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Installation
Proper Piping Practice
2 imperfect threads
Connecting to the Heating System
16
Viessmann AirflowPLUS AH2A Installation, Operating and Service
Leave 2 threads bare
Support piping by proper suspension method.
Piping must not rest on or be supported by the air handler.
Use moderate amount of dope.
This section constitutes an overview only! Refer to
subsequent sections for detailed information on individual
piping connections.
Use an approved pipe sealant or teflon tape when
connecting the following installation fittings.
Air handler piping
Depending on the boiler selected and system design it
may be required to use a primary, secondary piping
arrangement to de-couple the flow through the boiler
from the flow through the air handler. Refer to the system
layout examples starting on page 49.
Boiler
Follow the instructions provided with the boiler for
installation and start-up of the boiler. Make sure the
heating device is turned off during air handler installation
and service. Ensure system has been filled, and all air
is purged from the system before turning on the heating
boiler.
Duct work
All duct designs must be designed to conform with ARI
Manuals "J" and "D" or local codes and requirements.
To minimize fan noise in the living space, it is recommended
that the first six feet of supply and return air duct be lined
with acoustic insulation.
Return and supply air duct work should be the same size
as the air handler openings up to the first branch, fitting or
transition.
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