HVAC / Refrigeration Components
Installation Guide for Danfoss CPCE Hot Gas Bypass Regulator
Installation and technical guide for the Danfoss CPCE hot gas bypass regulator. Includes specifications, refrigerant compatibility, installation torque requirements, and adjustment procedures.
Table of contents
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This document provides essential installation and technical data for the Danfoss CPCE hot gas bypass regulator and the LG liquid gas mixer accessory. Key requirements include adhering to specific tightening torques, especially when using flammable refrigerants, and following the correct brazing procedures.
Technical specifications
- Max Temperature: 140 °C (285 °F)
- Min Temperature: -50 °C (-60 °F)
- PS/MWP (Maximum Working Pressure): 28 bar pe (405 psig)
- Pmax Test Pressure: 31 bar pe (450 psig)
- Pressure Setting: 0.4 bar (6 psig)
- Adjustment: 360° rotation equals approximately 1 bar (15 psi)
Refrigerant compatibility
The CPCE regulator is compatible with the following refrigerants: R22, R1270, R134a, R290, R404A, R407A, R407C, R407F, R448A, R449A, R450A, R452A, R507A, R513A, R600, and R600a. For a complete list of approved refrigerants and individual code numbers, visit www.products.danfoss.com.
Installation and brazing
When installing the unit, ensure the correct wrench sizes are used: 14 mm (9/16 in.), 32 mm (1 1/4 in.), and 22 mm (7/8 in.). When brazing, use 15% Ag (silver) solder. Tightening torque must be strictly respected, particularly when the system is used with flammable refrigerants. The required torque is 4 Nm (finger tight + 1/4 turn).
Adjustment procedure
The regulator can be adjusted to control the bypass pressure. One full 360° turn of the adjustment screw corresponds to approximately 1 bar (15 psi) change in pressure setting.
Official resources from the manual
Manufacturer information
Danfoss A/S
Practical help
Common problems
Incorrect tightening torque
Ensure the unit is tightened to 4 Nm (finger tight + 1/4 turn), especially critical for flammable refrigerants.
Before use
- Verify that the refrigerant used is on the approved list (e.g., R22, R290, R600a).
- Ensure system pressure does not exceed the PS/MWP of 28 bar (405 psig).
- Check that the operating temperature is within the range of -50 °C to 140 °C.
- Prepare 15% Ag solder for installation.
Images and diagrams
- Wrench sizes required: 14mm, 32mm, and 22mm.
- Adjustment screw rotation: 360° equals 1 bar (15 psi) change.
Model compatibility
- Compatible with a wide range of refrigerants including R22, R134a, R290, R404A, R407C, R448A, R449A, R450A, R452A, R507A, R513A, R600, and R600a.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.