Catalogues

Bitzer 4TDC-12, Reciprocating compressor, Semihermetic, 4 Cylinders

Use this catalogue to identify the spare parts you need to repair your compressor. The OEM catalogue is crossreferenced with our spare parts database, matched items are highlighted. Some of our existing spare parts may not be shown because our database is incomplete (e.g. missing OEM P/N), or because we sell the items separatelly (typical example is the piston-connecting rod assembly). If you have any doubt please ask us.

All OEM manufacturer's names, part numbers, diagrams, products description and information are provided for reference and identification purposes only, and it is not implied that any part listed is the product of the OEM manufacturer.

Compressor description by Ralkin

General Octagon R410A/R32 Series Description: The Bitzer Octagon series (4FDC-5Y to 4NDC-20Y) comprises semi-hermetic reciprocating compressors specifically engineered for demanding pressure levels, such as systems using R410A and R32 at medium and high evaporation temperatures. Characterized by a robust housing, wear-resistant drive gear, and an efficient large-volume motor, these compressors offer high energy efficiency, quiet operation via patented pulsation mufflers, and reliable centrifugal lubrication.

### Model Identification Based on the data provided for the Octagon series, the model 4TDC-12 (specifically 4TDC-12Y) is decoded as follows:

  • 4: Index for the number of cylinders (4 cylinders).
  • T: Identification letter for bore x stroke.
  • D: Identification letter for R410A refrigerant compatibility.
  • C: Identification letter for the Octagon® series.
  • 12: Code for motor size.
  • Y: Identification letter for the standard ester oil charge (BSE55).

### Technical Features:

  • Design: Robust semi-hermetic housing with high pressure strength (HP side up to 53 bar, LP side up to 30 bar).
  • Lubrication: Centrifugal lubrication system ensuring optimum oil supply under extreme conditions.
  • Reliability: Wear-resistant drive gear with multilayer bearings and closed big-end connecting rods.
  • Efficiency: High cooling capacity driven by efficient working valves, minimal dead space, and an efficient large-volume motor.
  • Operation: Quiet and low-vibration operation due to optimized mass balance and integrated pulsation mufflers.
  • Protection: Electronic compressor monitoring via PTC sensors; optional discharge gas temperature sensor available.
  • Terminal Box: IP65 rated.

### Specifications & Data:

  • Model: 4TDC-12Y (part of the 4TDC-12 series)
  • Approved Refrigerants: R410A, R32
  • Displacement at 1750 RPM (60 Hz): 1468 CFH
  • Number of cylinders: 4
  • Oil Charge: 92 fl. oz of polyolester oil BSE55.
  • Weight: 318 lb
  • Housing Pressure Strength: High pressure side up to 53 bar, low pressure side up to 30 bar.
  • Pipe Connections (ODS):
    • Discharge Line (DL): 1 1/8 inch (28 mm)
    • Suction Line (SL): 1 3/8 inch (35 mm)
  • Electrical Data:
    • Motor Connection: Dual voltage 9 lead motor (part winding at 208/230 V Y/YY/3/60 Hz; DOL at 460 V Y/3/60 Hz).
    • Max. Operating Amps (MOA):
      • @ 208V: 53.1 A
      • @ 230V: 48.0 A
      • @ 460V: 24.0 A
    • Starting Current RLA (Amp.): 151/252 A @ 230V | 126.0 A @ 460V
  • Standard Components & Features:
    • Crankcase Heater: 0 .. 140 W self-regulating PTC heater (available in 115 V or 230 V).
    • Capacity Control: Blocked suction system 50% available as an option.
Item num.Ralco P/NOEM P/NDescription (from OEM manufacturer)Add
1KIT2312637284126gasket set.
2BRG23100
31113503bearing bush.
3BRG23100
31113503bearing bush.
4WAS23100
32050010thrust washer.
5WAS23100
32050010thrust washer.
630112703eccentric shaft.
7KEY2314038400123parallel key; steel DIN 6885.
930229844connecting rod / piston; Kit with left and right connecting rod/ piston.
2234775012bearing cover; complete.
24GKT2390337294903gasket; used in: 2; from year: ca. 05/21.
26GKT23003C38240131gasket ring; copper.
27BLTCMA10X030
38015606hexagon head screw; coated DIN 933, 10.9.
29GKT23006A
38240301Gasket Ring; aluminium DIN 7603.
30PLUCMA20A38091003Sealing Screw; DIN 908, 5.8.
32BRG23100
31113503bearing bush.
3630297701balance weight.
39WAS23110
31100403spacer sleeve; steel.
4034626646built-in motor; 9.2 kW, 4-pole 380..420V Y/YY-3-50Hz, 440..480V Y/YY-3-60Hz.
42SPRCM10X1238035801Set screw; coated DIN 916.
43KEY2E11038410105gib-headed key; steel DIN 6887.
4432110507oil splasher plate; steel.
45BLTCMA8X030
38034401Cheese Head Screw; ISO 4762, 10.9.
4631800002Hexsocket Cheese Head Screw; ISO 4762, 10.9.
47SPGCMW8
38215201thrust washer; DIN 127.
5430297601balance weight.
55GKT41801A
38200105disk; spring steel DIN 125.
56BLTCMA16X04038016603hexagon head screw; coated DIN 933, 10.9.
7037507901Train plug.
90GKT2039
37242115gasket.
94TER2301438091201threaded bolt; 6-Lead DIN 976.
95BLTCMA10X025
38030683Hexsocket Cheese Head Screw; DIN 912, 10.9.
96TER23100
34550701terminal plate; 6-Lead.
100PLU2E20036610021sealing plug.
10136610001Sealing Plug; brass.
10236150121Schrader valve; straight.
10336610321sealing plug; brass.
110TLT290138090213eye bolt; DIN 580.
120GRF231936131519shut-off valve; brazing and welding bush.
12136620119Protective Cap; Span of the jaw: 27 Plastic - GRP.
130GKT2031
37270401Gasket.
131GKT23102
37270405gasket.
132BLTCMA10X030
38034006cheese head screw; ISO 14579 -8.8 - A2K.
150GRF237736131577shut-off valve; PS45/DN25/S36/TX/28..; used in: 2.
15136620117Protective Cap; Span of the jaw: 20 Plastic - GRP.
158GKT23102
37270405gasket.
159BLTCMA10X030
38034006cheese head screw; ISO 14579 -8.8 - A2K.
16030406310valve plate.
161GKT23140
37251509gasket.
162GKT23150
37262301gasket; Retall.
16338005621hexagon head screw; DIN 931, 10.9.
164HED2310230236037cylinder head; complete.
16538005614hexagon head screw; DIN 931, 10.9.
19034321903crankcase heater; 0..140 W, 100-140 V (PTC) 100-140V.
190HTR23100
34321904crankcase heater; 0..140 W, 200-260 V (PTC) 200-260V.
200AMR2310037000305vibration damper set; yellow spring.
201AMR2310137000307vibration damper set; brown spring.
237RNG1035
37200339O-ring.
238GLS2300036180203sight glass; steel / glass.
23938022807hexagon head screw.
240GKT23100
37294902gasket; 14 - Hole.
241SRN210336200110suction gas filter.
24230523807housing cover.
24338005621hexagon head screw; DIN 931, 10.9.
47034702805protection device; SE-B2 24V-DC.
47034702804protection device; SE-B2 24V-50/60Hz.
470SEN2101
34703504protection device; SE-B3 110V/230V-50/60Hz.
47238040206cheese head screw; brass.
473BLT2315438050154Oval head screw; galvanized DIN 7985, 4.8.
473WASCMM1038200204Washer; brass DIN 125.
475NUTVT001
38130106hexagon nut; brass DIN 934.
47631101214spacer sleeve.
47737804901Bonding sheet; for grounding Bonding sheet.
479WASCMM1038200204Washer; brass DIN 125.
480BLT2385138050851Cheese head screw; galvanized DIN 7985, 4.8.
484BOX2310034350769terminal box; black IP66.
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