Ingersoll-Rand ReliaTel, Manual, Page: 153 / 176

RT-SVD03L-EN 153
Table 102. Condenser fan/compressor sequence - standard efficiency
Unit Size
(Ton)
Compressor Staging Sequence
Condenser Fan
Output
O/A
Temp. (°
F)
Step 1 Step2 Step 3 Output A Output B Fans “Off”
27.5 - 30
CPR1 (a)
NA
Fan #2 70
Fan #3 90
CPR1, 2
Fan #2 -10
Fan #3 60
35
CPR1 (a)
NA
Fan #2 65
Fan #3 85
CPR1, 2
Fan #2 -20
Fan #3 55
40
CPR1 (b)
Fan #2 50
Fan #3, 4
70
CPR2
(c)
Fan #2 20
Fan #3, 4
60
CPR1, 2
Fan #2 -30
Fan #3, 4
50
50
CPR1 (b)
Fan #2 20
Fan #3, 4
60
CPR2, 3 (d)
Fan #2 -10
Fan #3, 4
55
CPR1, 2, 3
Fan #2 -30
Fan #3, 4
50
Notes:
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 CPR 2 & 50 CPR 2,3), Y1 + Y2 =
CPR1,2 (40 CPR 1,2 & 50 CPR 1,2,3)
3 . During active dehumidification all compressors will be staged “On”. For units equipped with
four condenser fans (40 and 50 Ton), the condenser fan output states will be controlled based
on the O/A temperature. If O/A is above 85°F, all condenser fan outputs will be energized. If
O/A falls below 80°F, Output B will de-energize and will not re-energize again until the O/A
rises above 85°F. For units configured with three condenser fans (27.5 to 35 Ton), a
maximum of two condenser fans will energize. Output A will energize above 85°F and de-
energize when the O/A falls below 80°F; Output B will remain de-energized during active
dehumidification. If O/A falls below 80°F, Output A will de-energize and will not re-energize
again until O/A rises above 85°F.
(a) Single circuit, manifolded compressors pair.
(b) First Stage, Number one refrigeration circuit, Standalone compressor is “On”.
(c) First Stage is “Off”, Number two refrigeration circuit, standalone compressor is “On”.
(d) First stage is “Off”, Number two refrigeration circuit, manifolded compressor pair is “On” operating simultaneously.
R Re elliia aT Te ell ™ ™ -- C Co on nd de en nsse err F Fa an n