Install Instructions

IM-PR 566442 1114 (Design Manual)
92
Figure 4-6 Mixing Station with manifold
pressurization kit (1) and drain valve (2)
Diverting
Valve
components (mixing devices, purge
assembly, isolation valves, circulators, etc.).
4. Prior to purging secondary piping, manifolds
and circuits, ensure that the boiler and
associated primary piping have been purged
of all air.
5. Purge stations, manifolds and circuits
according to manufacturers’ instructions.
Refer to PI (product information) sheets for
hydronic mixing block, ProBloc and mixing
stations.
6. Ensure that all electronic components
have been wired as per manufacturers’
instructions. Refer to PI sheets for controls,
etc.
7. Utilize controls to activate system circulator(s)
and relevant heating/cooling source(s).
Ensure that heating supply temperature
increases and that piping is not reversed.
8. Run heating source (e.g., boiler) up to its
maximum supply temperature to ensure
proper function of internal temperature
controls.
9. Set mixing devices according to
manufacturers’ instructions. Refer to PI
sheets for hydronic mixing block, ProBloc
and mixing stations.
10. Check that the controls are working properly.
Refer to manufacturers’ control instructions
for more information (including but not limited
to reset controls, thermostats, powerheads,
zone controls, etc.).
11. Ensure proper balancing of all circuits
according to completed design calculations.
Refer to PI sheets for instructions.
General information on these individual steps is
provided in the following sections. For product-
specific information, consult manufacturers’
instructions (e.g., Viega PI sheets).
4.2.1 Pressure testing and purging
Pressure testing and purging methods are
similar across residential and commercial
systems. Before the finish floor is installed in panel
installations, and before and during the slab pour
for in-slab installations, the radiant system must be
pressure tested.
Pressure Testing
When conducting pressure testing, air or water may
be used as the medium. To simplify leak detection if
tubing is damaged, pressure should be maintained
during concrete pour for in-slab systems and during
the installation of any covering, such as flooring,
gypsum wall board, pavers, etc, across all systems.
The following pressure testing procedure
is recommended by Viega. Check the local
building codes for compliance or additional test
requirements.
1. Double-check all connections to manifold to
ensure proper seal.
2. Connect manifold pressurization kit (1) to any
drain valve (2).
3. Pressurize the system to 100 psi to detect
potential nail or screw penetrations.
4. The system should hold the 100 psi for a
minimum of 1 hour prior to the installation
of the tubing covering or slab. Note that
the gauge will fluctuate to some extent with
temperature change, with lower pressures
expected as temperatures decrease.
a. For in-slab applications, retighten any tubing
couplings located in the slab area after at
least 12 hours of system pressurization.
Maintain and monitor pressure until
concrete has adequately cured.
b. For dry systems, the pressure test must
be continued during installation up until
the time that the system is put into
operation.
NOTE: If the tubing becomes damaged during the
installation, remove the damaged section of tubing
and replace with repair coupling(s). After making
an in-slab repair, be sure to protect the fitting(s)
with repair coupling wrap prior to concealing the
connection. See Appendix B.