Danfoss B0 - B62 Data sheet

Data Sheet

Service kit
Type B0 - B62

Thermostat for refrigerators and freezers.

Electromechanical thermostat 077B is used to
control the temperature in refrigerators,
upright and chest freezers, liquid coolers, bottle
coolers and small commercial refrigeration
appliances. The thermostat can be used as an
evaporator thermostat or a room thermostat.

The thermostats are available with normal
function, xed cut-in and cut-out temperature,
constant or variable cut-in temperature for
automatic defrost, and with a push button for
semi-automatic defrost.

All thermostats have NC (Normally closed) main
contacts; i.e. they cut out the compressor
current circuit on decreasing temperature.

077B thermostats are available as a standard
thermostat range, as a service kit range and as
customer specied versions adapted to specic
appliances.

Service kit thermostats are created with
specications and accessories that allow
universal application in the aftermarket, for
thermostat servicing on all types of
refrigeration and freezing appliances.

Service kit thermostats have a wider regulating
range than standard thermostats, and have
dierentials that ensure sucient standstill to
protect the compressor. They enable servicing
on all refrigerating and freezing appliances
independent of the make of thermostats, and
are contained in practical boxes complete with
electrical diagram and drawings of contents.

AI357347699370en-000101

077B service kits

077B made to order

Warm cut-out [°C]

See Ordering for individual code no.

In range from ~-30 – 15 °C in steps of 0.1 °C

Warm cut-in [°C]

See Ordering for individual code no.

In range from ~-23 – 20 °C in steps of 0.1 °C

Cold cut-out [°C]

See Ordering for individual code no.

In range from ~-40 – 39 °C in steps of 0.1 °C

Cold cut-in [°C]

See Ordering for individual code no.

In range from ~-33 – 12 °C in steps of 0.1 °C

Capillary tube length

0.6 m

0.9 m

1.0 m

1.2 m

1.3 m

1.6 m

2.0 m

2.3 m

0.6 - 2.9 m

Connection terminals

4.8 x 0.8 mm All

6.3 – 4.8 x 0.8 Mix

6.3 x 0.8 mm All

4.8 x 0.8 mm All

6.3 – 4.8 x 0.8 Mix

6.3 x 0.8 mm All
Terminal 4 single

Barometric pressure setting

1013 hPa (760 mm Hg)

Altitude adjusted

Approvals

BEAB
UL
EAC

Accessories

Includes mounting accessories

Customer specied

Packing

Individually packed with instructions

Industrial packs

Service kit, type B0 - B62

Features

• Product identication data laser printed on product
⁃ Easy and lasting product identication.

• NC (Normally Closed) main contacts.
⁃ Cut-out of compressor on falling temperatures.

• Terminals with spade connectors 6.3 x 0.8 mm, 4.8 x 0.8 mm or combinations.
⁃ Fits into the majority of household and light commercial refrigerators and freezers.

• Electrical loads of 6/36 A or 8/40 A (FLA/LRA), designed for a minimum of 300.000 cycles at full load.
⁃ Reliable and lasting switching function.

• Service thermostat code no. delivered in Multipack
⁃ Service thermostats include relevant accessories and installation guides.

Portfolio

The complete 077B portfolio is very large, but the majority of 077B products are produced to order, as specied by
manufacturers of refrigeration appliances. This data sheet covers the aftermarket version of the 077B thermostats,
i.e. thermostats designed to replace made to order versions in an appliance service situation.

The primary dierences between made to order versions and service thermostats can be summarized as follows.

Table 1: 077B portfolio summary

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Cut-out

range

Differential

Warm

Middle Cold

Cut-in
range

Temperature
interval

°C

0

Temperature
interval

Cut-out
range

Warm Middle Cold

Danfoss

77B58.11

Service kit, type B0 - B62

Functions

Thermostat function

The thermostat regulates by cutting o or cutting in current to the compressor. Depending on the temperature
registered by the thermostat sensor, the thermostat controls the compressor by powering it (cut-in) or depowering
it (cut-o). The thermostat can be used either as an evaporator thermostat or a room thermostat.

All normal function thermostats have a cut-out temperature range and a cut-in temperature range. The dierential
is dened as the dierence between cut-in and cut-out temperatures. However, the temperature settings of xed
function thermostats are non-adjustable.

Figure 1: Cut-in, cut-out and dierential for normal
thermostats

On thermostats with constant cut-in temperature, B6 type, the terms “dierential” and “cut-in temperature range”
do not apply. The only relevant terms are “cut-out temperature range” and “temperature interval”.

Figure 2: Cut-out and temperature interval for
thermostats with constant cut-in temperature

Function and operation mode

The description covers the 077B types used as Service thermostats. Function and operation modes for the entire
portfolio are described in the data sheet "Thermostats for refrigerators and freezers, 077B"

© Danfoss | Climate Solutions | 2021.03 AI357347699370en-000101 | 3

Function

Operation mode

Type

Description

Danfoss

77B207.10

θ

Pos.

°C

Warm Middle Cold

Cut-in

Cut-out

Danfoss

90U22.12

3 4

B0

Without extra functionality

Danfoss

90U23.12

3 4

6

B02

With auxiliary contact

 NOTE:

Cant be used in combination with Low
torque cam.

Danfoss

90U24.12

4

6

3

B02

With auxiliary contact

Function

Operation mode

Type

Description

Danfoss

77B209.10

θ

Pos.

°C

Warm Middle Cold

Cut-in

Cut-out

Signal

Danfoss

90U42

B20

With signal contact that cuts in on rising
temperature

Danfoss

90U30.12

43

6

B3

With signal contact, cutting out on rising
temperature

Service kit, type B0 - B62

Table 2: Function and operation mode B0 and B02 versions

Table 3: Function and operation mode B20 and B3 versions

© Danfoss | Climate Solutions | 2021.03 AI357347699370en-000101 | 4