Carrier GEN IV Servisní příručka stáhnout pdf (Strana 24)

3-- 1

T -29901/08

SECTION 3

TROUBLESHOOTING

3.1 INSUFFICIENT OR NO COOLING

3.1.1 Preliminary Checks

Make certain that the evaporator filters are not clogged

with dirt. Check to make certain that all vehicle body

openings are air tight. Check the adjustment and

condition of the compressor drive belt (s); adjust or

replace as necessary. Refer to Section 4, paragraph

4.12 for complete drive belt installation and

maintenance procedures.

3.1.2 Checking System Air Output

If the evaporator air flow appears less than normal,

check the evaporator filter and coil for dirt and

obstructions. Clean where necessary. Check the blower

assembly for proper operation. Current draw will vary as

to evaporator , speed setting and voltage. See Table 3-1,

Table 3-2 or Table 3-3 for approximate evaporator

current draw. If the current drawn by the motor is not to

specifications, replace the motor.

3.1.3 Check The Sight Glass For Bubbles

If the preceding steps do not remedy the problem, check

the sight glass for bubbles. Run the vehicle engine at

high idle (approximately 1200 RPM) while maintaining a

minimum discharge pressure of 150 psig. The

thermostatic switch should be positioned for maximum

cooling.

Bubbles in the sight glass indicate an undercharge of

refrigerant and/or a restriction in the liquid line. If the

charge is low, check the system for leaks; repair if

necessary and charge the system with the proper

amount of refrigerant.

NOTE

Under certain ambient conditions a few bubbles

may appear in the sight glass. Refer to Section

4, Table 4-5 to determine if system has correct

charge.

No bubbles in the sight glass will indicate either a full

charge or a complete loss of refrigerant. To determine if

there is refrigerant in the system, run the vehicle engine

at high idle (approximately 1200 RPM) with the

thermostatic switch positioned for maximum cooling.

Allow system to stabilize, then shut system down while

observing the sight glass. If bubbles begin to appear, the

system has a refrigerant charge. If no bubbles appear,

system is without refrigerant.

A restriction in the liquid line can be found by feeling the

liquid line. Any portion that is cold to the touch or that

frosts up is restricting the refrigerant flow .

Table 3-1 Evaporator Current Draw (GEN 4)

MODEL

VOLTAGE

SPEED SETTING AND AMP DRAW (COLOR)

LOW -- (Red) MED. -- (Yellow) HIGH -- (Orange) HIGH PERF. -- (Black)

EM--1

12.5 VDC 8.6 Amp 14.4 Amp 18.5 Amp 30 Amp

13.5 VDC 10 Amp 15 Amp 19.4 Amp 32 Amp

24.5 VDC 7.8 Amp 10.7Amp 12.7 Amp 16 Amp

EM--2

12.5 VDC 5.0 Amp 8.0 Amp 10 Amp 17 Amp

13.5 VDC 6.0 Amp 9.0 Amp 12 Amp 20 Amp

25 VDC 4.5 Amp 6.0 Amp 6.5 Amp 9Amp

EM--3

12.5 VDC 11 Amp 22 Amp 28 Amp 47 Amp

13.5 VDC 12 Amp 25 Amp 30 Amp 52 Amp

24.5 VDC 6.0 Amp 14 Amp 17 Amp 21 Amp

EM--6

12.5 VDC 4.6 Amp 7.5Amp 9.4 Amp 16 Amp

13.5 VDC 5.1 Amp 8.4 Amp 10.6 Amp 19.3 Amp

24.5 VDC 4.0 Amp 6.0 Amp 7.0 Amp 9.0 Amp

EM--9

12.5 VDC 8.1 Amp 15 Amp 32 Amp 37.1 Amp

13.5 VDC 10.3 Amp 18 Amp 33.2 Amp 37.4 Amp

EM--14

12.5 VDC 7.0 Amp 10 Amp 21 Amp Not Applicable

13.5 VDC 8.0 Amp 11 Amp 23 Amp Not Applicable

24.5 VDC 4.0 Amp 6.0 Amp 10 Amp Not Applicable

IW--1 12.5 VDC 7.7 Amp 11.5 Amp 24 Amp --

IW--2 12.5 VDC -- -- 21 Amp --

IW--7 12.5 VDC -- -- 15 Amp --

IW--14 12.5 VDC 7.0 Amp -- 18 Amp --

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 55 56

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