Honeywell R4795A Bedienungsanleitung PDF herunterladen

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

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - Primary Controls

1 60-2285—7R4795AFlame SafeguardPrimary ControlsThe R4795A Protectorelay™ Primary Controlprovides solid state electronic flame safeguardprotection for

Seite 2 - Ordering Information

60-2285—7 10R4795ACHECKOUTCAUTIONDo not manually push in the relays.4. Check that the pilot is lit and relay 2K is pulled in.5. Open the manual main b

Seite 3

11 60-2285—7R4795AOPERATION • TROUBLESHOOTINGOperationNORMAL OPERATION (REFER TO FIG. 2 AND 3.)Call for Heat (Limit SwitchClosed)Terminal 1 energized.

Seite 4 - Installation

60-2285—7 12R4795ATROUBLESHOOTINGF. Pilot lights and relay 2K pulls in but the main burnerdoes not light.G. Relay 2K remains in after flame is extingu

Seite 5

13 60-2285—7R4795ATROUBLESHOOTING • SERVICE(3) Remove any flame simulating condition suchas false light.(4) Note that any change made in the detector

Seite 6

60-2285—7 14R4795ASERVICEIMPORTANT:1. Do not clean contacts unless absolutely necessary.2. Use only Honeywell Contact Cleaner part no. 132569.Do not u

Seite 7 - Fig. 6—Flame detector wiring

15 60-2285—7

Seite 8 - Checkout

Home and Building Control Home and Building ControlHoneywell Inc. Honeywell Limited—Honeywell Limitée1985 Douglas Drive North 740 Ellesmere RoadGolden

Seite 9

60-2285—7 2R4795ASPECIFICATIONS • ORDERING INFORMATIONSpecificationsR4795A Flame Safeguard Primary Control recycles onceafter flame failure to try t

Seite 10

3 60-2285—7R4795ASPECIFICATIONSTERMINAL RATINGS:Terminal Load Rating3 Pilot Valve 125 VA pilot duty.Intermittent Ignitiona360 VA.4 Interrupted Ignitio

Seite 11 - Troubleshooting

60-2285—7 4R4795AINSTALLATIONInstallationVibrationDo not install the R4795A where it could be subject toexcessive vibration. Vibration shortens the li

Seite 12

5 60-2285—7R4795AINSTALLATIONIMPORTANT: Do not run high voltage ignition trans-former wires in the same conduit with the flamedetector wiring.5. For i

Seite 13

60-2285—7 6R4795AINSTALLATIONReplacing RA890E,F,G with R4795A1. Disconnect all wires from terminal 1, and splice withsolderless connector. (If RA890 h

Seite 14

7 60-2285—7R4795AINSTALLATIONFig. 6—Flame detector wiring.M8686BLUEWHITEFGC7027, C7035, OR C7044ULTRAVIOLET FLAME DETECTORBLUEYELLOWBLACKBLACKFGC7012

Seite 15 - 15 60-2285—7

60-2285—7 8R4795ACHECKOUTCheckoutFig. 10—Internal view showing amplifier andtest jack for flame current test.CAUTIONUse extreme care while testing the

Seite 16 - Printed in United States

9 60-2285—7R4795ACHECKOUT2. The flame current is at least two microamperes forR7289A Rectification Amplifier (color-coded green), or atleast 1.5 micro

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