Patterson-Kelley MOD-04 owner manual Flushing and Filling, Water Quality, Inspection

Modu-Fire®Gas-Fired Boiler

WARNING!

Never install a valve that can isolate the low water cutoff from the boiler.

Drain Valve and Piping

The boiler is not provided with external drain con- nections. A drain valve should be installed near the inlet (system return) connection to the boiler and piped to a suitable floor drain. The boiler can be completely drained through the bottom header by removing the flush plug in the bottom end plate.

This plug may also be used to flush accumulated sediment from the bottom of the boiler.

3.8.4 Flushing and Filling

Flushing the System

Before filling the boiler, flush the system to remove the debris. Clean and flush old piping thoroughly before installing the boiler as recommended by your water conditioning or chemical treatment supplier.

Under no circumstances should the hydronic system be flushed while the boiler is attached to the system since the debris or corrosion products could accu- mulate in the boiler and plug the boiler heat ex- changer.

If the piping system attached to this unit will be chemically cleaned, the boiler must be disconnected from the system and a bypass installed so that the chemical cleaning solution does not circulate through the boiler.

Filling

To be sure that the boiler is not air-bound, open the pressure-relief valve located at the rear of the boiler. Leave the relief valve open until a steady flow of water is observed. Close the valve and finish filling the system.

3.8.5 Water Quality

The boiler is designed to operate in a closed-loop system. As such, the system should be tight and not require make-up water. A high percentage of un-

Installation

treated make-up water can cause premature failure due to buildup of scale. Such failure is not covered by warranty.

Scale can also reduce efficiency. For example, a scale thickness of 1/16" will result in a 12.5% loss of efficiency.

The water quality should be within the guidelines established by the American Boiler Manufacturers Association, as follows:

•	Total solids:	2,500 ppm
•	Total alkalinity:	500 ppm
•	Total hardness:	150 ppm

The amount of oils, fats, grease, and other organic matter should be limited to 10 ppm.

Consult your water conditioning or chemical treat- ment supplier for analysis and recommendations.

If antifreeze is to be used in the system, the cus- tomer should perform a hazard analysis to determine the use and disposal of the antifreeze.

3.9BURNER AND IGNITION SYSTEM

3.9.1 Inspection

Inspect the burners to be sure nothing was damaged or knocked loose during shipment. Make sure that the mixer core in the top of the burner is centered in the burner head; (see burner photo in section on "Cleaning the Burner" Section 5.2). Inspect the pi- lot line, main gas train and ignition electrode to be sure they were not damaged during shipment or in- stallation. Check to see that the pilot is securely attached and that it is properly positioned to ignite the main burner.

3.10PRE-START CHECK LIST

Before attempting to start the boiler, make sure the following items have been completed.

1. Flue gas from the boiler is properly vented.

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