Dometic RM 123E, RM 122F installation instructions Electrical Installation

F

G

H

Fig. 8

When the opening has been made in the caravan wall, the extension tube (F) may need to be shortened to suit the particular installation. To determine if this is necessary, fit the flue top (G) to the top of the central tube of the boiler casing and secure it by means of the screw

(H).

Place the refrigerator into position, then insert the free end of the extension tube through the wall of the caravan and over the outlet of the flue-top as far as it will go. Measure the length 'X' (fig. 9) of any tube protruding from the outside. Transfer this measurement to the other end of the tube as shown at 'Y' (fig. 9) and cut at right angles through the tube at this point to shorten the tube to the correct length.

Note 1. If the caravan wall is not vertical or is contoured in the vicinity of the flue outlet, it may be necessary to make a packing piece from metal or other non-combustible material, of a suitable shape to ensure that, when in position, the plate on the flue outlet is parallel with the back of the refrigerator.

Note 2. It is not advisable to lengthen the flue venting arrangement for more than a short distance as this may result in the flue gasses becoming prematurely cooled and water vapour (which is produced during the natural process of combustion) condensing in the flue and running back into the boiler insulation and burner.

At this stage, refer to items 10 and 11 in order to prepare for the 12V and bottled gas connections. When these have been made, before finally positioning the flue extension tube (F), ensure that the portion passing through the wall of the vehicle is surrounded by non- combustible material as shown in fig. 7.

Use a soft sealing compound between the flange of the flue outlet and the wall of the caravan to prevent ingress of rain water.

Fit the outer cover (B) by means of 4 screws.

It will be necessary to remove the outer cover and withdraw the extension tube before the refrigerator can be moved out of position at any time.

CUT

HERE

3

	2
1

4

5

1.Flue Baffle. 2.Therminal block 12 V. 3.Heating element 12 V.

4.Therminal block 230 V (under the cover). 5.Heating element 230 V.

Fig. 10

10. ELECTRICAL INSTALLATION

On model RM123, the boiler of the cooling unit is fitted with two separate heaters, rated at 75W, for use on 230V a.c. mains electricity, and the 12V battery in the car when the caravan is on tow.

Model RM122 does not have a 230V heater fitted.

The electrical installation must be carried out in a proper and durable manner, taking into account all relevant regulations and codes of practice. For mains voltage operation, it is important that the circuit to and in the caravan is effectively earthed. All mains voltage wiring in the caravan must be installed in accordance with current IEE Regulations including the use of an outlet and coupler to BS 4343/CEE 17.

a) Wiring for Electronic Igniter (where fitted)

The electronic igniter for the gas burner is for permanent connection to a 12V d.c. supply, e.g car battery.

In a motor-van, the igniter can be connected directly to the vehicle's main battery or to an existing 12V circuit in the vehicle which will remain on continuously and will not be switched off when the engine is switched off. In a caravan, in order to maintain the supply when the towing vehicle is unhitched, the igniter must be connected to an auxiliary battery in the caravan. The current drain of the igniter is negligible therefore the battery can be one that is also used for operating other equipment in the caravan such as the water pump, lights, etc.

Connect the igniter terminal block (fig. 11) to the battery, ensuring that correct polarity is observed-the terminals marked' + and'-' must be connected to the similarly marked terminals of the battery. The wire used for connecting should be at least 0,5 mm2 in cross-sectional area and a 0.5 or 1.0 amp inline fuse should be fitted in the feed wire, as near to the battery as possible.

Fig. 9

6