Troubleshooting - Carrier Miracool Owner's Manual

EVAPORATOR COMPARTMENT
SERVICING
DANGER
U
Before servicing unit,
service. Failure to disconnect electrical service
could result in electrical shock and cause
personal injury or death.
1. After disconnecting the unit from the power
supply, remove the grille retaining screw
located in the upper-most part of the grille.
(See Figure 2)
2. Lift the grille up and away from the unit.
3. Unplug the power supply cord located at the
bottom of the cabinet. (See Figure 3)
4. Remove the 4 philips screws that hold the
evaporator cover. (See Figure 10)
5. Hold the cover until it is completely loose
and hanged by the supporting pins. (See
Figure 11).
DANGER
U
Before servicing unit,
service. Failure to disconnect electrical service
could result in electrical shock and cause
personal injury or death.
FIGURE 10 – RELEASE EVAPORATOR COVER
FIGURE 11 – EVAPORATOR COVER SUPPORT
disconnect electrical
disconnect electrical
EVACUATION
Moisture in a refrigeration system may affect
performance.
When large amounts of moisture are present,
system freeze ups will occur. Even in minute
amounts, moisture will combine with refrigerants
to form an acid.
The corrosive action of this acid forms sludge,
which will plug the lines and drier.
Since most field type vacuum pumps cannot pull a
low enough vacuum to remove all moisture from
the system, it is recommended that the system be
triple evacuated, breaking each time with dry
refrigerant nitrogen. Use care to purge air from the
charging hose when breaking the vacuum.
CHARGING REFRIGERATION
SYSTEM
Refer to Table 2 for refrigerant type and amount of
charge. Since capillary tube systems have small
critical refrigerant charges, it is recommended that
a field charge either be weighed in or transferred
from a portable charging cylinder. After maximum
vacuum has been obtained as detailed above,
attach charging cylinder to the system line making
sure to purge air from hose with refrigerant. With
the unit running, allow refrigerant to run slowly into
the system until the desired charge is reached.
When using refrigerant blends it is recommended
to charge into the high side of the system with the
initial charge and then add any remaining charge
into the suction side; however, care must be taken
to meter the remaining amount into the low side
so that excess liquid does not enter the
compressor.

TROUBLESHOOTING

Refer to Table 3 and Figure 12.
9