Specifications

69
7. If none of the previous steps were successful, the unit is
low on oil charge. Add oil to the oil separator using the
1
/
4
in. access fitting that the discharge pressure transducer
is mounted to.
8. To facilitate the oil charging process, ensure that the unit
is not running when adding oil. The system is under pres-
sure even when the unit is not running, so it is necessary
to use a suitable pump to add oil to the system.
9. Using a suitable pump, add
1
/
2
gal (1.9 l) of oil to the
system. Continue adding oil in
1
/
2
gal (1.9 l) increments
until the problem is resolved, up to a maximum of 1.5 gal
(5.7 l). If it is necessary to add factory oil charge levels to
the system contact your local Carrier representative.
Oil Filter Maintenance
— Each circuit has one oil filter locat-
ed externally to the compressor. Oil line pressure drop is
monitored by the control. Oil line pressure drop is calculated
by subtracting oil pressure (OP) from discharge pressure (DP).
If the oil line pressure drop exceeds 30 psi (206.8 kPa) for
5 minutes the control will generate a High Oil Filter Pressure
Drop alert. The High Oil Filter Pressure Drop alert will
not shut down the compressor, but instead indicates that the
oil filter is dirty. If oil pressure line losses exceed 50 psi
(344.7 kPa) then the control will shut down the circuit on
Maximum Oil Filter Differential Pressure Failure.
SOLENOID 1
SOLENOID 2
HIGH PRESSURE
SWITCH
MOTOR TEMPERATURE
SENSOR 2
COMMON
MOTOR TEMPERATURE
SENSOR 1
t e x t
C o m p r e s s i o n
P r o c e s s
H i g h P r e s s u r e O i l
D e - e n e r g i z e d
F L O W
V a l v e # 2 ( N O )
D e - e n e r g i z e d
N O F L O W
V a l v e # 1 ( N C )
B l e e d L i n e t o L o w P r e s s u r e S u c t i o n
l
D i s c h a r g e
P o r t
U n l o a d e r P i s t o n
C h a m b e r
t e x t
C o m p r e s s i o n
P r o c e s s
L o a d e d P o s i t i o n
H i g h P r e s s u r e O i l
E n e r g i z e d
N O F L O W
V a l v e # 2 ( N O )
E n e r g i z e d
F L O W
V a l v e # 1 ( N C )
B l e e d L i n e t o L o w P r e s s u r e S u c t i o n
S l i d e V a l v e
D i s c h a r g e
P o r t
U n l o a d e r P i s t o n
C h a m b e r
Loaded Position
High with
High
Pressure
Oil
Drain to
Low Pressure
Unloaded Position
Slide Valve
t e x t
H i g h P r e s s u r e O i l
T r a p p e d
O i l a t
H i g h
P r e s s u r e
C o m p r e s s i o n
P r o c e s s
P a r t L o a d P o s i t i o n
E n e r g i z e d
N O F L O W
V a l v e # 2 ( N O )
D e - e n e r g i z e d
N O F L O W
V a l v e # 1 ( N C )
B l e e d L i n e t o L o w P r e s s u r e S u c t i o n
S l i d e V a l v e
D i s c h a r g e
P o r t
U n l o a d e r P i s t o n
C h a m b e r
Slide Valve
FULLY LOADED OPERATION FULLY UNLOADED OPERATION
MAINTAIN POSITION
DISCHARGE
GAS THERMISTOR
ACCESS
FITTING
SUCTION
TEMPERATURE
Fig. 51 — Typical 06T Compressor
A30-4841
1
2
3
4
5
6
7
8
Fig. 52 — Typical Oil System
A30-4842
LEGEND
1—Oil Pressure Transducer
2—Oil Solenoid
3—Oil Filter
4—
1
/
4
in. FL (Female) Access Fitting
5—Shut-Off Valve
6—Oil Level Sight Glass
7—Oil Level Switch
8—
1
/
4
in. FL (Female) Access Fitting
CAUTION
Compressor oil is pressurized. Use proper safety precau-
tions when relieving pressure.