Comfort Heat Operation; Fuel/Air Adjustments; Gas Pressure Adjustment - Harsco Industrial SC-1500 Owner's Manual

The next step of the Setup Wizard is to define how the boiler is enabled. This will prompt the user to "Check
All That Apply". Most installations may include a dry contact "Remote Enable" signal to the boiler. Other
installations may also use an "Outdoor Air Sensor". Select the methods by which the boiler will be enabled or
disabled for operation. Press the "Next" button to continue.
Once the control strategy has been defined, the Setup Wizard steps through the temperature setpoints,
differentials, outdoor air reset curve (if applicable), etc. You can change these values in one of three ways:
1. Use the slider bar for quick, large temperature adjustments.
2. Use the UP or DOWN arrows for fine-tuning the temperature.
3. Touch the numeric value directly which will load a 10-digit keypad for precise control settings.
3.11.5.1

Comfort Heat Operation

Once the desired temperature adjustments are complete, touch the "Home" button to return to the Home
Screen. The Home Screen will now show the temperature setpoint, and will announce the operating condition
"Standby", "Prepurge", "Ignition" at the top of the screen. Ensure that all external control equipment
(Remote Enable, Outdoor Air Temperature Sensor, etc.) selected during the Setup Wizard is installed and
properly wired to the boiler. The boiler is now programmed for Comfort Heat operation. For applications
including Domestic Hot Water (DHW), Cascade, etc., please refer to the NURO Boiler Controller: Advanced
User's Guide, Part Number is 1004905979.

3.12 Fuel/Air Adjustments

The P-K MACH® C750-C900-C1050
with a gas/air ratio control valve and a gas safety shut off
control valve, combined into one valve assembly. The
valve functions in series with the variable speed
combustion blower to supply the correct gas/air mixture
for optimum firing performance and efficiency. The
combustion blower speed is controlled automatically by
the boiler controller. The blower speed determines the
amount of air flow and the amount of suction/negative
pressure at the gas valves. The gas valve adjusts gas
flow to maintain the proper delivery pressure at the outlet
of the valve.

3.12.1 Gas Pressure Adjustment

See rating plate for the minimum and maximum gas
pressure of the boiler. The supply pressure during main
burner operation must be greater than the minimum
indicated on the rating plate. Nominal gas supply
pressure is 7" w.c. for natural gas. The gas pressure must
not exceed 14" w.c. which is the maximum allowable
pressure on the gas train components. Each boiler is
furnished with a manual shut-off valve which has an
integrated test port. This port is located on the upstream
side of the valve body for measuring supply pressure.
The air flow is pre-set at the factory prior to shipment. Gas flow is dependent primarily on fan speed not
upstream gas pressure. The automatic gas valve may have to be adjusted to obtain proper combustion
readings for specific local conditions. A combustion analyzer must be used. Combustion must be set in
accordance with Recommended Combustion Settings for P-K MACH® Boilers Table below.
boilers are equipped
TM
P-K SONIC Gas Fired Boiler
T T T T echnical Service 1.877.728.5351 echnical Service 1.877.728.5351
echnical Service 1.877.728.5351 echnical Service 1.877.728.5351
Gas Valve w/ Test Port