Commissioning
4-2
750-382
CBT
4.1 — Full modulation boilers
4.1.1 — Operating conditions
• The installation site should be as free as possible from vibration, dust, and corrosive media
• The controllers should be located as far as possible from sources of electromagnetic fields, such as frequency
converters or high-voltage ignition transformers
• Control panel must be connected to earth ground.
4.1.2 — Filling boiler
Open the vent valve and fill the boiler slowly to allow entrapped air to escape. Do not close the vent valve until
water is visible in the gauge glass. Check to ensure that no leaks appear at any pipe connections and correct if
water leaks are noticed.
4.1.3 — Control setpoints
Preliminary settings of the burner/boiler safety controls are necessary for the initial starting of the boiler. After
the burner has been properly set, minor adjustments to these controls may be necessary for the particular
installation. For initial starting, set the following controls accordingly:
1. Combustion Air Proving Switch - Set the dial @ minimum.
2. Low Gas Pressure Switch - Set the dial @ minimum.
3. High Gas Pressure Switch - Set the dial @ maximum.
Depress all manual reset buttons for all controls prior to starting.
4.1.4 — Water level controls
The LWCO/pump control and ALWCO control boards are located in the boiler control panel. The LWCO control
is connected to conductance probes mounted within the external water column. This column has 4 probes used
for the following functions: low water cut-off, pump on, pump off, and high water alarm (optional). The ALWCO
control is connected to a conductance probe(s) in a vessel-mounted probe head. The ALWCO includes a panel
mounted manual reset/test switch.
Boiler room ambient conditions
Relative humidity
< 85% non-condensing
Ambient temperature range 0
o
C to 50
o
C / 32
o
F to 122
o
F
Storage temperature range -20
o
C to 60
o
C / -4
o
F to 140
o
F
Combustion air temperature 0
o
C to 50
o
C / 32
o
F to 122
o
F
NOTE: When using direct vent combustion in cold climates, special care must be taken to observe combustion air
temperature limits. Failure to follow this precaution may lead to equipment damage or unsafe operation.
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