Carrier AquaSnap 30RB Series Installation, Operation And Maintenance Instructions page 55

Duct installation examples (continued)
Case 4
For units 30RB 372 and 402 with three V-shaped air condensers, where the middle V-shaped condenser 2 belongs to both
circuits A and B (see chapter "Number of fans per refrigerant circuit for different unit sizes").
Similar recommendations apply to units 30RB 602 and 672 that also have overlapping air condenser circuits for V-shaped
condenser 2.
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
EV22-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: EV22 + EV31 + EV32
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
One separate duct for fan EV22
Discharge twinning possible: (EV31 + EV32) + EV22
ATTENTION: fans EV21 and EV22 must never be
twinned, as this may cause air short-circuiting between
circuits A and B.
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