Teach you how to understand the data meaning of the high and low pressure meters in the chiller

Teach you how to understand the data meaning of the high and low pressure meters in the chiller The general high and low pressure meter of chiller refers to the refrigerant pressure of the refrigeration system, which is mainly used to monitor the operation of the system and facilitate after-sales maintenance. Different refrigerants have different pressures. Generally, the contrast pressures of several refrigerants will be marked on the high and low tables. Common ones are R22\R407 and R404, etc., high pressure 0-35/38MPa, low pressure -1-15/18MPa, some meters It says kgf/cm2, which is what we often call kilograms, 1 kg=0.1mpa.

　　 1. The refrigeration pressure gauge in the chiller is divided into "high pressure gauge" and "low pressure gauge". There is a pair for each HP (water-cooled chiller)

　　 1. The highest reading of "low pressure gauge" is generally 1.5MPa 1.8MPa

　　2, the highest reading of "high pressure meter" is generally 3.5MPa 3.8MPa

　 　　 2. Interpret the pressure value

　　 1. The value in the outermost circle of the low pressure meter is the value of MPa. If the pointer points to .3, the current pressure is 0.3 MPa. The value of the second circle of the low pressure meter from outside to inside is Kg/cm^2

　　2. The large black letters on the outermost circle of the high-pressure meter are the MPa value. If the pointer points to 2, the current pressure is 2.0MPa

　　3. Conversion of different pressure units 1MPa=10.2kg/cm^2=10bar=145Psi

　　 Three, interpret the temperature value

　　 1. Low and high pressure meter, counting from outside to inside (air-cooled chiller)

　　 3rd circle Green R134a temperature value, unit C (Celsius)

　　 the 4th circle black R22 temperature value, unit C (Celsius)

　　 Like a chiller using R22 as the refrigerant, when running, the low pressure of 0.4mPa corresponds to the condensation temperature of about 2 degrees

　　 Like a chiller using R134a as the refrigerant, when running, the low pressure of 0.2mPa corresponds to the condensation temperature of about 0.5 degrees

　　 2. High pressure meter, counting from outside to inside

　　 first circle black pressure value, unit MPa (megapascal)

　　 2nd circle Green R407C temperature value, unit C (Celsius)

　　 3rd circle Red R134a temperature value, unit C (Celsius)

　　 The 4th circle Green R22 temperature value, unit C (Celsius)

　　 fifth circle green R404A temperature value, unit C (degrees Celsius) (screw chiller)

　　 Like a chiller using R22 as the refrigerant, the high pressure 1.8mPa corresponds to a condensation temperature of about 50 degrees during operation

　　 Like a chiller using R22 as the refrigerant, the high pressure 1.8mPa corresponds to a condensation temperature of about 50 degrees during operation

　　 Additional explanation:

　　1, MPa MPa kg/cm^2 kgf/square centimeter

　　2. Different pressure gauges may have different pressure units. Before reading the pressure, look at the logo on the front dial

　　3. Chillers and air conditioners generally use R22 R407C R134a; low temperature units R22 R404A; household air conditioners R22 or R410A; car air conditioners R134 R12

　　4. When the compressor is not running, the pressure is the equilibrium pressure, that is, the high and low pressures are the same, and the pressure value corresponds to the ambient temperature or the water temperature of the water tank.

　　 Such as R22 when the ambient temperature is 30 degrees, the balance pressure of the pressure gauge is about 1.1MPa

　　 such as R22 when the ambient temperature is 10 degrees, the balance pressure of the pressure gauge is about 0.6MPa