Dunkirk XEB-2 Installation Instructions Manual page 7

1. Place boiler in the selected location (as near
chimney as possible). Your boiler is shipped
assembled.Youneed onlyto installthe circulator,
ball valves the relief valve with a drain line to
carry any water to a drain, and the drain valve.
2. Install Relief Valve on 3/4"pipe nipple in tapped
opening in the left end section. Connect a drain
line of the same pipe size (3/4" to carry any
water away to a drain. No shutoff of any
description shall be placed between the safety
reliefvalve and the boiler,or on discharge pipes
betweensuch safetyvalvesandthe atmosphere.
Installationof the safety reliefvalveshall conform
to the requirements of the ANSI/ASME Boiler
and Pressure Vessel Code, Section IV.
3. Install Drain Valve on lower left side of boiler
as marked.
4. Connect Supply and Return Lines to boiler.
The connections may require certain
additional fittings and parts, as shown on
diagram (Figs. 5 and 6).
If you are installing an entire new heating system,
first install all of 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
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.
A hot water boiler installed above radiation level
must be equipped with a lowwater cutoff device.
A periodic inspection is necessary, as is flushing
of float type devices, per manufacturers specific
instructions.
When 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 valves to prevent
the chilled medium from entering the heating
boiler (Fig. 7).
Whenthis boileris connectedto heatingcoilslocated
in air handlingunits 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)
If the boiler is to be used in a heating system
where design water temperatures below 140 °
F are desired (e.g. radiant floor heating), a 3-
way or 4-way mixing valve or suitable alternative
is required to prevent low temperature return
water from entering the boiler. Follow the mixing
valve manufacturers installation instructions.The
minimum design return water temperature to
the boiler to prevent condensation in the boiler
and venting is 120 ° F The minimum high limit
setting is 140 ° F.
ISOLATION
BALL VALVE
FILTROL