ALTROZ SERVICE MANUAL

HVAC

d) REPLENISHING COMPRESSOR OIL

(a) While re-installing the Original Compressor

1. Drain and measure the refrigerant oil contained in

the compressor.

2. Charge oil through the discharge port of the com-

pressor with the same amount of new refrigerant

oil.

NOTE

If the amount of oil in the original compressor was

not checked, then approximately 70±10 ml. of new

oil should be added to the compressor being in-

stalled. (This is assuming the compressor being

installed has first been drained).

(b) While installing a New Compressor

A new compressor (1) comes with a certain amount

of oil (A) sealed in it. When replacing the old com-

pressor (2) with a new one; an amount of oil (C) as

calculated below should be drained from the new

compressor.

“C” = “A” -“B”

“C” = Amount of oil to be drained

“A” = Amount of oil sealed in a new compressor (1)

“B” = Amount of oil remaining in old compressor (2)

NOTE

As it is necessary to replenish oil by approximately

the same amount which is remaining in old compres-

sor, draining of additional oil from the New

Compressor becomes necessary.

Following table illustrates the amount of oil to

be replenished for respective HVAC/AC com-

ponents

Replaced part Amount of compressor oil to

be replenished (in CC)

Evaporator

(front)

Evaporator

(Rear)

Condenser

Hoses

Pipes

NOTE

When only charging refrigerant without replacing any

component, replenish the same amount of measured

oil when recovering refrigerant, if not measured, re-

plenish 30cc oil.

CAUTION:

Specify SP10 oil for compressor Top-Up.

e) PRESSURE TEST

USING

MANIFOLD

GAUGES

This is a method where trouble is detected and re-

paired by using manifold gauge. The manifold gauge

indicates the refrigeration cycle high and low pres-

sure side pressures on the respective gauge.

NOTE

Make sure following conditions are fulfilled before

getting the correct gauge readings (after engine has

warmed –up

)

Engine speed

1500rpm

A/C inlet temperature

(Ambient Temperature)

30° - 35° C (86° - 95°

Blower speed

High

Temperature Control

Full cold

Reference value be-

fore AC operation at

both high and low

pressure sides

5-8 kg/ cm

(0.5 - 0.8

MPa)