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With an O2 probe (NXCESO2) installed, the PPC4000 will provide boiler efficiency. Along with the
O2 probe it is also necessary to install an inlet air temperature sensor (FXIATS-140) and configured
to either sensors 3, 4 or 5. Parameters necessary to calculate boiler efficiency are entered through the
O2 SETUP submenu. The PPC4000 uses the current O2 value to determine the current CO2 value.
Conditions required to display boiler efficiency:
1. In the O2 SETUP submenu, O2 OPERATION is configured to operate as MONITOR or
CONTROL.
2. FUEL TYPE properly selected.
3. Inlet temperature sensor connected to sensor 3, 4 or 5.
4. Flue temperature is required to calculate efficiency.
5. Efficiency will be shown in AUTO only.
6. Items relating to efficiency are not shown if O2 OPERATION is DISABLED.
Sensor 3, 4 and 5
Sensors 3, 4 and 5 are provided to connect an inlet air temperature to be used for the boiler efficiency
calculation. Fireye provides 3 ranges of inlet air temperature: -50°F to 300°F (-45°C to 149°C),
-40°F to +140°F (-40°C to 60°C), 32°F to 350°F (0°C to 176°C).
It is the responsibility of the installer to only designate either sensor 3, 4 or sensor 5 as inlet air, set-
ting the others to UNUSED. Access to sensor 3, 4 or 5 configuration can be done under SENSOR
SETUP in the top layer menu.
The values shown represent the maximum value of the sensor range.
COLD START THERMAL SHOCK PROTECTION
Cold Start Thermal Shock Protection is a method to slowly increase the burner firing rate on a cold
start to limit mechanical stress due to thermal differences. The PPC4000 offers two methods of ther-
mal shock protection: Low Fire and Segment. After thermal shock is satisfied, THERMAL EXIT
satisfied, operation of the boiler is handed over to either setpoint 1 or 2.
Thermal shock setpoints are accessed from the top layer menu and is indicated by THERMAL
SHOCK SETUP >. Press the NEXT key to enter this submenu.
The setpoints associated with THERMAL SHOCK are:
METHOD TYPE:
user selects UNUSED, LOW FIRE or SEGMENT.
If UNUSED is selected then all menu items below this menu item are not displayed.
Line items marked with 1 are LOW FIRE method.
Line items marked with 2 are SEGMENT method.
The factory default is UNUSED.
SENSOR USED:
user selects which sensor to use for thermal shock protection. The options are sen-
sor 1, 2 or 3. The sensor used choices are limited to what sensors are selected as USED in the SEN-
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