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Pneumatic Heavy Duty Refrigeration Compressors
APPLICATION NOTES :

The salient features like low noise level, vibrationless running and light weight make FK/GK compressors ideal for mobile applications like bus/ train/ ship airconditioning, refrigerated vans, trucks, trailers and containers. FK/GK compressors are also ideal for water coolers, display cabinets, deep freeze cabinets and air-conditioners.
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KIRLOSKAR PNEUMATIC REFRIGERATION AND AIR CONDITIONING COMPRESSOR 'FK/GK' SERIES
 
FEATURES :
Crankcase is made of high grade cast iron and is heat treated for stress relieving. Fine bored and honed cylinders are integral with the crankcase, resulting in mirror-smooth running surface.
Bottom cover, bearing covers, cylinder covers are also made of high grade cast iron, heat treated for stress relieving and machined with great accuracy, keeping in view the interchangeability of all the parts.
Crankshaft is of S. G. iron, perfectly balanced statically and dynamically. The bearing surfaces are ground and polished to fine tolerances. The shaft seal is of rotary type and continuously immersed in oil supplied through the drilled crankshaft.
Connecting rods and pistons are of light weight aluminum alloy. The piston is provided with one compression ring and one oil scraper ring.
Force feed lubrication is ensured by crankshaft driven gear pump incorporated in rear bearing cover.
The oil level may be checked by a sight glass provided in the crankcase.
 

TECHNICAL DATA

FK/GK compressors are suitable for use with R-12, R-22, R-114 & R-134a

Description
FK3
FK4
GK25
No. of Cylinders
2  
4  
4  
Bore                                                                        mm
55  
55  
70  
Stroke                                                                      mm
49  
49  
55  
Displacement at 1450 RPM.                                   m3/hr
19.84  
40.52  
73.65  
Weight without flywheel                                         kg
29  
65  
92  
Maximum speed, RPM with                                    R-12                                                                                 R-22
2500  2000  
2500   2000  
2000   2000  
Minimum speed, RPM with R-12 & R-22
900  
900  
900  
Maximum condensing temp.   oC                             R-12                                                                                 R-22
70  60  
70  60  
70   60  
Maximum evaporating temp.   oC     R-12 & R-22
10  
10  
10  
Oil change                                                                L
1.5  
3  
4  

Dimensions in mm.                                                   Length=  

Width=     Height=  

320  
455  
470  
235  
305  
355  
404  
437  
465  
 
 
Refrigerant R-22 2000 RPM
PERFORMANCE CHART
Compressor
Evaporating Temperature oC
Condensing Temperature
Refrigerant R-12 2000 RPM
Refrigerant R-22 2000 RPM
40oC
50oC
60oC
40oC
50oC
k cal/hr
kW
k cal/hr
kW
k cal/hr
kW
k cal/hr
kW
k cal/hr
kW
FK3
+10
15700
4.6
14100
5.1
12700
5.7
24800
6.8
21800
7.9
+5
13000
4.5
11700
4.9
10200
5.3
20800
6.4
18200
7.3
0
10800
4.2
9400
4.6
8300
4.7
16800
6.0
14800
6.8
-10
7000
3.7
6000
3.9
5000
4.5
11000
5.3
11200
6.0
-20
4150
3.0
3500
3.1
2800
3.3
6800
4.6
5500
5.1
-30
2300
2.3
1600
2.4
1200
2.5
4000
4.0
2900
4.3
FK4
+10
28400
9.0
28400
9.0
25500
10.3
52270
11.7
46100
13.8
+5
23500
8.8
23500
8.8
21000
9.8
43400
10.9
38400
12.3
0
19300
8.3
19300
8.3
17000
9.3
35450
10.0
30900
11.3
-10
12000
6.9
12000
6.9
10300
7.8
22500
8.5
19500
9.0
-20
7000
5.4
7000
5.4
5400
6.3
13400
6.9
11150
7.4
-30
3400
4.3
3400
4.3
2200
4.7
7200
5.3
5000
5.7
GK25
+10
52900
13.7
43900
15.9
40500
17.9
90800
22.1
79200
25.0
+5
45000
13.3
40000
15.1
34100
17.4
76300
20.8
65900
23.1
0
38000
12.7
33300
14.0
28700
15.6
62500
19.4
53300
21.5
-10
25000
11.0
22000
11.7
18500
12.6
40000
16.5
33800
18.1
-20
15000
8.4
12900
9.0
10500
9.8
24200
13.3
20000
14.2
-30
8200
6.0
6200
6.5
4700
6.8
12500
10.0
9600
10.6
 
Notes :
Capacities based on :
Liquid sub-cooling of 0 deg. C.
Return gas temperature 20 deg. c
 
 
 
   
 
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