Flagro FVO-400RCBT Operating Instructions Manual page 14

Indirect fired space heaters bulk tank
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REMOTE SENSING OF SAFETY LOCKOUT: The SAFETY SWITCH in the
530SE CONTROL BOX is equipped with a contact allowing remote sensing of
burner lockout. The electrical connection is made at terminal 4 (●) on the SUB-
BASE. Should lockout occur the 530SE CONTROL BOX will supply a power
source of 120Vac to the connection terminal. The maximum allowable current
draw on this terminal (4) is 1 Amp.
WARNING: If a neutral or ground lead is attached to this terminal, the
CONTROL BOX on the burner will be damaged should lockout
occur.
APPLICATION FIELD WIRING
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