Dunkirk PVWB, Installation Instructions Manual

Page: 6 / 24

6
Installation - System Piping
1. Place boiler in the selected location (as near chimney as
possible.) Your boiler is shipped assembled. You need only
to install the Relief Valve and a drain line to carry any water
or steam to a drain.
2. Install Relief Valve into the 3/4" pipe on the top of the boiler.
See Figure 5. Use 3/4” Pipe and an elbow (not furnished) to
carry the water or steam to a nearby 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 of the safety relief
valve shall conform to the requirements of the ANSI/ASME
Boiler and Pressure Vessel Code, Section IV. The
manufacturer is not responsible for any water damage. Install
Drain Valve in lower left side of boiler as marked.
3. Connect Supply and Return Lines to boiler. The connections
may require certain additional fittings and parts, as shown
on diagram (Figs. 5 and 6).
4. This boiler is equipped with 1 1/4" supply and return
connections on both the left and right sides of the boiler.
In connecting the cold water supply to the water inlet 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 low water cutoff device. A periodic inspection
is necessary, as is flushing of float type devices, per
manufacturers specific instruction.
FOR USE WITH COOLING UNITS
A. This boiler, when used in connection with chilled water
systems, must be installed so that the chilled water is piped
in parallel with the heating boiler. Appropriate valves must
be used to prevent the chilled water from entering the heating
boiler (Fig. 6).
B. When this 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°)
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 manufacturer’s
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.
CAUTION
THE ISOLATION BALL VALVES CONTAIN TEFLON
SEATS AND SEALS. OVERHEATING THIS VALVE MAY
CAUSE PREMATURE FAILURE.
FIG. 5 - TYPICAL HOT WATER PIPING
FIG. 6 - CHILLED WATER PIPING