User Guide
Table Of Contents
- Introduction
- Codes, Standards, and Certifications
- PureFlow Press Fittings
- PureFlow Crimp Fittings
- PureFlow Tools
- Product Instructions
- Tubing Overview
- Design Considerations
- ManaBloc Systems
- Installing PureFlow Systems
- Storage Recommendations
- Handling Viega PureFlow PEX Tubing
- Removing PureFlow Connections
- Repairs
- Freezing
- Water Heaters
- Heaters, Flues, Vents, and Recessed Lights
- Fastening the PureFlow System
- Supporting PureFlow PEX Tubing
- Installation Considerations
- Noise and Water Hammer
- Shower Valves
- Electrical Grounding
- Expanding Foams
- Fire Stop Compounds
- Tubing Expansion
- Calculating Expansion Loops and Offsets
- Domestic Hot Water Circulating Systems
- Installing Viega PureFlow Fittings
- PureFlow PEX Tubing Installed in Slab
- Installing PEX Under a Slab
- Installing PEX Below Grade as Service Line
- Pressure Testing PureFlow Systems
- System Disinfection
- Limited Warranty
23
PG-PF 724998 0320 PureFlow System
Viega oers several dierent manifolds to
meet a variety of applications, whether it
is a parallel water distribution system or
combination installation.
Viega Manifold Markings
Each Viega manifold is marked, where space
permits, with the following information:
Manufacturer VIEGA
ASTM Standard ASTM F877 / F1807 / F2159
Temperature Rating 180°F
Certications
UPC
®
, cNSF
®
us pw-G, CSA
B137.5, ICC-ES PMG
™
1038
Note: All manifolds may not be listed with each
organization shown
.
WARNING!
To maintain your warranty and
be code compliant, use only
Viega-approved port adapters
and supply adapters to connect Viega
PureFlow PEX tubing to the ManaBloc.
Viega polymer manifolds must be
protected from UV exposure, which
can damage them. In the event of
incidental UV exposure during storage,
installation, and handling, combined
exposure of Viega polymer manifolds
shall not exceed 15 days.
Viega Manifolds
Do not expose Viega products to any
foreign substance that includes but
is not limited to VOC (volatile organic
chemical) compounds, paints, solvents,
glues, cleaners, and disinfectants. Viega
products that are exposed to these
types of substances are at risk of having
failures (leaks).
ManaBloc Systems
ManaBloc Design and Sizing
The general sizing information shown below
may be appropriate for many ManaBloc
installations. These recommendations are
based on ow rates of typical xtures that
require 8 psi residual pressure.
The length of distribution tubing run between
the Viega ManaBloc and each xture shall
be 50 feet or less to maximize optimal
performance of the ManaBloc system.
Exceeding this recommended distance
aects the system’s ability to eciently
deliver hot water, lengthening the time it
takes for hot water to reach the xture as
well as increasing water waste. Check with
local code for run length requirements.
If this cannot be accomplished with one
ManaBloc, multiple ManaBlocs may be
required. Place one at each end of the
home to split the distribution line distance
between them (see the section on “Multiple
ManaBloc Installations” on page 26.)