Page 24
Sequence of Operation
EL072/240XA − BLOWER COOLING SEQUENCE OF OPERATION (refer to gures 7, 8) – ALL (NO ECONO)
NOTE – An A96 alarm condition will de-energize K232 inverter protection relay, opening K232-2 contacts shutting o
thermostat power.
First Stage Cooling Call
Y1 cooling demand energizes both C1 and Y1 inputs to A183 control board.
A183 sends RL signal to A96 RL through K264-1 N.C. contacts starting forward motion of blower B3 in low speed.
Second Stage Cooling Call
Y2 cooling demand energizes K264 inverter speed switching relay.
K264-1 opens switching the A183 RL signal to A96 RM changing the forward motion of the blower to medium speed.
Third Stage Cooling Call
Y3 cooling demand energizes Y2 input to A183 control board.
A183 sends RH signal to A96 RH changing the forward motion of the blower to high speed.
EL072/240XA − BLOWER HEATING SEQUENCE OF OPERATION (refer to gures 7, 8) – ALL
W1 heat demand energizes both K43 economizer relay and W1 input to A183 control board.
When K43−1 closes, the G input to A183 control board is energized.
A183 sends RH signal to A96 starting forward motion of blower B3 in high speed.
NOTE – An A96 alarm condition will de-energize K232 inverter protection relay, opening K232-2 contacts shutting o
thermostat power.
To Next Page
Loading...
Need help?
General
