Home Appliances / Refrigerators
Installation Guide for Danfoss Service Thermostats Type 077B7
Quick installation guide for Danfoss 077B7 series service thermostats. Includes technical specifications, capillary and sensor lengths, and safety notes for flammable refrigerants.
Table of contents
Manual images
Jump to the sectionImportant Information from the Manual
This document serves as an installation guide for the Danfoss 077B7 series of service thermostats. It provides technical specifications, including capillary and sensor lengths, and operating temperature profiles for various models. Users must verify the specific model number (e.g., 077B7099, 077B7100) to ensure correct application and installation.
Product Overview
The 077B7 series includes various thermostats designed for specific refrigeration applications, such as ice-cream cabinets, freezers, commercial refrigerators, and bottle coolers. Each model has unique cut-in and cut-out temperature characteristics, which are detailed in the provided graphs.
Technical Specifications
Each thermostat model requires specific installation parameters regarding the capillary and sensor:
- L (Capillary Length): Varies by model (e.g., 900 mm to 1300 mm).
- LS (Minimum Sensor Length): The minimum length of the sensor that must be mounted on the evaporator (e.g., 85 mm to 110 mm).
- Airsensor usage: For models using an airsensor, the minimum length is 2 x LS.
Installation and Accessories
The manual provides exploded-view diagrams for the assembly of the thermostats. These diagrams illustrate the correct positioning of the control knob, mounting plate, and electrical terminal connections. Ensure all components are assembled according to the specific diagram corresponding to your model number.
Safety and Operating Conditions
Flammable Refrigerants: Models with the EBD suffix (e.g., 077B….EBD) are suitable for use with R290 and R600a working fluids. In countries where safety standards are not mandatory, Danfoss recommends obtaining third-party approval for systems containing flammable refrigerants.
Operating Pressure: All temperature specifications are based on a pressure of 760 mm Hg, with the exception of model 077B7242, which is specified at 700 mm Hg.
Manufacturer information
Danfoss A/S
Practical help
Common problems
Incorrect temperature regulation
Verify that the capillary length (L) and sensor length (LS) match the specific requirements for your thermostat model.
Safety compliance with flammable refrigerants
If using R290 or R600a, ensure the system has third-party approval in regions where safety standards are not an indispensable part of the safety system.
Before use
- Identify the exact model number (e.g., 077B7099) from the device label.
- Check the required capillary length (L) for your specific model.
- Ensure the sensor length (LS) is correctly mounted on the evaporator.
- Confirm the operating pressure conditions (standard 760 mm Hg, or 700 mm Hg for 077B7242).
- Verify if the model is compatible with R290/R600a if applicable.
Specs in practice
- Cut-in/Cut-out
- Temperature points where the thermostat activates or deactivates the cooling system.
Images and diagrams
- Exploded views show the assembly of the thermostat knob, mounting plate, and electrical connections.
Model compatibility
- Compatible with various refrigeration systems including ice-cream cabinets, freezers, and commercial refrigerators.
- Specific models (EBD suffix) are suitable for R290 and R600a refrigerants.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.