole...
60-2285—7 4 R4795A INSTALLATION Installation Vibration Do not install the R4795A where it could be subject to excessive vibration. Vibration shortens the life of the elec-tronic and mechanical components. Weather The R4795A is not designed to be weathertight. If it is installed outdoors, use a suita...
5 60-2285—7 R4795A INSTALLATION IMPORTANT: Do not run high voltage ignition trans- former wires in the same conduit with the flamedetector wiring. 5. For ignition installations in a contaminating environ- ment, use Honeywell Specification no. R1239001 High Ten-sion Ignition Cable or equivalent. This...
