Installation Guide

located throughout a structure placed
near each main fixture group and are
supplied by the main hot and cold
s
upply lines similar to the branch and
main system. The manifolds
essentially branch multiple lines from
a common location in lieu of multiple
tee fittings spread out. This takes
advantage of benefits from both types
of systems and helps keep hidden
fittings to a minimum.
Design factors for installing
combination systems
Just like the branch and main system,
condensed floor plan layouts are
preferable to minimize hot water main
supply lines being stretched out
everywhere. This additional water
requires purging prior to hot water
being present at each fixture. These
systems can also suffer from
fluctuating pressure during multiple
fixture use.
2.2.4 Domestic Hot Water
Circulating Systems
A hot water circulation system can be
incorporated in most plumbing
systems and works by constantly (or
periodically throughout the day on a
timer) circulating hot water through
the main hot supply line of your
plumbing system. This is done by use
of a return line at the end of the main
hot supply line, and a low flow pump
(usually near the hot water tank).
It keeps hot water readily available
throughout the entire main hot water
supply line eliminating the need to
purge the entire line before hot water
i
s present at the fixture.
There are a number of hot water
circulation systems available in the
market place that offer a variety of
options.
These systems are ideal for branch
and main or combination systems
with spread out fixture groups/floor
plans, as well as for larger homes
using multiple MANABLOCs in a
parallel type system.
Design Factors For Hot Water
Circulation Systems
• Installing a hot water circulation
system
You will want to use either a gas or
electric tank water heater. Use of a
tankless or instantaneous type water
heater will drastically increase the
operating cost of the system.
There are many types of these
systems available on the market
today. Research which type is best for
the particular application. Insure all
the components being used within the
circulation system are rated and/or
approved for a hot water circulation
system. These systems may require
some maintenance and/or repairs
over time which could include
complete pump replacement.
Note: There are costs associated with
running these systems due to the
electricity required to operate the
pump, this will vary depending on the
frequency of operation and size of the
pump.
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Viega IM-PFMB 1007
Combination Installation.