17
Tranquility
®
D i g i t a l ( D X M 2 ) — Tr o u b l e s h o o t i n g G u i d e
R e v. : 1 0 M a r c h , 2 0 1 5
w w w. c l i m a t e m a s t e r. c o m
Reversing Valve Touch Test Chart
A-E
4
2
3
1
6
5
Line to
Air Coil
Discharge from
Compressor
Line to
Coax
Suction Line
to Compressor
VALVE
OPERATING
CONDITION
NOTES: * Temperature of Valve Body
** Warmer than Valve Body
1
2
3
4
5
6
NORMAL OPERATION OF VALVE
Normal
COOLING
Hot
Cool
Cool
23 (2)
Hot
23 (7)
TVB
*TVB
Normal
HEATING
Hot
Cool
Hot
23 (1)
Cool
23 (2)
TVB
*TVB
MALFUNCTION OF VALVE
Possible causes
Corrections
Valve will not
shift from heat
to cool
Check electrical circuit and coil
No Voltage to coil
Repair electrical circuit
Defective coil (No resistance)
Replace coil
Check refrigeration charge
Low charge
Repair leak, recharge system
Pressure differential too high
Recheck system
Hot
Cool
Hot
23 (1)
Cool
23 (2)
Hot
*TVB
Pilot valve okay. Dirt in one bleeder hose.
Deenergize solenoid, raise head pressure and reenergize
solenoid to break dirt loose. If unsuccessful, remove
valve and clean out. Check on air before installing if not
movement, reduce valve, add strainer to decharge tube and
mount valve horizontally
Platon cup leak
Stop unit. After pressure equalizes, restart with solenoid
energized. If valve shifts, restart with compressor running. If
still no shift, replace valve.
Hot
Cool
Hot
23 (1)
Cool
23 (2)
Hot
*TVB
Clogged pipe tubes.
Raise head pressure, operate solenoid to free. If still no shift,
replace valve
Hot
Cool
Hot
23 (1)
Cool
23 (2)
Hot
Hot
Both parts of pilot open. (Back seat port did not
close)
Raise head pressure, operate solenoid to free partially
clogged port. If still no shift, replace valve.
Warm
Cool
Warm
23 (1)
Cool
23 (2)
Warm
TVB
Defective compressor
Start to shift
but does not
complete
reversal
Hot
Warm
Warm
Hot
*TVB
Hot
Not enough pressure differential at start of
stroke or not enough flow to maintain pressure
differential.
Check unit for correct operating pressures and charge.
Raise head pressure. If no shift, use valve with smaller ports.
Body damage.
Replace valves.
Hot
Warm
Warm
Hot
Hot
Hot
Both parts of pilot open.
Raise head pressure, operate solenoid. If no shift, replace
valve.
Hot
Hot
Hot
Hot
*TVB
Hot
Body damage.
Replace valve.
Valve hung up at mid-stroke. Pumping volume of
compressor not sufficient to maintain reversal.
Raise head pressure, operate solenoid. If no shift, use valve
with smaller ports.
Hot
Hot
Hot
Hot
Hot
Hot
Both parts of pilot open.
Raise head pressure. Operate solenoid. If no shift, replace
valve.
Apparent lock
in cooling
Hot
Cool
Cool
23 (2)
Hot
23 (1)
**WVB
*TVB
Pilot needle on end of side leaking.
Operate valve several times then recheck. If excessive leak,
replace valve.
Hot
Cool
Cool
23 (2)
Hot
23 (1)
**WVB
**WVB
Pilot needle and piston needle leaking
Operate valve several times then recheck. If excessive leak,
replace valve.
Will not shift
cool to heat
Hot
Cool
Cool
23 (2)
Hot
23 (1)
TVB
TVB
Pressure differential too high
Stop unit. Will reverse during equalization period. Recheck
system.
Clogged pilot tube
Raise head pressure. Operate solenoid to free dirt. If still no
shift, replace valve.
Hot
Cool
Cool
23 (2)
Hot
23 (1)
TVB
Hot
Dirt in bleeder hole
Raise head pressure. Operate solenoid. Replace valve.
Piston cup leak
Stop unit. After pressures equalize, restart with solenoid
deenergized. If valve shifts, reattempt with compressor
running. If it still will not reverse while running, replace valve.
Hot
Cool
Cool
23 (2)
Hot
25 (1)
Hot
Hot
Defective pilot.
Replace valve.
Warm
Cool
Cool
23 (2)
Warm
25 (1)
*TVB
Warm
Defective compressor.
