Daikin Compressor
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C series · HC series reciprocating refrigeration compressors
What a Daikin compressor code actually names
Daikin MR Engineering's current marine catalogue lists its deck units, packaged air conditioners and refrigeration condensing units with scroll compressors, so a reciprocating C or HC compressor normally belongs to an older provision or air-conditioning plant. Those compressors are ordered by the code stamped on their own plate, and the two families are told apart by the letters that code carries.
C55 · C75
C55 and C75 are the C designations that recur on parts lists, and a plate can carry more than that, such as 6C75-EB, with a figure in front and a suffix after the hyphen. Copy every character: the leading figure and the suffix belong to the identity and are not to be dropped. Valve plates and reeds, piston and ring sets, gasket kits, shaft seals and bearing sets are the usual scope.
HC55 · HC75
The HC codes are the neighbouring family, and the extra letter is not decoration: parts lists name HC55 and HC75 separately from C55 and C75, so a part drawn for one is not assumed to fit the other. Copy the marking in full from the compressor plate, including any leading figure or suffix.
Reading a Daikin compressor plate
Daikin Industries, Ltd., founded in 1924, is the maker behind the badge. Its marine air-conditioning and refrigeration systems come from two group companies, Daikin MR Engineering Co., Ltd. of Osaka (set up in 2008) and Daikin Applied Europe, so manuals and service papers for newer marine plant may carry either name. On board, the C or HC code and the full string of letters and figures stamped on the compressor's own plate are what identify the specific machine and its spare-parts range.
A C-series code and an HC-series code are read the same way, ordered differently
Both Daikin families share the same reciprocating principle, but the code stamped on the plate is what actually tells one from the other.
Daikin's C series and HC series are both reciprocating refrigeration compressors met on marine provision and air-conditioning plant, and neither family is answered from the maker name alone — the code stamped on the compressor's own plate, letters and figures included, is what actually identifies the machine. A full plate string such as 6C75-EB carries a figure in front and a suffix as well as the family letters, and each of them goes on the request.
The HC codes sit alongside the C series as the neighbouring family, and the extra letter is not decoration: parts are drawn per code rather than per family name, and parts lists keep HC55 and HC75 apart from C55 and C75. The full marking from the compressor plate is what belongs on the request, not a shortened version of it.
What a Daikin family resolves to
The C series and HC series are inspected the same way, and the usual scope is shared across both.
- Valve plates and reeds
- Piston and ring sets
- Gasket kits
- Shaft seals on open-drive compressors; a semi-hermetic unit has none
- Bearing sets
- Complete overhaul kits by code and cylinder count
The compressor plate is checked before the parts list on a Daikin request — a shortened or misread code returns the wrong valve plate or seal size.
Plate data that makes a Daikin enquiry quotable
The compressor's own plate is the reference for a correct match; on a compressor built into a condensing unit or packaged air conditioner, the unit's own plate is read as well. With the items below an enquiry can usually be priced in one pass; without them it comes back with a clarifying question first.
- Full code from the compressor plate — C or HC family with cylinder count
- Any figure in front of and suffix after the family letters, exactly as stamped
- Drive type: open (belt or coupling, with a shaft seal) or semi-hermetic (motor in the casing, no shaft seal)
- Refrigerant in service and the plant served: provision rooms or air conditioning
- Serial number stamped on the plate
- Which items are needed from the valve, piston, gasket or seal group
- Photograph of the compressor plate and of the part being requested
Tools for this equipment: the refrigerant number reader for the refrigerant named on the plant and compressor plates. On the air side of an air-conditioning plant, the air flow and duct calculator relates the air flow to the sensible load and the temperature difference, and gives the air changes per hour of a room.
A valve plate and a gasket kit are not answered alike
Requests naming Daikin compressor components arrive mixed, and the review differs by whether the valve plate or shaft seal is the item named, rather than by the machine as a whole.
The valve plate and the shaft seal are the items most likely to trigger a class or maker-specific check on a critical machine, and these go to an OEM-route review by default.
Gasket kits, bearing sets and other size-and-material consumables are ordinary supply questions, and a verified alternative can be reviewed on them where a buyer's approval requirements allow, with dimensional and material documentation checked at RFQ stage. Vessel Core is an independent spare parts supplier and marks the proposed route against each line on the list, so a mixed request naming both kinds of item is answered by line, not as one blanket route.
Daikin compressor parts — questions from the engine room
Which Daikin compressor families come up most often in spare-parts requests?
C series and HC series are the two Daikin marine reciprocating compressor families seen on board. Both are identified from the code stamped on the compressor's own plate, and quoting that code in full is what actually opens the enquiry.
What is the difference between the C series and HC series codes?
The extra H is the difference that matters: parts lists name C55 and C75 separately from HC55 and HC75, and parts are drawn per code rather than per family name. Plates can also carry a figure in front and a suffix, as in 6C75-EB, so the full string is copied rather than the family letters alone.
What parts are ordered on a Daikin compressor request?
Valve plates and reeds, piston and ring sets, gasket kits, shaft seals and bearing sets are the usual scope on either family. The full code from the compressor plate is what decides which of them actually fit.
What should a Daikin spare-parts RFQ contain?
A workable request lists the full code from the compressor plate — C or HC family, cylinder count and the letters and figures that follow it — plus which items are needed from the valve, piston or seal group. A photograph of the compressor plate and of the part being requested settles most of the remaining questions in one pass.
Can a Daikin compressor part be identified without a part number?
Often yes. The decisive evidence is the full code from the compressor plate — C or HC family, cylinder count and the letters and figures that follow it — together with a photograph of the removed item beside the nameplate. A part-book page or an earlier order line for the same unit is equally usable as reference.
Is Vessel Core connected to Daikin?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with Daikin, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Submit your RFQ now.
Copy the full marking from the compressor plate exactly as written — C and HC parts are drawn per code, and a figure in front or a suffix, as in 6C75-EB, is part of the identity, not a variant of a shorter code. Add the refrigerant in service, whether the compressor is open-drive or semi-hermetic, and the component description.
