Normal Function of Valve, Malfunction of Valve

TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES

NORMAL FUNCTION OF VALVE

VALVE	DISCHARGETUBE	Compressorfrom	TUBESUCTION Compressorto	INSIDEtoTube COIL	OUTSIDEtoTube COIL	PilotLEFT TubeCapillary	PilotRIGHT TubeCapillary	NOTES:
	DISCHARGETUBE	Compressorfrom	TUBESUCTION Compressorto	INSIDEtoTube COIL	OUTSIDEtoTube COIL	PilotLEFT TubeCapillary	PilotRIGHT TubeCapillary	** WARMER THAN VALVE BODY

OPERATING								* TEMPERATURE OF VALVE BODY
CONDITION								* TEMPERATURE OF VALVE BODY
CONDITION

	1	2	3	4	5	6	POSSIBLE CAUSES	CORRECTIONS
Normal Cooling	Hot	Cool	Cool	Hot	*TVB	TVB
Normal Cooling	Hot	Cool	as (2)	as (1)	*TVB	TVB
			as (2)	as (1)
Normal Heating	Hot	Cool	Hot	Cool	*TVB	TVB
Normal Heating	Hot	Cool	as (1)	as (2)	*TVB	TVB
			as (1)	as (2)
					MALFUNCTION OF VALVE
	Check Electrical circuit and coil						No voltage to coil.	Repair electrical circuit.

							Defective coil.	Replace coil.
							Defective coil.	Replace coil.
	Check refrigeration charge						Low charge.	Repair leak, recharge system.

							Pressure differential too high.	Recheck system.
							Pressure differential too high.	Recheck system.
Valve will not
Valve will not								Deenergize solenoid, raise head pressure,
shift from cool								reenergize solenoid to break dirt loose.
shift from cool	Hot	Cool	Cool,	Hot,	*TVB	Hot	Pilot valve okay. Dirt in one bleeder hole.	If unsuccessful, remove valve, wash
to heat.	Hot	Cool	as (2)	as (1)	*TVB	Hot	Pilot valve okay. Dirt in one bleeder hole.	out. Check on air before installing. If no
								movement, replace valve, add strainer to
								discharge tube, mount valve horizontally.
								Stop unit. After pressures equalize, restart
							Piston cup leak	with solenoid energized. If valve shifts,
							Piston cup leak	reattempt with compressor running. If still
								reattempt with compressor running. If still
								no shift, replace valve.

	Hot	Cool	Cool,	Hot,	*TVB	*TVB	Clogged pilot tubes.	Raise head pressure, operate solenoid to
	Hot	Cool	as (2)	as (1)	*TVB	*TVB	Clogged pilot tubes.	free. If still no shift, replace valve.
			as (2)	as (1)				free. If still no shift, replace valve.
Valve will not								Raise head pressure, operate solenoid
Valve will not			Cool,	Hot,			Both ports of pilot open. (Back seat port	to free
shift from cool	Hot	Cool	Cool,	Hot,	Hot	Hot	Both ports of pilot open. (Back seat port	partially clogged port. If still no shift,
shift from cool	Hot	Cool	as (2)	as (1)	Hot	Hot	did not close).	partially clogged port. If still no shift,
to heat.								replace
to heat.								valve.
								valve.
	Warm	Cool	Cool,	Hot,	*TVB	Warm	Defective Compressor.	Replace compressor
	Warm	Cool	as (2)	as (1)	*TVB	Warm	Defective Compressor.	Replace compressor
			as (2)	as (1)
							Not enough pressure differential at start	Check unit for correct operating pressures
	Hot	Warm	Warm	Hot	*TVB	Hot	of stroke or not enough ﬂ ow to maintain	and charge. Raise head pressure. If no
							pressure differential.	shift, use valve with smaller port.
							Body damage.	Replace valve
Starts to shift
Starts to shift	Hot	Warm	Warm	Hot	Hot	Hot	Both ports of pilot open.	Raise head pressure, operate solenoid. If
but does not	Hot	Warm	Warm	Hot	Hot	Hot	Both ports of pilot open.	no shift, use valve with smaller ports.
but does not								no shift, use valve with smaller ports.
complete	Hot	Hot	Hot	Hot	*TVB	Hot	Body damage.	Replace valve
reversal.							Valve hung up at mid-stroke. Pumping	Raise head pressure, operate solenoid. If
							volume of compressor not sufﬁ cient to	no shift, use valve with smaller ports.
							maintain reversal.	no shift, use valve with smaller ports.
							maintain reversal.
								Raise head pressure, operate solenoid.
	Hot	Hot	Hot	Hot	Hot	Hot	Both ports of pilot open.	If no
								shift, replace valve.
Apparent	Hot	Cool	Hot,	Cool,	*TVB	*TVB	Piston needle on end of slide leaking.	Operate valve several times, then recheck.
Apparent	Hot	Cool	as (1)	as (2)	*TVB	*TVB	Piston needle on end of slide leaking.	If excessive leak, replace valve.
leap in heat-			as (1)	as (2)				If excessive leak, replace valve.
leap in heat-			Hot,	Cool,				Operate valve several times, then recheck.
ing.	Hot	Cool	Hot,	Cool,	**WVB	**WVB	Pilot needle and piston needle leaking.	Operate valve several times, then recheck.
ing.	Hot	Cool	as (1)	as (2)	**WVB	**WVB	Pilot needle and piston needle leaking.	If excessive leak, replace valve.

	Hot	Cool	Hot,	Cool,	*TVB	*TVB	Pressure differential too high.	Stop unit. Will reverse during equalization
	Hot	Cool	as (1)	as (2)	*TVB	*TVB	Pressure differential too high.	period. Recheck system
			as (1)	as (2)				period. Recheck system
							Clogged pilot tube.	Raise head pressure, operate solenoid to
							Clogged pilot tube.	free dirt. If still no shift, replace valve.
								free dirt. If still no shift, replace valve.
								Raise head pressure, operate solenoid.
			Hot,	Cool,				Remove valve and wash out. Check on air
	Hot	Cool	Hot,	Cool,	Hot	*TVB	Dirt in bleeder hole.	before reinstalling, if no movement, replace
	Hot	Cool	as (1)	as (2)	Hot	*TVB	Dirt in bleeder hole.	before reinstalling, if no movement, replace
Will not shift			as (1)	as (2)				valve. Add strainer to discharge tube.
								valve. Add strainer to discharge tube.
								Mount valve horizontally.
from heat to								Mount valve horizontally.
from heat to								Stop unit. After pressures equalize, restart
cool.								Stop unit. After pressures equalize, restart
cool.			Hot,	Cool,				with solenoid deenergized. If valve shifts,
	Hot	Cool	Hot,	Cool,	Hot	*TVB	Piston cup leak.	reattempt with compressor running. If it
	Hot	Cool	as (1)	as (2)	Hot	*TVB	Piston cup leak.	reattempt with compressor running. If it
			as (1)	as (2)				still will not reverse while running, replace
								still will not reverse while running, replace
								the valve.
	Hot	Cool	Hot,	Cool,	Hot	Hot	Defective pilot.	Replace valve.
	Hot	Cool	as (1)	as (2)	Hot	Hot	Defective pilot.	Replace valve.
			as (1)	as (2)
	Warm	Cool	Warm,	Cool,	Warm	*TVB	Defective compressor.	Replace compressor
	Warm	Cool	as (1)	as (2)	Warm	*TVB	Defective compressor.	Replace compressor
			as (1)	as (2)

2009, 2008 specifications

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NORMAL FUNCTION OF VALVE

VALVE

DISCHARGETUBE

POSSIBLE CAUSES

CORRECTIONS

MALFUNCTION OF VALVE

Valve will not

shift from cool

to heat.

out. Check on air before installing. If no

Defective Compressor.

Replace compressor

reversal.

Apparent

ing.

Will not shift

cool.

2009, 2008 specifications