Carrier T-326 Air Conditioner User Manual


 
6
T--326
Pressure Switch -- The systems use high and low pressure
switches wire d in series to control the power circuit of the
compre ssor clutch relay. If either pressure switch opens ,
interrupting the circuit to the clutch relay, th e operation of the
compre ssor will stop. When conditions re turn to normal the sw itch
will automatically re set and the compressor will resume operating.
The switches are non--adjustable.
Freeze--Up Thermostat -- Freeze--up t hermostats are used t o
prevent ice formation on the evaporator coil, which is an indication
that liquid refrigerat is getting back t o the compressor. Carri er
Transport Air Conditioning systems use a freeze thermostat
(freezestat) wired in series with the system pressure switches and
thermostat/thermistor to control the operation of the comp ressor
clutch.
Refrigerant -- A refrigerant is a material that is used to move heat
from the passenger compartment to the outside air. It is a
substance that gives up heat by condensing at high temperature
and pressures and absorbs heat by evaporating at low
temperatures and pressures. The heat transfer properties
exhibited w hen refrigerant changes s tate is the foundation of the
refrigerant cycle.
1.5 MODEL AND SERIAL NUMBER TAGS
In order to identify the air conditioning components you have, you
will need to know the model number and se rial number. All Carrier
T ransport Air Conditioning evaporators, condensers and
compre ssors have a model/serial number tag located on the
assemb ly. See Figure 1-2 for skirt mounted condenser data tag
location, Figure 1-3 for the CM--7/11 rooftop condensers data tag
location, Figure 1-4 for GEN 4 (Excel) evaporator data tag locati on
and Figure 1-5 for GEN 5 evaporator data tag location. Knowing
these l ocations and the information on the data tags will aid you in
identifying the correct service procedures.
Figure 1-2 Skirt Mounted Condensers