Carrier 30RBM 330 - Unit Components and Characteristics (cont.); Variable Speed Ventilation Benefits

44

CKT A CKT B CKT A CKT B CKT A
30RBM/30RBP 300-330
30RBM/30RBP 360-400 30RBM/30RBP 430-470
CKT B
30RBM/30RBP
160
30RBM/30RBP
180-200-220-260
Elec
11
21
22
11
12
21
22
11
12
21 31
32
Elec
Elec
CKT A
CKT A
CKT B
CKT A CKT BCKT B
30RBM/30RBP 520
11
12
21 31
32
22
11
21 31
32
22
41
42
11
12
21 31
32
22
41
42
11
12
21 31
32
22
Elec
Elec
Elec

      






 A EV11 EV11 EV11 EV11
 EV21 EV21+EV22 EV21+EV22 EV21 EV21
 A EV11 EV11+ EV12 EV11+ EV12 EV11 EV11
 EV21 EV21+ EV22 EV21+ EV22 EV21 EV21
300-330 A EV11 EV11 + EV12 EV11 + EV12 EV11 EV11
 EV31 EV31+EV21 EV31+EV21+EV32 EV31+EV21+EV32 EV31 EV31
 A EV11 EV11+ EV12 EV11 + EV12 + EV22 EV11 + EV12 + EV22 EV11 EV11
 EV31 EV31+ EV32 EV31+ EV32 + EV21 EV31+ EV32 + EV21 EV31 EV31
430-470 A EV21 EV21+EV11 EV21+EV11+EV22 EV21+EV11+EV22 EV21 EV21
 EV31 EV31+EV41 EV31+EV41+EV32 EV31+EV41+EV32+EV42 EV31+EV41+EV32+EV42 EV31 EV31
520 A EV11 EV11 + EV21 EV11 + EV21 + EV12 EV11 + EV21 + EV12 + EV22 EV11 + EV21 + EV12 + EV22 EV11 EV11
 EV31 EV31 + EV41 EV31 + EV41 + EV32 EV31 + EV41 + EV32 + EV42 EV31 + EV41 + EV32 + EV42 EV31 EV31
11.14 - Variable speed ventilation
The variable speed drives on the fans are used to optimise the
efciency of the unit depending on the conditions of use (air
temperature, circuit capacity) and hence improve the seasonal
efciency (ESEER and SCOP).
All fans in the same refrigerant circuit are controlled by a single
variable speed drive.
Therefore, they operate together at the same rotational speed.
All variable-speed fans are controlled by the unit controller.
Each variable-speed fan is equipped with its own variable-speed
drive.
The speed is controlled independently for each refrigerating
circuit,
This rotation speed at full load or partial load for each circuit is
controlled by an algorithm that continuously optimises the
condensation temperature to obtain the best unit energy efciency
(EER and COP) whatever the operating conditions.

The motors of a same circuit are electrically protected by the
variable frequency drive in case of short-circuit, locked rotor
or general overload.
Each variable frequency drive follows a variable current
characteristic, based on the frequency from 5 to 50 Hz and the
number of fans controlled.
In case of fan failure (e.g. motor disconnected) the variable
frequency drive will detect this problem and an alert will be
sent to the user interface.
Refer to the unit's control manual for the list of alarms.