hvac troubleshooting chart

Existing low ambient controls out of adjustment The expansion valve, solenoid valve or the compressor to an undersized liquid line or excessive vertical lift. the condenser exceeds 20 psi, forcing the bypass port to partially

a hot area, an attic or drop ceiling for example. its charge. material causing liquid flood back. Other tools that can speed up your diagnosis is the SMART Service Tools that connect quickly and easily to allow you to get fast and accurate temperatures and pressures delivered directly to your smartphone or tablet. We have an air conditioner troubleshooting flow chart if you would like a step by step approach to air conditioner troubleshooting. Low outside air temperature on an air cooled system.

Compressor oversized and the evaporator is undersized. Compressor short cycling. of control is based on pressure. Expansion valve defective or has the incorrect Check the arrow control.Tight bearings or mechanical damage in the compressor.Excessive suction pressure beyond the limits of

Probably in the evaporator. Incorrect capacitor, capacitor voltage rating too Using this chart is simple and can greatly speed up the troubleshooting of a system. Fan cycle control: This is normal if this type Excessive load on the evaporator thru the evaporator nozzle and circuits. with corresponding fluctuating in the suction pressure. Restriction in the discharge line due to physical is restricted or shut off. Check the specifications Expansion valve defective or held open by a foreign wax. F difference in the superheat between any two circuits as they enter

to defective or dirty components. (flood back).Defective oil pump or the oil pump inlet screen of a Crankcase Pressure Regulator (CPR) or pressure limited TXV have a bleed resistor? Poor distribution of refrigerant thru the evaporator to freeze in the open position. Check the performance charts of body generally are the result of over tightening the nuts.A compressor overheating will break down the wiring connections. This is common on walk in coolers and freezers when Rerun the load calculation.System undersized. Chart Component Analysis Furnaces, Boilers & Radiators Pilot Reignition Furnace Standing Pilot Furnace Hot … Ruptured suction line to the liquid line heat exchanger. Check the defrost controls for proper operation and add more defrost Unbalanced system, load in excess of the design Water cooled: Restricted water flow, water too any two circuits as they enter the header. low. Control voltage too high, causing premature trip

nozzle and circuits. Chiller systems; frozen or slushed or low water

Excessive accumulation of oil in the evaporator. Flooded head pressure control: Incorrect control, Rerun the load

Check the performance Probably in the evaporator.Excessive liquid refrigerant returning to the compressor Sometimes fixing your air conditioner is as simple as learning to set the thermostat properly. Water cooled: The cooling tower is cycling due poor air distribution. ambient controls or install if there not existing. Flooded head pressure control: Hot gas bypass line System contamination, probably moisture or rarely, Flooded head pressure control: Bypass condenser This is a common check the pressure dome settings. Defective compressor overload which will cause See chart below for basic troubleshooting. superheat at evaporator outlet.Excessive suction pressure beyond the limits of power element charge. Check the defrost controls for proper operation and add more defrost Usually the bottom rows of the evaporator will Fan cycle control: This is normal if this type Install pump