Yoder Smokers YS 640, Operation Manual

21

10. Turn the power switch “on.” This starts the combustion air fan and illuminates the power light. Press 

the “start” button on the control panel to activate the auger feed system. (The default temperature set 

point is 350° F). If a higher or lower temperature setting is desired, use the increase/decrease buttons 

to set the temperature. This can be adjusted at any time after the start cycle is activated. (For cool/cold 

season or high temperature cooking see the Selectable Heat Up Modes [Page 11]).

Once the start cycle is activated, three lines will appear on the display panel from lower left to upper right 

indicating “heat up” mode. Once the grate temperature reaches 

110° F, the actual grate temperature is displayed, alternating with the mode lines. 

If the grate temperature range is exceeded during the “heat up” mode, dashing lines will appear from 

upper left to lower right indicating “cool down” mode. Once the target temperature range is attained, the 

lines will 

fl

 ash horizontal indicating “maintenance mode”. The controller will display grate temperatures 

when the set point is between 150 and 495° F When the set point is between 500 and 600° F, the display 

will show the set point and not the actual grate temperature.

11. Flames should be visible on the burn grate within 3 to 4 minutes. (The igniter is active for 2 minutes. 

When you hit “start”, the auger turns continuously for 45 seconds to prime the burn grate. At 46 

seconds, the igniter is powered on; within 2 minutes, the heat from the igniter and the combustion air 
from the fans will have a small smoldering 

fi

 re started.

NOTE:

The only way to reactivate the igniter is to turn the cooker o

ff

  and let it go through the cool down 

cycle, or simply pull the plug for a hard reset at which point you can restart the cooker. Before restarting 

the Yoder, remove the grates and heat di

ff

 user and inspect the burn grate for any pellet over

fl

 ow. Remove 

all pellets from the burn grate area and from the pit 

fl

 oor if present.

12. Once the temperature reaches the set point, open the cooking chamber and carefully oil the grates 

with vegetable oil. You are ready to cook!

Shutting Down The Smoker

When 

fi

 nished cooking, push the power switch to the “o

ff

 ” position. The controller will begin its automatic 

shutdown procedure.

• 

The auger feed system will stop feeding fuel.

• 

The combustion cooling fan will continue to run until the 

fi

 re is burned clean.

• 

The fan will continue to run until the grill temperature reaches 125° F or 18 minutes, whichever 

occurs 

fi

 rst.

• 

When the procedure is complete, the fan and power LED will turn o

ff

 .

• 

Disconnect the Yoder from its power source. When the grill is completely cool, cover the grill to 

protect your investment and keep the pellets dry.

38

640 IGNITER AND THERMOCOUPLE COMPONENTS

ITEM #

PART #

DESCRIPTION

QTY.

1

W90777

YS, PELLET, 640 SMOKE CHAMBER, WELDMENT

1

2

1420WHN

NUT, WHIZ, 1/4-20

1

3

10X34HHSDS

SCREW, HEX HEAD, SELF DRILLING, 10 X 3/4

6

4

1420X1HB

BOLT, HEX, 1/4-20 X 1” LONG

1

5

91713

YS, WELDMENT, AUGER COVER BRKT, PELLET

1

6

W90812

YS, WELDMENT, FIREPOT MOUNT, PELLET

1

7

W91078

YS, WELDMENT, BURN POT, PELLET SMOKER

1

8

A90423

YS, IGNITER ASSEMBLY, PELLET SMOKER

1

9

A91413

YS, ASSEMBLY, THERMOCOUPLE, PELLET SMOKER

1