ECR Dunkirk PVWB Series, Manual

6

Figure 4

Remove sticker from front of gauge. See Figure 

• 

4.

Connect Supply and Return Piping to boiler. 

4. 

Connections may require certain additional fi ttings 

and parts, as shown on diagram (Figs. 5 and 6). 
Boiler equipped with 1-1/4” supply and return 

5. 

connections on both left and right sides of boiler.
In connecting cold water supply to water inlet 

valve, make sure clean water supply is available. 

When water supply is from a well or pump, install 

sand strainer at pump.
Hot water boiler installed above radiation level 

or as required by Authority having jurisdiction 

must be equipped with low water cutoff device 

at time of installation. Periodic inspection is 

necessary, as is fl ushing of fl oat type devices, per 
manufacturer’s specifi c instruction.

FOR USE WITH COOLING UNITS
A. This boiler, when used in connection with a 

refrigeration system, must be installed so that the 
chilled medium is piped in parallel with the heating 
boiler. Appropriate valves must be used to prevent 
the chilled medium 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 fl ow 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)
Install 3-way or 4-way mixing valve (or suitable 
alternative) to prevent low temperature return water 
from entering boiler when used in heating system 
designed for low water temperature (below 140°F, 
e. g. radiant fl oor heating).  Follow mixing valve 
manufacturer’s installation instructions.

INSTALLATION - SYSTEM PIPING