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Viessmann AirflowPLUS AH2A Installation, Operating and Service
Installation Examples
Vertical installation
The A/C coil is installed in the downflow position of the
Viessmann AirflowPLUS air handler.
Return air
A
Supply air
Proper Piping Practice
2 imperfect threads
Connecting to the Heating System
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 50.
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.
(continued)
Air Filter
B
A/C coil
Leave 2 threads bare
IMPORTANT
A field fabricated auxiliary drain pan with drain pipe is
required in all configurations.
CAUTION
Return air openings shall not be installed in back panel.
A
Supply air
temperature sensor lead shall be routed out of
air handler casing through knock-out provided in either
side of casing and secured to plenum using nylon clips
provided.
Drill 3/8 in. dia. hole in return air duct a minimum of
15 in. (381 mm) downstream of plenum.
Snap round bushing into hole and insert sensor lead
approximately 2 in. (51 mm) and secure to duct using
nylon strap included.
Supply air temperature
B
lead wires shall be isolated from high voltage leads
and routed through knockouts provided.
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.
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.
Installation
sensor lead and low voltage
17
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