Dometic RMT 7855 Original Betriebsanleitung

©Dometic GmbH - 2005 - Subject to change without notice

Publications-Nr.:

599 5230-23 DE

T.B. MB 10/2005

Service-Instruction

English

ABSORPTION REFRIGERATOR + OVEN for RECREATION VE ICLES

COOL

3110

RMT 7650

RMT 7850

RMT 7651

RMT 7851

RMT 7655

RMT 7855

Page

1.0 Description of Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.0 Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.0 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.0 Optionen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.0 Ser ice/Maintenance/Tables . . . . . . . . . . . . . . . . . . . . . . 18

7.0 Further Documentation . . . . . . . . . . . . . . . . . . . . . . . . . 22

The instruction on hand is completed and revised regularly.

Table of Contents

Models 1

RMT 7650

RMT 7850

Piezo-fridges

are equipped with a manual energy

selector and a thermostatic regulation of the coo-

ling compartment temperature during 230V and

gas operation.

MES

- fridges (Manual Energy Selection) and

AES

fridges (Automatic Energy Selection) are equip-

RMT 7651

RMT 7851

PIEZO

RMT 7XX0 Series

MES

RMT 7XX1 Series

AES

RMT 7XX5 Series

RMT 7655

RMT 7855

RMT 7650(L) 1515 x 525 x 596 150 lit. 26 lit. 190 W/170 W ca. 3,2 KWh/380 g 59,0 kg •

RMT 7850(L) 1515 x 525 x 651 175 lit. 31 lit. 190 W/170 W ca. 3,2 KWh/380 g 60,7 kg •

RMT 7651(L) 1515 x 525 x 596 150 lit. 26 lit. 190 W/170 W ca. 3,2 KWh/380 g 59,0 kg •

RMT 7851(L) 1515 x 525 x 651 175 lit. 31 lit. 190 W/170 W ca. 3,2 KWh/380 g 60,7 kg •

RMT 7655(L) 1515 x 525 x 596 150 lit. 26 lit. 190 W/170 W ca. 3,2 KWh/380 g 59,0 kg •

RMT 7855(L) 1515 x 525 x 651 175 lit. 31 lit. 190 W/170 W ca. 3,2 KWh/380 g 60,7 kg •

Oven only

28 lit.

CMBO 100 g/h (gas only) •

Model Dimensions Gross Usable

Connection

Consumption Net Ignition

H x W x D (mm) capacity capacity of Mains / Battery electricity / gas weight Piezo automat.

depth incl. door incl. freezer freezer comp in 24hrs

This instruction contains descriptions essentially to MES and AES models .

A description of the function components (compact fitting, burner etc.) of the PIEZO

models can be found in the SERVICE HANDBOOK "Absorption-Refrigerators for

Recreational Vehicles".

1.1 Technical Data

ped with electronics for controlling the function

elements and status indication of the active ope-

ration source. Additionally AES-fridges provide

the possibility of manual energy selection.

At both ranges of models, the cooling compart-

ment temperature is regulated thermostatically in

all operation sources (12 V-/230 V~/GAS)

1Models

Main components accessible via ventilation

grille and control panel.

Fridge does not necessarily have to be dein-

stalled for service and alteration.

Gas supply point on back of fridge;

accessible via lower ventilation grille.

means : Improved Access for Maintenance !

Low voltage control at 230V~ operation

Switching to an other energy source at

200 V +/- 7V

No low voltage control at 12V -- operation

Lighting with one light bulb 12V/2W ;

Do not use 8V- light bulbs!

Power supply for burner control device and

gas valve: 1,5 V controlled by the electronics /

power module.

Operationwith12V;230Visdisplayed"green"

with LED .

If no supply voltage is available the LED lights

"red" at

AES

appliances.

It does not light at

MES

appliances.

AES

models the selected energy is dis-

played by the corresponding LED (i.e. 230V)

and the "AUTO" LED simultaneously.

During the refuelling stop (switch over time to

gas mode 15 min.) the appliance is

in stand-by operation mode and only the

"AUTO" LED lights up (no supply of energy

meanwhile).

NOTE: The refuelling delay cannot be reseted

by switching off/on or manual choice of

energy.

Switch over times / time delay at "AUTO"-

function at AES models :

12 V Solar 230 V~

Gas 12 V D+

5 s

15 min.

100 s

5 s

5 s 5 s

20 s

5 s

Priority

1. 12 V- Solar

2. 230 V~

3. 12 V- D+

4. Liquid gas

1.2 General Remarks

Button Ais used for selection of the wanted ener-

gy source; Button B is used for setting the tempe-

rature. Using the gas modus, the ignition is carried

out fully automatically (ticking noise can be heard)

formax.30seconds.Operationviaelectricalener-

gyis indicatedwith green,gasoperationis indica-

ted with yellow.

Operating 2

2.1 Controls

Manual energy selection / manual ignition (RMT 7650, RMT 7850)

A= switch on and energy selection

(Refrigerator)

D= switch for frame heating

B= gas/electric thermostat AC/DC

(Refrigerator)

E= operating display frame heating

C= manual ignition button “Piezo ignition/battery

igniter”

G= Galvanometer

(Refrigerator)

J = switch on / thermostat

(Oven)

DGEA BCJ

Manual energy selection / automatical ignition

MES

(RMT 7651, RMT 7851)

A= switch on and energy selection

(Refrigerator)

D= switch for frame heating

B= gas/electric thermostat AC/DC

(Refrigerator)

E= operating display frame heating

C= operating displays 3 LEDs

(Refrigerator)

J = switch on / thermostat

(Oven)

DEAC B J

Automatical + manual energy selection / automatical ignition

AES

(RMT 7655, RMT 7855)

A= switch on and energy selection

(Refrigerator)

B= gas/electric thermostat AC/DC

(Refrigerator)

C= operating displays 4 LEDs

(Refrigerator)

D= switch for frame heating

E= operating display frame heating

F= temperature setting display

H= dimmer for LED-displays

(only accessable when door opens)

J = switch on / thermostat

(Oven)

EAC BJ

The space-saving electronics is mounted directly

behind the front fascia. The LED for status indica-

tion, energy selection switch and temperature re-

gulation are integrated. In conformity with the mo-

dels RMT 7xx1 and

RMT 7xx5 there are electronics for

MES

and

AES

The

MES

-electronics does not have contacts for

the D+ and solar signal. The

AES

-electronic is ad-

ditionally equipped with the dimmer.

The equipping of the RMT 7XX0 (piezo)-fridges

differs from the traditional piezo-fridges of the

RM7-series,duetothe standardbattery-igniterfor

gas operation.

A= Energy selector switch (underneath cover)

B= Battery of the oven’s igniter

C= Compact fitting

D= Battery igniter for gasburner of the fridge

Components / Refrigerator

Typisch AES: 4 LED Kennzeichnung mit Art.-Nr. Codierte Kompaktstecker

All operation modes (DC/AC/GAS) are control-

led thermostatically.

The temperature sensor is fitted at the post

evaporator.

3.2 Electronics/Power module (RMT 7xx1, RMT 7xx5 only)

3.3 Temperature-Sensor / NTC (nur RMT 7xx1, RMT

3.1 Components (RMT 7650, RMT 7850 only)

Function electronics (Power module)

The electronics regulates the controlling of the

function elements according to the selected ener-

gysource,e.g.powersupplyofthe Burner Control

Device. The AES-electronics additionally regula-

tes the selection of the most convenient energy

source, according to the priority "230 V~/12 V-

/GAS", as well as the 230V~ under voltage control

(no under voltage control at 12V-Modus), as well

as the delay in switching to the gas mode during a

refuelling stop.

The function electronics also controls the tempe-

rature sensor and the lighting. The electronics is

protected against possible short circuit errors of

the Burner Control Device with a 500mA fuse.

Burner Control Device P810

The Burner Control Device controls the ignition of

the flame during the gas modus and supervises

theignition (security-ignitionca. 30sec.). Flamere-

cognition and controlling is carried out via an io-

nization electrode in the burner chamber (flame

failure device). For security reasons, there is an

additional earth contact on the burner chassis,

whichleadsto theBurnerControlDeviceThecon-

trolling of the gas valve GV100 is also carried out

via the Burner Control Device.

Gasvalve GV100

The gas valve GV100 consists of two series-

connected valves (increase of security). The valve

locks itself at a pressure of > 1 bar.

Components / Refrigerator

POWER MODULE

BURNER

CONTROL

DEVICE

GAS VALVE

DC-heating element

AC-heating element

Ignition electrode

Ionisation electrode

Temp. Sensor

230 V~

12 V-

Solar

D+

Interior light 12 V/2 W

3.4 Wiring scheme (MES/AES)

3.5 Operating priniciple

Components / Refrigerator

At the backside of the fridge the gas (safety) valve

and the burner control device is assembled,

which are operated with approx. 1.5V, controlled

by the electronics.

1Burner Control Device P810

(igniter, flame control, flame safety device)

2Gasvalve GV100

(gas sefety device, includes 2 serial mounted

valves; automatically closed at a

pressure > 1bar)

3Gas connection below

4Ignition electrode

5Ionisation electrode

6Ground

(Connection to burner control device)

Theionization controlisused for flame recognition

in the burner chamber. The burner chassis serves

as earth contact.

3.6 Gas operation components

A= Screws of the rearwall

B= Gas connection

1= temperature sensor

2/C = Terminal 12 V DC

3= Ignition device

4= Ignition electrode

5= Gas burner

6= Thermo couple

7= Gas thermostat

Components / O en

3.7 Components

123

< 407 146 554

< 407 146 555

Gas burner 30 mbar < 407 146 564

Gas burner 50 mbar < 407 146 565

< 407 146 556

< 407 146 557

The power must be supplied via a properly eart-

hed socket outlet or hardwired connection.

Where a socket outlet is used for the mains

connection lead, the outlet must be freely ac-

cessible.

It is advisable to run the incoming supply through

an 2 Amps on-board fuse or automatic cir-

cuit breaker. The power cable must be laid in such

a way that it does not come in contact with hot

components of the cooling unit/burner or with

sharp edges.

4Installation

4.1 Electrical installation

Power line connection

The mains 12V connection cable is connected

(observing correct polarity) to a terminal strip. The

cabling must be by the shortest possible route to

the battery and alternator respectively. (Connec-

tion A, B)

Cross-sectional area

of cable Length of cable

6 mm2< 6 m

10 mm2> 6 m

The 12V circuit must be protected with a 16A

(20A RM 76xx) fuse

The heating element circuit A/B must be connected

to the vehicle battery by a suitable ignition opera-

ted relay in order that the 12V supply is only live

while the vehicle ignition is switched on.The

connection C/D (interior light, electronics ; cable

black / violet) must be permanently attached, and

must not be cut-out when the vehicle ignition key is

turned off.

Battery connection

Connections:

A= Ground heating element DC

B= Plus heating element DC

C= Ground electronics

D= Plus electronics

D+ = alternator signal

S+ =

AES

-input-control signal

(solar charge regulator

12 V DC

permanent supply Connection of

12 V heating

element





RMT 76X1 L

RMT 78X1 L

RMT 76X5 L

RMT 78X5 L

Terminal block

D+ connection:

The D+ control (Dynamo +) must be connected

to the respective vehicle terminal.

(D+ = alternator signal while motor is running).

Solar control input (S+):

Connection only when using a solar system with

a solar charging controller with AES output. The

respective solar charging controllers are

available from a specialized dealer. The "Solar"

(S+) control connection must be connected to

the respective terminal of the solar charging

controller (AES output).

Cable cross-sections

There are no particularly high current flows via

the D+ and S+ connection; therefore no particu-

larly large cross-section is required for these

connections (approx. 1mm²).

Cross sect.-area of cable: recomm. min. 1,5 mm2

For RMT 7xx5 L-models only!

above

below

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