Purge Switch Open During Purge - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING

5.10 PURGE SWITCH OPEN DURING PURGE

The Purge switch (and Ignition switch) is located on the Air/Fuel Valve. To check the switch,
proceed as follows:
Purge Switch Open During Purge Check Instructions
1. Set the Controller's Enable/Disable switch to Disable.
2. On the Controller, go to:
in Manual Mode.
3. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
4. Remove the Air/Fuel Valve cover by rotating the cover counterclockwise to unlock it (see
Figure 5-10).
5. Remove one of the two wires (#171 or #172) from the Purge switch (Figure 5-11a – 5-11c).
6. Set the Controller's Enable/Disable switch to Enable to start the unit.
7. The unit should begin its start sequence, then shut down and display Prg Switch Open
During Purge.
8. Replace the wire on the Purge switch and depress the CLEAR button. The unit should
restart.
BLOWER PROOF
SWITCH
AIR/FUEL VALVE COVER
(Rotate Counter-Clock-
Wise to Remove)
BLOCKED
INLET
SWITCH
Figure 5-10: Air/Fuel Valve Cover Location – BMK1500 Shown
OMM-0137_J •
12/20/2022
Main Menu → Diagnostics → Manual
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Run, and then put the unit
AIR/FUEL
VALVE
Page 79 of 167