Legend HS-808 Installation Manual
300 N. Opdyke Rd.
Circulato
Auburn Hills, MI 48326
www.legendhydronics.com
www.legendhydronics.com
1-866-752-2055
866-752-2055
HS-808
HYDRAULIC SEPARATOR
Introduction
The HS-808 Hydraulic Separator is a multi-function device that provides hydraulic separation, air elimination
and dirt removal in a single, compact device that requires little maintenance. The HS-808 functions as a
“Bridge and a Disconnect” between a heating/cooling systems power generating unit(s) and the distribution
system. The ow pattern through the HS-808 depends on the ow rates of the primary and secondary sides
of the system. (See ow diagrams in the Size Section) The various mixing patterns internal to a hydraulic
separator create a blending of the primary and secondary ows and temperatures, thus creating a “Bridge”
between the two sides. Modern hydronic systems, especially those that contain low mass, water tube
boilers, like a Mod-Con, generally have a relatively high ow / high head pumping requirement to operate at
peak efciency on the Primary side. In contrast, the Secondary, distribution side of the system, often has a
relatively low, even variable ow, with very little pumping head. The HS-808 Hydraulic Separator provides
a “Disconnect” between these very distinct requirements on the primary and secondary sides of the system,
so that they do not interfere with each other. Hence, the “Bridge and Disconnect” benet of a hydraulic
separator.
Additional features of the HS-808 Hydraulic Separator include: Air & Debris Removal - The ows of both the
primary and secondary sides of the system go into the HS-808 where the uid velocities slow down allowing
air to rise and be vented out through a serviceable automatic air vent, and dirt particles to fall out and collect
at the bottom, ready to be purged out through the Purge Valve with standard ¾” garden hose connection.
High
Eciency
Boiler
To & From Zones
(e.g. Radiant Manifolds)
Installation Guide
Pictured:
HS-808 with LegendConnect™
Adaptors
Zone
Circulators
Boiler
r
Hydraulic
Separator
w/Air Vent
and Purge
Pictured:
Sample System
Advantages of the HS-808
- Provides hydraulic separation between the primary & secondary sides of the system.
- Allows for variable system ow and xed or variable boiler ow, without pump interference between
the two sides.
- Includes a high capacity automatic air vent with service check for the removal of air from the system.
- Includes a drain valve with ¾” garden hose threads for the purging of collected dirt from the system.
- Available in up to 6 different connection types, in multiple sizes.
- Has a ½” plugged port where you could mount a thermometer and / or pressure gauge.
- Includes an aluminum embossed insulation shell and aluminum tape.
300 N. Opdyke Rd.
Auburn Hills, MI 48326
www.legendhydronics.com
www.legendhydronics.com
1-866-752-2055
866-752-2055
HS-808
Installation Guide
HYDRAULIC SEPARATOR
HS-808 Size Selection
To select the proper size HS-808 for the project, determine the maximum ow rate for both the primary (f1) and secondary (f2) circuits, considering each of the
possible ow conditions for the system as shown in the diagrams below. Select the HS-808 connection size from the Sizing Chart below that can handle the
highest of (f1) and (f2).
SIZING CHART
Connection Size Maximum Flow Rate Cv
1” 11 gpm *
1-1/4” 18 gpm *
1-1/2” 25 gpm *
*The pressure drop through the HS-808 is so low, the Cv is not
measurable.
Installation / Assembly
1. To install the HS-808 Hydraulic Separator, remove the Union Nut (13) and EPDM Gasket (12) from
all four connection ports and set them aside.
2. Install the adhesive insulation rings, (5) & (6) around the stub pipes of the HS-808, to prepare
for the use of the insulating shell. Remove the adhesive backing and attach each piece around the
corresponding connection size.
3. Install the system piping into the selected LegendConnect™ adaptor using standard piping
practices. (For more detailed instructions on installing the LegendConnect™adaptors, please review
the LegendConnect™ Installation Manual.)
4. After the system piping is connected to the LegendConnect™ adaptor, take the union nut (13) that
was removed in step 1, and slide it over the system pipe.
5. Insert the EPDM gasket (12) that was removed in step 1 into the union nut, and hand tighten it to
one of the HS-808 ports.
6. Repeat steps 3 thru 5 for the other three ports.
7. After all four of the LegendConnect™ adaptors have been attached, position the HS-808 in the
desired position in the system and use a wrench to tighten the union nuts. Typically no more than a ¼
turn past hand tight is needed to create a seal.
2
6
5
4
1
7
3
8
11
10
12
13
9
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