Carlin G3B - Manual (Page 13)

Model G3B Gas burner — Instruction manual
Carlin part number MNG3B Gas Rev. 03/17/09
13
4. Check system • start-up burner/appliance
(continued)
Installer/servicer
Should overheating or an emergency occur, immediately:
• Shut off main manual gas valve.
• Shut off power to burner.
NOTICE: Under some circumstances power should remain
on for water pumps or circulating blowers. Determine proper
response before attempting start-up.
If burner fails ignition on several attempts, close gas valve
and use burner blower to purge appliance before restart.
Start-up & operation
Do not start the burner if the combustion chamber contains
residual gas. Allow gas to disperse. Failure to comply could
result in severe personal injury, death or substantial property
damage.
Power ON Open all manual gas line valves. Turn burner combination gas
valve knob to “ON.” Close the line switch. (If burner does not
follow sequence below, see troubleshooting suggestions on
pages 19 and 20.)
Stand-by (No call for heat) Control waits for heat call.
Call for heat Set operating control and all limit controls to call for heat.
The thermostat circuit must be closed and power coming to
control panel L1 and L2 terminals
Burner on The motor starts. The hot surface ignitor starts. The motor
centrifugal switch makes.
Pre-purge The primary control allows 34 seconds for pre-purge and
ignitor warm-up.
Gas valve on After the pre-purge/ignitor warm-up period, the primary
control activates the gas valve (if motor centrifugal switch
is closed). The green “Gas valve on” light turns on.
TFI The primary control turns off the ignitor within 2 to 6 seconds
after gas valve activation. When the control deactivates the
ignitor, it begins checking for fl ame signal. If fl ame is not
detected within 6 seconds after gas valve activation, the
primary control will lockout with continuous purge (see
following).
Run period The burner continues fi ring during call for heat if the fl ame
rod (hot surface ignitor) senses fl ame. The green “Gas valve
on” light remains on during normal running, indicating gas
valve is energized.
Shutdown When the call for heat ends, the primary control immediately
deactivates the gas valve and blower. The burner returns to
stand-by.
Flame failure If the primary control loses fl ame signal during a run period,
it deactivates the gas valve within 2 seconds. The control
restarts the heating cycle, beginning with a 34-second
pre-purge/ignitor warm-up period, then a 6-second trial for
ignition. If ignition/fl ame sensing is successful, the burner
returns to normal operation. If the attempt is not successful,
the primary control will lockout.
Lockout If the primary control does not sense fl ame within the TFI
time limit after gas valve activation (6 seconds), lockout
occurs. The control deactivates the gas valve. The blower
motor continues to run, providing a post-purge of the burner
and appliance.
Reset To reset after a lockout, turn off power to burner or interrupt
the thermostat circuit for at least 45 seconds. Then restore
power (or thermostat circuit). Burner should restart.
Ignition and fl ame sensing
Ignition The G3B burner uses a silicon carbide hot surface ignitor
for ignition. The Honeywell S89C primary control feeds 120
VAC power to the ignitor and allows time for the ignitor to
warm up to ignition temperature during the burner pre-purge
period.
Sensing The S89C primary control uses fl ame rectifi cation to detect
fl ame, with the hot surface ignitor acting as the “fl ame
rod.”
Before starting burner, verify:
❏
Burner/appliance installed per appliance instruction manual?
❏
Burner orifi ce size and air throttle verifi ed against Figure 4, page 8?
❏
Burner/appliance installed per all applicable codes?
❏
Installation site has adequate ventilation openings and vent
system?
❏
Gas supply line in good condition and sized correctly?
❏
All gas line joints sealed with pipe dope listed for use with liquefi ed
petroleum gases?
❏
Gas supply pressure to combination gas valve checked?
❏
Regulator installed if pressure can exceed 14 inches w.c.?
❏
Air purged from gas line?
❏
Gas piping checked for leaks?
❏
Wiring installed per burner and appliance instruction manuals?