Checking of Refrigeration System with Manifold Gauge

This is a method in which the trouble is located by using a manifold gauge. Read the manifold gauge pressure when the following conditions are established:

(a) Temperature at the air inlet is 30 - 35°C (86 - 95°F)

(b) Engine running at 1,500 rpm

(c) . Blower fan speed switch set at high speed

(d) Temperature control lever set at cool side

NOTE: It should be noted that the gauge indications may vary slightly due to ambient temperature conditions.

NORMALLY FUNCTIONING REFRIGERATION SYSTEM

Gauge reading:

Low pressure side 1.5 - 2.0 kg/cm2 (21 - 28 psi 147 - 196 kPa)

High pressure side 14.5 - 15.0 kg/cm2 (206 - 213 psi 1,422 - 1,471 kPa)

Each pointer of manifold gauge point to position A

Refrigeration Gauges How Read

No.

Trouble

Condition

Position of Pointers

1

Moisture present in refrigeration system

Periodically cools and then fails to cool

Between A and B

2

Insufficient refrigerant

Insufficient cooling

C

3

Poor circulation of refrigerant

Insufficient cooling

C

4

Refrigerant overcharge or insufficient cooling of condenser

Does not cool sufficiently

D

5

Expansion valve improperly mounted, heat sensing tube defective (Opens too wide)

Insufficient cooling

D

6

Air present in refrigeration system

Does not cool sufficiently

Low is D High is D'

7

Refrigerant does not circulate

Does not cool (Cools from time to time in some cases)

E

8

Insufficient compression

Does not cool

F

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Responses

  • EDWARD
    Where is refrigerant system in 2001 mr2?
    7 years ago

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