750-382
CBT
4-21
Full modulation boilers
2. Lower the switch setting to minimum.
3. Initiate burner sequence. During the main flame establishing period, verify gas valve LEDs energize, indicating
both safety shutoff valves open.
4. The CB Falcon should lock out on an interlock failure (Lockout 67).
5. Reset CB Falcon.
6. Open the downstream manual shutoff valve to clear the lockout condition.
7. Dial the HGPS back to its maximum setting and reset.
IGNITION FAILURE CHECK
7. Close the downstream shut off valve and attempt to start the burner. The Falcon should lock out, indicating
Lockout 109 Ignition Failure.
After making the above operation checks, re-open the downstream manual shut-off valve.
4.1.16 — LWCO and ALWCO Check
• Before testing low water controls, disconnect power to the feed pump.
LWCO
1. To verify proper LWCO operation, conduct a blowdown of the water
column (refer to Chapter 5, Section 5.3 - Water Column Blowdown).
2. During WC blowdown, the burner should shut off when low water level
is reached.
3. Upon shutdown, check the LWCO control board in the CBT electrical
panel. The LED indicator should be off, indicating that the LWCO has
switched off the control circuit.
ALWCO
1. To check the ALWCO, drain the boiler (refer to Chapter 5, Section 5.2 - Blowdown).
2. Observe the ALWCO control board in the CBT electrical panel. When the ALWCO level is reached, the LED
indicator should go out.
3. Close the blowdown valves, refill boiler and reset the ALWCO.
• After testing the low water controls, reconnect power to the feed pump.
FIGURE 4-15. LWCO test
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