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Atwood 8935 Technical Installation Manual page 5

8900-iii series
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3. A. When set for LP and NAT is required:
Rotate plug and replace into valve tower.
NAT
SHOULD NOW BE VISIBLE FIG
B. When set for NAT and LP is required:
Rotate plug and replace into valve tower.
LP
SHOULD NOW BE VISIBLE FIG
4. Check rod for proper positioning while tightening plug into tower.
The plug, which has been factory calibrated for this valve only,
should be reinstalled finger tight.
INSTALL ONLY THE CORRECT MAIN BURNER ORIFICE FOR TYPE OF GAS BEING USED
ORIFICE REPLACEMENT
1. Remove rain shield by tilting as depicted in
2. Remove burner assembly from control box.
3. Remove two screws holding burner head in place.
4. Use a 7/16˝ socket to remove orifice and replace correct orifice cor-
responding to type of gas required, which corresponds to regulator
plug setting
5.
FIG
5. Replace burner head with two screws.
6. Reinstall burner assembly. Burner assembly must seal tight against
control box.
7. Replace rain shield and four screws.
8. After converting furnace,
IN PLAIN SIGHT
vided in your conversion packet) on rating label.
SYSTEM CHECKS
FIRE OR EXPLOSION
• Never check for leaks with an open flame.
DIAGNOSTIC CHART
FAULT
Internal Circuit Board Failure
Limit switch/Airflow problems
Flame Sense Fault
Ignition Lockout Fault
11
DC Wiring Diagram
GROUND
ELECTRODE
YELLOW
VALVE
SAIL
YELLOW
SWITCH
RED
WHITE
LIMIT
SWITCH
HIGH TENSION
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.
5
5
DO NOT USE PLUG ON ANY OTHER VALVE
9 insert.
FIG
, put "
" sticker (pro-
CONVERTED
WARNING
LED INDICATION
Steady on, no flashing
1 flash with 3-second pause
2 flashes with 3-second pause
3 flashes with 3-second pause
MOTOR
BLACK
RED
CIRCUIT
BREAKER
RED
ON/OFF
ON
SWITCH
OFF
RED
+ 12V DC
1
1
YELLOW
NEG
4
4
+THERMO
BLUE
2
2
BLUE
THERMO
5
5
3
3
6
6
BLW PWR
THERMOSTAT
IGNITION
BOARD
BLUE
BLUE
RED
YELLOW
CUSTOMER SUPPLIED WIRING
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 the gas connections for
.
leakage with a leak test solution.
STATIC PRESSURE TEST
CASING STATIC PRESSURE TABLE
If duct static pressure cannot be set, casing static pressure should not exceed
the values listed below when taken cold.
DUCTING SYSTEM
DC
MODELS
AC
MODELS
: For maximum performance and reliability refer to Installation Addendum
NOTE
for manufacturer's recommendations and specifications.
Voltage greater than indicated will cause higher static readings.
Reducing the number of duct turns and stretching ducts will increase
air flow and reduce static pressure. Adding ducts or increasing dis-
charge system (hard ducting) will also reduce static pressure.
1. With door open, locate static pressure tap or use location on back of
casing
1.
FIG
2. Shut off gas supply to furnace.
3. Insert static pressure tube onto tap and attach an incline manometer.
With door closed, pressure should not exceed values specified in
CASING STATIC PRESSURE TABLE
4. Remove pressure tube when finished. Close door or reinstall cover.
NOTE: Circuit Breaker and ON/OFF Switch may be
separate or combined components.
12
AC Wiring Diagram
Electrode
12V DC
SUPPLY
Green
Valve
DO NOT
+
+
4
1
GRIP
HERE
2
3
Yellow
Red
Off
Blue
On
Red
Green
5
(
.
FIG
1)
OPERATING VOLTS
FLEXIBLE
12
0.25˝ W.C.
120
0.25˝ W.C.
.
PICTORIAL DIAGRAM
Green
Yellow
Yellow
3 3
Sail
White
Switch
2 2
Black
1 1
Black
Transformer
Black
Blue
Yellow
Ignition Control
Limit Switch
1 2 3 4 5 6
Blue
HIGH TENSION
HARD
0.35˝ W.C.
0.35˝ W.C.
Motor
Black
Brown
120 VAC Green
120 VAC Black
120 VAC White
Thermo Blue
White
AC Capacitor Motor Run
+Thermo Blue

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This manual is also suitable for:

8940