KRA Refrigeration System Installation, Operation & Maintenance Manual
L-3571 ENGLISH
7
I
NSTALLING
THE
R
EFRIGERATION
S
YSTEM
C
ONDENSING
U
NIT
Locate unit in a dry area where a constant source of circulated air is always available. Maximum air temperature for the system
to operate at full capacity is: 100°F/38°C measured at the condensing unit. Temperatures above this will result in reduced
capacity of the air condensing system and may cause compressor damage. Maximum water temperature for full capacity is
90°F/32°C. Air and water temperatures higher than those listed above will reduce system performance, capacity and ability to
maintain box temperature.
Any time a condensing unit is installed in an engine room, water must be provided to the unit by way of a single-station pump, or
a multi-station pump and a pump relay. The refrigeration condensing unit must have its own pump trigger. Any time a
condensing unit is installed in an enclosed space (i.e. a space that does not have airflow in and out equal to the airflow through
the condenser coil or a space that is less than 256 cu. ft./7.25 cu. m. per compressor horsepower), then the customer must
provide fresh air or water flow. Provide minimum water flow as shown in the table below for your particular unit.
If there are multiple units in a space, then add the minimum free area to get the minimum free area total for all of the units. This
also applies to the space airflow. For example, if a KRA 433X and a KRA 450X unit are in an enclosed space, the area and
airflow calculations are:
Table 1: KRA Condensing Unit Power Requirements, Dimensions, Weight
KRA
Model
Horse
Power
Voltage /
Frequency
Max Run
Amps
Height
in / cm
Width
in / cm
Depth
in /cm
Weight
lb / kg
KRA 433X 1161
1/3
115 / 60
6.3
17.77 / 45.1
8.94 / 22.7
14.5 / 37
58 / 26.3
KRA 433X 2361
1/3
230 / 60
2.38
17.77 / 45.1
8.94 / 22.7
14.5 / 37
57 / 25.8
KRA 433X 2251
1/3
220 / 50
2.4
17.77 / 45.1
8.94 / 22.7
14.5 / 37
59.8 / 27
KRA 433X 1161
Water-Cooled-Only
1/3
115 / 60
6.3
11.06 / 28.1
8.94 / 22.7
14.5 / 37
53 / 26.3
KRA 433X 2361
Water-Cooled-Only
1/3
230 / 60
2.38
11.06 / 28.1
8.94 / 22.7
14.5 / 37
52 / 25.8
KRA 433X 2251
Water-Cooled-Only
1/3
220 / 50
2.4
11.06 / 28.1
8.94 / 22.7
14.5 / 37
54.8 / 27
KRA 450X 1161
1/2
115 / 60
6
20.43 / 51.9
10.42 / 265
16.25 / 41.3
89 / 40.4
KRA 450X 2361
1/2
230 / 60
3
20.43 / 51.9
10.42 / 265
16.25 / 41.3
86 / 39
KRA 450X 2251
1/2
220 / 50
3.1
20.43 / 51.9
10.42 / 265
16.25 / 41.3
89 / 40.4
Table 2: Air-Flow and Water-Flow Requirements for KRA 4-Series Condensing Units
KRA
Model
Minimum Free Area
Cu. Feet / Cu. Meter
Air Flow
CFM / CMM
Minimum Water Flow
GPH / LPH
KRA 433X
96 / 2.72
200 / 5.66
90 / 340.69
KRA 433X
Water-Cooled-Only
96 / 2.72
Not applicable
90 / 340.69
KRA 450X
128 / 3.62
250 / 7.08
120 / 454.25
Area
96 Cu. Ft. + 128 Cu. Ft. = 184 Cu. Ft.
(2.72 Cu. M + 3.62 Cu. M = 6.34 Cu. M)
Airflow
200 CFM + 250 CFM = 450 CFM
(5.66 CMM + 7.08 CMM = 12.74 CMM)
