Crown Boiler FWZ Series, Installation Instructions Manual

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18) After chimney has warmed-up for at least 5 minutes, adjust barometric draft regulator to obtain a draft at the 1/4” tapping
shown in Figure 11.0 that is within the range shown in Table 11.1. DRAFT AT THIS LOCATION MUST NEVER BE
POSITIVE.
19) Check the CO
2
and confirm that it is between the minimum and maximum limits shown in Table 11.1. Adjust if
necessary.
20) Verify that the smoke level still does not exceed #1 and that the draft in the breech still within the range prescribed by
Table 11.1.
21) Turn off the burner and remove pressure gauge. Install and tighten gauge port plug, then restart the burner.
22) Check for clean cutoff of the burner. Air in the oil line between fuel pump and nozzle will compress, while burner is
running, and expand when burner shuts off, causing nozzle drip after burner stops. Cycle burner on and off 5 to 10 times
to purge air completely.
23) Check thermostat operation by raising or lowering its set point as required, cycling burner on and off.
24) Verify primary control operation and safety features according to procedure outlined in the instructions furnished with
the burner.
25) Check high limit control operation. Jump thermostat terminals and allow burner to run until boiler water temperature
exceeds high limit setting. The burner should shut down, and circulator continue running. Allow the temperature to drop
below the control setting. The burner must restart. Boiler installation is not complete unless these checks are made and
are satisfactory. Remove thermostat jumper and reconnect thermostat upon check completion.
26) After the boiler has operated for approximately 30 minutes, check the boiler and heating system for leaks. Repair any
leaks found at once.
27) After the above checks have been completed, leave thermostat(s) at desired setting. Leave all instructions provided with
the boiler with owner or in boiler room, displayed near boiler.
FIGURE 11.0: FLUE DRAFT TAPPING