System information

12
Legend
FLA - Full load current, A
IFM - Indoor fan motor
LRA - Locked rotor current, A
MCA - Minimum circuit current, A
OFM - Outdoor fan motor
RLA - Rated load current, A
Notes:
1. In compliance with IEC (International Electrotechnical Commisssion) require-
ments for multi-motor and combination load equipment (refer to IEC Articles
430 and 440), the overcurrent protective device for the unit shall be power
supply fuse.
2. Minimum wire size is based on 60°C copper wire. If other than 60°C wire is
used, or if length exceeds wire length in table, determine size from IEC.
3. Unbalanced 3-phase supply voltage: Never operate a motor where a phase
imbalance in supply voltage is greater than 2%. Use the following formula to
determine the percentage of voltage imbalance.
max voltage deviation from average voltage
average voltage.
Example: Supply voltage is 400-3-50.
AB = 393 V
BC = 403 V
AC = 396 V
393 + 403 + 396 1192
33
Determine maximum deviation from average voltage.
(AB) 397 - 393 = 4 V
(BC) 403 - 397 = 6 V
(AC) 397 - 396 = 1 V
Maximum deviation is 6 V. Determine percent of voltage imbalance.
6
397
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
Important: If the supply voltage phase imbalance is more than 2%, contact your
local electric utility company immediately.
Average voltage = =
= 397
= 1.5%% Voltage imbalance = 100 x
% Voltage imbalance = 100 x
Table 3 - Electrical data
50JZ Power Voltage Compressor OFM IFM Electric heat Power supply Disconnect size
supply range
V-ph-Hz V RLA LRA FLA FLA Nom. kW FLA MCA Fuse or circuit breaker, A FLA LRA
- - 7.5 10 7 35
024 400-3-50 380-420 4.5 32.0 0.8 1.1 6.5 9.4 19.2 20 18 44
8.7 12.6 23.2 25 22 48
- - 9.0 10 9 39
030 400-3-50 380-420 5.2 35.0 0.8 1.7 6.5 9.4 20.7 20 20 49
8.7 12.6 24.7 25 23 52
13.0 18.8 32.5 35 30 59
- - 10.9 15 11 51
036 400-3-50 380-420 6.5 46.0 0.8 0.8 6.5 9.4 22.7 25 21 61
8.7 12.6 26.6 30 25 64
13.0 18.8 34.4 35 32 70
- - 13.6 15 14 58
6.5 9.4 25.3 30 24 67
048 400-3-50 380-420 6.7 50.0 1.3 3.9 8.7 12.6 29.3 30 28 71
13.0 18.8 37.0 40 35 77
17.4 25.1 45.0 45 43 83