Dometic MANUAL REFRIGERATOR User manual

DOMETIC
Dometic
MANUAL REFRIGERATOR
DIAGNOSTIC SERVICE
MANUAL
The
Dometic Corporation
Corporate Office
Warranty
Department
2320 Industrial Parkway
Elkhart, IN 46515
219-295-5228
205 E. Fenn St.
LaGrange, IN 46761
219-463-2191
Technical Services
Department
509 S. Poplar St.
LaGrange, IN 46761
219-463-4858
OS1286 8/89
D-l
Diagnostic Service Manuals
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

NOTES:
D-2
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

MANUAL REFRIGERATOR
DIAGNOSTIC SERVICE ‘MANUAL
Table of Contents
Page
Diagnostic Flow Charts
No Operation . . . . . . . . . . . . .
No
12OV AC Operation . . . . . . . . .
No Gas Operation (Piezo Igniter) . . . .
No Gas Operation (Automatic Reigniter)
. .
Operation and Diagnosis
Dometic Manual Refrigerators. . . . . . .
Glossary of Terms . . . . . . . . . . . .
Service Bulletins
. . . . . . . . . . . .
D-4-l
D-4-2
D-4-3
D-4-4
D-6- 1
D-8-l
D-9-l
D-3
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

MANUAL REFRIGERATOR
DIAGNOSTIC FLOW CHART
NO OPERATION
A.
1
Check Supply Voltage
1. 110 Volt Plug
2. Wire Size
Correct as Necessary
OK
B.
V
Check Fuse Correct as Necessary
NOT OK Replace if Defective
OK
.c.
Check wiring Correct as Necessary
NOT OK
OK
D.
Check Switch NOT OK
Correct as Necessary
(Page D-6-20, Para. 66)
OK
E.
V
Check Thermostat , Correct as Necessary
NOT OK Continuity Check
D-4-l
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

MANUAL REFRIGERATOR
DIAGNOSTIC FLOW CHART
NO 120 VOLT AC OPERATION
A.
1. Check AC Power
2. Refrigerator Plugged in
3. Breaker
4. Coach Plug
Correct as Necessary
OK
B.
Check Selector Switch NOT OK
Correct as Necessary
(Page D-6-20, Para. 66)
OK
c.
V
Check Thermostat Correct as Necessary
Continuity Check
NOT OK
OK
D.
Check 120 Volt Heater
NOT OK
Correct as Necessary
Ohm’s Reading
Bulletin #28
(Page D-9-l 4, D-9-l 5)
D-4-2
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

MANUAL REFRIGERATOR
DIAGNOSTIC FLOW CHART
NO GAS OPERATION - Models Equipped with Piezo igniter
.
Check Gas Supply
OK
B.
Check Switch
I
NOT OK
Correct as Necessary
(Page D-6-20, Para 66)
OK
.C.
Check Thermostat
OK
D.
V
Check Gas Pressure
OK
NOT OK
NOT OK
Correct as Necessary
Continuity Check
Correct as Necessary
(Page D-6-13, Para. 37)
Check Flue & Burner
NOT OK
Correct as Necessary
No Obstructions
OK
F.
Check Piezo Resistance
I
NOT OK
Correct as Necessary
(Page D-6-l 8, Para. 58)
OK
G.
V
Check Piezo Electrode
I
r
Replace Electrod
(Page D-6-18, 58)
NOT OK
OK
Check Spark Gap Correct as Necessary
of Electrode to Burner NOT OK (Page D-6-19,
Para. 62)
D-4-3
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

MANUAL REFRIGERATOR
DIAGNOSTIC FLOW CHART
NO GAS OPERATION - Models Equipped with Automatic Reigniter
A.
Check Gas Pressure
NOT OK
Correct as Necessary
(Page D-6-13, Para 37)
OK
B.
V
Check Gas Supply
I
OK
NOT OK
Correct as Necessary
(Page D-6-14, Para. 40)
C.
Check 12 Volt D.C.
Supply
Correct as Necessary
NOT OK
I
OK
Check Switch
NOT OK
Correct as Necessary
(Page D-6-20, Para. 66)
I
OK
_E.
Check Thermostat
NOT OK
Correct as Necessary
Check for Continuity
OK
F.
V
Clean Assembly &
Check Flue & Burner Orifice as Necessary
NOT OK
I
OK
,G.
Check Electrode
Replace Electrode
(Page D-6-19, Para. 62)
NOT OK
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

NOTES:
D-5
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

OPERATION & DIAGNOSIS
OF
DOMETIC
MANUAL REFRIGERATORS
D-6-1
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com

(1)
This is Dometic’s Manual Refrigeration Diagnosis and Troubleshooting program. In this program
we will discuss the way an absorption cooling unit operates, and the diagnostic procedures
used to troubleshoot the complete refrigerator system.
(2)
Before we begin extensive troubleshooting
procedures on the cooling unit, let’s take a few
minutes to see how it operates.
THE ABSORPTION SYSTEM
(3)
The sealed combustion unit contains a
mixture of ammonia, water and a rust
inhibiting agent. After this solution is
introduced into the coils, this unit is
pressurized with hydrogen gas. When
this system is in operation, the am-
monia vaporizes in the hydrogen atmo-
sphere and absorbs heat from inside
the refrigerator.
EVAPORATOR
GAS
TEMPERATURE
EXCHANGER
ABSORBER
VESSEL
BOILER
.
D-6-2
Manual Compliments of
Northwest RV Supply
Printed From
http://www.nwrvsupply.com