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Viessmann AirflowPLUS AH2A Installation, Operating and Service
Installation Examples
Vertical installation
The A/C coil is installed in the downstream air flow of the
Viessmann AirflowPLUS air handler.
Discharge 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" dia. hole in return air duct a minimum of 15"
(381 mm) downstream of plenum.
Snap round bushing into hole and insert sensor lead
approximately 2" (51 mm) and secure to duct using
nylon strap included.
Discharge sensor lead and low voltage lead wires shall
be isolated from high voltage leads and routed through
knockouts provided.
Vertical installation
The A/C coil is installed in the upstream air flow of the
Viessmann AirflowPLUS air handler. This will require the
use of the remote return air temperature sensor mounted
upstream of the A/C coil. See page 41 for additional
information regarding the remote return air temperature
sensor.
Discharge air
Discharge sensor lead and
low voltage lead wires shall
be isolated from high voltage
leads and routed through
knockouts provided.
(continued)
Discharge air
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.
Cold air return
Installation
A/C coil
Cold air return
Air Filter
For remote return air
temperature sensor drill 3/8"
dia. hole in return air duct a
minimum of 15" upstream
of plenum. Snap round
bushing into hole and insert
sensor lead approximately
2" (51 mm) and secure
to duct using nylon strap
included.
Air Filter
A/C Coil
15
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