OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 42 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 5: INITIAL START-UP
5.2.3 Accessing The Analyzer Probe Port
1.
Remove the 1/4” NPT plug from the exhaust manifold.
2. If necessary, adjust the stop on the combustion analyzer probe so it will extend mid-way
into the flue gas flow.
DO NOT install the probe at this time.
Figure 5-3: Analyzer Probe Port Location
5.2.4 Recommendations For WHM Operation
It is strongly recommended that installations with multiple
Centurion units operate in Water
Heater Management (WHM) mode (see Section 2.13 for instructions on installing the actuator-
controlled Sequencing Isolation Valve). This is to ensure the system flow is divided between
units as demand increases, and that all units receive equal run time and additional Water
Heaters are activated based on the
Next On
Valve Pos
firing rate setting.
In case of pre-heated DHW systems with multiple Centurion units, it is recommended to lower
the
Next On
Valve Pos
setting to 30-40% (Default=50%), so subsequent Water Heaters are
engaged sooner to provide rapid response and divide the system flow over additional units. In
case of DHW pre-heat systems, the required temperature rise through an individual unit can be
much lower to ensure flow per unit does not exceed 50 gal. (189 L) per minute.
5.3 Combustion Calibration
Centurion Water Heaters are set up for either Natural Gas or Propane gas, as specified by the
Style Number on the Sales Order, and if applicable calibrated for Standard NOx emissions (<20
ppm) before shipping.
Recalibration as part of initial start-up is necessary due to changes in the local altitude, gas BTU
content, gas supply piping and supply regulators. Combustion Calibration Test Data sheets,
shipped with each unit, must be filled out and returned to PVI for proper Warranty Validation. It
is important to perform the combustion calibration procedure below to provide optimum
performance and keep readjustments to a minimum.
COLD WATER INLET
CONDENSATE DRAIN
DRAIN VALVE
BUILDING
RECIRCULATION
WATER INLET
ANALYZER
PROBE PORT