Rolls-royce Silver cloud ii User manual

~,

Air

Conditioning

System

Manual

AIR CONDITIONING

(REFRIGERATION)

Printed in Great Britain

by

William Hodge & Chilver Limi1ed, London

PREFACE

The

primary purpose

of

thi~ Manual is to provide the

refrigeration engineer with information necessary to enable him

to service and maintain the Rolls-Royce Refrigeration System.

The Manual will also be

of

great assistance to

the

motor

car

engineer wishing to familiarise himself with the function and

position

of

the various components.

Contained herein is a description

of

the system and

comprehensive instructions for the maintenance, dismantling

and

assembly

of

each unit, together with the necessary service

procedure. All special tools required to carry

out

service opera-

tions are listed and illustrated.

Although all information provided within the Manual was

correct when going to print, additions or modifications may

subsequently be necessary. These will be brought

to

the notice

of

the reader by means

of

Service Bulletins,

and

it is recom-

mended that a note be made in the appropriate Section

of

the

Manual, referring to the latest Bulletin.

Advice

and

assistance regarding maintenance

and

servicing

problems will always be available

on

application to the Service

Department

at

Pym's Lane, Crewe; all such enquiries should

be accompanied by the chassis number

of

the car.

AIR CONDITIONING

REFRIGERATION

UNDERWING

UNIT

INTRODUCTION

The underwing air conditioning system fitted to Standard Steel

Saloon Rolls-Royce Silver Cloud II

and

Bentley S.2 motor cars

provides de-misting, de-frosting,

car

heating

and

ventilation.

Alternatively, a comprehensive underwing refrigeration system,

providing a wide range

of

heating

and

cooling conditions, can

be installed at the customer's request.

Whilst servicing

of

the

standard

heating

and

de-misting

system may be undertaken with confidence by

the

normal

service engineer,

it

must be appreciated that correct main-

tenance

of

the refrigeration system will be better effected by a

specialised refrigeration engineer.

Special equipment

and

precautions are necessary when

un<lenaking

scrvidng

and

overhaul

operations

and

it

should

be

always

remembered that

the

refrigerant

circulation system is

sealed

and

pressurised.

Thus

join

ls

should not

bl!

disturbed

unnecessarily as

the

system must be discharged prior to

breaking any joint, unless this

is

protected by service valves.

The Refrigeration System, although

an

optional extra, is in

fact not an isolated unit, but a large system carefully integrated

into the design

of

the motor car. The electrical wiring, in most

cases, is combined in th~ main wiring looms

and

the individual

mechanical

and

electro•mechanical control units have been

installed in positions promoting simplicity

of

operation

and

the

facilitation

of

servicing.

AI/ enquiries should be addressed

to:-

ROLLS-ROYCE

LIMITED

Pym's Lane

Crewe

Cheshire

Telephone:

Crewe

55155

Telegrams:

"ROYCRU,

CREWE"

T.S.D. Publication 123

Printed in England

CONTENTS

DESCRIPTION SECTION C.l

OPERATING

THE

SYSTEM SECTION C.2

ELECTRICAL

COMPONENTS . . SECTION

C.3

COMPRESSOR, CONTROL VALVES AND ANCILLARY

UNITS . . SECTION

C.4

MAINTENANCE

SECTION

C.5

SERVICING

. . SECTION C.6

INDEX

Description

To

remove

and

fit

16

Operating

the

system

5 Receiver ..

18

Maintenance

Electrical

components

Schedules

..

21

Actuators

..

9 Every 2,500 miles

21

To

adjust

10

Every 5,000 miles

21

Blower motors

13

Every 10,000 miles

or

annually

21

Evaporator change-over relay

12

Servicing

Lower airstream switch

..

8 Charging the system

28

Magnetic

clutch

-compressor II Checking for leaks 29

Rear

window de-mister relay

12

Discharging the refrigerant

26

Resistances -blower motors

13

Evacuating the system

27

Solenoid valves II Fault diagnosis

23

Thermostatic switches

..

9

Air

delivery

24

Upper airstream switch

..

7

Fault

location

24

The

compreMor,

control

valves

and

ancillary

unil.8 Pressure tests

26

Compressor

IS

Refrigerant circulation

24

Fault

diagnosis

15

Superheat test

..

26

Lubricant

17

Importance

of

chemical stability

23

Oil level -

lo

check

17

Sealing

of

components

23

r--,

~

Shal\

seal -to replace

17

Precautions

to

be observed

23

-

To

purge the

air

18

Exposure to refrigerant

23

al

' To remove

and

fit

IS

First-aid

treatment

23

....

M

r--, Condenser

18

Right-hand front

wing

-

to

remove

29

0

v.i

Drier

19

Special tools required

23

i,..;

Expansion valves

19

Sweeping the system

27

Flow

control

valve 20 Underwing

unit

-to

remove

30

Magnetic clutch

..

15

To

fit

30

F

RESH

WMM

OR

C

OO

L

AIR

TO

CAR INTERIOR

P.ECIR

C

ULA

T

EO

WARM

OR

COOL

AIR

TO

REAR

COMPARTMENT

RE

CIRCULATED

WM

M

OR

COO

L

AIR TO F

RONT

COMPARTM

EN

T

REC

IRCULATI

NG

AIR

INTA

KE

FILTER

BLOWER

HOTOR

EXPANSION VALVE

SOLENOIDE VALVE

Fig,

l '

The

air

condiliomn8

sy•ten:,

CONDENS

EP.

FLOW

CO

NTP.

OL

VA

LVE

I '

HE

ATER

FL

AP

F

LAP

ACT

UA

TO

RS

/

EV

A

POR

ATOR

MA

TRIX

EVAPORATOR MATR

IX

F

RE

SH AIR -

RECIRCULATED

AIR

-

Rolls-Royce &

Bentley-------

Air Conditioning

Sy.stem

Manual

SECTION

C.l

DESCRIPTION

The function

of

the

Rolls-Royce

Air

Conditioning

Unit

is

to

maintain

the

car

interior

temperature

and

humidity

at

a comfortable level

in

all climatic

conditions.

The

unit

is

divided

into

two

parts

-

the

fresh

air system,

and

the recirculatory system; these

PHIAL

~

EV

APORATOR MATRIX

TEMPERATURE

CO

NTROL PHIAL

-4===

/

EVAPORA

TO

R

MA

TR

IX

L.P. VAPOUlll D

H.

P.

VAPOUR •

H.P.

LIQUID

•

VALVE

~

SOLE

NOI

D VALVE

VALVE

/

SOLENOID VAL

VE

may

be

operated

independently or

together

in

order

to

produce

the

desired condition.

The

fresh

air

s

ystem

introduces

heated,

cooled

or

ambient

temperature

air

into

the

car

interior

;

the

re-

circulatory system draws air from

the

car interior,

conditions

it,

and

re-introdu

ces it.

C

ON

D

ENS

ER

~

I

COMPRESSOR

FLOW

co~

VALVE

ORI~

es

,

Ft1,

2

Dla«r•m

of

refrigerant

circ11l•tion

P

age

1

Air

Conditioning

Sy.stem Manual

-------

Rolls-Royce & Bentley

------------

The

main

advantage

of

this feature is that

although recirculation enables the air conditioning

system to operate more effectively, the

simultaneous introduction

of

fresh

air

provides

adequate

ventilation, permitting the

car

to

be

driven with

the

windows closed.

In

countries where humidity

is

high, the unit

will

extract

a large

proportion

of

moisture from

the air;

if

necessary,

the

heater may

be

used

in conjunction with the refrigeration system to

provide warm, dry air when the atmosphere is

cool

and

damp

.

Fine

gauze .filters incorporated in the recircula-

tion

and

fresh air intakes (see Fig.

1)

, prevent

the ingress

of

grit

and

other foreign particle

s.

The

refrigeration

sys

tem

operates

on

a cyclic

principle: after being compressed

in

the com-

pressor, the refrigerant passes

to

a condenser and

then

in

liquid

form

to

a valve where

it

expands

and

then evaporates in a matrix before returning

to the compressor.

During evaporation,

the

gas absorbs heat from

the air

passing

over

the

matrix surface.

The

air

thus enters the

car

at

a reduced temperature, also

at

reduced humidity, since a proportion

of

the

water va

pour

in

the air will condense during the

cooling process

and

drain away through drain

holes provided.

The system

is

charged with Freon

12

refrigerant

(Dichlorodifluoromethane) circulated

by

the com-

pressor.

The

compressor is driven

via

a magnetic

clutch by Vee belts from the coolant pump pulley.

The

compressor

delivers refrigerant

to

the

condenser mounted in front

of

the engine radiator

matrix, where

the

gas is condensed to liquid.

A series

of

pipes incorporating

re

ceiver, drier,

solenoid valves

and

expansion valves connects the

condenser to the evaporator unit

s.

Page2

H

IGH

PRESSURE SER.VICE V

AL

VE

2

LOW

PR

ESS

UR

E SERVICE

VALVE

CO

MPRESSOR

OIL

Fl

ll

ER

PLUG

IMPORTANT:

Ref

er

to co

mpr

essor

deta

ilr

for

instructions regarding the

removal

of

this

plug

.

Fig.

3 Compre&&or

in

po@ition

The

refrigerant

is

atomised in the expansion

valves before entering

the

evaporators, where the

resultant pressure

drop

permits

the

liquid to

vaporise

ar;id

so absorb

heat

from

the

air

passing

through

the matrices.

Air

is ducted to the evaporators by two systems:

From

the air

intake

situated

at

the

front

of

the

right-hand

wing, fresh air is ducted along inside

"'

0

.....

------------

Rolls-Royce

&

Bentley-------

Air

Conditioning

System

Manual

the wing

and

boosted, by means

of

a blower

motor, through the upper evaporator matrix

and/or

the top half

of

the heater matrix.

The

air

is delivered

into

the saloon through the capping

rail adjustable outlets

and

the windscreen

de-misting slots.

The recirculating air is ducted from the air

intake, situated behind the right-hand front seat,

and

b~osted,

by

means

of

a blower motor,

through the lower evaporator matrix

and

the

lower half

of

the heater matrix.

It

then enters the

saloon via the cross duct under the facia, the

adjustable

duct

under

the

front

picnic tray,

and

the

duct

on

the left-hand side

of

the scuttle.

To

prevent

the

temperature

of

the

air

passing

through the evaporator falling below freezing

point

and

the system becoming blocked by the

formation

of

ice, a thermostatic switch is fitted

to

each matrix:

and

is used in

conjunction

with the

solenoid valves to control the

flow

of

refrigerant.

If

both

solenoid valves are closed, the refrigerant

is

by-passed from the condenser back to the com-

pressor through the

flow

control valve.

The

con-

trol valve is adjusted to maintain a minimum

pressure

of

2 lb./sq. in. in

the

low pressure side

of

the system. The thermostatic switches control the

minimum temperature

of

the evaporators and

must

not

be

~et

below 2"C., otherwise icing may

occur.

Page3

LOWER

AIRSTREAM

SWITCH

FEED

FR.OM

COOLANT

TEMP,

INDICATOR

.....-11

,I

l ~cl

) 8

~5

7

UPPER

l

wr',

:

1\

AI

RSTREAM

---

-te--

:i;iel

.

193

SWITCH

~ ,

' , i 8

FRESH

AIR

BLOWER

MOTOR

RESISTANCE

-

DISTRIBUTION BOARD -

TO

REAR

WINDOW

DE·MISTER

I;;.

::

~ERMINAL STIii -

---...:•.;.•

Io

o o o

".I.

RECIRCULATING

All\6LOWE

~ 7

~

<

rr===============(._J====:::!.1

11

I~

....

.....

~

DE-tt1STl:R

...

L

CROSS

DUCT

,,,~,o;w

j ~

J~

I

~

~·

rll-

---

-------

-~

,-....

SOLENO

\::'-=

aoiii,,,/..i,,_

.....

I

~

'I,

VAL.YES

(,......

L..

___

R_E_A

c:.

R

____

....;.

LO_O.:..M

______

..J (OWER- ' -

l

..

-

Fig.

"

Wii·ing

diagram

-

Air

conditioning

M:Y81nn

.,.,.-

REC

IRCULATING Al

l\

RESISTANCE

I ~NGINE

LOOM

COHPRESSOR

CLUTCH -

HEATER

-

FLAP

ACTUATOR

FRESH

· ~

FLAP ACTUATOR

TRANSFER

DUC

T

THERMOSTAT

....

~

•

WATER

TAP

.--

ACTUATOI< ,.

·~

__!

E

~r.:i~~~-.1

.__

"

----=.1.:i

I

~:::r-"I

.,

'"'------

R.H. VALANCE LOOM

~

f===i'

) l

1

·-

-

FRE

SH

AIR BLOWER MOTOR

Bl1B

L06lR/£rL ·cnn.

(')

~

""(

-·

..

..,

~

l'D

n

3 0

:i

~

Q.

~

Q

-.

:i

0

C:

:i

-.

Q

:i

-

OQ

s

0\

-

o:i

I

------------

Ro/ls-Royce

&

Bentley

-------

Air

Conditioning

System

Manual

SECTION

C.2

OPERATING THE SYSTEM

The system

is

controlled by two switches mounted

on

the facia board

and

marked

'UPPER'

and

'LOWER'.

The

'UPPER'

switch controls the fresh air system

and

regulates the air entering the saloon from the

adjustable vents

on

either side

of

the capping rail

and

from the windscreen de-misting slots. This

switch has seven positions -four positions clock-

wise which control the heating system, and three

positions anti-clockwise which control the

refrigeration.

To obtain the desired condition when operating

the refrigeration, the switch must

be

rotated anti-

clockwise.

In the first position the evaporator flap will be

fully open and the heater flap fully closed; the

water tap will be closed

and

the blower motor

operating

at

medium speed. This results in normal

ambient

air

enteri'ng the saloon.

In

the second position both the evaporator flap

and

the

heater flap will be fully open; the water

tap will be closed, the compressor operating and

the blower motor running

at

medium speed. The

result

is

a mixture

of

ambient

and

refrigerated air

passing from the top half

of

the heater matrix and

the upper evaporator unit.

In the third position the evaporator flap will be

fully open, the heater flap will be fully closed, the

water tap will be closed, the compressor operating

and the blower motor at medium speed. This

results

in

cold air entering the saloon via the

upper

evaporator.

If

the

knob

of

the

'UPPER'

switch is pulled out

whilst

turned

to any

of

its positions,

the

blower

motor

operates

at

full speed.

The

'v;>WER'

switch controls the recirculating

system

and

has

five

positions.

Three

positions

clockwise control the heating system

and

the two

positions anti-clockwise control the refrigeration

system.

In

the

first position anti-clockwise

the

water

tap

will be closed, the compressor operating and

the blower motor at medium speed. This results

in cold recirculated air entering the saloon via the

lower evaporator.

In

the second position anti-clockwise the water

tap will be closed, the compressor operating and

the

blower

motor

at

full speed. This results

in

recirculated air

of

minimum temperature entering

the saloon.

Page 5

----------

- - Rolls-Royce &

Bentley--

- -

--

-

Air

Conditioning

System

Manual

SECTION C.3

ELECTRICAL COMPONENTS

UPPER

AIRSTREAM SWITCH

This switch controls

the

heater

and

evaporator

flap actuators, the fresh air blower motor, the

compressor clutch

and

the water tap actuator.

The switch utilises eight angular positions -the

vertical

or

OFF

position, four positions clockwise

and

three positions anti-clockwise.

In

all seven operating positions, with the switch

knob

'in',

the

fresh

air

blower

motor

operates at

medium speed.

When the switch knob is pulled outwards, all

seven conditions

are

duplicated but with

the

blower motor operating .at full speed. This

is

achieved by the provision

of

a

contact

sleeve

at

the end

of

the switch spindle. This sleeve connects

two fixed

contacts

when the

knob

is pulled out-

wards, thereby completing a new circuit by-

passing the resistance.

The

main

switch mechanism consists basically

of

five

sets

of

moving contacts which rotate when

the control

knob

is

turned. Lobes

on

these con-

tact plates

'make'

and

'break'

with eleven sets

of

fixed contacts spaced

around

the

arc

of

travel

of

the contact Jobes.

A numbered disc is attached to the rear

of

the

switch for terminal identification, the

key

to which

is as

follows:-

Terminal Number

1 Water

Tap

'Leak'.

2

Evaporator

Flap

Closed.

3 Supply.

5 Heater Flap t Open.

6 Heater Flap Fully Open.

7 Water

Tap

Closed.

8 Heater Flap Closed.

9 Compressor Clutch 'In'.

10

Evaporator Flap Fully Open.

11

Blower Motor

Medium

Speed.

12

Blower Motor Full Speed.

13

Evaporator Flap t Open.

14

Evaporator Flap t Open.

Switch

positions

1st

clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

Blower

Motor

FULLY

OPEN

CLOSED

LEAK

POSITION

MEDIUM

SPEED

Providing

Normal

ambient

air

flow at

Medium Speed.

(Heater

Matrix warming in

readiness for

2nd

position.)

2nd clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Blower

Motor

!

OPEN

f

OPEN

LEAK

POSITION

MEDIUM

SPEED

Providing

Mixed flow

of

ambient

and

warm

air.

3rd clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Blower

Motor

J

OPEN

f

OPEN

LEAK

POSITION

MEDIUM

SPEED

Providing

As

above, but air

of

increased

temperature entering the car.

4th clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Blower

Motor

CLOSED

FULLY

OPEN

LEAK

POSITION

MEDIUM

SPEED

Providing

Maximum

air

temperature

permitted

by

coolant

leak.

N.B. Knob pulled fully

out

in

any

position-

blower motor operates

at

FULL

SPEED.

Page

7

Air

Conditioning

System

Manual

-------Ro/1$-Royce

&

Bentley------------

1st

anti-clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Blower

Motor

FULLY

OPEN

CLOSED

MEDIUM

SPEED

Providing

Air

of

ambient

temperature

entering the car.

2nd anti-clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Compressor

Blower

Motor

FULLY

OPEN

FULLY

OPEN

CLOSED

OPERATING

MEDIUM

SPEED

Providing

Ambient

and

cold

air

flow via the

upper

heater

and

upper evaporator matrices.

3rd anti-clockwise

Evaporator

Flap

Heater

Flap

Water

Tap

..

Compressor

Blower Motor

FULLY

OPEN

CLOSED

OPERATING

MEDIUM

SPEED

Providing

Air

of

minimum

temperature

entering the car via the upper evaporator

matrix.

N.B.

If

the

switch knob is pulled out, the blower

motor operates

at

FULL

SPEED.

LOWER AIRSTREAM SWITCH

This switch

controls

the recirculatory blower

motor, the water tap actuator and the compressor

clutch.

Six positions are utilised -the vertical

or

OFF

position, three positions clockwise

and

two posi-

tions anti-clockwise.

The

construction

and

operation

of

the

mechanism

is

similar

to

that

of

the

upper

air-

stream switch except that no 'pull-out' mechanism

PageS

is

provided

for

blower

motor

full

speed

-full

speed is only obtained in position three clockwise

and

position two anti-clockwise.

Lobes

on

four sets

of

moving contacts complete

circuits with combinations

of

the nine sets

of

fixed

contacts.

A numbered disc is attached to the rear

of

the

switch to assist terminal identification; the key

to

these numbers

is

as

follows:-

Terminal Number

l Recirculation Blower Motor Full Speed.

2 Recirculation Blower Motor Medium Speed.

3 Supply.

4 Water

Tap

'Leak'.

5 Supply from Upper Airstream Switch No. I

Terminal.

7 Water

Tap

Closed.

8 Supply from Upper Airstream Switch No. 7

Terminal.

9 Compressor Clutch 'In'.

11

Water

Tap

Open.

Note: The system will

not

provide warm fresh

air

and

cold recirculated air simultaneously.

If

the

lower

airstream

switch is

in

a 'cold'

position

(anti-clockwise)

the

water

tap

remains

closed for all positions

of

the upper airstream

switch, either clockwise

or

anti-clockwise.

If

the

Jower

airstream

switch is 'off'

or

in

position I clockwise, the

upper

airstream

switch

selects water

tap

leak

for all clockwise positions.

If

the lower airstreamswitch

is

in positions 2

or

3

clockwise, the upper airstrearn switch selects water

tap

open for all clockwise positions.

Switch

positio,u

1st

clockwise

Water

Tap

..

Blower

Motor

LEAK

POSITION

MEDIUM

SPEED

Providing

Warm

recirculated air.

2nd

clock

wise

Water

Tap

..

Blower

Motor

OPEN

MEDIUM

SPEED

- -

----------

Rolfs-Royce &

Bentley-------

Air

Conditioning

System

Manual

Providing

Recirculated

air

of

increased

temperature.

3rd'clockwise

Water

Tap

Blower

Motor

OPEN

FULL

SPEED

Providing

Recirculated

air

of

maximum

temperature.

1st

anti-clockwise

Water

Tap

..

Compressor

Blower

Motor

CLOSED

OPERATING

MEDIUM

SPEED

Providing

Cold recirculated air entering the

car

via

the

lower

evaporator

matrix.

2nd anti-clockwise

Water

Tap

..

Compressor

Blower

Motor

CLOSED

OPERATING

FULL

SPEED

Providing

Recirculated

air

of

minimum

temperature

entering

the

car

via

the

lower

evaporator matrix.

THERMOSTATIC SWITCHES

The Cartridge

Thermostat

consists

of

two

silver contacts.attached to, but insulated

from,

two special nickel steel members

of

low expansion

co~fficient, mounted

under

tension in a seamless

drawn brass tubular shell.

Changes in

temperature

cause

the

shell

to

expand

or

contract, subjecting the steel contact

supports

to

changes

of

tension, thereby causing

the contacts

to

•make'

or

'break'.

Two

thermostats

are

incorporated

in the

system,

each

controlling

one

of

the solenoid

valves which regulate the supply

of

refrigerant to

the evaporator matrices. When the temperature

of

the

air

leaving the matrices falls to a level a little

above freezing point; the flow

of

refrigerant

is

cut

off,

in

order

to

prevent

the

matrices becoming

blocked by ice formation.

Adjustment

of

the cut-off

point

is effected by

varying

the

tension

in

the

nickel steel members

by means

of

a vernier screw which is accessible

when the thermostat rubber end cover

is

removed

(see Fig.

5).

Setting

the

switch

should

be

attempted

only

with the aid

of

a power source and indicator light.

Random

operation

of

the setting screw, without

positive indication

of

the 'make'

or

'break'

of

the

contacts, may strain the internal assembly.

A locking clamp is provided to ensure that the

setting

remains

undisturbed

by vibrations,

and

should be adjusted so that the vernier screw may

be

turned

without

undue

strain; this

should

be

carried

out

before final adjustment

of

the switch,

since tightening

of

the locking screw after adjust-

ment may alter the setting.

Care

should

be exercised in handling the

thermostat, since it

is

the outside shell which

forms the operating element

and

distortion

of

this

shell may affect the operation.

ACTUATORS

The heater flap, evaporator

flap

and

heater water

tap

actuators

are

identical

units,

consisting

of

a

small electric motor driving through a reduction

gear train. The shaft carrying the final gear in the

train also carries a

contact

disc which has a

portion removed; this disc conveys current to the

motor

via

any

one

of

four fixed

contacts,

when

the

circuit

is

completed

by

the

upper

or

lower

airstream switch action.

Operation

of

the motor causes the disc to

rotate

until the

gap

in the disc reaches

the

con-

tact, thus breaking the circuit.

Attached to the

end

of

each actuator gear shaft

is

a crank lever. These crank levers are connected

by

links

to

sfmilar levers fixed

to

the

water

tap

spindle

and

to

extensions

of

the

heater and

evaporator

flap spindles. The extension spindles

protrude through the actuator mounting platform,

and

flexible couplings transmit the drive, through

holes

in

the valance, to the flap spindles. Rubber

sleeves are provided under the wing to protect the

flap driving mechanism.

Page9

Air

Conditioning

System

Manual

-------

Rolls-Royce

&

Bentley

--

-----------

Fig. 5

Thermo81.ltic

swilch

The

water

tap

actuator

is

situated

low

down

at

the

forward

end

of

the

right-hand

valance

(see

Fig

. 6).

The

heater

and

evaporator

flap actuators

are

mounted

together

on

a single platform midway

along

the

valance,

adjacent

to

the

forward

brake

fluid reservoir (see Fig. 7)...

Actuators

-

to

adjust

Whenever

the

underwing

unit

or

the

wing has

been

removed,

it will be

necessary

to

check

and

possibly

adjust

the

actuator

setting. This should

be

carried

out

after

the

wing

has

been

refitted.

The

procedure

to

be

adopted

is as follows,

noting

that

instru

c

tions

2, 3

and

4

do

not

apply

if

the

wing

only

has

been

removed:-

l.

Slacken

the

four

bolts which

clamp

the

crank

levers

to

the

extension

spindles

and

gear

shafts,

also

slacken

the

two

Allen

grubscrews

securing

the

collars

to

the

extension

spindles.

2.

Remove

the

single

nut

a

nd

washer

secur-

ing

the

forward

end

of

the

mounting

plat-

form

to

the

valance

and

slacken

the

two

rear

securing

nuts.

3.

Move

the

forward

end

of

the

mounting

platform

away

from

the

valance

and

insert

the two coupling

tubes

through

the valance

Page

JO

hole

s,

locating

them

on

the

driving

dogs

on

the

flap spindles.

4.

Insert

the

extension

spindle

dogs

into

the

slots in

the

coupling

tubes

and

se

cure

the

mounting

platform

to

the

valance.

5.

Push

the

extension

spindles

fully

into

the

coupling

tubes

and

tighten

the

two

crank

lever

clamping

bolts

on

to

the

extension

spindles.

6.

Slowly

withdraw

the

extension

spindles

about

n;

in

.

and

tighten

the

Allen

grub-

screws

to

lock

the

collars

against

the

end

faces

of

the

bearing

tubes

.

7.

Detach

the

two

crank

levers

from

the

gear

shafts

and

rotate

the

extension

spindles

by

means

of

their

crank

arms

.

The

spindles

should be free to rotate

through

90°. Move-

ment

through

a

larger

angle

indicates

that

the coupling tubes are

not

engaged with

the

dogs

on

the

spindles

and

this

should

be

rectified.

8.

Ensure

that

the

upper

and

lower

airstream

sw

it

c

hes

are

in

the

OFF

position

. Switch

on

the

ignition

for

approximately

30

seconds

to

allow

the

actuator

motors

to

Fi8

, 6

Water

tap

and

actuator

------------

Rofls-Royce

&

Bentley-------

Air

Conditioning

System

Manual

rotate

to the fully closed position.

It

will

then

be

necessary

to

adjust

the

two

actuators

separately as follows: -

Evaporator

flap

actuator

I.

Rotate

the extension spindle anti-clockwise

(when viewed over the left-hand wing) until

resistance is encountered.

2.

Slightly slacken

the

crank

lever

clamping

bolt

and

rotate

the

crank

lever until

it

slopes forward

and

upward

at

45°.

3. Place

the

gear

shaft

crank

lever loosely

in

position

on

the

gear shaft.

4.

Adjust

the

position

of

the extension crank

so

that

when the gear shafi crank is rotated

clockwise

on

the

shaft,

resistance

is en-

countered

for a few degrees

to

each

side

of

the

fully

rearward

position. (This indi-

cates

that

the flap is being pressed tightly

into

its fully closed position).

Tighten

the

clamping bolt to lock

the

extension spindle

crank.

5.

Rotate

the

gear

shaft

crank

to

the

fully

rearward

end

of

its

stroke

(i.e.

when

the

gear

shaft

crank

and

the

connecting

link

are parallel) then tighten the clamping bolt.

Heater

flap

actuator

I.

Rotate

the

extension spindle clockwise

(when viewed over the left-hand wing) until

resistance is encountered.

2. Slightly slacken

the

crank

lever

clamping

bolt

and

rotate

the

crank

lever until

it

slopes 60°

forward

of

the

vertical

down

-

ward

position.

3. Place

the

gear

shaft

crank

lever loosely

in

position

on

the gear shaft.

4. Adjust

the

position

of

the

extension spindle

crank

so

that

when

the

gear

shaft

c

rank

is rotated clockwise

on

the shaft, resistance

is

encountered

for a few degrees

to

each

side

of

the

fully

rearward

position.

1

HEATER

FLAP

ACTUATOR

2

EVAPORATOR

FLAP

ACTUATOR

Fig. 7 Flap

aetuarors

Tighten

the

clamping

bolt

to

lock the

extension spindle crank.

5.

Rotate

the

gear

shaft

crank

to

the

fully

rearward

end

of

its

stroke

(i.e.

when

the

gear

shaft

crank

and

the

connecting

link

are parallel), then tighten the clamping bolt.

Operate the switches and visually check that the

actuators are

functioning

correctly.

MAGNETIC CLUTCH -

COMPRESSOR

See Page

15

for description

and

procedure.

SOLENOID VALVES

Model . . Danfoss EVJD-6 (Stamped '

F'

on the

valve body).

The

solenoid valves

control

the

flow

of

refrigerant

to

the expansion valves which serve the

two evaporator matrices.

The

lower end

of

the

movi,ng core has a rubber

insert which seats against a nozzle protruding

upwards

from

the

body

of

the

valve.

When

the

circuit is

open,

the

core

seat

is held

against

the

nozzle

by

a

spring-loaded

plunger

which is

situated in the core so as to extend from the upper

face

and

contact

the

blind

end

of

the

so

len

oid

bore (see Fig. 8).

Page

11

Air

Conditioning

System

Manual

-------

Rolls-Royce

&

Bentley-------------

·--~------

1

RE

TAINING

SCREW

2 I

DENTIFICATION

PLATE

3 SOLENOID

AND

CASING

4 VALVE CHAMBER COVER

5 SECURING SCREWS

6

MO

V

ING

CORE

7 DIAPHRAGM

AND

NOZZLE

B SEALING

RING

9 VALVE

BODY

Fig.

8 So!P.nold

valve

-

exploded

view

When

the coil is energised,

the

core

is

drawn

upwards

and

the

refrigerant

flows

through

two

small

holes

in

the

rubber

diaphragm

which

mounts

the

nozzle, leaving via the nozzle orifice.

Since the total area

of

the two inlet holes in the

diaphragm

is less

than

the

area

of

the nozzle

Page 12

orifice, the resultant pressure

drop

in the chamber

causes

the

diaphragm

to

lift

from

its seating,

allowing the refrigerant to flow

from

the annular

inlet groove,

under

the

diaphragm,

to

the

outlet

port, thus by-passing the two inlet holes

and

the

nozzle orifice and permitting full flow.

A leak

from

the

valve casing will

probably

be

due

to

inefficient sealing;

renew

the

rubber

'O'

ring between

the

valve

body

and

the valve

chambercover, refit

the

cover

and

tighten

the

six

retaining screws.

A leaking valve may be caused either by a

faulty

diaphragm

or

a

damaged

core rubber

insert.

Icing

of

the

evaporator

may

be

caused

by a

leaking valve

or

incorrect

operation

due to a

faulty

or

wrongly set thermostat.

THE REAR WINDOW DE-MISTER RELAY

In

order

to

prevent

heavy

loading

of

the

battery,

resulting

from

the

refrigeration

system

and

the

rear

window

de-·

mister

unit

working in

opposition, a relay is

incorporated

in the system

to break the circuit for the rear window

de

-mister

whenever refrigerated air is being passed into the

car, i

.e

.

upper

airstream switch -positions 2 and

3 anti-clockwise; lower

airstrcam

switch-

positions 1

and

2 anti-clockwise.

The relay

is

mo

unted

on the uppeI' right-hand

side

of

the

bulkhead

.

THE EVAPORATOR CHANGE-OVER RELAY

The

leads

from

the

number

nine

terminals

of

the

upper

and

lower

airstream

switches leave the

left-hand valance

loom

and

enter

the

WI

and

C3

terminals

of

the change-over relay mounted at the

centre

of

the

bulkhead

.

Fro

m these terminals,

leads

pass

through

the

right-hand

valance

loom

to

the

cross

duct

and

transfer

duct

thermostat

s

which

control

the so

len

o

id

valves.

From

the

C2

terminal a

lead

feeds

the

compressor

clutch

via

the rear window de-mister relay.

The

purpose

of

the change-over relay is to

provide a feed

to

the. compressor clutch from

"'

0

....

Rolls-Royce Silver Cloud II User manual

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