6
CONNECTING SUPPLY AND RETURN PIPING
Bypass piping is an option which
4.
gives the ability to adjust the supply
boiler water temperature to fit the
system or condition of the installa-
tion. This method of piping is not
typically required for baseboard
heating systems.
This method is used to protect
A.
boilers from condensate forming
due to low temperature return
water. Generally noticed in large
converted gravity systems or
other large water volume sys-
tems. See
Figure #3
.
These methods are used to pro-
B.
tect 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
Figures #4
&
#5
.
NOTE:
5.
When using bypass piping,
adjust valves A and B, in
Figures #3
&
#5
, until desired system tempera-
ture is obtained.
NOTE:
6.
When using a 4-way mixing
valve, set control knob until desired
temperatures are met. See instruction
supplied with valve.
Bypass loop piping must be the same
7.
size piping as the supply and the
return.
Typical installation using circulators
8.
is shown in Figure #6 on following
page.
Typical installation using zone
9.
valves is shown in
Figure #7
on fol-
lowing page.
For further piping information refer
10.
to the I=B=R installation and piping
guide.
ZONE
CIR.
VALVE
FLOW
VALVE
EXPANSION
TANK
VALVE
SYSTEM
TEMPERATURE
GAUGE
RETURN
SUPPLY
"A"
"B"
WATER
FEED
ZONE
CIR.
EXPANSION
TANK
SYSTEM
TEMPERATURE
GAUGE
RETURN
SUPPLY
4 WAY MIXING
VALVE
WATER
FEED
Figure 3 - Bypass Piping
Figure 3 - Mixing Valve Piping
National Excelsior Company
www.excelsiorhvac.com
Subject to change without notice.
