Instruction/ maintenance manual of the product R4795A Honeywell
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1 60-2285—7 R4795A Flame Safeguard Primary Contr ols The R4795A Protectorelay™ Primary Control provides solid state electronic flame safeguard protection for commercial and industrial gas or oil burn ers. It provides a prepurge period before each start, and intermittent pilot.
60-2285—7 2 R4795A SPECIFICATIONS • ORDERING INFORMATION Specif ications R4795A Flame Safeguard Primary Control recycles once after flame failure to try to re-establish pilot before lockout.
3 60-2285—7 R4795A SPECIFICATIONS TERMINAL RATINGS: Terminal Load Rating 3 Pilot Valve 125 VA pilot duty. Intermittent Ignition a 360 VA. 4 Interrupted Ignition 360 VA. 5 Main Fuel Valve(s) 125 VA pilot duty, or 25 VA pilot duty plus one or more motorized valves with total rating up to 400 VA opening, 200 VA holding.
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.
5 60-2285—7 R4795A INSTALLATION IMPORTANT: Do not run high voltage ignition trans- former wires in the same conduit with the flame detector wiring. 5. For ignition installations in a contaminating environ- ment, use Honeywell Specification no. R1239001 High Ten- sion Ignition Cable or equivalent.
60-2285—7 6 R4795A INSTALLATION Replacing RA890E,F,G with R4795A 1. Disconnect all wires from terminal 1, and splice with solderless connector. (If RA890 has no terminal 1 wiring, disregard this step.) 2. Remove line voltage controller wire from terminal 6 and connect to terminal 1.
7 60-2285—7 R4795A INSTALLATION Fig. 6—Flame detector wiring. M8686 BLUE WHITE F G C7027, C7035, OR C7044 ULTRAVIOLET FLAME DETECTOR BLUE YELLOW BLACK BLACK F G C7012 ULTRAVIOLET DETECTOR 1 G F X X X X X X FLAME ROD G F X X PHOTOCELL 1 C7027, C7035, AND C7044 FLAME DETECTOR LEADS ARE COLOR CODED BLUE AND WHITE.
60-2285—7 8 R4795A CHECKOUT Check out Fig. 10—Internal view showing amplifier and test jack for flame current test. CA UTION Use extreme care while testing the R4795; line voltage can be present on most terminals when the power is On. CHECKOUT SUMMARY The following list summarizes the checkout tests re- quired for each type of installation.
9 60-2285—7 R4795A CHECKOUT 2. The flame current is at least two microamperes for R7289A Rectification Amplifier (color-coded green), or at least 1.5 microamperes for an R7290A Ultraviolet Amplifier (color-coded violet).
60-2285—7 10 R4795A CHECKOUT CA UTION Do not manually push in the relays. 4. Check that the pilot is lit and relay 2K is pulled in. 5. Open the manual main burner shutoff cock. Main flame should light within one second. If the burner does not light within one second, close the shutoff cock and shut off power to the relay.
11 60-2285—7 R4795A OPERATION • TROUBLESHOOTING Operation NORMAL OPERATION (REFER TO FIG. 2 AND 3.) Call for Heat (Limit Switch Closed) Terminal 1 energized. Relay 3K pulls in to close contact 3K2 and energize terminal 8 fan or burner motor. Airflow Proved Low voltage airflow switch between terminals 6 and 7 closes to energize the purge timer.
60-2285—7 12 R4795A TROUBLESHOOTING F. Pilot lights and relay 2K pulls in but the main burner does not light. G. Relay 2K remains in after flame is extinguished. H. Miscellaneous problems: 1. Repeated lockouts or control failures. 2. Ignition interference (flame rod installations only).
13 60-2285—7 R4795A TROUBLESHOOTING • SERVICE (3) Remove any flame simulating condition such as false light. (4) Note that any change made in the detector or its sighting requires a pilot turndown test. 3. If using an R7290 Ultraviolet Amplifier, replace the amplifier and recheck the flame relay dropout time.
60-2285—7 14 R4795A SERVICE IMPORTANT: 1. Do not clean contacts unless absolutely necessary. 2. Use only Honeywell Contact Cleaner part no. 132569. Do not use any other type of contact cleaner. 3. Use extreme care to avoid bending the contacts or changing the specifications or configuration in any way.
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Home and Building Control Home and Building Control Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 Printed in United States www.
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If you already are a holder of Honeywell R4795A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell R4795A.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell R4795A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell R4795A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
