Harman Stove Company Accentra Service Training page 45

Includes all pellet burning units

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Draft Differential Switch

Diaphragm switch which is used to monitor the

negative draft pressure in the firebox. The older blue

switch can be used as a normally open (NO) or

normally closed (NC) switch. In the Harman Pellet

stoves, it is used as normally open. Notice the wire

terminals are labeled NO, and NC The hose ports

correspond to the wiring positions. When built, the

hose port for NC is broken off and the wire terminal

For NC is bent. This is to help prevent improper hook-

up. The feed motor and igniter are wired through this

switch and will not receive power if there is no draft,

or if the draft is too low. The switch actuates at -.17"

W.C. Even though the indicator light may be on

showing power to the feed motor, the switch could still

be intercepting the flow of current. The newer black

switches can only be used as normally open.

Harman Pellet Service Training

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