Dometic RM24A, RM36C, RM46, RM47, RM66 Service Manual

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Page 1

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Diagnostic Service Manuals

SERVICE

United States

SALES OFFICES

DOMETIC SALES CORP.

Zone 1 2320 Industrial Parkway

Elkhart. IN 46515

(219)

295.5226

DOMETIC

SALE S

Zone II 2920 Avenue Arlington, TX 76011 (81 7)

649.5726

DOMETIC

Zone III

14441 Bonelli St.

City of Industry, CA 91746 (818 ) 968-9431

Canada

CORP .

“E”

East

SALES CORP.

DOMETIC DISTRIBUTION INC

866 Langs Drive CambrIdge. Ontario N3H

2N7

Canada

(519 ) 653-4390

SERVICE MANUAL

REFRIGERATOR

for

recreat ional vehicles

RM24A RM36C

RM46 RM4

Edition

Publication No

4528-E/Service

May

DSC #

1973

648

When

orderi ng

MODEL. QUANTITY. PART NUMBER. DESCRIPTION

For

electric details

VOLTAGE. WATTAGE

SPARE PARTS

also:

always

state:

RM66 RM67

RM76 RM77

Page 2

Service Instructions for Domtic Absorption Refrigerators

The absorption refrigerators described in this manual are

in recreational vehicles. Since the vehicles in

camp sites

designed co operate by means of bottle propane or butane gas as electricity

These Service Instructions cover the Dometic

RM46,

Description

ECHNIGU

Cabinet es,

INSTALLATION

General

Ventilation___ Gas connections ____ ____ Electrical connections___________..______ 5

Approved installations Measurements...

FEATURES

equipment .

INSTRUCTIONS

instructions . ____ .

....

where

12/110V.

RM47, RM66, RM67,

.._ .... ..... ......... .....

...................

........... ....

____

............ ........

which

electrical power is not available,

..........

the refrigerators are

RM76,

RM77.

LIST OF CONTENTS

Pag

primarily

located

may be driven to remote

the refrigerator5 have been

Models RM24, RM36C,

Description

ELECTRIC OPERATION -

Re place ment

Wiring diagrams................................

5 5

PRESSURE

OPERATING RECOMMENDATIONS

Gas operation Electric

MAINTENANCE

Levelling

of heater_______________.__.

MEASURING

_______ _____ _______ _____

operation

_________

for installation

well as

FUNCTIONAL

DEVICES

.................

..................

PARTS

........ .......

Page

37 38 39

40 41

Cabinet

THE

GAS/ELECTRIC EQUIPMENT

Adjustments To change the door panel _ . _ ____ _____ Replacement of door gasket___.________.. 15 Replacement of evaporator door and gasket. 16 Reversing outer door__

ABSORPTION REFRIGRATOR SYSTEM

Sealed system constructions .. _ _ _ _ .

Operating analysis for cooling unit ......

Cooling unit replacement

Gas

equipment for

Dual electric equipment for

Car/electric RM46,

RM47,

OPERATION Termostat -

The gas burner ...... .

Flue system .......................

Thermo flame

equipment

RM66, RM67, RM76,

FUNCTIONAL

replacment

failure device ........ .......

.... . ...... ......

.............. ...

RM24

..... . .....

RM24 . .......

for

RM36C,

RM77... ____

PARTS

___

......

..... ..

.............. ..........

....

___

......

........

.........

20 22

Temperature Control (thermostat).... 42

The

themostat capillary

Storing food in the refrigerator_______. Cleaning _____

Ice cubes___________ ____ ______________

Travel latch ____ ____ _____

Door seal_

Odors inside the refrigerator

Odors from Flame blows out Flint lighter_______

Piezo

lighter ____________ _ ____ _________

DIAGNOSIS

Trouble

refrigerators _____ __

Trouble

refrigerators_______ .... .

Failed refrigerating unit_____..._____._

Operation analysis for electric operated

shooting - electric operated

.... .

......

___ ______ ______ ____ ___

fumes .......... .......

..... ........ .

shooting -

refrigerators

tube

..........

______

gas

......... ......

.............. .

....... .....

____ ________

...... ........ ....

...... .............

operated

. ......... ......

............. .......

42 43 43 43 43 43 44 44 44 44 45

Operation operated

Periodic

analysis for LP gas

refrigerators

maintenance

....... ...........

................ ..

Page 3

1..

TECHNICAL FEATURES

RM24

The cabinet has a so called “Full Finish Casing” built-in. RM24 is a compact refrigerator, ideal for campers, fitted with and seals.

This refrigerator is fitted with right-hand door with change over facility to hand door and exchangeable front door panel in an aluminium framed door.

Exchange can be made without the removal of the door. available operated from the rear of the cabinet. fitted as standard to assist in maintaining flame stability under adverse wind conditions.A sealing frame is fitted around the cabinet for building-in purposes,

The refrigerator has one basic casing which is Foamed in place with a lining. Insulation material polyurethane.

The construction of the door,

foamed in place with the door pan and magnetic gasket. Equipment Fool-proof electric/gas interlock system.

Flint lighting system. The electric and the gas thermostats are of the English

complete, is an aluminium extruded door frame

Thermo-electric flame failure device.

and can be used freestanding or

front

frame

left-

A full range of equipment is

A blow-out protection flue is

Ranco-make .

The

gas/e1

through the service door in the wall, when installed in a

controls are located at the rear of the refrigerator and are acccssiole

vehicle. Version Gas/110 RM36C, RM46, RM47, RM66, Cabinet Thin wall polyurethane insulation.

place insulation. Lining of vacuum-foamed

moulded SB plastic. Distinct stop for evaporator door at Cabinet shelf with hinge for big bottles, The shelves run in grooves and will not move during transport of the vehicle. Freezer compartments are, of aluminiurn sheet,except

moulded part of the lining. Accessible control panel inside the fresh food compartment.

volts A.C. and 12 volts D.C.

RM67, RM76, RI.177

RM76

and RM77 are foamed against mould.

ABS

plastic, except

All models except

RM36C,

90’

opening,

RM76

and RM77 have foamed in

which has a lining of injection

RM46, RM47, RM66

RM36C,

where it is an

and RM67

injectior

Page 4

Door

All models will be delivered with right hand door hinging, but it is possible for

the customer to change the door hinging from right to left hand.

Replacement profile of the door frame has to be removed.

Equipment All models incorporate a thermo-electric flame failure safety device and a

lighting system.

The equipment for electric and gas operation is located at the rear of the cabinet and manipulated from inside the cabinet.

The gas shut-off valve and the electric voltage-change switch are interlocked so

that both methods of operation cannot be inadvertently used at the same time. The electric and gas thermostats are of the Ranco-make. Version All models will be available with

A.C. or LP

INSTALLATION INSTRUCTIONS For LP-gas and electric operation General instructions

of door panel is possible without removing the door. Only the side

combination equipments for LP gas and 110 volts

gas/110

volts A.C. and

12 volts

in Motor Homes and Recreational Vehicles.

D.C.

piezo

The refrigerators outlined herein Refrigerators by the American Gas recreational vehicle and are approved by the Canadian Gas Association.

The certifications are, however,

accordance with the following instructions,

The installation must conform with:

In U.S.A.:

Installation of Gas Appliance and Gas Piping, 221.30

Mobile Homes

2. Recreational Vehicles A 119.2

3. accordance with the National Electrical Code ANSI CI an external alternating current electrical source is utilized.

Any applicable local code,

Canada: C S A Standard B 149.“Installation Code for Gas Burning Appliances and Equipment”

1. C S A Standard B

2. homes”

A 119.1

1969.

210.1/Z

240.4.“Gas equipped recreational vehicles and mobile

have been design certified under ANS 221.19 Association for installation in a mobile home or

contingent on the installation being made in

1964.

1970. The unit must be electrically grounded in

1968, when installed if

Page 5

Ventilation

The installation shall be made in such a manner as to separate the combustion system from the living space of the recreational vehicle. Openings for air supply or for venting of combustion products shall have a minimum dimension of not less than

l/4

inch.

Approved installation requires one lower fresh air intake and one upper exhaust vent. The accessory ventilation kits shown in these instructions have been tested

and approved for use with the refrigerator models identified. Their use is

ded, and when employed,

the ventilation kits must be installed and used without

recommen modification, An opening to the outside at floor level of the refrigerator compartment must be

provided for ventilation of heavier-than-air fuel gases, The lower vent in the Dometic kits is provided with proper size openings.

Gas connect ion Hook-up to the gas supply line is accomplished at the manual gas valve, which is

furnished with a

3/8”

(SAE)

male flare connection.

All completed connections should

be checked for leaks with soapy water.

CAUTION: When connecting the gas line to the gas valve on the

the rear of the refrigerator,

use a back-up wrench to prevent undue

gas/e1

equipment at

rotation of the gas cock,

For hook-up and servicing purpose the

lower vent is constructed as a lift out panel.

The gas supply system must incorporate a pressure regulator to maintain a supply pressure of not more nor less than 11 inches water gage.

Electrical connections

110 V A.C.

The 110 V electric cord should be plugged into an approved receptacle in the refrigerator compartment. The cord should be routed to avoid coming in contact witn

the burner cover, flue cover or other hot components. 12 V D.C.

On “Tri-Power”units there is an additional terminal block marked “12 V”. The refrigerator must be connected

to the battery circuit with two wires of adequate capacity

to avoid voltage drop.

Do not use the body or chassis as a substitute for either of these wires (possibly

only in motor homes). No other electrical equipment or lighting should be connected

to the refrigerator circuit.

When estimating length and

area of conductor cable, see table, page 6.

CAUTION : Do not operate the refrigerator on 12 Volt when the vehicle is parked. You will run

the battery dead

a rather short time.

If possible the installation of a 12 Volt operated refrigerator should be completed with a relay mounted either in the car or in the vehicle (see diagram). This relay will automatically cut out the refrigerator when the car motor is stopped.

Page 6

BREAKER

POINT

CAUTION

Do not operate therefrigerator on 12 Volt

when the vehicle is out of battery in a rather short time. If possible the installation of a 12Volt ope-

rated

refrigator should be completedwith

a relay mounted either in the car or in the

vehicle (see diagram). This tomaticallycut out the refrigeratorwhen the

car

motor is stopped.

parked.You

realy

will run

will au-

The figures below are guiding valuer calculated in consideration of

0.5

V voltage drop (about 7

without taking into account the losses at the terminals,

RELAY

----

REFR.

I--

’

Fig.

input loss) in the connection cables

AWG

14 12 10

8 6

Maximum length of two conductor cable in feet from

power supply

28 45

125 W

150 w

21 34

54 45

87 72

175 w

15 24 38 62

225

18 30 48

99 77

Maximum length of two conductor cable in meter from

power supply

175 w

9.0

13.5

22.5

2.5 4 6

1.5

150

95 w

6.0

125 W

4.5

10.5 7.5 6.5 5.5 4.0

16.5

25.0

12.5

18.5

32.0

10.5

15.5

26.5

(solid cooper wire)

275 W

24 39 62

dmm

1.628

2.052

2.588 3

.264

6.115

225 w 275 W

6.5

10.0

5.5

8.0

17.0 14.0

AWG

in mm

Area

2.082

3.307

5.260

8.367

13.299

mn2

Page 7

Special hints

The refrigerator must be installed in a stantial enclosure and

must

be level. A

sub-

spirit Level is supplied with each refrigerator and by placing it in the freezer compartment,

the refrigerator can be leveled both ways front to back and side to side. When installing the refrigerator in the enclosure,

care should be taken to ensure a complete sealing between the front frame of the refrigerator and the top, sides and

bottom of the enclosure, For this purpose a

length of sealing strip is delivered with each refrigerator. The sealing strips should

be applied to the rear surfaces of the front

frame of the refrigerator. See fig, 2.

(RM24

is supplied with this sealing already fitted on the front frame of the refrigerator).

Be careful not to damage the sealing strip applied to the bottom of the enclosure when the refrigerator is put in place.

Any space between the counter or storage

area and the top of the refrigerator must

be blocked. The heat produced at the rear of the refrigerator will otherwise become

trapped in this space making the top of the refrigerator hot and reducing the

efficiency of the refrigerator,

Fig.

Approved

installations

Approved installations require one roof vent and one lower side vent

as optional,one upper side vent and one lower side vent, as shown in

the figures 4,

Kit No. 1

and 6.

comprising:

Upper side vent

(Dometic

123)

Lower side vent (Dometic 183)

Kit No. 2

Kit No. 3

comprising:

Upper side vent Lower side vent (Dometic Roof vent

(Dometic

Lower side vent

(Dometic RM122)

RM2217)

V 2019)

(Dometic

RM2217)

Page 8

When installing the refrigerators full consideration should be taken to the sealing

instructions and the specified minimum clearances and ventilation heights tabled

below:

MINIMUM INSTALLATION CLEARANCES IN INCHES

Refrigerator model

RM66

RM76

RM67

RM77

Clearances on

sides,

bottom

top and

Figure showing location of the clearances

the

Clearance A from

the rear of storage

compartment Clearance B from

rear of condenser

Fig.

MINIMUM

Refrigerator model

KM24

VENTILATION

HEIGHT

FIGURES

Kit No, 1

9/16” RM36C RM46,

RM47 RM66, RM67 RM76, RM77

Clearance C on

top of condenser

Installation type

Kit No. 2

l/16”

5/8”

l/2”

l/4”

See minimum ventilation

height figures

Kit No. 3

29” 32” 41” 59”

PROPER VENTING IS REQUIRED TO ENSURE BEST PERFORMANCE

Kit No. 1 comprising:

Upper side vent

Lower side vent

(see Fig. 4)

RM24

(Dometic

(Dometic 183)

123)

UPPER VENT

Fig.

VENTILATIOX

Page 9

Kit No. 2 -

RM36C

comprising: Upper side vent

Lover side vent

(see Fig.

Kit No. 3

- RM36C,

(Dometic RM122) (Dometic RM2217)

RM46, RM47

RM66, RM67,

RM76, comprising:

Roof vent Lover side vent

(see Fig.

(Dometic

V 2019)

(Dometic RM2217)

Dimensions pertaining to

the installation are shown

under measurements.

RM77

LOWER VENT

OPENING

LOWER VENT

VENTILATK:\

VENTING MEANS

Fig. 1

Roof vent for Kit No. 3 Dometic

I-

V 2019

Cutout size 21”

Fig.

‘/2’

Upper side vent, Kit No. 2 Dometic RM122

Fig. 6

Fig. 9

Lover vent, Kits No, 2

and No, 3

Dometic RM2217

Page 10

MEASUREMENTS

Cabinet and recess dimensions in inches.

Cabinet

Refrigerator

models

Overall

Depth

dimens

ons

Width

Height

Door

pro-

jection

Built-in space

required

Depth

Width

RM24

RM36C RM46,

RM47

RM66, RM67

RM76,

RM77

18 217/8 24 24 7/8 24

13/16

7/8

5/8

19 20 21 21 23

l/8 l/4 9/16 9/16 7/16

22l/8 283/8 30

7/8

13/16

56l/2

Cabinet and recess dimensions in mm.

Cabinet

Refrigerator

models

RM24 RM36C RM46,

RM47 RM66,RM67 RM76,

RM77

Overall A

Depth

478

Width

486 556 513 631

547

631 547

625

595

dimen

ions

Height

562 720 785

985

1435

7/16

3/4

Door pro-

jection

37 45

45 45 45

18 20 23

l/4 l/4 l/4 l/4 5/8

19 200 217/8 21 7/8

13/16

l/4 l/4

Built-in space

OIPIh

460 515 590

489 521 555

590 555 599

605

572

729 794

994

1444

Cabinet overall dimensions

-e

Built-in space

Fig. 10 Fig. 11

requirements

, I

Page 11

Grounding

It is imperative, for personal safety, that all refrigerators equipped with a three-prong (Grounding) plug be used only with properly grounded wall receptacles, See fig. 12.

If there is any doubt as to whether the wall receptacle is properly grounded, the customer should have it checked by a qualified electrician. DO NOT, UNDER ANY CIRCUMSTANCES,

CUT OR REMOVE THE

THIRD

(GROUND) PRONG FROM

THE POWER CORD PLUG,

Proper

fusing

Fusing of any circuit should be in accordance with local electrical code, The refrigerator

should be plugged into a separate branch circuit, Use of extension cords should be

Fig.

avoided on refrigeration equipment. In the

event an extension cord is used, the cord should not exceed six feet and be of sixteen gauge or heavier wire.

Gas line L.P. gas is highly inflammable and it is of extreme importance to ensure that all

joints in piping carrying the gas from the storage bottle to the burner on the

absolutely gas tight. Check at least twice a

refrigerator are

and will

remain

year.

The gas line should be free

After installation, the gas checked for leaks up to the

of kinks and sharp ends. should be turned on and all joints in the gas line

burner using soapy water. This check should be repeated

periodically , Do not fit any extension tothe top of the flue. This is not only unnecessary, but

can create draught conditions which can adversely affect correct combustion at the burner and consequently,

the functioning of the cooling unit,

The refrigerator should be operated at an inlet gas pressure of

Incoming gas pressure is controlled by the pressure regulator on the

11” W.G. (280 IT.. W.G

propane/butane

bottle. CAUTION When connecting the gas line to the gas cock on the

gas/el

equipment

at the rear of

the refrigerator,use a back-up wrench to prevent undue rotation of the gas cock. It is of utmost importance for correct functioning of the

RM46,

RM47,

RM66, RM67 and RM76, RM77, that the gas cock lever is correctly engaged

in the slot

"E"

(see Fig,

16) on the plastic driving disc “A” of the

gas/el

control on

gas/el

control

RM36C,

mechanism.

Page 12

If for

disc,

any reason

the gas cock lever has come off position in the driving plastic

check alignment, Proceed as follows:

Turn

downwards

the driving plastic disc "A" to stop

the lever

"C"

of the gas cock as far as possible (fig, 13).

Pull the driving disc "A" outwards (fig. 14).

.3.

. .

"B"

(see fig. 13).

Fig.

Turn

the lever

Release the driving disc which is then pulled inwards by spring action, whereby the lever of the gas cock snaps into its slot

"C"

of the gas cock into vertical position

Fig.

"D"

(see fig. 15).

"E"

on the driving disc

"A"

(fig. 16).

iiote:

the

gas cock lever

disc "A",

sluggishly

adjust the two fastening screws

snaps into its position in the driving

"F"

of the mechanism.

Fig.

Page 13

Combustible Material Storage Combustible material such as ether, gasoline, hexane, naphtha, benzine, butane,

propane, alcohols,

stored in a refrigerator. These materials are classified as hazardous and constitute a dangerous application of the refrigerator.

Keeping sealed system area free of litter,

acitone,

benzol, lacquer solvent,

or natural gas SHOULD NOT BE

Litter,including paper or rags,

not be stored in the area of the absorption system behind the refrigerator. Often

rags or paper towels (etc.) will be saturated with a combustible cleaning solvent,

Such materials must not be allowed in the space behind the refrigerator

the gas flame which is operated on electricity,litter must not be stored in this area because of

heat given off by the refrigerating absorption system. It is also of utmost

importance that the air circulation round the unit’s parts behind the cabinet is unrestricted. of the refrigeration unit.

3..

UNUSED OR ABANDONED REFRIGERATORS

An unused or abandoned refrigerator or freezer in your basement or garage poses a hazard to children.

When you discard a refrigerator or freezer . . . COMPLETELY REMOVE THE DOOR. In many municipalities,

takes only a moment with a screwdriver. as you can,have the old unit carted away and destroyed before it attracts a child’s curiosity and endangers his life.

TO CHANGE THE DOOR PANELS

on models RM66,

Good refrigeration performance is dependent upon adequate ventilation

RM36C, RM46, RM47,

RM67,

RM76, RM77

used to power the refrigerator. Even when the refrigerator

woodshavings or other combustible material, should

this is the law. At any rate, it

Do this as soon as possible.

because

Also, as soon

Remove the screws holding one side member of the aluminium door frame.

Pull out the outer door panel, re-

place panel,reassemble and refit

the door,

Panel dimensions

18 RM36C 257/ RM46,RM47 2725/32'” RM66,RM67 35

RM76,RM77

RM76,RM77 41

32”

21/32"”

11/32” l/32”

253/ 32” 27

21/32”

17/32”

l/4”

15/16”

20 21 21 23 23

Width

Max.

3/16” 18l/8” 5/32” 201/32” l/2” l/2” 13/16” 233/4” 13/16” 233/4”

Min.

21 3/8" 21

3/8”

Thick-

ness Max,

l/8” 5/32” 5/

32”

5/32”

l/8” l/8”

Page 14

To change the door panel. Model RM24.

Remove the top decoration strip

with its two screws

(1).

pull outward on the top of the door panel and lift slightly

to free the panel from the

bottom groove. If a new panel is being installed,

assure

that

it is the same size as

the old panel, Install the new panel by inserting

one of the vertical sides of the

panel into the groove of the door

frame (4). Bend the panel gently so that the free

side of the panel can be slipped into

corresponding groove of the door

frame (5).

Push the panel downwards so that the

lower horizontal edge of the panel

is fitted in the bottom groove (6). Between the upper edge of the panel

and the door frame there is now a gap which should be covered by the decoration strip,

(2)

Put the strip across the door so that

the gap is covered and push it up-

wards (7). The tabs on the inside of

the strip should fit in behind the flange of the door frame.

When put in place, secure the deco-

ration strip by means of the two screws (1).

The panel is then locked

in proper position.

Page 15

REPLACEMENT OF DOOR GASKET ON

The construction of the door complete is an aluminium extruded door frame foamed in place with the door pan and magnetic door gasket, i.e. the door pan cannot be removed,

RM24

Therefore, the above model. The gasket is delivered in a set consisting of the gasket and of necessary fastening strips and

The replacement is made as follows:

Remove the door and place it with its front downwards on a soft surface.

1. Cut off the defective door sealing gasket,

possible). Drill

door pan as pattern. Fit the sealing gasket as shown in the figure 21.

Fit the door and adjust it so that it seals properly.

a special door sealing gasket for service purposes has been produced for

screws and is ordered under part No.

(Cut as near to the door pan as

7/64”

holes for the screws of the fastening strips. Use the holes of the

290 07 33-00/3.

Fig. 21

Page 16

Replacement of door gasket on models RM36C, RM46, RM47, RM66, RM67, RM76, RM77

Remove the door shelves.

1. Unscrew the upper hinge bolt, incline the door

2. outwards and lift off the door.

Lay door on flat surface with door pan facing

3. up.

CAUTION:

The

REPLACEMENT OF EVAPORATOR DOOR CASKET -

screws hidden by the door gasket. Pull the door gasket to one side and remove all screws "A"

(see fig.

REPLACEMENT OF EVAPORATOR DOOR ON

Unscrew the retainer (fig. 25) and remove the door.

Put evaporator door on a flat surface vith the sealing gasket up,

Pry the door front away from the inner pan by means of a screwdriver (fig.

Be sure to protect door panel prevent scratches and dents.

holding the door pan in place are

24)

from the door plate.

RM36C

Fig. 24

26).

Page 17

CAUTION: It is of great importance that the screwdriver is applied in front of

one of the plastic tongues which hold the inner panel and the door

front together.

Replace the sealing gasket round the inner panel and snap the inner panel and

3. the door front together.

Mount the evaporator door and refit its retainer.

Fig. 25

REPLACEMENT OF EVAPORATOR DOOR ON RM46,

Push the carrier (A) inwards by means of a blunt mandrel or pin (fig. 27) and

RM47,

RM66, RM67

remove the shutter.

Pry the spring housings

2. and turn the spring housings downwards

Mount the new shutter in close position first on one side, making sure that the cross slots engage in the cross on the hinge plate

Press the carrier on the opposite side so that the hinge plate on the shutter

4. can be pushed over it.

Turn the spring housings round and up until the small tag

fig.

27) away from the lining so that it snaps out

180’

(fig. 28).

See that the crosses engage.

fig.

27).

fig. 28) snaps

into the slot in the lining.

-’

Fig.

Page 18

REPLACEMENT OF EVAPORATOR DOOR GASKET ON RM46,

1. Remove the door as previously described.

RM47,

RM66, RM67

Unscrew

3. Put shutter on a flat surface with the sealing gasket up.

4. Pry the shutter front avay from the inner pan by means of a screwdriver (fig. 29).

CAUTION:

the one of the plastic tongues (B fig. 29) which hold the inner panel and the

shutter front together. Replace the sealing gasket round the inner

5. panel and snap the inner panel with sealing gasket into the shutter front

until the tongues snap in position.

Mount the shutter as described above,

TO CHANGE THE DOOR FROM RIGHT TO LEFT-HAND OPENING AND VICE VERSA -

the hinge plates (A fig. 29).

It is of great importance that

screwdriver

is applied in front of

RM24

With the door closed,

(a)

(b)

(c)

upper hinge arm and the four

screvs

screv

the door seal can be adjusted. Loosen the front

Fig. 30

Page 19

To change the RM36C, RM46,

Unscrew and remove upper hinge bolt (A fig.

door from

RM47,

right to left-hand opening and vice versa on models

RM66, RM67

31),

incline the door outwards and

lift off the door. (Check that washer and nylon bushings are in the right

positions).

Move the lower hinge bolt (B) to the opposite side.

Fig. 31

4’

Fig.

Remove the plastic travel latch (A fig. 32) by means ofturning it towards the

cabinet opening and slide it out from its slot in the hinge plate (B). Turn the travel latch the opposite way and fit it on the hinge plate on the other side of the cabinet. When the travel latch is in locked position the fluted side of

the latchshould face the cabinet opening.

Refit thedoor and the upper hinge bolt,

4. CAUTION

Check that the door closes easily and that the door gasket seals on all sides, If necessary,adjust by resetting the top hinge.

To change the door from right to left-hand opening and vice versa on

RM76

1. Unscrew and remove the upper hinge bolt (A)

on the freezer door,

incline the door out-

wards and lift off the door (fig. 33). Remove the middle hinge bolt (B) and lift off

---\‘-

the cabinet door.

Move the lower hinge bolt

(C)

to the opposite

E-

side.

4. Unscrew the middle hinge (D) and the holder with travel latch

(E)

and change their

positions to opposite side.

RM77

well

5. Refit the cabinet door and the middle hinge

bolt.

6. Refit the freezer door and the upper hinge bolt,

CAUTION:

Check that the door closes easily and that the door gaskets seal well on all sides.

Page 20

8..

THE ABSORPTION REFRIGERATOR SYSTEM

Sealed system construction

The sealed system of the absorption refrigerator is constructed of velded steel piping which contains the refrigerant charge. hydrogen and

water.

There are no moving

The charge consists of ammonia,

parts associated

vith the absorption system,

CAUTION:

When servicing an absorption system refrigerator, piping.

immediately with clear vater.

vessel.

Cooling Unit 257A gas/electric for model RM24

without defrosting device

Should a break occur and ammonia contact the skin, wash the affected area

Do not attempt to open the valve on the absorber

valve is covered with a plastic cap and should never be removed.

The

operation

do not puncture

Fig. 34

break the

Cooling Unit 270A

gas/electric operation for model

RM36C

vithout defrosting device

WATER SEPERATOR

Fig.

CONDENSER

EVAPORATOR

Page 21

WATER SEPERATOR

Cooling Unit gas/electrrc

315A

operation

for model RN47

with defrosting device

Cooling Unit gas/electric

317A

operation

for model RM46

without defrosting device

Cooling Unit gas/electric for model

351A

operation

RM67

with defrosting device

Fig. 36

Cooling Unit 352A gas/electric

for model

operation

RM66

without defrosting device

Cooling Unit gas/electric

513A

operation

for model RM77

with defrosting device

Cooling Unit 515A gas/electric

for model

operation

RM76

without defrosting device

Page 22

OPERATION ANALYSIS

It is obviously important that all external factors affecting the unit should be checked properly before a unit is condemned as faulty and that emphasis has been placed upon the necessity for correct installation, upright refrigerator, correct heat input, baffle position, etc.Check the size and the wattage of the electric

heater and make sure that the heater element is inserted to its full length in its

pocket. If the electric heater is only partly inserted, the heat distribution will be incorrect ,

operating on electricity, The heat input either on electric or on gas operation and also if the refrigerator had

been operating in an off-level position or with inadequate ventilation.

causing an excessive vaporizing of the ammonia within the boiler when

FOR

COOLING UNIT

same symptom can show up with too much or too little

If an excessive vaporizing of the reasons above,the liquid mixture in the boiler becomes very weak and the pump will

cease to operate, which means that the circulation of liquid stops with the result

that the evaporator inside the cabinet ceases to produce cooling, Such a blockage of the unit in the liquid circuit is most usually made evident by

signs of overheating on the vapour pipe leading from the boiler to the condenser,

the paint on this pipe being blistered and the metal becoming

To remedy this fault it is recommended to remove the unit or refrigerator complete whenever possible and to allow sufficient time to cool down the unit. Turn the unit or refrigerator upside down several times,

can be mixed with the liquid in the boiler.

balance to the unit.

The temperatures on various parts of a unit vary continuously

on thermostatic control and it is impossible given unless the refrigerator has been operating continuously on fully correct heat

input for at least 5 hours,and preferably 12 hours, prior to examination. In many cases this can be arranged by a telephone call to the customer, asking him to switch the thermostat to

operation on "MAX” the performance is satisfactory, the unit is not at fault unless

the complaint is one of varying or intermittent performance, In this connection the

room temperature at the time of the complaint must be considered, as a unit which is

satisfactory at an ambient temperature of

95’F

(+35’C).

“MAX”

on the day before the inspection call, If after 12 hours’

ammonia

within the boiler occurs due to the

discoloured.

so that the liquid in the absorber vessel

This procedure will restore the liquid

when it is operating

to base a judgment on the symptoms

65’F (+18OC)

may not be satisfactory at

In cases where satisfactory performance is obtained on settings, the thermostat is to be suspected,

“?lAX”

When a normal unit is working on

bottom than it is at the top,

pipe from the boiler to the condenser will be warm, bearably to the hand, at the bend where it joins the condenser, boiler end,

Unit filling valve The needle valve used for admitting the filling charge to a cooling unit is fitted

to the unit’s absorber vessel and is covered by an aluminium or plastic

strictly applied provision of the warranty extended on the unit to the customer,

that any interference with the filling valve

Unsatisfactory unit performance due to an ammonia leak can be determined in the

of a visible leak by traces of a yellow deposit at the point where the

escaping,

ammonia

If there is a leak on the evaporator inside the cabinet, a smell of

may be noticeable,

The absorber vessel will be warmer, The vapour cooling

the absorber coil will be warmer at the

with a gradual rise in temperature towards the

will

automatically void the warranty.

“MAX”

but not on other

cap. It is

ammonia

case

Page 23

10.

COOLING UNIT REPLACEMENT RM24

If it is necessary to replace the cooling unit, proceed as follows:

Turn off the gas b ttle.

1. Disconnect gas line to inlet valve,

CAUTION

Unplug the electric line. Check that refrigerator is empty and remove ice tray.

4. Remove the evaporator cover with its flap

5. which will release it from the evaporator. (See Fig.

Release the capillary clamp by removing the plastic rivet “B” and straighten

the thermostat capillary tubes.

Remove the plastic cover “C” by means of pulling it towards the right hand

7. side which will release it from the evaporator window.

Remove the refrigerator from its recess and place its front downwards on

soft surf ace.

Pull out the capillary tubes.

10.

Loosen mount screws “A” holding the blow out kit, Fig. 40. Remove the heater (see Fig. 13).

11. Remove mount screws “B” holding the unit.

12.

Use a back-up wrench to prevent undue rotation.

“A” by means of pulling it outwards

39).

13.

Loosen screws “D” holding the burner housing and remove the gas equipment,

14.

To replace unit, reverse

“C” holding the bracket for the

above procedure,

gas/e1

equipment and the screws

Fig. 39

Fig. 40

Page 24

COOLING UN IT REPLACEMENT Remove the refrigerator from its recess as follows:

Check that refrigerator is empty and remove

ice tray.

Turn off gas bottle.

2. Disconnect gas line to inlet valve

CAUTION: Use a backup wrench to prevent

undue rotation.

Unplug the electric line from the trailer

4. outlet.

Remove the 4 screws in rear front f fame.

5. Check for any additional screws which the

vehicle manufacturer may have used to

fasten the refrigerator in place. Carefully slide the refrigerator straight

7. out of its recess.

- RM36C, RM46, RM47, RM66, RM67

RM36c

Fig. 41

To remove the cooling unit from the cabinet, proceed as follows:

Place the refrigerator on a work bench of

1. suitable height.

Remove the thermostat capillary tubes by

2. loosening the two screws “A” on the

evaporator fins (Fig. 41 and fig. CAUTION: The locations of the thermostat

capillary tubes should be noted at this

time for relocation later on. The tubes

must be placed in the right position,

otherwise, Remove the two sealing plugs for capillary

3. tubes, cabinet,and straighten the tubes.

Remove the capillary tubes by going to the

4. back of the refrigerator and gently pulling

the tubes straight out.

Remove the 4 screws

evaporator fins

RM66,

freezer compartment).

improper performance may result.

one on the back and one inside the

“B”

and take away the

“C”.

(On RM46,

RM67,

6 screws and 2 screws in the

RM47

42).

and

RM66 RM67

Fig. 42

Remove the plastic cover “A” (Fig. 43) by

means of pulling it upwards on the right hand side which will release it from the cabinet liner (only on

RM36C).

Fig. 43

Page 25

Remove the connection block cover on the side of the boiler case and disconnect

the two electrical wires where they join the heater leads in the connection

block.

Remove the grounding screws “A” (see Fig.

46) on the lower part of the boiler

case.

Remove the flue and the flue baffle.

9. Remove the screws “B” (see Fig.

10.

46) holding the absorption unit onto the back of

the cabinet.

Release the piezo electrode.

11. Carefully slide absorption unit out of cabinet. Be careful not to damage the

12. inner liner of the cabinet,

To replace absorption unit, reverse above procedure.

13.

CAUTION :

Be sure to apply sealing permagum “A” (fig. 44 and fig. 45) on the unit mounting

1. plate and on the high evaporator inlet tube (B).

Be sure to fit insulation pad Be sure to apply proper amount of “Thermal Mastic” on the evaporator coil

(fig. 44 and fig.

When fitting the evaporator flange(s) be sure to tighten the screws properly in

45).

(C)

and sealing

(D)

(only on

RM36C).

order to obtain a perfect contact between the evaporator coil and evaporator

flange, otherwise improper cabinet performance may result.

“E”

/’

RM36C

Fig.

RM46, RM47

RM66,

Fig.

RM67

Page 26

Fig. 46

Replacement of absorption unit on models RM76,

When

replacing the absorption unit it will be necessary to remove the refrigerator

from

its recess (paragraph 10).

Remove the 6 screws at the bottom of the freezer compartment (“A” fig. 47).

Remove the thermostat capillary tubes by loosening the two screws “B” on the

RM77

evaporator fins (fig. 47). CAUTION : The locations of the thermostat capillary tubes should be noted at this time

for relocation later on.

The tubes must be replaced in the right position,

otherwise improper performance may result, Remove the two sealing plugs for capillary tubes, one on the back and one in-

3. side the cabinet,

Remove the capillary tubes by going to the back of the refrigerator and gently

and straighten the tubes out.

pulling the tubes straight out,

Page 27

Fig.

Remove the connection block cover on the side of the boiler case and disconnect

Fig.

the two electrical wires where they join the heater leads in the connection

block. Remove the grounding screw,

6. Remove the flue and the flue baffle,

Remove the screws

“B” holding the absorption unit onto the back of the

refrigerator (fig. 46).

Release the Piezo electrode from burner housing.

9. Remove the fastening screw on the burner housing and remove the

10. burner housing from the boiler case,

Carefully slide absorption unit straight out of the cabinet.

11. CAUTION

Be careful not to damage the inner liner and the locations of the fastening strips (“A” fig. 48) on the evaporator should be noted at this time as they

have to be fitted on the new unit, To replace absorption unit, reverse above procedure.

12.

CAUTION

Be sure to apply sealing permagum

(“B”

fig.

48) on the unit mounting plate.

Be sure to fit the fastening brackets (A) on the evaporator coils in the right

positions,

otherwise it will be difficult to refit the 6 fastening screws

inside the freezer.

Page 28

11.

GAS EQUIPMENT

FOR

RM24

Item

No.

3 4 5

7 8

9 10 11 12

13 14 15 16 17

‘J

1 2 3 4

Description

S.I.T.

thermo-electric flame failure device Lock nut Pressure test connection Housing for test connection Union nut Olive

Gas pipe

Burner jet

Burner pipe

Filter with nipple & nut

Thermostat

Ranco

V35 By-pass screw Thermos tat knob Screw Indicator

Thermo-coup le

Lock nut

Washer Distance tube Distance nut

Fig. 49

65 7

Item

NO.

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

39 40 41

Description

Screw Gas cock Flint lighter,

compl. Flint Spring Screw

Screw

Screw Screw

Washer Spire speed nut

Screw

Baffle

Baffle support wire

Screw Viewing Window

Seal for viewer and flint

lighter Metal shield Washer Screw

glass

Page 29

12.

DUAL ELECTRIC EQUIPMENT

12/11OV

FOR RM24

Fig.

Item Description

No.

Heater,

Terminal block Cable clamp

3 4

Thermostat knob Terminal block cover

5 6

Screw

Spire speed nut

Switch cover

Screw

Gas cock with bracket

Screw

Protection tube Thermostat

13 14

Nut

Thermostat cover

Screw

Plastic rivet

Capillary clamp

Grommet

Screw

Clip

Switch knob with dial

12/11OV, 95W,

Ranco A50

TYPE 173

/ v-12

Item

23 24 25 26 27 28 29

30 31 32 33 34 35

38 39

Description

I?i

Dial Screw

Nut

Washer Switch Cable clamp Screw

Indicator Thermostat bracket Screw

Fastening plate

Insulation

Screw

Terminal

ock

Screw

Insulation

Fuse

10A

ri.

Page 30

13.

GAS/ELECTRIC EQUIPMENT

(See Fig. 51)

GAS EQUIPMENT PARTS

Flue baffle

1. Blow out protection

Burner tube

Burner housing

Burner jet

Feeler point

Flame failure safety device

By-pass screw

Gas thermostat

Knob for fuel selector

LO.

Pressure test gage connection

11. Gas filter

12.

Plugs for capillary tubes

13. Capillary tube for gas thermostat

14.

Shut-off valve

15.

Push button for lighter

16. Piezo lighter

17. Lighter electrode

18. Knob

19.

20,

21.

for releasing safety device

Knob

for gas thermostat

Fuel selector,

LP-gas/l10 Volts A.C.

lZ/llOV

FOR

RM36C, RM46,

RM47, RM66,

RM67,

RM76,

RM77

ELECTRIC EQUIPMENT PARTS

Flexible cord with moulded plug

22. Junction box

23. Electric thermostat

24. Knob for electric thermostat

25. Toggle switch (110 Volts operation)

26. Heater

27. Capillary tube for electric thermostat

28.

12 VOLTS OPERATION

Terminal block

29.

Fuse

30. Fuel selector,

31. Change-over switch, 110 Volts

32.

LP-gas/l10 Volts

A.C./l2

A.C./12

Volts D.C.

Page 31

___[____*

. .

: :

i.:.

Fig. 51

Page 32

14.

THE GAS THERMOSTAT V- 35

The gas thermostat V-35 consists of three main parts:

sys

Be 1 lows Mechanism Valve housing, see fig. 52 and fig.

tern

BY-PASS SCREW

“COLD”

SCREW

53.

AOJUSMENT

Gas inlet

)‘alvc housmg

, Bellows system

TYPE V35

Fig. 52

Gas outlet

l_evL

Fig. 53

Mcchbnism housing

Cleaning valve or valve seat in the V-35 thermostat Dirt on the thermostat gas valve or seat prevents the thermostat valve from

pletely closing,

consequently it lets through some gas when in closed position.

car

This condition may prevent reducing the flame to the required minimum. It will cause

too low cabinet temperature. to

“0”)

If the flame does not go down to the

This can be controlled by turning the thermostat dial

low

flame (by-pass flame) it will be necessary to clean the thermostat valve and valve seat. Note: The thermostat will not close to

at least

S°C

(40 F) .

by-gass

on setting

unless the thermostat bulb is cooled down to

“O”,

Proceed as follows: a) Remove the plug,

Also check that the size of by-pass screw is in accordance with table below.

spring and valve and clean the valve and the valve seat.

Note:The adjusting screw on the thermostat is preset at the factory and should

never be readjusted,

LOST THERMOSTAT CHARGE

If the thermostat control assembly loses its charge, it will become inactive. To test for a lost charge,

control is set

at a numbered position on its dial:

from its clamp in the evaporator and warm fails to increase in sire,

while the flame is reduced to minimum and the temperature

capillar:r

the thermostat has

Remove

10s

t its charge and the themostat

thermostat capillary tube

end

with

the hand, If the flame

must be replaced.

Page 33

THERMOSTAT REPLACEMENT

To replace the thermos tat, evaporator fins, Remove the two sealing plugs,

remove capillary from its clamp on the fresh food

one on the outside and one on the inside of the cabinet. Straighten the capillary and pull it through the cabinet, Remove the thermostat by

mscrewing

it from the gas filter and the flame failure

safety device.

NOTE :

Always, shut off the gas supply before removing any gas part from the

refrigerator,

By-pass screw sizes and part No.

Mode

By-pass

Part No.

screw

RM4 RM36C

RM46

,RM47

RM66 ,RM67

RM76 ,RM77

517

s17 s17

341913-14/3 172819-02/l 172819-02/l 1728

1+02/l

172819-02/l

Fig. 54

Therm0 couple

(Feylet placed l/3”

15.

THE GAS BURNER (see fig. 55)

The burner has the jet horizontally

located and the burner mixing tube is formed as a bend with vertical outlet.

The

pri<mary

air inlets are pre-set and

therefore not adjustable. The burner and the burner holder are made in one piece.

The burner is provided with the

thenno-

electric failure safety device and the

thermocouple tip is pre-set. To check for a correct flame, set thermostat to

blue crown at the base of the

Burner jet sizes and input

Mode 1 Butane

RM24

RM36C

RM46,RM47

RM66,@167 RI176 ,RM77

24 34 43

5 1

Part

28900

200

39-lG/6 60-15/3 60-16/l’ 60-1719

60-17/9

flame.

BTU/h.

Ko. Propane

24 43 51 52 53

281) 290

200 200

200

“!AX”.

Part

Ko.

35-10/6

60-1611

60-1719

60-1817

GO-19/5

into flame)

Fig. 55

Flame should have a bright

Input BTU/h

600 1000 1100 1200 1360

Page 34

16.

TEE

FLUE SYSTEM

The flue system consists of the following parts:

1) Central tube (built-in part of the boiler system and cannot be removed)

2) Flue

3) Flue baffle with support wire

vi11

The purpose of the flue system is to provide a draft which

flame in to the central tube and supply sufficient primary the flame.

The flue baffle which is inserted in the central tube distributes the heat produced by the burner to the boiler system.

It is important that the correct size of baffle is used and that it is correctly located in the central tube in order to obtain the best cooling performance. The size and the distance between the lower end of the baffle and the lower end of the

central tube for different refrigerator models are shown in table,

pull the burner

and secondary air to

Baffle sites, height, and part No.

Part

!Jo.

Baffle Width x Length

Xodel BM24

RM36C BM46 ,RM47 BM66 ,BM67 R!!76 .RM77

Flue obstructions

On gas refrigerators, the flue will require cleaning occasionally. To do this it will be necessary to gain access to the back of the cabinet. When cleaning the flue

proceed as follows: Unscrew the outer burner shield and the burner housing, release the flue and lift

out the baffle on its support wire from the top of the boiler tube.

From the top, before putting back in place.

nun

10x100

20x100 20x100 314x4 20x100 3J4x4 20x150 314x6

clean the flue vith a suitable flue brush. Also clean the baffle,

inches

3/a

3/4

4 4

75 3 75 3 75 3 75 3 75 3

witii 29G

289 00 289 289

x) Baffle only

Baffle

support wire

82-00/2

28-00/O 28-00/O

28-00/O

74-0015

Fig. 51

An obstruction in the flue will reduce or stop flue draft. Flue obstructions will

cause odors outside refrigerator, slow freezing and higher cabinet temperatures.

Flue stoppages may also cause the flame to burn outside the central tube,

Page 35

THERMOELECTRIC FL&!! FAILURE SAFETY DEVICE (see fig, 58)

17.

All

models equipped with an automatic failure device.

All

gas operated or combined gas/electric refrigerator models dealt with in this

service instruction are equipped with an automatic failure device.

The

purpose of incorporating an automatic flame failure device in the burner assem-

bly is to prevent unburned gas to escape from the burner and to avoid a fire hazard,

if, for some reason or other, the flame has been extinguished or blown out,

The safety device consists of the following parts:

‘1

Fig. 58

Spring loaded push button

Gas valve

2. Housing

Sensing clement with the hot junction of the

thermocoup le (Feeler)

Enamel insulated copper thread Electromagnet

6. Outer tube

7. Armature

8. Spring

The

chttimoelectric

By pressing the push button (1) the gas valve (2) is opened and the gas can pass

housing (3) on to the

flame of the burner is lit, junction of the thermocouple is thus heated and an electric current is generated. This current passes through the copper wire (5) to the electromagnet (6) and back

through the outer tube (7). As soon as the electric current is generated, the electromagnet attracts the armature (8) with the valve be released,

As long as current is flowing, the valOo burner.

When the flame is extinguished, the heat transfer to the hot junction is and no electric current is generated.

forced back by the spring (9) and the gas flow through the valve (2) is closed.

Important:

When

held in that position about 10 seconds,

the burner properly,

safety device functions as follows:

burr.:r,

lighting the burner the push button (1) should be pressed f

At the burner the feeler (4) is located. When the gas

some heat is transferred to the feeler

(2).

The push button can

is.

kept open and allows gas to pass co

The

armature (8) with the valve (2) is

otherwise the gas may not get

(4).

The hot

interruFced

tllen

irrl:r 2r.l

c’e

c’en

:‘-e

Page 36

REPLACEMENT ELEMENT OF THE THERMOELECTRIC

FLAME

How

devxce

3. Screw off nut C, remove spacer G and nut D. Release the thcrmo-element E from

4. Bend carefully the new thermo-element to the same shape as the old one. Screw

FAILURE SAFETY

replace the thermo-element of the thermoelectric flame failure safety

(see fig. 59).

l;nscrew plug A f

Loosen the position nut C and lock nut D.

burner housing F.

nut D into the new element, Put the feeler through the hole in the burner housing F, refit the spacer C and

screw the position nut C tight against the shoulder on the feeler, raking sure

the nut D is free during this operation,

TXE THEM-

DEVICt;

ram

the valve housing B.

Fig. 59

Tighten the lock nut D against the burner housing with a small wrench, if necessary holding nut C vith another wrench,

as in figure.

7, Check that no burrs are inside valve housing B which

Screw plug A onto the valve housing B, hole in the aluminium cap of the housing, the valve housing to ensure contact betveen the thermo-element and the coil vithin the housing,

REPLACEHINT

If the safety valve magnet is defective,

When the safety valve magnet needs replacement

Unscrew the connection plug (A) on the thermocouple from the housing nut

Unscrew the housing nut (B) and remove the defective safety valve from the housing

Fit a new magnet valve and ensure

that it is properly inserted in the housing (D).

Fit the housing nut

connection plug (A) and check that a good contact between the contact

plug (E) on the thermocouple and

the contact (F) on the safety

valve magnet is obtained.

THE

SAFETY VALVE

(3).

(B)

MACXET

and the

taking care not to damage the threaded

it cannot be repaired but

Make sure the feeler is located

nay

cause leaks,

Plug A must be properly tightened to

u.ust

proceed as follows (see fig,

magnetic

be replaced,

60). (B).

ragnet

(C)

Page 37

REPLACEMENT

18.

HEATER

The electric heater is positioned in a pocket which is welded to the boiler tube, A wire clip holds the heater securely in the pocket (see fig. 61).

Wire clip

Fig.

RM36C, RH66, RM67

RM46

RM24, RM76, RM77

Fig. 62

Fig. 63

To replace the heater, first check that the wall plug is disconnected, then unscrew

lock screws

and the upper lid C upwards (on

A (Fig. 62) on the Lower lid B and upper lid C. Push the lid B downwards

RM24

and

RH76,

RM77 remove the plate D, Fig. 63).

On the RM24 model it will also be necessary to remove the blow-out protection flue, Remove the fibre glass insulation around the heater so that the heater is accessible

for removal. Then bend aside the wire clip keeping the heater in proper position,

disconnect the heater leads from the cord and iemove the heater.

Make sure the new heater is fully inserted before bending back the wire clip (with

caution,or it might snap off), Reset the electric connections. Be careful to put

the Pibre glass insulation back in its proper place and in such a way that the heater leads will not be in direct contact with hot boiler tubes.

It is essential that the remplacement heater be of the proper rating in order to

provide the correct heat input for the particular model. The table below shows the correct heater for each model:

Model

RM24 RM36C

RM36C RM46 ,RM47 RM46

,RM47

RM66

,RM67

RM66

,RM67

RM76

,RM77

Prod. No. 926 39 02

926 45 03 926 45 04 926 46 03 926 46 04 926 47 03 926 47 04

926 48 03

Voltage

12/110

110

12/110

110

12/110

110

12/110

110

810.85

1.1

g/1.1

1.2

10/1.2

1.4

11/1.4

2.1

Watts

95 125 125 135 135

150

~ 225

Part No.

290

117

u,v-tiu,/3

173711-01/l 173707-00/l

1737

12-01/g

173708-00/S 1737 1737

13-0117

OS-0017

173074-01/4

Page 38

19.

WIRING DIAGRAMS

for

RM24

Switch

1lOV

for RM36C, RM46, RM47 RM66,

RM67, RM76,RM77

Thermostat

Rrd

Black

Terminal

hlnrk

“.__..

Black

Brown

P-.4

Terminal

block

Fig.

Volts

110 Volts

Heating element

l2V/llOV

I I

‘LP Gos

;

OFF

for

RM36C,

Switch

RM46, RM47,

IlOV

WIRING

DIAGRAM

12DChlOAC

Thermostat

RM66,

RM67

Terminal block

Fig. 6.5

Fig.

Heater

Page 39

20.

PRESSURE

XEASURING

DEVICES

The pressure at the burner should be checked at the time the refrigerator is started up, After connecting the pressure gauge, set the thermostat dial at

the gas at the union cock and light tile burner. At the

reading should be

11”

(280 mm).

The L.P. gas is supplied directly to the thermostat

“:Xx”

setting the pressure

from the regulator fitted on the gas bottle at pressure of 11” (280

"i.'ky".

nn).

Turn on

Water U gauge (fig, 67)

The water gauge consists of a glass U tube filled to pressure is exerted on one side of the gauge, the water on

rrid-point

tha-t

with water.

Khen Eas

side is forced down

and there is a corresponding rise of water on the other side.

Water column pressure per square inch is indicated by the difference of the two

columns of water measured in inches.

A convenient scale reading in inches and tenths of an inch is

rounted

bctveen the

two columns.

When reading the gauge proceed as follows

If the gauge is filled with water to zero and the lower column is 5.5 inches (140

mm)

below zero, the other column will also be 5.5 inches (140

the tvo together 5.5 + 5.5

11 inches (280 mm) water column,

IX).

By adding

For accuracy of measurement a vater L’ gauge is far superior to a low pressure gauge.

If a low pressure gauge is used,

it should be checked for accuracy against a water

gauge occasionally .

LOW PRESSURE GAUGE

Adopter

WATER U

GAUGE

IF--

Part No.

33 87

Fig.

2.9~GOI4

Low pressure gauge (Fischer) (fig, 64) This gauge is calibrated to read in

“inches of water column pressure”. It is a

standard manometer reading and is colored red. How to use the pressure gauge

When testing the pressure at the burner,

fig. 67 and fit the hose from the pressure gauge. Use adapter, part

remove the plug indicated with an arrow in

Ko,

33 87 59-031

It is very important that the gas operated refrigerators operate at correct pressure

at the pressure stipulated for the refrigerator.

i.e.

OPERATING

21.

RECOWENDATIONS

Experience over many years shows that incorrect installation and adjustments are major causes for unsatisfactory refrigeration.

Page 40

Unsatisfactory refrigeration also results from improper operation by the user due

to misunderstanding or carelessness. “INSTRUCTIONS FOR USE” which should be followed to assure the best refrigeration results. The servicer, as well as the user, the contents.

A study of the following instructions will help the servicer to better instruct the user,

22.

The gas and electric controls are located at the rear of the refrigerator and are

accessible through the service door in the wall of the vehicle. The gas shut-off valve and the electric voltage-change switch are interlocked so that both methods of operation cannot be inadvertently used at the same time.

23.

and will also help him to answer questions which may be asked.

STARTING THE REFRIGERATOR

GAS OPERATION (See Fig, 70 and

RM24

Each refrigerator contains a pamphlet called

should become thoroughly acquainted with

71)

Ensure that the voltage change switch

1. Turn the gas valve (C) so that the handle is in line with the valve body and

2. turn the gas thermostat dial (B) to No. 4 setting.

Push in the blue button

3. clear air from pipe line.

Still pressing in the button

4. sharply in a clockwise direction.

Continue pressing in the blue button

it and check that the burner is alight by looking at the flame through the opening (F) .

If the burner has not lit,

the thermostat dial (B) must first be turned to MAX and returned to its

normal setting only after the burner is alight.

(D)

of the flame failure device for S-10 seconds to

CD),

(A)

is at the “OFF” position.

twist the knob of the flint lighter

(D)

for another 5 seconds, then release

(C)

CONN

24.

ELECTRIC OPERATION (See Fig,

The RM24 refrigerator can be operated on 12 volts D.C. or

the voltage change switch (A) is set at the appropriate position.

70)

110

volts

A.C.,

provided

Page 41

Turn off the gas valve (C), its handle

1. of the cabinet.

Turn the voltage change switch (A) to the required setting, then connect the

refrigerator to t’ When the electrical supply cord is connected to a 110 volt A.C. supply, tne

voltage on the switch (A) should show voltage on the switch (A) should show

Turn the electric thermostat knob (E) to No. 4.

3. HOW TO START THE REFRIGERATOR

RM36C, RM46,

25.

GAS OPERATION (Fig. 72)

26.

To start the refrigerator turn the knob A to position “Casl(.

now opened and the electric circuits are disconnected. Turn the gas thermostat knob C to setting 4.

2. Pull the knob D of the flame failure safety device and after 5-10 seconds press

3. the button E to the piezo lighter. the reflector F it can be observed that the burner is lit.

RM47 p

appropriate voltage supply,

RM66,

RM67,

RM76, RM77

vi11

then be pointing avay from the back

llOV,

12V.

The pressing may have to be repeated. Through

when connected to the

battery,

Tne

gas valve is

the

After the burner has been lit keep the knob D in pulled out position for another

4. 5 seconds. Then release the knob and check through the reflector that the burner stays lit,

Note: After a replacement of the gas container or

gas pipes are likely to be filled with air,

procedure has to be repeated until the air is pushed out of the pipes and

the gas has reached the burner.

a,long

In such a case the lighting

shut-off period the

27.

ELECTRIC OPERATION (Fig, 72)

Check that the attachment plug of the flexible cord is

1. the main supply. The 12 volt connection is made at the rear of the refrigerator.

Turn the knob A to “off” position, then press the knob

2. desired electric position.

correctly connected co marked terminals at the

in to bottom and turn to

Page 42

3. Turn the thermostat knob G to setting 4.

Kate:

When the refrigerator is equipped for 110 volts and 12 volt operation the

turning movement of the knob A should be made as follows:

In gas OFF position the knob is pressed and turned clockwise to the

12 volt position, If 110 volt operation is desired press once more and

continue the clockwise turning to the 110 volt position marked

28.

LEVELING

“ELEC”.

In the boiler of the cooling unit,

mixture and carried to the finned condenser where it liquefies. The liquid f

the evaporator inside the cabinet where it creates cold by evaporating into a circulating flow of hydrogen gas. accumulates forming pockets pletely,

When the vehicle is stationary it must be leveled to be comfortable to live in. If

the refrigerator is properly installed, i.e. parallel with the floor, bubble level (see Fig. 73) is supplied with the refrigerator, The level should be placed on the ice-tray compartment shelf and the position of the bubble observed (if necessary, with the aid of a small mirror), Adjust the position of the vehicle so that the bubble is in the center ring of the level.

When the vehicle is on tow,

affect the refrigerator as long as the movement passes either side of level but

when the vehicle is temporarily parked,

be remembered,

29.

in which case, of course, cooling will

TEMPERATURE COh’TROL (TREKfOSTAT)

When the temperature control (thermostat) is set at a higher number, refrige-

rating effect will be increased, freezing compartment and in the food storage compartment.

vhich

the refrigerator will operate properly, To check this, a

the continuous rolling and pitching movement

ammonia vapor is distilled from an ammonia-water

lO’.JS

If the evaporator is not level the liquid readily

can impair the gas circulation or block it com-

stoe.

the ice-tray compartment shelf is

Fig.

7.7

vi11

not

the sensitivity of the refrigerator should

This

vi11

tend to lover the temperature in the

k%en

the temperature control is set at a lower number, refrigerating effect will

be reduced.

When

the temperature control is set at mid-dial position, medium refrigerating

effect will be produced.

2. The position of the temperature control should depend upon the refrigerator load.

number .A higher setting of the temperature control will be required in summer

than in winter.

The setting of the temperature control determines the action of the thermostat in relation to freezing compartment temperatures,

30.

THE

On the fresh food evaporator is a sleeve in which the end

of the thermosta: capillary tubing must be inserted. Check that the capillary tube is firmly in place, If the capillary tube is not properly inserted in its sleeve

the

burner will operate continuously at maximum flame.

It will cause too low cabinet temperatures.

When

the food load is heavy,

THERTIOSTAT

CAPILWRY TUBE

turn the temperature control to a higher

(see

Fig.

74).

/ 4 ’

Fig. ;A

Page 43

31.

STORING FOOD IN THE

REFRXGERATOR

Proper refrigeration requires

1. partment. Restricted air circulation within the food storage compartment will cause higher cabinet temperatures, Rearrange foods.

It is also essential that the shelves are not covered with paper or large

2. storage containers.

Odorous foods or highly flavored foods should always be stored in covered

dishes, plastic bags or wrapped in foil or wax paper, to prevent food odors. Vegetables, lettuce, etc.,

put hot food into the refrigerator.

To reduce frost formation in and on the freezing compartment, cover stored

liquids and moist foods and do not leave the door open longer than necessary,

When the refrigerator is heavily loaded,

5. peratures to lower, also increasing the ice making time. A very heavy load may also cause defrosting.

The cabinet interior should be cleaned regularly. Remove the shelves and wash the

lining with lukewarm water to which a little baking soda may be added. Dry

thoroughly,

be used to wash the cooling evaporator,

especially around door frames and door gasket,

free air circulation within the food storage

should be covered to retain their crispness, Xever

it takes longer for refrigerator

Warm

water only should

ice-tra:rs

and shelves.

coar

telh-

Plastic dishes may be washed in warm soapy water

the hand. Do not expose them to dry heat, (Never use strong chemicals or abrasive cleaning materials on any part of the cabinet).

33.

ICE

CLiES

Do not use warm

1. Faster freezing

34.

TRAVEL

The travel latch may be fitted to hold the door closed while in transit.

35.

TO SHUT OFF THE CABINET

If for any reason refrigeration is not required over a period of weeks, the gas taps or electric switch should be turned off,

The cabinet and ice trays should be emptied,

ajar,

36.

DOOR SEAL

It is essential, for correct operation, that the door gasket makes a good seal

all around, against the front of the cabinet.

LATCti

water, as it takes longer to freeze. will result if

precooled

water is used.

not hotter than is bearable to

cleaned

and dried and the door left

The compression of the gasket down the hinge side must not be too great: The gasket should just contact the front of the cabinet when the door is closed. This is normally allowed for during manufacturing,

Page 44

Failure of the door gasket to contact the front of the cabinet can be determined visually when the door is closed. seal, board feel loose.

Improper door sealing on cabinets can be corrected by slackening the upper and

lower hinge fixing screws and moving the door inwards or outwards as required until a satisfactory seal is obtained.

If a good seal cannot be obtained, a new gasket should be installed. It is also essential to check that the cabinet opening through which the freez-

ing compartment enters the cabinet should be properly sealed by sealing compound, If this seal leaks, warm air enters the cabinet causing high cabinet temperatures and

37.

ODORS

Odors inside the refrigerator are caused by improper food storage.

inserted between the seal and the cabinet front, Nowhere should the card-

excesskve

INSIDE THE REFRIGERATOR

frost formation on the freezing compartment.

Run a piece of thin cardboard along tne door

They may also be caused by too infrequent cleaning of the food compartment or the

refrigerator has been shut off for some time with the door closed.

ODORS FROM FUMES

38.

Odors outside the refrigerator may be caused by gas leaks.

1. gas appliances are closed, Test gas connections and all joints in the gas line

with soap and water solution,

leak with an open flame. Use a flashlight when

bubbles caused by leaks. The gas line should be free of kinks and sharp ends. Turn on gas cock, light burner and test connections between the gas cock and

the burner carefully with soap and water.

Odors outside the refrigerator may be caused by improper burner flame.

2. The flame touches side of the boiler due to dislocation of the burner. Relocate.

Burner dislocation may also cause smoke and Burner damaged. Replace.

4. The flame touches flue baffle. Correct position of baffle.

The flue tube is dirty, Clean the flue,

FLAME

39.

If trouble is encountered with the flame blowing out under specially windy conditions, try to place the vehicle so that the wind does not blow directly into the

vent outlets.

measure can of course only be temporary such as when the vehicle is on tow, for

after several hours at this setting the foodstuffs in the cabinet may become too

BLOWS OUT

If the trouble persists, set the thermostat on

up to and including gas cock. Never look for a

necessary in looking for soap

discolouring

of walls and ceiling.

Xake

sure that all

"XAX".

This latter

cold,

40.

THE FLINT LIGHTER

RM24

If after some time of use the sparks from the lighter weaken, the flint will

probably have to be replaced.

Page 45

/ i.

&l,/

,,,

,.,’

/’

Fig.

To replace flint, follov these steps:

Remove the

outer burner shield by means of loosening the

’

&!I!

Fig. 76

two

screws A (Fig. 75).

Remove the

2. Remove cap

3. and fit a nev

Be sure not to lose the small helical spring vhich presses the flint against

the serrated wheel.

Replacement of the serrated vheel - RM24

If after several years of use the lighter does not function properly even

new flint,the serrated vheel might be worn out and needs to be replaced.

Release the lighter as described above.

Unscrew the rod from the serrated wheel and fit a new wheel.

CAUTION

lighter by loosening the screw B retaining the lighter (Fig,

C and

The rod has to be unscrewed anti-clockwise.

flxnt.

remOve

the spring D and tap out any remaining piece of flint

76).

with

Fig. 77

41.

PIEZO LIGHTER (Fig. 77)

The

RM36C,

crystal lighting device vhich creates a spark over the burner when the button E is

pushed in fully (see fig. 72).

RM46, RM47,

RM66,

RM67,

RM76

and RM77 models are equipped with a Piero

Page 46

The Piezo lighter does not normally need any maintenance.

If by any reason the electrode or the lighter must be replaced, proceed as follows: Replacement of electrode only.

Unscrew burner outer shield.

Loosen fastening screw “A” (Fig. 78) holding the electrode against side of

2. burner housing.

Loosen the electrode from its cable by unscrewing the electrode anti-clockwise.

3. Pit a new electrode,

4. CAUTION

Replacement of Piezo lighter complete

Release the Piezo lighter knob

1. pulling the knob outwards.

Loosen outer burner shield and burner housing.

2. Loosen the fastening screw “A” (Fig. 78) holding

3. burner housing.

Loosen the two screws

4. pulled out at the rear of the cabinet.

To fit new lighter, reverse above procedure.

When fastening the electrode on the burner housing make sure that the

insulation plate is properly fitted between the burner housing and the electrode (see fig. 78).

“E”

(see fig. 72)

“B”

on holder

“C”.

Now the

inside the cabinet by means of

the electrode against side of

lighter complete can be

Fig.

Electrode

Page 47

TROUBLE SHOOTING

42.

Cause The refrigerator r’aes not cool satisfactorily Thennoatat at wrong setting.

Air circulation over cooling unit

restricted. Refrigerator not level.

Air leakage into cabinet.

Evaporator heavily coated with

frost. Heater faulty,

type.

ELECTRIC OPERATED REFRIGERATORS

wrong voltage or Use a new heater of appropriate voltage

Remedy

Turn the thermostat dial to a higher number, Remove any restriction,

The refrigerator must be level in both direc-

tions to operate properly. If in a trailer, always make sure it is level when parked, See par. 28.

Check fit of door gasket, and that the seal-

ing plug is in the hole for the thermostat

capillary in the rear wall of cabinet. See par, 36.

Defrost at more frequent intervals,

(see table page

37).

Intermittent electricity supply.

Drop in supply voltage. The supply voltage should be maintained at

Thermostat at too low setting.

Break in electrical circuit,

Heater faulty (open circuit). Thermostat faulty. Failed cooling unit. The refrigerator is too cold

Thermostat at wrong setting.

End of thermostat capillary tube

incorrectly located.

Thermostat faulty.

Look for loose connections or other reason

for interruption and correct,

the full rate, Turn thermostat dial to higher number.

Check fuses, switches, wiring, etc., and

repair the fault,

Replace with a new heater (see table page

Fit a new thermostat.

See par, 44.

Turn the thermostat dial to a lower number,

Re-insert the capillary end of thermostat fully in the sleeve under the ice-tray compartment. See par, 30.

Have new thermostat fitted.

37).

Heater wrongly connected to

terminal block.

See wiring diagrams par. 19.

Page 48

43.

TROUBLE SHOOTING

GAS OPERATED REFRIGERATORS

Cause

The refrigerator does not cool satisfactorily

Air circulation over cooling unit

restricted. Refrigerator not level.

Gas in bottle used

Feeler point of the flame failure

device not heated enough by

flame.

Clogged by-pass screw.

Burner jet or burner head

clogged.

Flue baffle not inserted into

central tube of the cooling unit.

up.

Remedy

Remove any restriction,

See par. 28. Fit new bottle.

Adjust position of feeler point in flame

See par, 15,

Clean by-pass screw with alcohol and by

blowing through with air. If necessary,

replace by-pass screw. Clean burner jet with alcohol and by

blowing through with air, If necessary,

replace burner jet, Clean the head with a brush.

Position of baffle (see table

on page

34).

Baffle too low in flue.

Wrong gas pressure at the burner.

Burner assembly may be adrift.

Thermostat at wrong setting.

Failed cooling unit.

The refrigerator is too cold Thermostat at wrong setting.

End of thermoatat capillary tube

incorrectly located,

Incorrect size of by-pass screw.

Dirt in valve of the thermostat.

Position of baffle (see table on page 34).

Have pressure checked. Pressure must not

fall below 11” (280 mm) water columns

when thermostat is set on max.

Refit burner. Turn the thermostat dial to a higher number,

If necessary,replace thermostat.

See par, 44,

Turn the thermostat dial Re-insert end of capillary tube in the clamp

on the fresh food compartment. See par. 30.

Replace by-pass screw to

(see table page 33).

Clean the valve and valve seat in the

thermostat (see par. 14).

to a lower number.

correct size

Page 49

FAILED

44.

There are many things to consider before determining that the unit is faulty.

Leveling of the refrigerator

1. Ventilation

2. Cleaning

Cleaning

4. Cleaning

5. Proper gas pressure

6. Correct flame

7. Correct position of baffle in boiler tube

8. No burnt-out heating element

9. Heating element in correct position

10. Correct size and vattage of heating element

11.

REFRIGERATING

and proper size of burner orifice and proper size of by-pass screw of thermos tat valve

UNIT

Supply voltage corresponds to voltage stamped on heating element

12. No fluctuation in voltage supply

13. No loose electric connections

14. Thermostat intact

15. No unit leaks

16. Safety valve intact

17.

45.

PACKING OF DEFECTIVE

Particular attention must be paid to the packing of a replaced defective unit to ensure during its return to the distributor that it will not be damaged in transit.

When the replacement unit is supplied cased, manner in which it is packed,

use of wood bracing and cardboard pads, into the case.

Structural distortion, particularly with the smaller units not having an angle iron f

rame,

internal braces are not in position.

can easily occur if the case containing the unit is roughly handled and if

UNITS

to ensure

careful note should be taken of the

that the form of packing adopted, i.e. the

is used when the defective unit is packed

Page 50

46.

OPERATION ANALYSIS FOR REFRIGERATORS OPERATING ON ELECTRICITY

SYMPTOM

2 s

g g

2 4 $ 2 .; 2

b u:

2; u

-4 o

&J b

2 8d

z .r(

.r(

; .I

u !.I

See paragraph No.

CAUSE

Note: It

that several causes can be responsible for

the one effect. The real cause or causes

should bc determined by a process of

nation, investigating each possible cause,

starting at the top of the tabulation and

proceeding to the bottan.

will

be noted in this tabulation

elipi-

Page 51

The correct flame, at should have a bright base of the flame. See Fig. 79.

OPERATION ANALYSIS FOR LP

SYWTOH

0”

b!z

“MAX”

setting.,

bl:d

crovn at the

t--L;“;--

XI 16 Insufficientprimary air

See

paragraph No.

16 38

GAS REPRICEltATORS

Note: It will be noted in this tabulation that several the one effect. The real cause or causes should be determined by a process of elimination, proceeding to the bottom.

Gas leaks

No adequate ventilation

Refrigerating unit not level

Jet orifice clogged

The thermocouple tip not in position No contact between

valve Faulty safety valve magnet Improper By-passflame too small Gauze in burner head clogged Dirt in thermostat or valve seat

Bv-Dass

Improper position of the flue baffle Unstable burner f lams

Improper food storage

The

thermostatincorrectly used

Improperstorage ofliquid and moist foods Leaky cabinet seals Obstructed flue Flame contacts central tube

Infrequentcleaning of food

Refrigerator shut off vith

Unvrapped odorous food

Incomplete contact of

Lost thermostat charge

Failed refrigerating unit

Room

temperature too low

CAUSE

causes

can be

investigating each possible cause,

mamet

maxisum

flametoo

thenwcouple

flame

lame

responrible

compartment

close’d

thermstat

and safety

door

capillary tub

for

‘1

Page 52

48.

PERIODIC MAINTENANCE

Once or twice a year depending on use, it is recommended burner assembly, Proceed as follows:

Disconnect the gas pipe from the burner assembly,

Bemove

Remove the jet,

Clean the jet with alcohol and compressed air ONLY.

4. Clean the burner tube and especially the gauze with a brush. Blow with

5. compressed air,

At the same time, Heavy soot formation indicates improper functioning of the burner. Clean baffle and flue. Further,

Reassemble.

7. The entire gas installation should be checked for leaks at intervals. Test all

8. pipe connections with soapy water, not with an open flame.

Check the burner with full flame (MAX) and with by-pass flame (0).

9. Note: The thermostat will not close to by-pass

refrigerator has been working for a few hours and the

down to at least

the burner housing.

check the flue baffle: that it is clean and free from soot.

clean cooling unit and floor under refrigerator.

on-

6”‘(lo°F).

to clean and ad just the

setting

“0”

unless the

thermostat bulb

cooled

Dometic RM24A, RM36C, RM46, RM47, RM66 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual