Installation manual

FIGURE 27: Troubleshooting Flow Chart (continued)
Adjust system for proper
vacuum at the end vent.
See Section 7 for details.
Wrong end vent plate may
be installed. Make sure
plate and burner match.
Is the end vent vacuum
setting too high?
Ye s
No
Replace burner transformer.
Replace ignition module.
Is there 24 V at the burner
transformer secondary
(blue and yellow wires)?
Ye s
No
Troubleshoot Ends
Pre-purge. Wait 45 seconds.
Do the burners light?
Check LED on module and
refer to LED codes below.
Ye s
No
Check for proper vacuum
at end vent. See Section 7
for details.
Unplug burner, wait 10 seconds,
then plug it in again. Does the
ignition module begin ignition
sequence by sparking?
No
Ye s
Replace plug-in relay. See
Section 8.
Correct gas problem. See gas
piping section of
CORAYVAC
®
IOS manual
(P/N 127102NA)
Is there proper gas pressure
and flow to the burners?
Ye s
No
Verify wiring between
controller and burner.
Contact your
ROBERTS GORDON
®
Independent Distributor.
No
Ye s
Is there 24 Vac across the
control board 24 V output
(#1-3) for that zone?
No
Ye s
Is there continuity across
meter input #4 (pressure
switch input) on the control
board?
Do all the burners ignite
smoothly?
No
No
On the relay board, is the
appropriate zone relay (#1-
3) LED lit?
After 45 seconds pre-purge
period, do the burners light?
No
Ye s
Ye s
Verify pressure switch
wiring and operation.
Replace pressure switch
if necessary.
No
Is there power at the burner
recepticle?
No
Ye s
Is there 24 Vac across the
relay board's appropriate 24 V output connection (#1-3)?
Secure wiring between 24 V
output on the control board
and output connection on the
relay board.
Ye s
Contact your
ROBERTS GORDON
®
Independent Distributor.
Ye s
Are shield wires from RS-485
communication wiring and
VFD 0-10 V signal wiring
correctly twisted and/or
grounded?
No
Ye s
Are pump and/or burners
turning on and off erratically?
Ye s
Ye s
Ye s
Ye s
Ye s
Ignition Module Diagnostic Codes:
LED Problem Solution 4 second steady flash at start of cycle Normal Wait for valve to open Steady on Microprocessor failure Replace module
within module
Three flashes Ignition lockout Recycle unit: check for
Lockout of module spark and valve opening and after 3 tries replace:if none, replace module