From the manual:
HOW TO START THE REFRIGERATOR
Leveling
In the boiler, ammonia vapor is distilled from an
ammonia-water mixture and carried to the finned condenser,
where it liquifies. The liquid flows to the
evaporator, where it creates cold by evaporating into a
circulating flow of hydrogen gas. If the evaporator coil is
not level the liquid readily accumulates, forming pockets
which can impair the gas curculation or even block it, in
which case, of course, the cooling will stop.
When the recreational vehicle is stationary it must be
leveled to be comfortable to live in. If the refrigerator is
properly installed, the freezer shelf parallel to the floor,
the refrigerator will then also perform properly. A bubble
level should be placed on the freezer shelf. When the
vehicle is in tow, the continuous rolling and pitching
movement will not affect the refrigerator as long as the
movement passes either side of level, but when the trailer
is temporarily parked this sensitivity of the refrigerator
should be remembered. So once more, before you start
the refrigerator make sure the recreational vehicle is
leveled to be comfortable to live in.
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