Honeywell S8910U3000 Instrucciones Para La Instalación página 14

S8910U3000
Step 2: Verify control system ground.
The ignition module must share a common ground with the
main burner. The burner serves as the common grounding
area to assure reliable flame detection. If there is not good
metal-to-metal contact between the burner and ground, run a
lead from the burner to ground.
Step 3: Review normal operating sequence and module
specifications. See Operation and Application sections.
Step 4: Reset the ignition module.
a. Turn the thermostat or controller to the lowest setting.
b. Turn on the system power.
c. Wait one minute.
As you do Steps 5 and 6, watch for points where operation
deviates from normal. Refer to Troubleshooting section to
correct the problem.
Step 5: Check the safety lockout operation.
a. Turn off the gas supply.
b. Set the thermostat or controller above the room
temperature to call for heat.
c. Watch for igniter warmup following prepurge. Igniter
starts to glow several seconds after it is powered.
d. Time the length of time gas control is energized; measure
the time by connecting a voltmeter across the gas valve
terminals.
e. When configuring control for three ignition trials, watch for
the start of the 96-second between trial purge, followed
by a configured igniter warmup period and a second try
for ignition. After a third purge, warmup, and trial for
ignition sequence, the S8910U should lock out. The LED
displays a brief red flash. Refer to Table 6 for a complete
list of LED codes.
f. Open the manual gas control knob and make sure no gas
is flowing to the burner.
g. Set the thermostat below the room temperature and wait
one minute before continuing.
Step 6: Check normal operation.
a. Set the thermostat or the controller above the room
temperature to call for heat.
b. Observe the lightoff sequence and make sure the main
burner lights smoothly without flashback.
c. Make sure the burner operates smoothly without floating,
lifting, or flame rollout to the furnace vestibule or heat
buildup in the vestibule.
d. Test for a gas leak downstream of the gas control if the
piping has been disturbed.
GAS LEAK TEST: Paint the gas control gasket edges and all
pipe connections downstream of the gas control with a rich
soap and water solution. Bubbles indicate a gas leak. Tighten
the joints and screws or replace the component to stop a gas
leak. Recheck with soap and water solution.
e. Check the burner flame condition. The igniter-sensor or
sensor must be constantly immersed in flame. Check the
burner flame condition as shown in Fig. 5. Do not relocate
the hot surface igniter or flame rod.
34-00008EFS—01
f. Turn the thermostat or controller below the room
temperature. Make sure the main burner and the pilot
flames go out.
WARNING
FIRE OR EXPLOSION HAZARD.
CAN CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH.
Improper location of the 120 Vac hot surface igniter or
any flame sensing rod can result in appliance
malfunction.
1. Never attempt to relocate the 120 Vac hot surface
igniter or the flame sensing rod from the original
position established by the appliance manufacturer.
2. Be sure the 120 Vac hot surface igniter or the flame
sensing rod is replaced in exactly the original
position after removal for inspection, service or
replacement.
CHECK BURNER FLAME CONDITION
NOISY
LIFTING
FLAME
BURNER
WAVING
FLAME
SMALL
BLUE
FLAME
LAZY
YELLOW
FLAME
1/4 TO 1/2 IN. (6 TO 13 MM)
Fig. 5. Check burner flame condition.
OPERATION
The S8910U is a direct ignition control used with 120 Vac timed
warmup hot surface igniter. The control provides operating
control and shuts off all gas flow on ignition failure or loss of
main burner flame in central heat furnaces and other heating
appliances.
Module operation is in three phases—prepurge/igniter
warmup, trial for ignition and burner operation. The S8910U
provides one or three trials for ignition, depending on the DIP
switch configuration. Fig. 6 shows the normal operating
sequence.
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CHECK FOR:
• HIGH GAS PRESSURE
• EXCESS PRIMARY AIR
OR DRAFT
CHECK FOR:
• POOR DRAFT
• EXCESS DRAFT
• HIGH VELOCITY OR
SECONDARY AIR
INSTALL SHIELD IF NECESSARY
CHECK FOR:
• CLOGGED PORTS OR
ORIFICE FILTER
• WRONG SIZE ORIFICE
CHECK FOR LACK OF
AIR FROM:
• DIRTY PRIMARY
AIR OPENING
• LARGE PORTS
OR ORIFICES
GOOD
RECTIFYING
FLAME
3/4 TO 1 IN. (19 TO 25 MM)
M8446B