TriangleTube Prestige Cascade System - Manual (Page 26)

Installation
23
Hydronic Junction
The hydronic junction serves as a low loss header provid-
ing hydraulic separation, dirt separation and air elimination.
When utilizing a hydronic junction the mixed system
supply temperature can be calculated as follows:
When the boiler/Cascade flow rate does not equal the
system flow rate, the total heat output of the boil-
ers/Cascade will be absorbed by the system when the
following conditions are met:
- The boiler/Cascade supply temperature is
greater than the system supply temperature.
- The boiler/Cascade flow rate is less than the
system flow rate.
- The return temperature of the system is equal
to the return temperature of the boiler
/Cascade.
The installation of the hydronic junction only applies
when the Cascade system is configured in a primary
secondary arrangement. The maximum number of
boilers that can be piped up to a single hydronic junc-
tion is five. The hydronic junction can be installed on
either the right or left side of the distribution mani-
fold. The hydronic junction can be rotated 180
degrees about its height or vertical axis.
1. Place the hydronic junction in the location to be
installed. The distribution manifold must be consid-
ered in determining location.
2. Connect the hydronic junction to the distribution
manifold using the gaskets and hardware provided.
3. Level distribution manifold and hydronic junction.
NOTICE
NOTICE
4. Install air vent and drain valve in the Hydronic
Junction, see Figure 23. The air vent should be
installed in the top tappings as shown. The drain
valve (1-1/4” NPT shut off valve) should be
installed horizontally using a 1- 1/4” NPT 90º elbow
and 1-1/4” NPT x 4” nipple in the tapping located at
the bottom. The handle on the shut off valve will
need to be in the horizontal position when the valve
is closed. Remove handle and install accordingly.
Insulation
It’s recommended to install insulation to minimize
standby losses.
Position and secure insulation to hydronic junction as
shown in Fig. 23.
BEST PRACTICE
Air
Vent
Boiler
Supply
Boiler
Return
System
Supply
System
Return
Drain
Valve
Fig. 23: Hydronic Junction
System
Supply Temp.=
[(Boiler Supply Temp. x Boiler Flow Rate) +
(System Return Temp. x Bypass Flow Rate)]
System Flow Rate
Bypass
Flow Rate (System Flow Rate - Boiler Flow Rate)
=