8
CONNECTING SUPPLy AND RETURN PIPING
BOILER
WATER INLET
ALTERNATE
CIRCULATOR
LOCATION
TO SYSTEM
FROM SYSTEM
CIRCULATOR
SHUT-OFF
VALVE
PRESSURE
REDUCER VALVE
CHECK VALVE
BALL VALVE
3 WAY MIXING
VALVE
AIR SEPARATOR
HOSE BIB
EXPANSION
TANK
BOILER
ALTERNATE
CIRCULATOR
LOCATION
TO SYSTEM
FROM SYSTEM
V2
V1
CIRCULATOR
SHUT-OFF
VALVE
PRESSURE
REDUCER VALVE
CHECK VALVE
BALL VALVE
AIR SEPARATOR
ZONE VALVE
EXPANSION
TANK
WATER INLET
SYSTEM
CIRCULATOR
BYPASS PIPING -
AUTOMATIC MIXING VALVE
BYPASS PIPING -
FIXED LOW TEMP ONLY
Figure #6
Bypass piping is an option which gives the ability to adjust
6.
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:
This method is used to protect boilers from condensation
A.
forming due to low temperature return water. Generally
noticed in large converted gravity systems or other large
water volume systems.
(Figure #6)
These methods are used to protect systems using radi-
B.
ant panels and the material they are encased in from
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.
