Aerco Benchmark Series - Water Level, Temperature, and Flame Faults; Lockout and Relief Valve Tests

SAFETY DEVICE TESTING
6-4
9. Reset the Combustion safeguard and
CLEAR the Annunciator.
10. Start the unit.
6.6 AIR PRESSURE FAULT TEST
1. Disconnect AC power from the unit.
2. Disconnect wire #155 from the air pressure
switch located on the air/fuel valve (See Fig.
6.4).
3. Restore AC power to the unit.
4. Produce a “call for heat” to start the unit.
The unit should fault and display the
message “LOCKOUT RUN”
Figure 6.4
Blower Proof Switch Location and Wiring
5. Disconnect AC power from the unit.
6. Replace wire #155.
7. Restore AC power to the unit.
8. Reset the combustion safeguard and clear
the annunciator display.
6.7 LOCKOUT RUN FAULT TESTING
1. Turn the ON/OFF switch to the OFF
position.
2. Remove SSOV cover by removing the
screws securing the actuator to the valve
body. (See Fig. 6.5).
3. Remove wire 149 or 148 from terminal 4 or
6. (See Fig. 6.6).
4. Start the unit.
5. The unit should shutdown and displays the
message “LOCKOUT RUN”.
6. Clear the Annunciator. Turn the ON/OFF
switch to the OFF position.
7. Disconnect AC power to the unit.
8. Remove the air/fuel valve cover by
loosening the 3 screws securing it in place.
(See Fig. 6.7).
Figure 6.5
SSOV Actuator Set Screw Location
Figure 6.6
SSOV Terminal Connections
HARNESS
155
CNO
154
TO FRAME
A/F VALVE