Carrier XRV Spezifikationen PDF herunterladen (Seite 18)

CONTROL TRANSFORMERS (T1, T2) — These transform-

ers convert incoming control voltage to 24 vac power for the

3 power panel contactor relays, CCM, and ICVC.

OPTIONAL TRANSFORMER (T3) — This transformer pro-

vides 20 vac control power to DataPort™/DataLINK™

modules.

SENSORS — Two types of temperature sensors are used:

Figure 12 shows a typical temperature sensor for which

sensor wells are used, in systems having an ICVC controller.

For this type, the sensor cable cannot be separated from the

sensor itself, but the sensor can be readily removed from the

well without breaking into the fluid boundary.

The second type of temperature sensor is a thermistor,

which is installed either in the motor windings or at the thrust

bearing within the compressor. Both of these have redundant

sensors such that if one fails, the other can be connected exter-

nal to the machine. See Table 3 for a list of standard instrumen-

tation sensors.

The PIC III control determines refrigerant temperature in

the condenser and evaporator from pressure in those vessels,

read from the corresponding pressure transducers. See Fig. 13.

The pressure values are converted to the equivalent saturation

temperatures for R-134a refrigerant. When the chiller is run-

ning, if the computed value for EVAPORATOR REFRIG

TEMP is greater than, or within 0.6 F (0.33 C) of the LEAV-

ING CHILLED WATER temperature, its value is displayed as

0.6 F (0.33 C) below LEAVING CHILLED WATER tempera-

ture. When the chiller is running, if the computed value for

CONDENSER REFRIG TEMP is less than, or within 1.2 F

(0.67 C) of the LEAVING COND WATER temperature, its

value is displayed as 1.2 F (0.67 C) above LEAVING COND

WATER temperature.

Table 3 — Standard Instrumentation Sensors

SHRINK WRAP

STRAIN RELIEF

1/8” NPT

THERMOWELL

REMOVABLE

TEMPERATURE

SENSOR

Fig. 12 — Temperature Sensor Used

with Thermal Well

a23-1624

Fig. 13 — Control Sensors

(Pressure Transducers, Typical)

a19-957

TYPE LOCATION MONITORED REMARKS

Temperature

Entering chilled water Cooler inlet nozzle

Leaving chilled water Cooler outlet nozzle

Entering condenser water Condenser inlet nozzle

Leaving condenser water Condenser outlet nozzle

Evaporator saturation Sensor well on bottom of evaporator

Compressor discharge Compressor volute

Oil sump Compressor oil sump

Compressor thrust bearing Redundant sensor provided

Motor winding Redundant sensor provided

Pressure

Evaporator Relief valve tee

Condenser Relief valve tee

Oil sump Compressor oil sump

Oil sump discharge Oil pump discharge line

Diffuser (Compressor internal) Only in machines equipped with split ring diffusers

Entering chilled water (Optional) Cooler inlet nozzle

Leaving chilled water (Optional) Cooler outlet nozzle

Entering condenser water (Optional) Condenser inlet nozzle

Leaving condenser water (Optional) Condenser outlet nozzle

Angular Position

Guide vane actuator Potentiometer inside of actuator

Split ring diffuser actuator (Optional)

Potentiometer inside of actuator only on machines equipped

with split ring diffusers (split ring diffuser position not dis-

played on ICVC)

Pressure Switch High condenser (discharge) pressure Compressor volute, wired into the VFD control circuit

Temperature Switch Oil pump motor winding temperature Wired into the oil pump control circuit

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 189 190

Kommentare zu diesen Handbüchern

Keine Kommentare

Carrier XRV Spezifikationen Seite 18

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein Carrier XRV