Dometic RM24A, RM36C, RM46, RM47, RM66 Service Manual
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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
c
REFRIGERATOR
for
recreat ional vehicles
RM24A RM36C
RM46 RM4
7
Edition
Publication No
4528-E/Service
May
DSC #
1
1973
648
When
orderi ng
MODEL. QUANTITY. PART NUMBER. DESCRIPTION
For
electric details
VOLTAGE. WATTAGE
SPARE PARTS
also:
always
state:
RM66 RM67
1
RM76 RM77
1
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
3
10
primarily
located
may be driven to remote
the refrigerator5 have been
Models RM24, RM36C,
Description
ELECTRIC OPERATION -
Re place ment
Wiring diagrams................................
4
5
5
7
PRESSURE
OPERATING RECOMMENDATIONS
Gas operation
Electric
MAINTENANCE
Levelling
of heater_______________.__.
MEASURING
_______ _____ _______ _____
operation
_________
for installation
well as
by
FUNCTIONAL
DEVICES
.................
..................
PARTS
........ .......
Page
37
38
39
40
41
42
Cabinet
THE
GAS/ELECTRIC EQUIPMENT
AS
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
___
......
.
..... ..
.............. ..........
....
___
......
........
32
.........
20
22
23
29
30
33
34
13
18
28
35
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
47
48
49
50
Operation
operated
Periodic
analysis for LP gas
refrigerators
maintenance
....... ...........
................ ..
51
52
1..
TECHNICAL FEATURES
RM24
3
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
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
2.
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
1.
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,
4.
In
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
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.
5
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
in
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.
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,
I
<-
r
I
I
1
I
I
I
RELAY
----
1
I
>
-
I
REFR.
I
I
I
I--
’
z
Fig.
1
%
input loss) in the connection cables
AWG
14
12
10
8
6
Maximum length of two conductor cable in feet from
power supply
95
w
28
45
72
125 W
150 w
21
34
54 45
87 72
17
28
175 w
15
24
38
62
225
11
18
30
48
W
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
10
1.5
150
95 w
6.0
125 W
4.5
w
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
Special hints
7
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,
r
Fig.
2
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
5
and 6.
comprising:
Upper side vent
(Dometic
123)
Lower side vent (Dometic 183)
Kit No. 2
Kit No. 3
comprising:
comprising:
Upper side vent
Lower side vent (Dometic
Roof vent
(Dometic
Lower side vent
(Dometic RM122)
RM2217)
V 2019)
(Dometic
RM2217)
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.
3
MINIMUM
Refrigerator
model
KM24
VENTILATION
HEIGHT
FIGURES
Kit No, 1
22
9/16”
RM36C
RM46,
RM47
RM66, RM67
RM76, RM77
Clearance C on
top of
condenser
Installation type
Kit No. 2
37
l/16”
39
5/8”
47
l/2”
70
l/4”
1
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
I
I
Fig.
/
VENTILATIOX
/
4
9
Kit No. 2 -
RM36C
comprising:
Upper side vent
Lover side vent
(see Fig.
Kit No. 3
5)
- RM36C,
(Dometic RM122)
(Dometic RM2217)
RM46, RM47
RM66, RM67,
RM76,
comprising:
Roof vent
Lover side vent
(see Fig.
(Dometic
V 2019)
(Dometic RM2217)
6)
Dimensions pertaining to
the installation are shown
under measurements.
RM77
LOWER VENT
OPENING
LOWER VENT
-
I
VENTILATK:\
VENTING MEANS
Fig. 1
Roof vent for Kit No. 3
Dometic
I-
c-
V 2019
Cutout size 21”
23
Fig.
‘/2’
8
Upper side vent, Kit No. 2
Dometic RM122
Fig. 6
1
Fig. 9
Lover vent, Kits No, 2
\
and No, 3
Dometic RM2217
10
MEASUREMENTS
Cabinet and recess dimensions in inches.
r
Cabinet
Refrigerator
models
Overall
A
Depth
dimens
ons
B
Width
C
Height
Door
pro-
jection
Built-in space
required
D
Depth
Width
E
RM24
RM36C
RM46,
RM47
RM66, RM67
RM76,
RM77
18
217/8
24
24 7/8
24
ii
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
38
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
B
ions
C
Height
562
720
785
985
1435
1
7/16
1
3/4
1
3/4
1
3/4
1
3/4
Door
pro-
jection
37
45
45
45
45
18
20
23
23
23
l/4
l/4
l/4
l/4
5/8
19
200
217/8
21 7/8
23
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
C
Fig. 10 Fig. 11
requirements
,
I
0
I
I
F
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,
11
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
12
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.
12
If for
disc,
1.
2.
3.
any reason
the gas cock lever has come off position in the driving plastic
check alignment, Proceed as follows:
Turn
Turn
downwards
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.
WI
. .
"B"
(see fig. 13).
Fig.
13
Turn
4.
3.
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.
14
"D"
(see fig. 15).
"E"
on the driving disc
"A"
(fig. 16).
iiote:
If
the
gas cock lever
disc "A",
sluggishly
adjust the two fastening screws
snaps into its position in the driving
"F"
of the mechanism.
Fig.
Fig.
15
16
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
13
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.
4.
TO CHANGE THE DOOR PANELS
on models
RM66,
Good refrigeration performance is dependent upon adequate ventilation
RM36C, RM46, RM47,
RM67,
RM76, RM77
is
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
of
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
11
32”
21/32"”
11/32”
l/32”
253/ 32”
27
21/32”
35
17/32”
11
l/4”
40
15/16”
i
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”
14
To change the door panel. Model RM24.
Remove the top decoration strip
A.
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,
B.
assure
that
it is the same size as
the old panel,
Install the new panel by inserting
c.
one of the vertical sides of the
panel into the groove of the door
frame (4).
Bend the panel gently so that the free
D.
side of the panel can be slipped into
corresponding groove of the door
frame (5).
Push the panel downwards so that the
E.
lower horizontal edge of the panel
is fitted in the bottom groove (6).
Between the upper edge of the panel
F.
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
G.
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-
H.
ration strip by means of the two
screws (1).
The panel is then locked
in proper position.
5.
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
15
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,
2.
possible).
Drill
3.
door pan as pattern.
Fit the sealing gasket as shown in the figure 21.
4.
Fit the door and adjust it so that it seals properly.
5,
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
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
4.
6.
REPLACEMENT OF EVAPORATOR DOOR CASKET -
1.
2.
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
to
RM36C
Fig. 24
26).
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