Carrier AquaSnap 30RB Series Installation, Operation And Maintenance Instructions page 54

Duct installation examples (continued)
Case 3
For 30RB 302 and 342 units with three V-shaped air condensers, where the middle V-shaped condenser 2 and fan EV 21
only belong to circuit A (see chapter "Number of fans per refrigerant circuit for different unit sizes").
Solution 1
1 Fan motor access hatches (provide a 700 x 700 mm hatch) for each single and dual duct
solution 1
One separate duct per fan
Circuit a
EV11-EV12-EV21
Circuit B
EV31-EV32
Each fan discharge to the outside has its own duct.
Circuit a
Discharge twinning possible: EV11 + EV12 + EV21
Circuit B
Discharge twinning possible: EV31 + EV32
54
Solution 2
solution 2
Circuit a
One separate duct for the EV11 + EV12 fan pair
One separate duct for fan EV21
Discharge twinning possible: (EV11 + EV12) + EV21
Circuit B
One separate duct for the EV31 + EV32 fan pair
ATTENTION: fan EV21 must never be twinned with
fans EV31 and EV32, as this may cause air short-
circuiting between circuits A and B.