Komatsu Breathesafe WA900-3EO, Installation Overview

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Page 34
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WA900-3EO
FAULT DIAGNOSIS OVERVIEW
FAULT DIAGNOSIS
Our flowcharts are included as an aid in
trouble shooting the air conditioning system
should it develop a fault.
In many cases, a problem that causes an air
conditioning system to malfunction requires
little time to investigate and repair. These
possible causes should be the first to be
examined and corrected.
Use the flow charts, in conjunction with the
gauge set to determine the cause of the
problem and then carry out the remedy
prescribed.
As a general guide to correct system per-
formance, the Discharge / Suction Table is
included to show the acceptable discharge
and suction gauge pressures against the
ambient temperature during unit operation,
To use the Discharge / Suction Table pro-
ceed as follows:
1. Set air conditioning fan speed switch to
“HIGH FAN”.
2. Set mode switch to “COOL” position,
and thermostat to “COOLER” position.
3. Record ambient temperature.
4. Check pressure in table against appli-
cable ambient temperature.
DISCHARGE - SUCTION TABLE
Ambient
Temp.
(
o
C)
COMPRESSOR
Discharge
Pressure
(kPa)
Suction
Pressure
(kPa)
16
o
850 - 1200 20 - 100
21
o
1050 - 1750 20 - 100
27
o
1250 - 1900 20 - 100
32
o
1400 - 2150 30 - 150
38
o
1600 - 2300 30 - 200
43
o
1900 - 2500 30 - 250
REFRIGERANT SIGHT GLASS
The refrigerant sight glass incorporated in
the top of the receiver drier, can be a valu-
able aid in quickly determining the cause of
a system malfunction.
For correct interpretation of sight glass
indications, the following table has been
included for your reference.
SIGHT GLASS INDICATOR TABLE
C
le
ar
Indicates that the system
has correct refrigerant
charge. It may also indi-
cate a complete lack of
charge or overcharge,
both of which can only be
checked with gauges.
F
oa
m
y
Indicates that the system
is low on charge and prob-
ably contains air.
Occasional bubbles at
start-up is normal.
O
il
S
tr
ea
ks
Indicates lack of charge
and compressor oil is
circulating through system.
C
lo
ud
y
Indicates dessicant
contained in receiver drier
has broken down and is
circulating through the
system.
O
cc
as
io
na
l
B
ub
bl
es
Indicates system slightly
low on charge.
Receiver drier may be
saturated and releasing
moisture into the refriger-
ant system.
FAULT DIAGNOSIS