A/c Manfold Gauge Low Side Reads High and High Side Reads High
Using Gauges for Troubleshooting
Judge pressure is the first tool in Air-conditioning troubleshooting. The table below shows 7 Gauge Readouts that you may come across. Utilize the Approximate Readout Tool separately or in combination with the table of Gauge Diagnostics for Ac troubleshooting.
Guess Readout Tool
Normal Conditions
Air in cooling system (bereft suction)
Defective expansion valve
Excessive refrigerant
Moisture Intrusion
Refrigerant does not broadcast
Summary Table of Gauge Diagnostics
Normal Conditions
1 Atmosphere
Room Temperatures of thirty-38 C (86 - 96 F)
Engine speed of approx. 1500 rpm or nigh 75% of rated engine speed
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Air in cooling system (insufficient suction)
Pressure level Range
Low side: 36 to 50 psi
High side: 284 to 356 psi
Indications
Both pressures are As well HIGH
The depression-side piping is not common cold
Causes
Air in the system
Remedy
Evacuate the organisation
Replenish the refrigerant
Check the guess readings
If prolonged performance with air in the system, the liquid tank must be replaced.
Back to Meridian
Defective expansion valve
Pressure Range
Low side: 30 to 36 psi
High side: 313 to 327 psi
Indications
Both pressures are Too Loftier
Causes
Improper refrigerant accuse
Lacking expansion valve
Improper temperature sensor installation
Remedy
Verify refrigerant charge
Bank check temperature sensor installation and insulation
If the refrigerant charge is okay and the temperature sensor installation and insulation are right and then supersede the expansion valve.
Back to Elevation
Excessive refrigerant
Pressure Range
Low side: 36 to 43 psi
Loftier side: 327+ psi
Indications
Both pressures are TOO HIGH
Causes
Force per unit area increase due to excessive refrigerant
Insufficient condenser cooling
Remedy
Verify the refrigerant level
Clean the condenser
Check and adjust the fan belt and / or the condenser fan motors
Dorsum to Peak
Moisture Intrusion
Pressure Range
Low side: 18 to 28 psi
Loftier side: 85 to 256 psi
Indications
Low pressure level side alternates betwixt a vacuum and normal pressure
Causes
Moisture has frozen in the air conditioner organization, bottleneck the expansion valve.
Remedy
Evacuate the system
Replace the receiver dryer
Recharge the system
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Refrigerant does not broadcast
Pressure Range
Low side: 0 to -29.99 psi
High side: 71 to 85 psi
Indications
Depression pressure level side becomes a vacuum
Loftier pressure as listed above
Frost or condensation on the front and rear piping connections of the receiver dryer or expansion valve
Causes
Air-conditioning system is blocked past contamination or ice
AC system is shut off by lacking expansion valve or tempeerature sensor
Air-conditioning line from evaporator to compressor has kink in the line
Remedy
STOP Performance IMMEDIATELY
Cheque for contamination or ice
If moisture is found then evacuate the system
If the expansion valve is lacking then replace it
Supplant receiver dryer
Recharge with refrigerant to proper level
Repair whatsoever kinked hoses
Dorsum to Top
Summary Table of Guess Diagnostics
Low Force per unit area Side is TOO HIGH
The depression pressure side normally becomes besides high when the high pressure level side is too high.
| Cause | Inspection | Remedy |
|---|---|---|
| Defective Thermoswitch | The magnetic clutch switch turns off earlier the outlet air temperature is sufficiently depression. | Supervene upon the thermoswitch |
| Poor Expansion Valve temperature sensor contact | The high and depression pressure sides estimate pressures equalize when the magnetic clutch is turned off (within a brusque fourth dimension duration) | Replace Compressor |
| Expansion Valve opens too far | Frost has adhered to the suction hose / pipe | Install the temperature sensor against the low pressure pipe and cover with insulating tape. |
| Chock-full compressor suction filter | Compressor plumbing equipment is cool merely the depression pressure hose is not. | Remove and make clean the filter. |
Low Force per unit area Side is TOO Depression
| Cause | Inspection | Remedy |
|---|---|---|
| Insufficient Refrigerant | In that location is fiddling temperature difference between the low and high pressure sides. | Repair any leaks and recharge the refrigerant to the right levels. |
| Clogged liquid tank (receiver dryer, accumulator) | Considerable temperature difference between the inlet and outlet sides of the receiver dryer during performance. Too, tank may be frosted | Replace liquid tank (receiver dryer) |
| Clogged expansion valve | Expansion valve inlet side is frosted. By and large the low side pressure level is near vacuum. | Supercede expansion valve. |
| Expansion valve temperature sensor gas leak (damaged capillary tube, etc..) | Expansion valve outlet side is chilled and low pressure side is LOW. | Clean or replace expansion valve. |
| Clogged or blocked piping | Depression pressure readings decrease or a negative reading is shown. Indicates piping is clogged or blocked between the evaporator coil and the compressor. A frost spot may indicate the point of blockage. | Make clean or supersede piping. |
| Lacking thermoswitch (common cold control) | Evaporator is frozen showing ice along the face of the ringlet, not but frost on the manifolds of the coil. | Adjust temperature sensing tube to a cooler role of the coil or replace the thermoswitch. |
Loftier Pressure level Side is TOO Loftier
| Cause | Inspection | Remedy |
|---|---|---|
| Poor Condenser cooling | Dirty or clogged condenser fins, Cooling fans practice not operate correctly. | Make clean and / or repair the condenser cadre / fans. |
| Excessive refrigerant | Verify by gauge reading | Apply your refrigerant recovery equipment to capture backlog refrigerant. Accuse to the correct refrigerant levels. |
| Air in the system | Pressure is loftier on both high and low sides | Evacuate, vacuum and recharge with refrigerant. |
Loftier Force per unit area Side is Likewise Low
| Crusade | Inspection | Remedy |
|---|---|---|
| Insufficient refrigerant | Fiddling temperature difference between the low and high pressures. | Repair any leaks and recharge the refrigerant to the correct levels |
Source: https://www.perrinmfg.com/resources/gauge-diagnostics
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