PRODUCT DESCRIPTION

Shangheng STF YK Series mechanical pressure controls are manufactured by Shanghai Thermostat Factory Co., Ltd. for pressure control and pressure protection in refrigeration, air-conditioning, heat-pump and chiller systems.

When the system pressure reaches the selected set point, the internal electrical switch changes state to control or protect the compressor and other refrigeration equipment.

The range includes YK306 dual-pressure controls for combined high- and low-pressure monitoring, together with YK30 single-pressure controls. Automatic-reset and manual-reset configurations are available depending on the complete model suffix.

KEY FEATURES

• Mechanical refrigeration pressure control
• Single- and dual-pressure configurations
• Adjustable pressure range and differential
• Automatic- and manual-reset versions available
• Suitable for compressor operating control and pressure protection
• Suitable for HFC and HCFC refrigerants, compressed air, water and oil
• Visible adjustment scale
• Compact enclosure with mounting bracket
• Maximum published voltage: 250 V AC
• Maximum published switching current: 21 A

AVAILABLE MODELS

Option Name: Model

• YK306FSE
• YK306FSSE
• YK306FE
• YK30FE

YK306 SERIES REFERENCE DATA

Control Type: Dual high- and low-pressure control

Low-Pressure Side:

• Pressure setting range: −0.065 to 0.6 MPa
• Adjustable differential: 0.06–0.4 MPa
• Reset type: Automatic
• Published setting point: 0.2–0.3 MPa

High-Pressure Side:

• Pressure setting range: 0.8–3.0 MPa
• Differential: 0.4 MPa, fixed
• Published setting point: 1.6–2.0 MPa
• Manual-reset configuration available depending on model

YK30 SERIES REFERENCE DATA

Control Type: Single-pressure control

• Pressure setting range: 0.5–3.0 MPa
• Adjustable differential: 0.2–0.7 MPa
• Published setting point: 2.0–2.5 MPa
• Reset configuration: Confirm according to the complete model suffix

GENERAL TECHNICAL DATA

• Product type: Mechanical pressure control
• Suitable media: HFC and HCFC refrigerants, compressed air, water and oil
• Standard published connection: M12 × 1.25
• Medium temperature: −20°C to +120°C
• Ambient temperature: −20°C to +70°C
• Supply voltage: 125 V AC / 250 V AC
• Non-inductive current: 15 A / 15 A
• Inductive continuous current: 3.5 A / 2.5 A
• Inductive transient current: 21 A / 15 A

The specifications printed on the supplied product nameplate take precedence over general series data.

APPLICATIONS

• Cold-room refrigeration systems
• Condensing units
• Water chillers
• Heat pumps
• Commercial air-conditioning systems
• Compressor high-pressure protection
• Compressor low-pressure protection
• Refrigeration operating control

ORDERING INFORMATION

Please confirm the following before ordering:

• Complete model number
• Required pressure range
• Single- or dual-pressure control
• Automatic- or manual-reset configuration
• Pressure connection type
• Electrical rating
• Controlled medium or refrigerant

Different suffixes may indicate different reset arrangements, pressure connections or electrical configurations.