Utica Boilers MGB Series II/MGC Series Instruccion De Instalación

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Circulators in following illustrations are mounted on system supply side, mounting on system return side is also 

acceptable practice.

Boiler used in connection with refrigeration system, 

install so chilled medium is piped in parallel with boiler 

with appropriate valves to prevent chilled medium from 

entering boiler. See Figure 2.

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.

Hot water boilers installed above radiation level or 

as required by authority having jurisdiction must be 

provided with low water cut-off device.

Boiler connected to heating system utilizing multiple 

zoned circulators, each circulator must be supplied with 

flow control valve to prevent gravity circulation.

Hot water boilers and system must be filled with water 

and maintained to minimum pressure of 12 psi.

For Low Water Cutoff, see Figure 1 for minimum height. 

Use Kit #240010831. Follow instruction enclosed with 

the kit. Other LWCO's for their manufacture specific 

instructions.

Bypass piping is optional 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. Figures 4 and 5.

B.  These methods are used to protect systems using 

radiant panels and material they are encased in 

from high temperature supply water from boiler 

and protect boiler from condensation. 

NOTE#1:  When  using  bypass  piping,  adjust 

valves V1 & V2 until desired system temperature 

is obtained. See Figure 5, page 9.

NOTE#2:  Bypass loop must be same size piping 
as supply and return piping.