Dometic Kohler 7APU Operation And Installation page 17

System Maintenance
System maintenance should be a regular program of
equipment upkeep that will keep your system running well for
years to come. There should be no need to change refriger-
ant or add refrigerant regularly unless there is a problem. If
refrigerant needs to be added, consult a service technician.
It is not suggested that internal repairs be tackled by
anyone except trained technicians.
Component Necessary Action
Compressor No maintenance is necessary.
Condenser Blower No maintenance is necessary.
Evaporator Blower No maintenance is necessary.
Heater No maintenance is necessary.
Evaporator Filter Remove, and wash with soapy water
or blow out with compressed air
monthly
Condenser Screen Clean debris from screen every
month during the cooling operating.
Condenser Coil Clean with water and soap once
yearly to remove oils and debris.
Drain Tubing Check for obstructions and position-
ing before the cooling season.
L-2347K Operation
WARNING
Dometic Environmental Corporation (Dometic) manufacturers of Cruisair, Dometic
Auxiliary A/C, Dometic Refrigerators and Freezers, Eskimo Ice, Grunert, Marine
Air, and Sentry products, makes the following safety warnings concerning the
application, installation, use and care of its products. Although these warnings are
extensive, there may be specific hazards which may arise out of circumstances
which we have not outlined herein. Use this as a guide for developing an
awareness of potential hazards of all kinds. Such an awareness will be a key
factor in assuring your SAFETY and comfort.
ELECTRICITY - Many Dometic products operate on 115, 230 or 440 volt AC
power. Such voltages can be LETHAL; therefore, the chassis, cabinets, bases,
etc., on all components must be grounded together and connected to the vessel's
grounding system. Sparks can occur as switches, thermostats and relays open
and close in the normal operation of the equipment. Since this is the case,
ventilating blowers for the removal of hazardous fumes or vapors should be
operated at least 5 minutes before and during operation of any Dometic product or
group of Dometic products. All electrical connections must be covered and
protected so accidental contact cannot be made by persons using the equipment,
as such contact could be LETHAL.
ELECTROLYSIS - Electrical leakage of any component can cause electrolytic
deterioration (electrolysis) of thru-hull components which could result in leakage
serious enough to sink a vessel which could result in loss of life. All Dometic
components must be kept clean and dry and checked periodically for electrical
leakage. If any electrical leakage is detected, the component should be replaced
or the fault causing the leakage corrected before the component is put back into
service.
GAS - Dometic Air Conditioning and Refrigeration components utilize R-22
(Chlorodifluoromethane), R134a refrigerant (Tetrafluoroethane), R-407C (which
contains Diflouromethane [HFC-32], Pentafluoroethane [HFC125], and 1.1.1.2 -
Tetrafluoroethane [HFC134a]), R404A (R125/R143a/R134 [44%/52%/4%]), or
R417a, which are non-toxic, non-flammable gases; however, these gases contain
no oxygen and will not support life. Refrigerant gas tends to settle in the lowest
areas of the compartment. If you experience a leak, evacuate all personnel, and
ventilate area. Do not allow open flames in the area of leaks because refrigerant
gas, when burned, decomposes into other potentially LETHAL gases. Refrigerant
components operate at high pressure and no servicing should be attempted
without gloves, long-sleeved clothing and eye protection. Liquid refrigerant gas
can cause severe frost burns to the skin and eyes.
VENTILATION - To cool or heat air, Dometic Air Conditioning and Refrigeration
components are designed to move air through a heat exchanger by a blower or
propeller fan. This design necessarily produces a suction on one side of the air
handling component and a pressure on the other side. Air handling components
must be installed so that the suction-pressure action does not: (1) pressurize an
area to the extent that structural failure occurs which could cause harm to
occupants or bystanders, or (2) cause a suction or low pressure in an area where
hydrogen gas from batteries, raw fuel vapor from fuel tanks, carbon monoxide
from operating propulsion engines, power generators or heaters, methane gas
from sewage holding tanks, or any other dangerous gas or vapor could exist. If an
air handling unit is installed in such a manner that allows potentially lethal gases
or vapors to be discharged by the air handling unit into the living space, this could
result in loss of life.
Maximum protection against the introduction of dangerous gases or vapors into
living spaces can be obtained by providing living spaces which are sealed from all
other spaces by use of airtight bulkheads and decks, etc., and through the
introduction of clean air into the living space. Bear in mind that the advent of air
conditioning, whether it be for cooling or for heating, naturally leads to the practice
of closing a living space tightly. Never close all windows and doors unless
auxiliary ventilating systems, which introduce clean outside air into the living
space, are used. Always leave enough window and door openings to provide
adequate ventilation in the event potentially lethal gases or fumes should escape
from any source.
CONDENSATE - All cooling units produce water condensate when operating on
the cooling cycle. This water must be drained from the cooling unit overboard. If
condensate is allowed to drip on a wooden structure, rotting or decay and
structural failure may occur which could result in loss of life. If condensate is
allowed to drip on electrical components, deterioration of the electrical compo-
nents could result in hazardous conditions. When an air conditioning system is in
operation, condensate drains may be subjected to negative pressure. Always
locate condensate drains as far as possible from points where engine waste and
other dangerous gases are exhausted so no such dangerous gases can be drawn
into the condensate drains.
Warning
Never sleep in a closed area on a boat when any equipment, which functions as a
result of the combustion of a volatile fuel, is in operation (such as engines,
generators, power plants, or oil-fired heaters, etc.). At any time, the exhaust
system of such devices could fail, resulting in a build-up of LETHAL gases within
the closed area.
17
Warning Revised: 6-5-06
English