Carrier Performance 48VR-A Manual de instrucciones descargar pdf (Pagina 49)

MOTOR

FAN GRILLE

MOTOR SHAFT

A08505

MAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADE

SIZE

“A”

IN. MM

24 6.3 160

30 6.3 160

36 7.6 193

42 7.6 193

48 7.6 193

60 7.6 193

Fig. 23 -- Fan Blade Position

Gas Input

The gas input does not require checking unless improper heating

performance is suspected. If a problem exists, refer to the Start--Up

section.

Evaporator Airflow

The heating and/or cooling airflow does not require checking

unless improper performance is suspected. If a problem exists, be

sure that all supply-- and return--air grilles are open and free from

obstructions, and that the air filter is clean. When necessary, refer to

the Indoor Airflow and Airflow Adjustments section to check the

system airflow.

Defrost Thermostat

The defrost thermostat is usually located on the lowest liquid

leaving circuit of the left (See Fig. 24). The thermostat closes at

32_F(O_C) and opens at 65_F(18_C)

The defrost thermostat signals heat pump that conditions are right

for defrost or that conditions have changed to terminate defrost. It

is a thermally actuated switch clamped to outdoor coil to sense its

temperature. Normal temperature range is closed at 32_  3_F(0

 1.7_C) and open at 65_  5_F(18 2.8_C).

FEEDER TUBE

STUB TUBE

DEFROST

THERMOSTAT

C99029

Fig. 24 -- Defrost Thermostat Location

Puron Items

Metering Device

(Thermostatic Expansion Valve &

Piston)

This unit uses both a hard shutoff, balance port TXV in the indoor

coil and a piston in each side of the outdoor coil. The TXV

maintains a constant superheat at the evaporator coil exit (cooling

mode) resulting in higher overall system efficiency.

Pressure Switches

Pressure switches are protective devices wired into control circuit

(low voltage). They shut off compressor if abnormally high or low

pressures are present in the refrigeration circuit. These pressure

switches are specifically designed to operate with Puron (R--410A)

systems. R--22 pressure switches must not be used as replacements

for the Puron (R--410A) system.

Loss of Charge Switch

This switch is located on the liquid line and protects against low

suction pressures caused by such events as loss of charge, low

airflow across indoor coil, dirty filters, etc. It opens on a pressure

drop at about 20 psig. If system pressure is above this, switch

should be closed. To check switch:

1. Turn off all power to unit.

2. Disconnect leads on switch.

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

NOTE: Because these switches are attached to refrigeration

system under pressure, it is not advisable to remove this device for

troubleshooting unless you are reasonably certain that a problem

exists. If switch must be removed, remove and recover all system

charge so that pressure gauges read 0 psig. Never open system

without breaking vacuum with dry nitrogen.

High--Pressure Switch

The high--pressure switch is located in the discharge line and

protects against excessive condenser coil pressure. It opens at 650

psig.

48VR-- A

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Carrier Performance 48VR-A Manual de instrucciones Pagina 49

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