8 First Outs
Page 124 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
8.2 Configuration
8.2.1 Running Interlock Circuit
The burner will shut down when the MM detects a first out trigger for the non-recycle and recycle
functions. Local codes may require the first outs to be tied into the burner run circuit, and it is
recommended that they are connected to terminal 53 on the MM. A break in circuit will cause the
burner to turn off but will not cause a lockout. On the first log screen, the MM will display which first
out has failed.
Note: Do not tie in first outs to terminal 54 (air proving switch) to turn the burner off as the MM will
lockout with no air pressure, rather than displaying what first out has failed.
The schematic below shows an example of wiring first out to terminal 53 on the Mk8 MM.
To enable first outs, the following expansion must be set.
Expansion Option Description Setting
110 First outs function 1
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