Honeywell EnviraCOM R7284B 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
Display Alarm
No Ignition, Check Igniter
No Ignition, Check Cad
Cell
69-2467—01
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
EnviraCOM™
Alarm
Number
10 • 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.
5 • 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.
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.
• 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
10