LMV Series Technical Instructions
Document No. LV3-1000
SCC Inc. Page 5 Appendix A
Fresh Air 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 fresh air 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 fresh air damper will begin driving
open.
3. Once the fresh air damper drives fully open, the fresh air damper end switch will close,
and the burner will turn on.
4. The fresh air 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 fresh air damper
actuator.
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