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the room temperature at the time of the complaint must be considered, as a unit which is satisfactory at an ambient temperature ofo650F (+18OC) may not be satisfactory at 95 F (+35 C).
In cases where satisfactory performance is obtained "MAX" but not on other settings, the thermostat
is to be suspected.
When a normal unit is working on "MAX" the absorber coil will be warmer at the bottom than it is at the top. The absorber vessel will be warmer. The vapour cooling pipe from the boiler to the condenser will be warm, bearably to the hand, at the bend where it joins the condenser, with a gradual rise in tem- perature towards the 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 cap. It is strictly applied provision of the warranty extended on the unit to the customer, that any interference with the filling valve will automatically void the warranty.
Unsatisfactory unit performance due to an ammonia leak can be determined in the case of a visible leak by traces of a yellow deposit at the point where the ammonia is escaping. If there is a leak on the evaporator inside the cabinet, a smell of ammonia may bee noticeable.
COOLING UNIT REPLACEMENT RM360, RM460, RM660
Remove the refrigerator from its recess as follows
1.Check that refrigerator is empty and remove ice tray.
2.Turn off gas bottle.
3.Disconnect gas line to inlet valve
CAUTION: Use a backup wrench to prevent undue rotation.
4.Unplug the electric line from the trailer outlet.
5.Remove the 4 screws in rear front frame.
6.Check for any additional screws which the vehicle manufacturer may have used to fasten the refrigerator in place.
7.Carefully slide the refrigerator straight out of its recess.
To remove the cooling unit from the cabinet, proceed as follows:
1.Place the refrigerator on a work bench of suitable height.
2.Remove the thermostat capillary tube by loosening the two screws (1) on the eva- porator fins (fig. 14).
CAUTION: The locations of the thermostat capillary tube should be noted at this time for relocation later on. The tubes must be placed in the right position, otherwise, improper performance may re- sult.
3.Remove the two sealing plugs for capillary tube, one on the back and one inside the cabinet, and straighten the tubes.
4.Remove the capillary tubes by going to the back of the refrigerator and gently pulling the tubes straight out.
Fig.14
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