Mitsubishi Montero 1987 Service Manual Page 270

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24-34
AIR-CONDITIONING-Service Adiustment Procedures
r---- :
:ES
Dry bulb therr&neter
2OW825
PEAFORMANCE TEST
TESI
N24FWAB
NOTE
Air temperature in test room must be 21°C (70°F) minimum for this
test.
(1) Connect a tachometer and manifold gauge set.
(2) Set air conditioner controls to Max air conditioner, tempera-
ture lever on full cool, and blower on high.
(3) Turn engine on 1000 rpm with air conditioner clutch engaged.
(4) Engine should be warmed up with doors, windows, and hood
open.
(5) Insert a thermometer in the left center air conditioner outlet
and operate the engine for 5 minutes.
(6) Note the discharge air temperature.
NOTE
If the clutch cycles, take the reading before the clutch disen-
gages.
Performance Temperature Chart
Garage ambient
temperature
21
“C
26.5
“C
32
“C
37.5
“C
40.6
“C
(70
“F)
(80
“F) (90 “F) (100 “F) (I
05
“F)
Discharge air
temperature
Compressor
discharge pressure
Evaporator suction
pressure
1.7-4.4
“C
1.7-5.0
“C
1.7-5.6
“C
1.7-6.1
“C
1.7-6.7
“C
(35-40
“F)
(35-41
“F)
(35-42
“F)
(35-43
“F)
(35-44
“F)
928- 1,322 kPa 1.069-1.547 kPa 1,209-1,772 kPa 1,336-1,969 kPa 1,406-2,109 kPa
(132-188
psi)
(152-220
psi)
(172-252
psi) (190-280 psi)
(200-300
psi)
127-148 kPa
131-162 kPa 134-176 kPa
135- 188 kPa 136-194 kPa
(18-21
psi)
(18.6-23
psi) (19-25 psi) (19.2-26.8 psi) (19.4-27.6 psi)
REFRIGERANT LEAK REPAIR PROCEDURE N24FnAB
LOST CHARGE
If the system has lost all charge due to a leak:
(1) Evacuate the system. (See the procedure).
(2) Charge the system with approximately one pound of refriger-
ant.
(3) Check for leaks.
(4) Discharge the system.
(5) Repair leaks.
(6) Replace receiver drier.
Caution
Refrigerant
leak tester
Replacement filter-drier units must be sealed while in stor-
age. The drier used in these units will saturate water quickly
upon exposure to the atmosphere. When installing a drier,
have all tools and supplies ready for quick reassembly to
avoid keeping the system open any longer than necessary.
(7) Evacuate and charge the system.
LOW CHARGE
If the system has not lost all of its refrigerant charge; locate and
tester
repair all leaks. If it is necessary to increase the system pressure
up
to find the leak (because of an especially low charge) add refrig-
erant. If it is possible to repair the leak without discharging the
refrigerant system, use the procedure for correcting low refriger-
2OUO316
ant level.
1 STB Revision
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