Trane ReliaTel - Odyssey Independent Circuit Heat Pump Condenser Fan Control

134 RT-SVD03G-EN
ReliaTel Condenser Fan Control Logic
Odyssey Independent Circuit Heat Pump Condenser Fan Control
For Odyssey Independent Heat Pump units, the Outdoor Fan B output will be energized whenever
Compressor Circuit 1 is energized. The Outdoor Fan A output will be energized whenever
Compressor Circuit 2 is energized. These statements hold true for active Heating and Cooling
modes except during active Defrost.
50 CPR 1** CPR 2, 3*** CPR 1, 2, 3
Fan #2
Fan #3, 4
20
60
Fan #2
Fan #3, 4
-10
55
Fan #2
Fan #3, 4
-30
-30
3.3.3.3.
1. The Compressor(s) listed under each step are the operating compressors. On 27.5 to 35 Ton units with Lead/Lag, CPR1
will alternate but the fan sequence will remain the same. On 40 & 50 Ton units with Lead/Lag, the compressor(s) in step
2 & 3 will alternate and the fan sequence listed for that step will be in operation.
2. Conventional thermostat sequence: Y1=CPR1, Y2=CPR2 (40 & 50 CPR 2,3), Y1 + Y2 = CPR1,2 (40 & 50 CPR 1,2,3)
3. For RTRM 8.0+, the fan off temperature is 45ºF.
* Single circuit, manifolded compressors pair.
** First Stage, Number one refrigeration circuit, Stand alone compressor is “On”.
*** First Stage is “Off”, Number two refrigeration circuit, manifolded compressor pair is “On” operating simultaneously.
Figure 75. Condenser Fan Location
Table 47. Condenser Fan/Compressor Sequence
Unit Size Compressor Staging Sequence Condenser Fan Output
O/A Temp.
(°F)
(Tons) Step 1 Step2 Step 3 Output A Output B Fans "Off"