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, fixed 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 specified versions adapted to specific appliances.

Service kit thermostats are created with specifications 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 differentials that ensure sufficient 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

Service kit, type B0 - B62

Features

•Product identification data laser printed on product

Easy and lasting product identification.

•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 specified 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 differences between made to order versions and service thermostats can be summarized as follows.

Table 1: 077B portfolio summary

	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	0.6 - 2.9 m
	0.9 m
	1.0 m
	1.2 m
	1.3 m
	1.6 m
	2.0 m
	2.3 m
Connection terminals	4.8 x 0.8 mm All	4.8 x 0.8 mm All
	6.3 – 4.8 x 0.8 Mix	6.3 – 4.8 x 0.8 Mix
	6.3 x 0.8 mm All	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 specified
Packing	Individually packed with instructions	Industrial packs

© Danfoss | Climate Solutions | 2021.03

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Service kit, type B0 - B62

Functions

Thermostat function

The thermostat regulates by cutting off 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-off). 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 differential is defined as the difference between cut-in and cut-out temperatures. However, the temperature settings of fixed function thermostats are non-adjustable.

Figure 1: Cut-in, cut-out and differential for normal thermostats

		Cut-in
		range
Cut-out	Differential	Temperature
		interval
range
Warm	Middle	Cold

On thermostats with constant cut-in temperature, B6 type, the terms “differential” 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

°C
0		<![if ! IE]> <![endif]>Danfoss	<![if ! IE]> <![endif]>77B58.11
		Tempe rature
Cut-out		interval
range
Warm	Middle	Cold

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

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Service kit, type B0 - B62

Table 2: Function and operation mode B0 and B02 versions

		Function	Operation mode
°C
		in	<![if ! IE]> <![endif]>Danfoss 77B207.10	<![if ! IE]> <![endif]>Danfoss 90U22.12
		Cut-
		Cut-
		out
			3	4
θ			Pos.
	Warm	Middle	Cold
				<![if ! IE]> <![endif]>Danfoss 90U23.12

3 4

6

<![if ! IE]>

<![endif]>Danfoss 90U24.12

3 4 6

Type Description

B0	Without extra functionality

	With auxiliary contact
B02	NOTE:
	Cant be used in combination with Low
	torque cam.

B02	With auxiliary contact

Table 3: Function and operation mode B20 and B3 versions

Function	Operation mode	Type	Description

°C				<![if ! IE]> <![endif]>Danfoss 90U42
			<![if ! IE]> <![endif]>Danfoss 77B209.10
		Signal
		Cut-in
		Cut-out		B20	With signal contact that cuts in on rising
					temperature
θ	Warm	Middle	Cold	Pos.
				<![if ! IE]> <![endif]>Danfoss 90U30.12
				B3	With signal contact, cutting out on rising
					temperature

34

6

© Danfoss | Climate Solutions | 2021.03

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