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
ManaBloc Systems
26
PG-PF 724998 0320 PureFlow System
hot water source (tank) if it does
not exceed the minimum allowable
vertical and horizontal spacing
outlined in this section.
c. Install the unit in an area that is
centrally located to the most dense
concentration of served xtures.
Some applications will require that
the ManaBloc be mounted farther
than eight feet from the hot water
source. For design factors in installing
a parallel system, refer to the
PureFlow Water System Installation
Manual for suggestions on reducing
hot water delivery times in these
instances.
ManaBloc Locations
18" to 8' total
developed tube length
36" min.
6. DO NOT install the ManaBloc within
a continuously recirculating hot water
plumbing loop. The ManaBloc, however,
may be supplied from a recirculating
hot water loop (refer to “Domestic Hot
Water Circulating Systems” on page
49 for recommended options).
7. Position the ManaBloc so that it can
be securely fastened through the holes
provided in the mounting brackets.
The mounting surface should be as at
as possible so as not to induce any
twisting or bending forces on the unit.
The mounting straps (part number
45716) simplify mounting between
studs on 16" centers.
Multiple ManaBloc Installations
If a home requires multiple ManaBlocs
to service the number of xtures in
the home, these guidelines should be
followed if the ManaBlocs are closely
located to each other.
■ Consider dividing high-demand
xtures between the units.
■ Consider a reasonable division, i.e.,
upstairs/downstairs, east/west, or
front/back.
Domestic Hot Water Circulating Loop Supplying Two ManaBlocs
Hot return
Hot return
Check valves
Water heater
Circ
Pump
Cold water supply
Cold supply
Cold
Hot
Hot water supply
Hot water supply
End cap
Locating a Remote ManaBloc
A remote ManaBloc is sometimes
recommended to achieve maximum
eciency from your ManaBloc system.
It is advantageous when the line lengths
are excessive from one centralized
ManaBloc unit. When the home requires
more than one unit due to the number
of xtures or size of the home, consider
locating a remote unit near an outlying
group of xtures.