Blocked Inlet Switch Test - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 5 SAFETY DEVICE TESTING
Figure 5-5: Blower Proof & Blocked Inlet Switch Locations

5.8.2 Blocked Inlet Switch Test

This test runs in simulated fire mode, the Blocked Inlet switch isolated from the rest of the circuitry.
1. Set the Controller's Enable/Disable switch to Disable.
2. Remove the air filter(s) (see Figure 5-6a, 5-6b or 5-6c, above).
The blower suction is very strong and can pull nearby objects into the fan blades. Do NOT allow anything to
be pulled into the blower! Do not wear loose clothing that could get pulled into the blower.
3. Turn off the gas supply ball valve to the boiler and then complete the following steps:
a) Use jumper wires to jump out the Low Gas Pressure switch and the Blower Proof switch.
b) Remove the black connector boot from the Flame Detector.
c) Create a connector as shown below and connect it to the Flame Detector's black connector
boot. Keep the alligator clip away from bare metal until step 4b.
Figure 5-6: Connecting the Flame Signal Generator
Main Menu → Diagnostics → Manual Mode
4. Go to:
a) Ramp boiler to 100% fire rate and set the Controller's Enable/Disable switch to Enable.
b) When the Controller enters ignition phase, it shows Ignition Trial. Attach the alligator clip
(Figure 5-8) to any metal surface or ground. The Controller displays Flame Proven and begins to
ramp up to 100% fire rate. Note that no gas or flame is present at this time.
5. Wait for the boiler to ramp up to at least 90% before continuing.
6. Cover the combustion air inlet opening with a solid, flat object, such as a piece of thick plywood or a
thick metal plate.
•
⚠
and put the unit in Manual Mode, then:
• •