Watts AERCO Benchmark 2.0, User Manual

Page: 49 / 97

SAFETY DEVICE TESTING
6-5
SSOV
ACTUATOR
COVER
COVER
SCREW
Figure 6.6
SSOV Actuator Cover Screw Location
6.10 PURGE SWITCH OPEN DURING
PURGE
1. Set the unit’s ON/OFF switch to the OFF
position. Place the unit in manual mode and
set the fire rate between 25% and 30%.
2. Remove the air/fuel valve cover by rotating
the cover counterclockwise to unlock it and
then pulling it towards you (see Fig. 6.7).
3. Remove one of the two wires from the purge
position switch (Fig. 6.8) and start the unit.
4. The unit should begin to start, then shut
down and display PRG SWITCH OPEN
DURING PURGE.
5. Replace the wire on the purge position
switch and depress the CLEAR button. The
unit should restart.
6.11 IGNITION SWITCH OPEN DURING
IGNITION
1. Set the unit’s ON/OFF switch to the off
position. Place the unit in manual mode and
set the fire rate between 25% and 30%.
2. Remove the air/fuel valve cover (Fig. 6.7) by
rotating the cover counterclockwise to
unlock it then pulling it towards you.
3. Remove one of the two wires from the
ignition position switch (Fig. 6.8) and start
the unit.
4. The unit should begin to start then shut
down and display
IGN SWITCH OPEN
DURING IGNITION.
5. Replace the wire on the ignition position
switch and depress the CLEAR button. The
unit should restart.
VALVE
COVER
Figure 6.7
Air/Fuel Valve Cover Location
STEPPER
MOTOR
BURNER
BLOWER
169
170 171 172
IGNITION
POSITION
SWITCH
PURGE
POSITION
SWITCH
Figure 6.8
Air/Fuel Valve Purge and Ignition Switch
Locations
6.12 SAFETY PRESSURE RELIEF
VALVE TEST
Test the safety Pressure Relief Valve in
accordance with ASME Boiler and Pressure
Vessel Code, Section VI.