atwood 8500-IV Series Furnace (8516, 8520, 8525, 8531, 8535) - Manuel (Page 5)

IMPORTANT: If any original wire has to be replaced, it must be replaced with type 105° C or its equivalent.
Terminal Block on 85 Models only.
RED
BLACK
YELLOW
YELLOW
YELLOW
BLUE
RED
HIGH TENSION
INSIDE
FURNACE
+ 12V DC
NEG
RED
YELLOW
ELECTRODE
VALVE
RED 1
4
2
5
3
6
1
4
2
5
3
6
+THERMO
MOTOR
CIRCUIT
BREAKER
IGNITION
CONTROL
BLW PWR SAIL
SWITCH
WHITE
LIMIT
SWITCH
WHITE
BLUE
BLUE
YELLOW
RED
GROUND
BLUE
THERMOSTAT
ON
OFF
ON/OFF
SWITCH
THERMO
14
CUSTOMER SUPPLIED WIRING
12V DC
SUPPLY
5
4. Secure furnace to coach floor with four screws. LOCATE SCREWS TO
AVOID DAMAGE TO ANY WORKING COMPONENTS , WHILE MAINTAINING PRESSURE
SEAL AGAINST GASKET ON SCREEN .
CUTOUT
RECOMMENDED WALL THICKNESS 1-1/2˝ - 2-1/2˝
DO NOT OVERSIZE HOLE - OVERSIZING CAN RESULT IN WATER LEAKAGE
EXTERIOR WALL CUTOUT A B
RECESS FURNACE ( FIG 13 ) 4-3/4˝ 5˝
5. Place recess cover over top of furnace with all edges of door outside
of control box. Hold firmly into place while using holes in door to
locate mounting tabs and clips. Use #8 or #10 sheet metal screws to
fasten door in place.
Follow STANDARD FURNACE INSTALLATION instructions for ducting, thermo-
stat and draft cap assembly.
SYSTEM CHECKS
ƽ
WARNING
FIRE OR EXPLOSION
•
Never check for leaks with an open flame.
PROPANE GAS PRESSURE TEST
The furnace and any individual shut-off valve must be disconnected
from gas supply piping system during any pressure testing of system
at test pressures of more than 1/2 PSI.
Before furnace is connected piping systems must be tested to be leak
free. The test must maintain air pressure of at least 6˝ of mercury or 3
PSI for at least 10 minutes.
The entire piping system must be maintained within a range of 10-14˝
W.C. when all appliances are in operation. Test gas connections for
leakage with a leak test solution.
STATIC PRESSURE TEST ( FIG . 1)
Please refer to Engineering Addendum when installing the furnace. This
will provide you with allowable maximum case static pressures with
each possible variation of duct configurations. The addendum is avail-
able from your Atwood Field Service Representative or by calling
Atwood Service Toll Free.
Reducing the number of duct turns and stretching the ducts will
increase airflow and reduce static pressure. Adding ducts or increasing
the discharge (hard duct) system will also reduce static pressure.
You must follow the manufacturer’s recommendations and specifica-
tions for optimum performance and proper operation.
DIAGNOSTIC CHART
FAULT LED INDICATION
Internal Circuit Board Failure Steady on, no flashing
Limit switch/Airflow problems 1 flash with 3-second pause
Flame Sense Fault 2 flashes with 3-second pause
Ignition Lockout Fault 3 flashes with 3-second pause
Note: On/OFF Switch may be separate
or combined with Circuit Breaker.