750-382
CBT
4-19
Full modulation boilers
4. The burner and its gas connection must be leak tested before placing the boiler into operation.
5. Gas Pressure Regulator - Using the adjusting screw on the main gas regulator, adjust the inlet pressure to the
recommended levels in Table 4-3.
*Maximum pressure without the use of an upstream regulator.
4.1.14 — Power-up
1. Ensure blower motor is properly wired for the available power supply.
2. Verify the voltage (control voltage is 115V-1Ph.-50/60Hz) to ensure it is within specifications.
3. To power the control and blower circuits, the CC-Blower switch to the “ON” position.
4. When the control and blower circuits are powered, commissioning may begin. Turn the Demand switch to
the “LOC” (Local) position. On the Operation page, the Demand status should indicate “Steam”. The boiler
will now start if the LCI and ILK circuits are satisfied and the steam pressure is below the current On point.
TABLE 4- 3. CBT Gas Pressure Requirements
CBT Size Natural Gas LP Gas
Min (“WC) Max (“WC)* Min (“WC) Max (“WC)*
10 7.0 14 11.0 14
15 7.0 14 11.0 14
20 7.0 14 11.0 14
25 7.0 14 11.0 14
30 8.0 14 11.0 14
FIGURE 4-13. Premix burner technology - full modulation
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