Danfoss Electronics CPCE Data Sheet

Data sheet

Hot gas bypass regulator, type CPCE
Liquid gas mixer, type LG (accessory)

CPCE hot gas bypass regulator adapt compressor
capacity to actual evaporator load.

They are designed for installation in a bypass line
between the low and high pressure sides of the
refrigeration system, for hot gas injection
between the evaporator and thermostatic
expansion valve.

Injection should be arranged to occur through
an LG liquid gas mixer.

Features

Approvals UL listed, file SA7200

CPCE hot gas bypass regulator

• Superior control accuracy

• Direct connection to system suction line
regulates hot gas injection independent
of evaporator pressure drop

• The regulator increases evaporator gas
velocity, thus ensuring better oil return to
compressor

• Protection against too low an evaporating
temperature, i.e. prevents evaporator icing

• May be used in the following EX range:
Category 3 (Zone 2)

LG liquid gas mixer

• LG provides homogeneous mixing of the
liquid and hot gas refrigerant injected into the
evaporator

• Prevents high suction superheat by combining
hot gas injection with expansion valve
characteristics

• LG can be used for hot gas defrosting or
reverse cycle systems

© Danfoss | DCS (az) | 2018.11 DKRCC.PD.HF0.4B.02 | 1

Data sheet | Hot gas bypass regulator type CPCE, Liquid gas mixer type LG (accessory)

Technical data

Refrigerants

Regulating range

Maximum working pressure

Maximum test pressure

Maximum differential pressure

Maximum media temperature

Minimum media temperature -50 °C

This product is evaluated for R290, R600, R600a,
R1234ze, R1270 by ignition source assessment in
accordance with standard EN13463-1.

Ordering Hot gas bypass regulator

Connection

Typ e

CPCE 12

CPCE 12 – –

CPCE 15

CPCE 22 –

1)

The rated capacity is the regulator capacity at:

- evaporating temperature t

- condensing temperature tc = 30 °C,

- reduction of suction temperature / suction pressure ∆ts = 4 K.

Flare

[in]

1

/

2

– –

[mm] [in]

12 –

–

= -10 °C,

e

R22, R1234ze *), R1270 *), R134a, R290 *), R404A, R407A, R407C, R407F,
R448A, R449A, R450A, R452A, R507A, R513A, R600 *), R600a *)

*) only LG 12-16 and LG 16-22

p

= 0 – 6 bar

e

Factory setting = 0.4 bar

PS/MWP = 28 bar

Pe = 31 bar

Δp = 18 bar

140 °C

For complete list of approved refrigerants,
visit www.products.danfoss.com and search for
individual code numbers, where refrigerants are
listed as part of technical data.

Rated capacity 1)

[kW]

Solder

[mm]

–

1

/

12 17.4 7.9 16.4 19.0 034N0082

2

5

/

16

8

7

/

22 34.0

8

R22

R134a

17.4 7.9

25.6 11. 6

15. 2

R404A/

R507

16.4 19.0

24.2

32.0 3 7.1

R407C

27. 9 034N0083

Code no.

034N0081

034N0084

REACH requirements

Sizing

Liquid gas mixer

[in]

5/

7/

8

8

8

8

Outlet

ODM

[mm] [in]

16

22

28

35

1

/

2

1

/

2

5

/

8

7

/

8

Typ e

LG 12 – 16

LG 12 – 22

LG 16 – 28 1 1/

LG 22 – 35 1 3/

All Danfoss products fulfill the requirements in
REACH.
One of the obligations in REACH is to inform
customers about presence of Candidate list
substances if any, we hereby inform you about
one substance on the candidate list:

For optimum performance, it is important
to select a CPCE valve according to system
conditions and application.

The following data must be used when sizing
a CPCE valve:

y Refrigerant: HCFC, HFC and HC
y Minimum suction temperature: ts in [°C] / [bar]
y Compressor capacity at minimum suction

temperature: Q

in [kW]

1

Connection

Inlet hot gas

ODF

Inlet liquid

ODF

[mm] [in]

12 5/

12 7/

16 1 1/

22 1

8

8

8

3

/

8

an O-ring used in this product contains
Diisopentyl phthalate (CAS no: 605-50-5) in a
concentration above 0.1% w/w.

y Evaporator load at minimum suction

temperature: Q2 in [kW]

y Liquid temperature ahead of expansion valve:

t

[°C]

l

y Reduction of suction temperature/suction

pressure in [K]
y Connection type: flare or solder
y Connection size in [in] or [mm]

Code no.

[mm]

16 069 G4 001

22 069G4002

28 069G4003

35 069G4004

© Danfoss | DCS (az) | 2018.11

DKRCC.PD.HF0.4B.02 | 2

Data sheet | Hot gas bypass regulator type CPCE, Liquid gas mixer type LG (accessory)

Selection

Example
When selecting the appropriate valve it may be
necessary to convert the actual capacity using a
correction factor. This is required when system
conditions are different from table conditions.

Step 1

Determine the replacement capacity. This is done
by taking the compressor capacity at minimum
suction temperature Q1 minus evaporator load at

Step 2

Determine the correction factor for the reduction
of suction temperature / suction pressure.

Suction temp. t

after reduction

[°C]

10

-10

-20

-30

-40 R22, R404A, R507, R407C 0 .1 0.3 0.6 1.0 1.5 2.0 2.2

s

0

Refrigerant

R134a 0.1 0.5

R22, R404A, R507, R407C 0.3 0.9 1.0 1.0 1.0 1.0 1.0

R134a 0.1 0.3

R22, R404A, R507, R407C 0.2

R134a 0.1 0.3 0.6 1.0 1.3 1.4 1.4

R22, R404A, R507, R407C 0.1 0.5

R134a 0.1 0.3 0.6

R22, R404A, R507, R407C 0.1 0.3 0.7 1.0 1.0 1. 0 1.0

R134a 0.1 0.3 0.6 1.0 1.5 2.2 2.9

R22, R404A, R507, R407C 0.1 0.3 0.6 1.0 1.3 1.4 1.4

The correction table is used when suction
temperature change deviates from 4 K.

The following examples illustrate how this is
done.

y Refrigerant: R404A
y Minimum suction temperature: t
y Compressor capacity at -30 °C, Q

= -30 °C

s

= 80 kW

1

y Evaporator load at -30 °C, Q2 = 60 kW
y Liquid temperature ahead of expansion valve:

t

= 40 °C

l

y Reduction of suction temperature/suction

pressure = 5 K
y Connection type: solder
y Connection size = 1/

in

2

minimum suction temperature Q2.
Q

- Q

=80-60=20 kW

1

2

From the correction factor table (see below)
a suction temperature reduction of 5 K (R404A)
corresponds to a factor of 1.3.

Suction temperature ∆t

1

2

3 4

0.9 1.0 1.0

0.7 1.0 1.0

0.9 1.0 1.0 1.0

1.0 1.0 1.0 1.0

[K]

1.0 1.5 2.2

s

5 6

1.0 1.0

1.0 1.0

1.0 1.0

The replacement capacity must be divided
by the correction factor determined.

7

1.0

2.4

© Danfoss | DCS (az) | 2018.11

Step 3

Corrected replacement capacity is
Q=20/1.3=15.4 kW

Step 4

Now select the appropriate capacity table for
R404A and choose the column with a suction
temperature of ts = -30 °C.

Step 5

CPCE 12, 1/2 in solder connection,
code no. 034N0082 (see Ordering).

Using the corrected replacement capacity, select
a valve that provides an equivalent or greater
capacity.
A CPCE 12 delivers a replacement capacity of

17.9 kW at a minimum suction temperature of

-30 °C.

DKRCC.PD.HF0.4B.02 | 3