Dunkirk XEB-4 Operations Instructions download pdf (Page 12)

Ifyou are installing anentire new heating system,first install allof

your radiation units (panels, radiators or cabinets) and the Supply

and Return Mains - then make the connections at the boiler.

In connecting the cold water supply to the water vane, 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.

A hot water boiler installed above radiation level must be equipped

with a low water cutoffdevice. A periodic inspection is necessary, as

is flushing of float type devices, per manufacturers specific instruc-

tions.

When the boiler is used in connection with refrigeration systems

it shall be installed so that the chilled medium is piped in parallel

with the heating boiler with appropriate vanes to prevent the chilled

medium from entering the heating boiler (Figure 7).

If the boiler is connected to heating coils located in air handling

units where they may be exposed to refrigerated air circulation, the

piping system shall be equipped with flow control valves or other

automatic means to prevent gravity circulation of the boiler water

during the cooling cycle.

Low Design Water Temperature Systems (Below 140° F)

And Large Water Content Systems:

Significant condensation may form in this boiler and/or

the venting system if the boiler is operated with return

temperatures of less than 120° E

Thiscondensation is corrosiveand can eventuallycause severedam-

ageto the boiler and venting system. Theminimum design return

water temperature to prevent this condensation in the boiler and

venting is 120°EThe minimum high limit setting is 140°E

Ifthe boiler is to be used in a heating systemwhere design water

temperatures below 140°Fare desired (e.g.radiant floor heating),

a 3-wayor 4-waymixing vane or suitablealternative is required

to prevent lowtemperature return water from entering the boiler.

When using a mixing vane, followthe manufacturer's installation

instructions.

If the boiler is to be connected to a system having a large water con-

tent (such as a former gravity system), it is suggested to use bypass

piping shown in Figure 8.

Figure 7 - Piping Arrangements For Boiler When Used In

Connection With Refrigeration System

VALVESA & B_OPENFORHEATmNG;CLOSEDFORCOOLING

VALVESC& D- CLOSEDFORHEATING;OPENFORCOOUNG

TOSYSTEM

Figure 8 - Bypass Piping

Front

ReturnFrom System

Throttling

Thermometer

Aquastat Water To System

Feed

Fi_Rro_With

Air Purger

[ Adi_stthe two th_ttli_g valves to maintainat leas_i20_F i:nthe boilerreLum

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Dunkirk XEB-4 Operations Instructions Page 12

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