System Piping - Dunkirk Empire II Installation & Operation Manual

SYSTEM PIPING
1. When the installation of the boiler is for a new heatinq system, first install all of the radiation
units (panels, radiators, baseboard, or tubing) and the supply and return mains. After all heating
system piping and components have been installed, make final connection of the system piping to
the boiler. It is recommended to mount the circulating pump on the supply side piping, such that it
pumps away from the expansion tank. Refer to the figures on the next pages.
2. A hot water boiler installed above radiation level must be equipped with a low water cut off
device. A periodic inspection is necessary, as is flushing of float type devices, per low water cut off
manufacturers specific instructions.
3. The packaqed boiler unit is set up with 1-1/4" NPT supply and return pipinq from the front of
the boiler. The boiler supply and return piping can be moved to the rear of the boiler. The boiler
should not be piped return line to the front, supply line to the rear, or vice versa, as this will cause
the boiler water to short circuit the heat exchanger. Piping connections may require additional
fittings and parts.
4. The relief valve is meant to be installed in the back side of the rear section using the 3/4" nipple
and street ell provided in the parts bag. Connect a discharge pipe of the same pipe size (3/4") to
carry any water away to a drain. Do not connect directly to a drain, but leave an air gap. No
shutoff of any description shall be placed between the safety relief valve and the boiler, or on
discharge pipes between such safety valves and the atmosphere. Installation on the safety relief
valve shall conform to the ANSI/ASME Boiler and Pressure Vessel Code, Section IV. The manu-
facturer is not responsible for any water damage.
5. When connectinq the cold water supply to the pressure reducing valve, make sure that a clean
water supply is available. When the water supply is from a well or pump, a sand strainer should
be installed at the pump.
6. The minimum boiler supply water temperature setting on the aquastat is 140°R If the boiler is
used in a heating system where supply water temperatures below 140°F are desired, a suitable
method, such as the use of bypass piping shown in the figure below, a 3 way or 4 way mixing
valve, or some other means needs to be used to ensure return water temperatures to the boiler
are no less than 120°F. When the boiler is operated with return water temperatures less than
120°F, condensation may form in the boiler and venting. This condensation is corrosive and can
eventually cause severe damage to the boiler and venting system.
RETJRN FROM SFSTEM
- RDJJST THE TWO THROTTLING _'ALvES TD
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