UTICA BOILERS Gas-fired Boiler Operating Instructions Manual page 8

FIGURE 5
3. Hot water boilers installed above radiation level must be provided with a low water cut-
off device.
4. When a boiler is connected to a heating system that utilizes multiple zoned circulators,
each circulator must be supplied with a flow control valve to prevent gravity circulation.
5. Hot water boilers and system must be filled with water and maintained to a minimum
pressure of 12 pounds per square inch.
6. Bypass piping is an option which gives the ability to adjust the supply boiler water
temperature to fit the system or the condition of the 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 6 above.
B. These methods are used to protect
systems using radiant panels and the material
they are encased in from high temperature
supply water from the boiler and protect the
boiler from condensation. See figure 7 at
right and 8 on page 8.
NOTE 1: When using bypass piping, adjust
valves A and B until desired system
temperature is obtained.
NOTE 2: Bypass loop must be same size
piping as the supply and return piping.
BYPASS PIPING
MIXING VALVE PIPING
PAGE 7
FIGURE 6
FIGURE 7