Honeywell Y8610U Product Data page 17

APPEARANCE
SMALL BLUE FLAME
CHECK FOR LACK OF GAS FROM:
• CLOGGED ORIFICE FILTER
• CLOGGED PILOT FILTER
• LOW GAS SUPPLY PRESSURE
• PILOT ADJUSTMENT AT MINIMUM
LAZY YELLOW FLAME
CHECK FOR LACK OF AIR FROM:
• DIRTY ORIFICE
• DIRTY LINT SCREEN, IF USED
• DIRTY PRIMARY AIR OPENING,
IF THERE IS ONE
• PILOT ADJUSTMENT AT MINIMUM
WAVING BLUE FLAME
CHECK FOR:
• EXCESSIVE DRAFT AT PILOT
LOCATION
• RECIRCULATING PRODUCTS
OF COMBUSTION
NOISY LIFTING BLOWING FLAME CHECK FOR:
• HIGH GAS PRESSURE
HARD SHARP FLAME
THIS FLAME IS CHARACTERISTIC
OF MANUFACTURED GAS
CHECK FOR:
• HIGH GAS PRESSURE
• ORIFICE TOO SMALL
Fig. 20. Examples of unsatisfactory pilot flames.
W136 TEST METER
BLACK (-)
1
RED (+)
1 ADJUST IGNITER-SENSOR UNTIL FLAME CURRENT EQUALS AT LEAST 1.0 µA (AND STEADY).
CAUSE
M558
GND
MV MV/PV PV (BURNER)
PILOT
BURNER
GROUND
Fig. 21. Adjusting flame current.
17
Y8610U INTERMITTENT PILOT RETROFIT KIT
Adjust Pilot Flame Current
The pilot flame current must measure at least 1uA and steady
or nuisance shutdowns can occur. Use a Honeywell W136 to
adjust the pilot flame current.
Disconnect the furnace power at the service entrance.
Disconnect the control module green ground wire.
Connect the microammeter negative lead to the control
module GND (BURNER) terminal and the positive lead
to the green ground wire (see Fig. 21).
Disconnect the red wire from the gas control TH or MV
terminal to disable the gas control.
Loosen the set screws holding the igniter-sensor on the
ground rod.
Restore power and set thermostat to call for heat.
Wait until the pilot lights and sparking stops. The main
burner can not light.
Adjust the igniter-sensor position and watch the
microammeter reading.
When you find the igniter-sensor position that gives the
maximum microammeter reading, tighten the setscrews
to lock the igniter-sensor in place. This reading must be
at least 1.0 uA and steady.
Turn off power, remove microammeter, and reconnect
red and green leads.
Perform Checkout procedures.
S8610U
VENT
TH-W
DAMPER
24V
(OPT)
PLUG
GND 24V SENSE SPARK
M3309
68-0133—2