Pinnacle Speakers GBU070 - Manual (Page 19)

STEP 3#
CONFIRM DRAFT FAN OPERATION
Be sure the main power switch is in the “Draft Fan” position. This will cause the draft fan to
operate at full power (110v). The draft fan will operate at 70 – 75v when pilot draft switch
is set at high. It will receive 60 – 65v in the medium position and zero volts in the off
position when furnace is not feeding fuel. You should be able to hear the draft fan come to
full speed. You can check movement of air by placing you hand over the fire pot. If
movement of air is not obvious, make sure that the shutter is open.
STEP #4
INSPECT FUEL METERING CUP FOR BLOCKAGE
To inspect the metering cup, first you will need to empty the hopper. Reach down through
the hopper and rock the cup back and forth. The cup should mover ¼ of an inch. If it does
not move, something is jamming it. Sometimes the obstruction can be removed by rotating
the blade on the cup motor counter clockwise. If this doesn’t work you will have to remove
the cup motor and cup to remove the blockage.
STEP #5
CONFIRM CUP AND AUGER MOTOR OPERATION
Place a jumper wire between the leads to the safety disc located on the exhaust flange. Set
the main power switch to “feed system”. Both the cup and auger motor should start now. If
the motors run but the fuel metering cup and/or auger do not turn, check the cast iron
couplers to make certain that the set screw is tight or that a coupler has not snapped off.
NOTE: Anytime you are checking the motors, you should verify the speed at which motors
are turning. This can be accomplished by timing the revolution of the coupler. Using the
setscrew as a reference the bottom motor (Auger) will make one revolution in 10 seconds.
The top motor (cup) will make approximately one revolution every 45 seconds. Remove
jumper wire and plug wire leads back to safety disc.
STEP #6
RELIGHT THE FURNACE
Use normal start up procedure to start the furnace.
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