Trane Voyager Commercial Installation, Operation And Maintenance Manual page 64

S S t t a a r r t t u u p p
Table 38. Condenser fan/compressor sequence - std efficiency (continued)
Compressor Staging Sequence
Unit Size
(Ton)
Step 1
CPR1 (b)
50 VAV only CPR2, 3
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 hot gas reheat 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 hot gas reheat. 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.
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Condenser Fan Output
Step2 Step 3 Output A
Fan #2
Fan #2
(d)
Fan #2
CPR1, 2, 3
O/A Temp. (°F)
Output B
Fans "Off"
20
Fan #3, 4
60
-10
Fan #3, 4
55
-30
Fan #3, 4
50
RT-SVX34R-EN