System Checks - Atwood hydro flame 8900-III Series Technical Installation Manual

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.
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
BLUE
+THERMO
2 2
BLUE THERMO
5 5
3 3
6 6
BLW PWR
THERMOSTAT
IGNITION
BOARD
BLUE
BLUE
RED
YELLOW
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 OPERATING VOLTS
DC 12
MODELS
AC 120
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
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.
12
AC Wiring Diagram
GROUND
ELECTRODE
YELLOW
GREEN
RELAY
GREEN
VALVE
TRANSFORMER
SAIL
YELLOW
SWITCH
RED
BLUE BLUE
OFF
ON
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
( .
FIG 1)
FLEXIBLE
0.25˝ W.C.
0.25˝ W.C.
1.
FIG
.
MOTOR
BLACK
120 VAC GREEN
120 VAC BLACK
CIRCUIT
BREAKER
BLACK 120 VAC WHITE
BLACK
BROWN
-
THERMO BLUE
YELLOW
1 1
WHITE
WHITE
2 2
WHITE
BLACK
3 3 WHITE
AC CAPACITOR
MOTOR RUN
+ THERMO BLUE
IGNITION
CONTROL
BLUE
THERMOSTAT
RED
GREEN
HARD
0.35˝ W.C.
0.35˝ W.C.