Columbia CDVB-100, Installation, Operation & Maintenance Manual, Page: 7 / 44

7
1.
Maintain minimum clearance of one inch (25mm) to hot
water pipes.
2.
Boiler, when used in connection with refrigeration
system, must be installed so chilled medium is piped in
parallel with boiler with appropriate valves to prevent
chilled medium from entering boiler.
3.
Boiler piping system of hot water boiler connected to
heating coils located in air handling units where they
may be exposed to refrigerated air circulation must be
equipped with flow control valves or other automatic
means to prevent gravity circulation of boiler water
during cooling cycle.
4.
Hot water boiler installed above radiation level or as
required by the Authority having jurisdiction, must be
provided with low water cutoff device either as part of
boiler or at time of boiler installation.
5.
When boiler is connected to heating system that utilizes
multiple zoned circulators, each circulator must be
supplied with flow control valve to prevent gravity
circulation.
6.
Hot water boilers and system must be filled with water
and maintained to minimum pressure of 12 psi.
IMPORTANT: Circulators in following illustrations
are mounted on system supply side, but mounting on
system return side is also acceptable practice.
CONNECTING SUPPLY & RETURN PIPING
7.
Bypass piping is option which gives ability to adjust
supply boiler water temperature to fit system or
condition of installation. This method of piping,
however, is not typically required for baseboard heating
systems. Typical installations where bypass piping is
used are as follows:
A. This method is used to protect boilers from
condensation forming due to low temperature
return water. Generally noticed in large converted
gravity systems or other large water volume
systems. See figure 2 .
B. This method is used to protect systems using
radiant panels and the material they are encased
in from high temperature supply water from boiler,
and protect boiler from condensate. See figure 3
and 4 .
C. This method is used to protect boilers from
condensate forming as well as protecting heating
system from high water temperatures, see figure
4 .