Olsen LRF65 - Page 22

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240011511 REV. C [05/31/2017]
APPENDIX C - SEQUENCE OF OPERATION AND TROUBLESHOOTING
HLRF Humidity control is connected. Humidier connections are energized when the oil burner motor is energized.
Mode Action System Response
HEAT Thermostat call for heat "W"
The 24 VAC input signal is passed to pin 2 of P1 and will drive the K1 relay that provides
dedicated contacts to the T-T input of the oil primary control. Blower runs on heating speed
prole.
COOL
Thermostat calls for single
stage cooling or second stage
of two stage cooling "Y/Y2"
The 24 VAC input signal is passed to pin 14 of P1. Blower runs on cooling speed prole.
Thermostat calls for rst stage
of two stage cooling "Y1" while
"Y/Y2" is not calling
The 24 VAC input signal is passed to pin 6 of P1. Blower runs at 80% of cooling speed
prole.
FAN Thermostat calls for fan "G"
The 24 VAC input signal is passed to pin 15 of P1. Blower runs at continuous low speed
prole which is 50% of cooling speed.
DEHUMID
Thermostat calls for
Dehumidication "DH"
The 24 VAC input signal is passed to pin 10 of P1. Blower runs according to "Y1" and
"Y/Y2" calls as noted above.
REVERSING
VALVE
Thermostat calls for reversing
valve "O"
The 24 VAC input signal is passed to pin 9 of P1. Blower runs according to "Y1" and
"Y/Y2" calls as noted above.
Table C-2: 1168-1 ECM Tap Board Sequence of Operation (LRFV)
Thermostat Input LEDs (LED 1-5, LED 8)
Six green LEDs are placed behind their respective thermostat connections (Y1, Y/Y2, G, DH, O, W) and
illuminate whenever a call is present.