Honeywell EnviraCOM R7284B Instructions D'installation 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
69-2467EFS—05
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. 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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