750-382
CBT
4-17
Full modulation boilers
Safety parameters
When configuring safety parameters an additional verification step is required to confirm the changes.
1. When a safety parameter is changed, the Safety Parameter Verification page will appear. Press <Begin> to continue.
2. The affected parameter group will be displayed, showing current parameter values and a prompt, “Are these parameters
set to proper values?”. Press <Yes> to continue.
3. The screen will indicate RESET DEVICE NOW. Open the control panel and press the RESET button on the CB Falcon
controller (press and hold for 3 seconds).
RESET must be pressed within 30 seconds to save changes.
Note: When changing multiple safety parameters, the verification steps do not need to be completed immedi-
ately.
See Appendix for complete instructions on using the CB Falcon Display/Interface.
4.1.9 — Program module
CB Falcon parameter information (non-safety parameters only) can be uploaded/
downloaded using the optional Program Module. When the Program Module is
installed, its features are accessible from the Falcon Setup page. See Appendices
for instructions.
4.1.10 — Burner sequence
In addition to providing modulation control, the CB Falcon is responsible for flame
supervision and burner sequencing.
The CBT boiler uses direct spark ignition (no pilot) to light the main flame. Flame
sensing is accomplished using an ultraviolet (UV) flame detector.
Basic burner sequencing:
1. Heat request detected (Setpoint minus On Hysteresis); LCI limits and steam demand detected (terminals J6 3 and J8 3).
2. After a system Safe Start Check, the Blower (combustion air fan) is started
3. After the ILK input is energized - 10 sec. allowed for IAS input (combustion air proving) to energize - and the purge rate
proving fan RPM is achieved, prepurge time is started.
4. When 30 sec. purge time is complete, the fan RPM is changed to the lightoff speed.
5. As soon as the fan-rpm is equal to the light-off RPM, the Trial for Ignition or Pre-Ignition Time is started (depending on
configuration). If enabled, Pre-Ignition Time will energize the ignitor and check for flame prior to TFI.
6. Trial for Ignition (4 sec).
7. The ignitor and the gas valve are energized.
FIGURE 4-11. Parameter change dialog
FIGURE 4-12. Program module
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