Honeywell R4795A- Manuals

Page 2 - SPECIFICATIONS • ORDERING INFORMATION; Specifications

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...

Page 4 - INSTALLATION; Installation; Vibration; CAUTION; Humidity; WIRING TO SUBBASE

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...

Page 5 - Wiring Hookups; The typical wiring hookups in Fig. 2 and 3 show the; the entire connected electrical load.

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...

Page 6 - Flame Detector Wiring

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. 3. Move burner mo...

Page 7 - Replace cover and securely tighten thumbscrew.

7 60-2285—7 R4795A INSTALLATION Fig. 6—Flame detector wiring. M8686 BLUE WHITE F G C7027, C7035, OR C7044ULTRAVIOLET 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...

Page 8 - CHECKOUT; Checkout; CHECKOUT SUMMARY; PRELIMINARY INSPECTION; IMPORTANT: Anytime you reset the safety switch, wait at

60-2285—7 8 R4795A CHECKOUT Checkout Fig. 10—Internal view showing amplifier andtest jack for flame current test. CAUTION Use extreme care while testing the R4795; linevoltage can be present on most terminals when thepower is On. CHECKOUT SUMMARY The following list summarizes the checkout tests re- ...

Page 9 - PILOT TURNDOWN TEST; IMPORTANT: If the R4795 is used to prove a pilot flame,; FLAME CURRENT CHECK

9 60-2285—7 R4795A CHECKOUT 2. The flame current is at least two microamperes for R7289A Rectification Amplifier (color-coded green), or atleast 1.5 microamperes for an R7290A Ultraviolet Amplifier(color-coded violet). IF A STEADY READING OF AT LEAST MINIMUM STRENGTH CANNOT BE OBTAINED, ONE OR MOREO...

Page 10 - IMPORTANT: Repeat ALL required checkout tests after all; Flame Failure; IMPORTANT: At the completion of all Checkout tests,

60-2285—7 10 R4795A CHECKOUT CAUTION 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 notlight within one second, close the shutoff cock and shut off...

Page 11 - OPERATION • TROUBLESHOOTING; Operation; SAFETY OPERATION; Troubleshooting; IMPORTANT: At the completion of any troubleshooting

11 60-2285—7 R4795A OPERATION • TROUBLESHOOTING Operation NORMAL OPERATION (REFER TO FIG. 2 AND 3.) Call for Heat (Limit SwitchClosed) Terminal 1 energized. Relay 3K pulls in to close contact 3K2 and energizeterminal 8 fan or burner motor. Airflow Proved Low voltage airflow switch between terminals ...

Page 12 - TROUBLESHOOTING; Clean contacts only when instructed to do so in a

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). TROUBLESHOOTIN...

Page 13 - TROUBLESHOOTING • SERVICE; H. Miscellaneous problems; What it is. Ignition interference is a false signal; Service; GENERAL

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 dro...