Install Instructions

131
IM-PR 566442 1114 (Design Manual)
Figure 5-16 Copper Manifold with manifold
pressurization kit (1) and drain valve (2)
General information on these individual steps is
provided in the following sections. For product-
specific information, consult manufacturers’
instructions (e.g., Viega PI sheets).
5.13.1 Pressure testing, filling and purging
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 the installation of the surface to
be heated (whether concrete, asphalt, pavers, etc.).
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.
• 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.
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.
1
2
Filling
The percent glycol solution will affect supply
temperature, heat output, expansion tank size and
circulator operation, so ensure that filling is done
accurately. First, figure the capacity of the entire
system in gallons to determine the required amount
of glycol (% volume solution) from:
• Tubing (refer to data table)
• Boiler (from manufacturer)
• Additional tanks or reservoirs (from
manufacturer)
Before injecting the glycol solution, thoroughly
clean and flush the system.
The solution can be mixed outside the system in
drums or barrels and then pumped in using a fill
and purge kit (Figure 5-17) or some other suitable
method.
• Mix solution at room temperature using water
that is soft and low in chloride and sulfate
ions.
• Watch air vents during lling to prevent loss
of solution.
• To avoid dilution, the system and the cold
water supply should not be permanently
connected (so automatic ll valves are usually
not used).