R744 compressors subcritical application

All connections to the pipes are made of steel.

DANGER

R744 is an odourless and colourless gas and cannot be perceived directly in case of emission!

Lost of consciousness and danger of suffocation by inhaling higher concentrations!

Avoid R744 emission and uncontrolled deflating, particularly in closed rooms!

Aerate closed machine rooms!

Make sure that the safety regulations in accordance with EN378 are complied with!

DANGER

Liquid R744 evaporates quickly, cools down at the same time and forms dry ice!

Danger of cold burns and frost bites!

Avoid uncontrolled deflating of R744!

When filling the system with R744, wear gloves and goggles!

In addition to the safety references listed in this document, it is essential to observe the references and residual risks in the respective operating instructions!

KB-120: Operating Instructions Semi-hermetic reciprocating compressors for subcritical R744 applications

SL models

Shut-off valves for R744 compressors, subcritical application (SL models).
For most compressors there is only one listed standard valve (in contrast to e.g. compressors for transcritical application).
Ø: diameter
HP: high pressure
LP: low pressure
Compressor	Side	Connection at compressor	Valve	Ø of suitable brazing pipes	Ø of suitable welding pipes
2NSL .. 2FSL	HP	12 mm // 1/2''	Di12/Da17	1/2''	17.2 mm (DN10)
2NSL .. 2FSL	LP	16 mm // 5/8''	Di16/Da22	5/8'' // 16 mm	21.3 mm (DN15)
2ESL .. 2CSL	HP	16 mm // 5/8''	Di16/Da22	5/8'' // 16 mm	21.3 mm (DN15)
2ESL .. 2CSL	LP	22 mm // 7/8''	Di22/Da30	7/8'' // 22 mm	26.9 mm (DN20)
4DSL .. 4CSL	HP	22 mm // 7/8''	Di22/Da30	7/8'' // 22 mm	26.9 mm (DN20)
4DSL .. 4CSL	LP	28 mm // 1 1/8''	Di28/Da35/RL	1 1/8''	33.7 mm (DN25)
4FSL .. 4ESL	HP	16 mm // 5/8''	Di16/Da22	5/8'' // 16 mm	21.3 mm (DN15)
4FSL .. 4ESL	LP	28 mm // 1 1/8''	Di28/Da35/RL	1 1/8''	33.7 mm (DN25)
4VSL	HP	22 mm // 7/8''	Di22/Da30	7/8'' // 22 mm	26.9 mm (DN20)
4VSL	LP	28 mm // 1 1/8''	Di35/Da42 Di35/Da42/UL	1 3/8'' // 35 mm	42.4 mm (DN32)
4TSL .. 4NSL	HP	28 mm // 1 1/8''	Di28/Da35/TX	1 1/8''	33.7 mm (DN25)
4TSL .. 4NSL	LP	35 mm // 1 3/8''	Di35/Da42 Di35/Da42/UL	1 3/8'' // 35 mm	42.4 mm (DN32)

ME models with high standstill pressures

Shut-off valves for R744 compressors, subcritical application with high standstill pressure (ME models).
For most compressors there is only one listed standard valve (in contrast to e.g. compressors for transcritical application).
Ø: diameter
HP: high pressure
LP: low pressure
Compressor	Side	Connection at compressor	Valve	Ø of suitable brazing pipes	Ø of suitable welding pipes
2MME .. 2FME	HP	12 mm // 1/2''	Di12/Da17	1/2''	17.2 mm (DN10)
2MME .. 2FME	LP	16 mm // 5/8''	Di16/Da22	5/8'' // 16 mm	21.3 mm (DN15)
2EME .. 2DME	HP	16 mm // 5/8''	Di16/Da22	5/8'' // 16 mm	21.3 mm (DN15)
2EME .. 2DME	LP	22 mm // 7/8''	Di22/Da30	7/8'' // 22 mm	26.9 mm (DN20)
4DME	HP	22 mm // 7/8''	Standard: Di22/Da30/TX Option: Di22/Da30/TT	7/8'' // 22 mm	26.9 mm (DN20)
4DME	LP	28 mm // 1 1/8''	Di28/Da35	1 1/8''	33.7 mm (DN25)
4FME(M) .. 4EME(M)	HP	16 mm // 5/8''	Standard: Di16/Da22/TX Option: Di22/Da30/TT	5/8'' // 16 mm	21.3 mm (DN15)
4FME(M) .. 4EME(M)	LP	28 mm // 1 1/8''	Di28/Da35	1 1/8''	33.7 mm (DN25)
4TME(M) .. 4PME(M)	HP	28 mm // 1 1/8''	Standard: Di28/Da35/TX Option: Di28/Da35/TT	1 1/8''	33.7 mm (DN25)
4TME(M) .. 4PME(M)	LP	35 mm // 1 3/8''	Di35/Da42	1 3/8'' // 35 mm	42.4 mm (DN32)
6TME(M) .. 6PME(M)	HP	35 mm // 1 3/8''	Di35/Da42	1 3/8'' // 35 mm	42.4 mm (DN32)
6TME(M) .. 6PME(M)	LP	42 mm // 1 5/8''	Di41/Da48	1 5/8''	48.3 mm (DN40)
8VME .. 8PME	HP	DN50	Di54/Da60	2 1/8'' // 54 mm	60.3 mm (DN50)
8VME .. 8PME	LP	DN65	Di68/Da76	2 5/8''	76.1 mm (DN65)

Information

Nominal diameters (DN) are not actual dimensions!

The nominal diameters DN10 .. DN200 only indicate ranges! The number is not a quantifiable unit, it is only indirectly related to the diameters of the connections and should not be used in calculations.