Honeywell R7284B Installation Instructions Manual page 10

R7284B,P,U,G ELECTRONIC OIL PRIMARY, ENVIRACOM™ ENABLED
Condition: Burner does not start with a call for heat
Procedure
Review error history if control in
lockout
Check that limit switches are
closed
Check TT status
Check for line voltage power at
R7284
Check status of cad cell
Condition: Burner does not stop when call for heat ends
Procedure
Check TT status
Check limit status
Check if other EnviraCOM
devices are commanding the
R7284 to run
EnviraCOM™
Display Alarm
Alarm Number
No Ignition 10
Check Igniter
No Ignition 5
Check Cad
Cell
No Ignition 20
Low Voltage 59
XX% low
Internal Error 18, 58
69-2467EFS—09
Table 6. Troubleshooting Information.
Control Status
--
Display models: display shows status
of limit switch.
Display models: display shows status
of TT.
--
Display models: display shows cad cell
resistance.
LED models: LED is on if cad cell is too
low to start.
Control Status
Display models: display shows status
of TT.
Display models: display shows status
of limit.
Display models: display shows "TT
Remote" if an EnviraCOM device is
commanding it to run.
Table 7. Display Alarm Information.
• The burner was not lit and spark was not detected. Check the electrodes, spring contacts (or high
voltage wires), and ignition transformer for proper operation.
• If spark ignition is functioning acceptably, proceed to "No Ignition" corrective action.
• The cad cell detected some amount of light during the ignition trial, but not enough to enter run
mode. Check the cad cell positioning and clean the eye.
• Set the display to show the cad cell resistance.
• Shield the cad cell from light.
• If the display shows is less than 20,000 ohms, unplug the cad cell.
— If the display does not read 999999 ohms, replace control
— If it does read 999999 ohms, replace cad cell.
• Expose the cad cell to ambient light (generally enough light to read by is adequate)
• If the display shows more than 2000 ohms, short the cad cell terminals.
— If the display shows more than 5 ohms, replace control
— If less than 5 ohms, replace cad cell.
• If the burner still does not light, proceed to "No Ignition" corrective action.
• Check that the manual shut off valve is open.
• Check that the burner motor is spinning and the pump is generating adequate pressure.
• Check the condition of the nozzle and replace if necessary.
• If a valve is present, check for proper operation.
• Check burner adjustments (refer to burner manufacturers instructions)
• Supply voltage is low to the control.
• Measure the voltage across screw terminals "2" and "3"
— If it's greater than 22VAC and the error does not clear, replace control.
— If it's less than 22VAC, review appliance wiring.
• An error has been detected inside the control. Replace control if the error persists.
Corrective Action
Refer to Error Codes table of this section
Replace limit switch or clean contacts.
• Most hydronic systems require TT to be jumpered. Display models
can be configured to behave as though the TT terminals are
jumpered. LED models require a jumper be added.
• Warm air systems will short TT terminals during a call for heat.
Check that TT is really shorted during the call for heat.
Check breaker and investigate appliance wiring
• Replace cad cell
• If operation does not resume, remove leadwires from R7284.
• If operation does not resume, replace control.
Corrective Action
• Check if a TT jumper is installed. When the R7284 and
L7224/L7248 electronic Aquastat are connected via the
EnviraCOM bus, neither a physical jumper across the TT terminals
or a configured TT jumper should be present on the oil primary.
• Check if the R7284 is configured to ignore the TT terminals.
• Verify thermostat contacts have opened. There should be 24VAC
across TT terminals when there is not call for heat.
Measure voltage on Limit terminal. There should be no voltage
between Limit and Neutral when the contacts are open. Replace limit
switch if necessary.
Unplug all EnviraCOM devices from R7284. It should turn off within
5 minutes.
Corrective Action
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