9
DIAGNOSTIC SERVICE MANUAL
Dometic
®
RM2604/2804
Refrigerators
RM2604 & RM2804 3-WAY 12/120 VOLTS
SECTION 8
OTHER
8.1 LEVELING
Leveling is one of the requirements for proper operation
with absorption refrigerators. The absorption design
utilizes no mechanical pumps or compressors to circu-
late the refrigerant within the system, so proper leveling
must be maintained to provide the correct refrigerant
flow. Without proper leveling, refrigerant within the
cooling unit will collect and stagnate at certain areas.
Without proper refrigerant flow, the cooling process will
stop. The RM2604 and RM2804 has a type of cooling
unit that utilizes an enclosed pump tube surrounded by a
solution to protect the assembly. To insure proper
leveling with these models, the vehicle needs to be
leveled so it is comfortable to live in. (No noticeable
sloping of floor or walls). When the vehicle is moving,
leveling is not critical as the rolling and pitching move-
ment of the vehicle will pass to either side of level,
keeping the refrigerant from accumulating in the piping.
8.2 VENTILATION
Ventilation is one of the requirements for proper cooling
unit operation. The coach vent system must be able to
provide a way to direct the hot air, produced by the
action of the cooling unit, out away from the installation
of the refrigerator. The refrigerator extracts heat from
the interior of the refrigerator cabinet and dissipates the
heat out through the vent system. In a proper installation
there should be as little open space as possible sur-
rounding the sides and top of the refrigerator to achieve
proper air flow. All potential dead air pockets should be
blocked or baffled to insure that heat won’t be trapped in
these spaces and reduce efficiency. In addition, the
cooling unit should be at least one half (1/2) inch from
the nearest surface made of combustible material.
NOTE: Refrigerators should be installed in accordance
with appropriate installation instructions received with
the refrigerator.
8.3 AIR LEAKS
0" CLEARANCE
FROM SIDE OF
CABINET
1/2" FROM
COMBUSTIBLE
MATERIALS
PATH OF
AIR FLOW
SWITCH
THERMOSTAT
TERMINAL BL OCK
TERMINAL BL OCK
TERMINAL BL OCK
HEATER
HEATER
RELAY
REIGNITER
LAMP
DOOR SW ITCH
INDICATION L AMP
TERMINAL ST RIP
ABSORPTION UNIT
BRACKET
K
M
J
L
N
O
2
6
4
7
WHITE
BLACK
GREEN
GREEN/YELLOW
1
A
C
E
G
I
B
D
F
H
2
3
4
120 VOLTS
DC
12VOLTS
AC
JK
1
2
2
1
5
1
A
B
4
2
7a 6a
5a
4a
2a
1a
D
4
2
1
4
2
2
12 VOLTS
DC
HEATER
12 VOLTS DC
REIGNITER
LAMP
N
L
120 VOLTS A C
1
3
2
I
H
L
85
86
87
30
4
2
H
C
D
1
1
E
4
4
1
1
1
2
1
I
74
7a 4a
I
L
A
J
K
12 VOLTS DC MODE
12 VOLTS DC MODE
120 VOLTS A C MODE
6
5
6a 5a
A
G
B
H
2
1
A
2a
1a
B
F
E
N
L
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