Friedrich CP05 사용자 설명서
15
NORMAL FUNCTION OF VALVE
VALVE
OPERATING
CONDITION
DIS
C
H
A
R
G
E
TU
BE
fr
o
m
Co
m
p
re
sso
r
SU
C
T
IO
N
TU
B
E
t
o
Co
m
p
re
s
s
o
r
Tu
b
e
t
o
I
N
S
ID
E
COI
L
Tu
b
e
t
o
O
U
T
S
ID
E
COI
L
LE
F
T
P
ilo
t
Ca
p
ill
a
ry
T
u
be
RIG
H
T
P
ilo
t
Ca
p
ill
a
ry
T
u
be
NOTES:
* TEMPERATURE OF VALVE BODY
** WARMER THAN VALVE BODY
1
2
3
4
5
6
POSSIBLE CAUSES
CORRECTIONS
Normal Cooling
Hot
Cool
Cool
as (2)
Hot
as (1)
*TVB
TVB
Normal Heating
Hot
Cool
Hot
as (1)
Cool
as (2)
*TVB
TVB
MALFUNCTION OF VALVE
Valve will not
shift from cool
to heat.
shift from cool
to heat.
Check Electrical circuit and coil
No voltage to coil.
Repair electrical circuit.
Defective coil.
Replace coil.
Check refrigeration charge
Low charge.
Repair leak, recharge system.
Pressure differential too high.
Recheck system.
Hot
Cool
Cool,
as (2)
Hot,
as (1)
*TVB
Hot
Pilot valve okay. Dirt in one bleeder hole.
De-energize solenoid, raise head pres-
sure, reenergize solenoid to break dirt
loose. If unsuccessful, remove valve, wash
out. Check on air before installing. If no
movement, replace valve, add strainer to
discharge tube, mount valve horizontally.
sure, reenergize solenoid to break dirt
loose. If unsuccessful, remove valve, wash
out. Check on air before installing. If no
movement, replace valve, add strainer to
discharge tube, mount valve horizontally.
Piston cup leak
Stop unit. After pressures equalize, restart
with solenoid energized. If valve shifts,
reattempt with compressor running. If still
no shift, replace valve.
with solenoid energized. If valve shifts,
reattempt with compressor running. If still
no shift, replace valve.
Valve will not
shift from cool
to heat.
shift from cool
to heat.
Hot
Cool
Cool,
as (2)
Hot,
as (1)
*TVB
*TVB
Clogged pilot tubes.
Raise head pressure, operate solenoid to
free. If still no shift, replace valve.
free. If still no shift, replace valve.
Hot
Cool
Cool,
as (2)
Hot,
as (1)
Hot
Hot
Both ports of pilot open. (Back seat port did
not close).
not close).
Raise head pressure, operate solenoid to
free partially clogged port. If still no shift,
replace valve.
free partially clogged port. If still no shift,
replace valve.
Warm
Cool
Cool,
as (2)
Hot,
as (1)
*TVB
Warm
Defective Compressor.
Replace compressor
Starts to shift
but does not
complete
reversal.
but does not
complete
reversal.
Hot
Warm
Warm
Hot
*TVB
Hot
Not enough pressure differential at start of
stroke or not enough fl ow to maintain pres-
sure differential.
stroke or not enough fl ow to maintain pres-
sure differential.
Check unit for correct operating pressures
and charge. Raise head pressure. If no
shift, use valve with smaller port.
and charge. Raise head pressure. If no
shift, use valve with smaller port.
Body damage.
Replace valve
Hot
Warm
Warm
Hot
Hot
Hot
Both ports of pilot open.
Raise head pressure, operate solenoid.
If no shift, use valve with smaller ports.
If no shift, use valve with smaller ports.
Hot
Hot
Hot
Hot
*TVB
Hot
Body damage.
Replace valve
Valve hung up at mid-stroke. Pumping vol-
ume of compressor not suffi cient to maintain
reversal.
ume of compressor not suffi cient to maintain
reversal.
Raise head pressure, operate solenoid.
If no shift, use valve with smaller ports.
If no shift, use valve with smaller ports.
Hot
Hot
Hot
Hot
Hot
Hot
Both ports of pilot open.
Raise head pressure, operate solenoid.
If no shift, replace valve.
If no shift, replace valve.
Apparent
leap in heating.
leap in heating.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
*TVB
*TVB
Piston needle on end of slide leaking.
Operate valve several times, then recheck.
If excessive leak, replace valve.
If excessive leak, replace valve.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
** WVB
** WVB
Pilot needle and piston needle leaking.
Operate valve several times, then recheck.
If excessive leak, replace valve.
If excessive leak, replace valve.
Will not shift
from heat to
cool.
from heat to
cool.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
*TVB
*TVB
Pressure differential too high.
Stop unit. Will reverse during equalization
period. Recheck system
period. Recheck system
Clogged pilot tube.
Raise head pressure, operate solenoid to
free dirt. If still no shift, replace valve.
free dirt. If still no shift, replace valve.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
Hot
*TVB
Dirt in bleeder hole.
Raise head pressure, operate solenoid.
Remove valve and wash out. Check on
air before reinstalling, if no movement,
replace valve. Add strainer to discharge
tube. Mount valve horizontally.
Remove valve and wash out. Check on
air before reinstalling, if no movement,
replace valve. Add strainer to discharge
tube. Mount valve horizontally.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
Hot
*TVB
Piston cup leak.
Stop unit. After pressures equalize, restart
with solenoid de-energized. If valve shifts,
reattempt with compressor running. If it
still will not reverse while running, replace
the valve.
with solenoid de-energized. If valve shifts,
reattempt with compressor running. If it
still will not reverse while running, replace
the valve.
Hot
Cool
Hot,
as (1)
Cool,
as (2)
Hot
Hot
Defective pilot.
Replace valve.
Warm
Cool
Warm,
as (1)
Cool,
as (2)
Warm
*TVB
Defective compressor.
Replace compressor
TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES