Technical Instructions LMV Series
Document No. LV3-1000
Appendix A Page 30 SCC Inc.
Stack Damper (continued)
Operation
1. When there is no call for heat from the RWF5x load controller, the internal contact
between terminals 1N and 1P will be open. Both CR-1 and CR-2 coils will be de-
energized, and the stack damper will be closed.
2. When the RWF5x load controller receives a call for heat, the internal contact between
terminals 1N and 1P will close. Terminal 1P will be energized as long as the burner on /
off switch is on. Coil CR-1 will be energized, closing the CR-1 contact. As long as the
LMV3 is not in alarm (CR-3 contact is closed), the stack damper will begin driving open.
3. Once the stack damper drives fully open, the stack damper end switch will close, and
the burner will turn on.
4. The stack damper will remain open until the fan turns off. Once the fan turns off,
contact CR-2 will open and un-latch the circuit.
Important Notes
1. The described procedure cannot be used with continuous fan.
2. The burner startup cycle will be lengthened by the stroke time of the stack damper
actuator.
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