UTICA BOILERS MGB50 Installation, Operation & Maintanance Manual page 8

National Excelsior Company
www.excelsiorhvac.com
TO SYSTEM
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 heat-
ing 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. (Figure #6)
B. These methods are used to protect systems using radi-
ant panels and the material they are encased in from
CONNECTING SUPPLY AND RETURN PIPING
TO SYSTEM
WATER INLET
EXPANSION
TANK
PRESSURE
CIRCULATOR
REDUCER VALVE
SHUT-OFF
CHECK VALVE
VALVE
SYSTEM
CIRCULATOR
WATER INLET
EXPANSION
TANK
CIRCULATOR
SHUT-OFF
VALVE
Subject to change without notice.
Figure #6
BOILER
ALTERNATE
CIRCULATOR
LOCATION
BALL VALVE
3 WAY MIXING
VALVE
FROM SYSTEM
V1 V2
BOILER
ALTERNATE
CIRCULATOR
LOCATION
PRESSURE
BALL VALVE
REDUCER VALVE
ZONE VALVE
CHECK VALVE
high temperature supply water from the boiler and pro-
tect the boiler from condensation.
NOTE#1: When using bypass piping, adjust
valves V1 & V2 until desired system temperature
is obtained.
NOTE#2: Bypass loop must be same size piping
as the supply and return piping.
7. Installation using circulators and zone valves are shown
in Figures #7-#10. For further piping information refer
to the I=B=R Installation and Piping Guide.
8
FROM SYSTEM
BYPASS PIPING -
AUTOMATIC MIXING VALVE
AIR SEPARATOR
HOSE BIB
BYPASS PIPING -
FIXED LOW TEMP ONLY
AIR SEPARATOR