Viessmann AirflowPLUS AH2A-354 Instruction manual

Technical Data Manual
5680 010 - 10 01/2019
Model Nos. and pricing: see Price List
Viessmann AirflowPLUS
Viessmann AirflowPLUS AH2A series
Hydronic forced air handler
Viessmann AirflowPLUS
AH2A Series, Models 213, 354 and 385
The Viessmann AirflowPLUS works directly with other
hot water sources to provide warm comfortable heating
for any home or small commercial building.
Product may not be exactly as shown

Viessmann AirflowPLUS AH2A Technical Data
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Viessmann AirflowPLUS AH2A Series
The benefits at a glance:
■Total Comfort: Delivers warm comfortable conditioned
air, warmer than heat pumps and many furnaces.
■Quiet performance: Engineered and balanced with extra
insulation for quiet operation.
■Dependable: Manufactured to precise specifications,
using high performance components.
■Accessories: Prewired for heating, cooling, and
electronic air cleaners.
The Viessmann AirflowPLUS Series is engineered to
be used with hydronic (boiler) systems, tank-less or on
demand water heaters and domestic water systems
(combo systems or aqua systems). Combo water systems
use the homes hot water heater to provide both space
heating and domestic hot water, eliminating the need for
a furnace. Outputs range from 28,000 BTUH to 115,000
BTUH.
■Multi-position: Unit mounts in any direction - upflow,
downflow or horizontal discharge right or left. Use built
in filter rack for bottom return or add on external filter
rack for other return air options (included).
■Ease of Service: All components slide out on rails for
easy maintenance and/or service.
■Cooling: Pre-wired for A/C. Just add your favorite
evaporator coil and condensing unit from most
manufacturers.
■Protection: Built-in safety sensors provide whole house
freeze protection, in case of thermostat failure.
■All designs include an integral bottom return air filter
rack and air filter and a filter rack is also provided for
side return applications.
■All models are compatible with standard or digital
thermostats.
Components
Cabinet
All cabinets have a tough, durable powder coat finish
on satin coat 20 gauge steel.
Heating coils
All heating coils are copper and assembled using no lead
solder. All coils and internal piping conform to ASTM
B-68, B-88 and/or B-743 standards.
High density aluminum fins provide maximum heat
transfer for small coil surface.
Fan and motor
The fan is a wide body dynamically balanced for extra
quiet operation. Multi-directional sleeve bearing motors
allow mounting in any direction for maximum installation
flexibility.
Circulating pump
The internal circulating pump is matched for maximum
performance. All Viessmann AirflowPLUS air handlers come
with internally mounted pumps for ease of installation.
Check valve
A check valve is built into the circulator to protect against
backflow of water.
Legend
AStandard adaptors (at the rear)
BHeating coil and pump slide out for easy service
CIntegrate pump with check valve
DFibreglass insulation with reinforced foil face and
gasket seals
EFan and controls slide out on rails
FIntegrated filter rack

Viessmann AirflowPLUS AH2A Technical Data
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Technical Data
* Using the adjustable levelling feet can add up to 1bin. (38 mm) to the height of the air handler.
** If motor speed decreases below the programmed stall speed, the motor will shut down and after a delay period,
the control will attempt to restart the motor. Starting current is limited to significantly less than full load current.
Description AH2A-213 AH2A-354 AH2A-385
Motor (ECM) hp gbc
Motor rated amps - loaded (1050 RPM) AMPS 5.0 7.7 9.6
- locked rotor AMPS ** ** **
Electrical VOLTS/PH/HZ 120/1/60 120/1/60 120/1/60
Heating BTUH
(kW)
120°F (49°C) 28,000
(8)
44,000
(13)
51,000
(15)
140°F (60°C) 46,000
(13)
61,000
(18)
74,000
(22)
160°F (71°C) 62,000
(18)
83,000
(24)
90,000
(26)
180°F (82°C) 72,000
(21)
98,000
(29)
115,000
(33)
Flow USG/min
(L/H)
3
(681)
5
(1135)
5
(1135)
Nominal (CFM) Heating .5” e.s.p.
Cooling .5” e.s.p.
Heating .2” e.s.p.
Cooling .2” e.s.p.
600
700
1,100
1,200
1,200
1,400
1,300
1,600
1,600
1,800
1,900
2,100
Cooling capacity (tons) 1.5 - 3.0 2.50 - 4.0 3.5 - 5.0
Cabinet D x W x H* in.
(mm)
22c x 18 x 32b
(578 x 457 x 825)
23 x 22 x 34b
(584 x 559 x 876)
28 x 22 x 34b
(711 x 559 x 876)
Supply air opening in.
(mm)
16 x 20
(406 x 508)
20 x 20
(508 x 508)
20 x 25
(508 x 635)
Return air opening in.
(mm)
14 x 18
(356 x 457)
18 x 18
(457 x 457)
18 x 23
(457 x 584)
Weight lb.
kg
85
(39)
100
(45)
110
(50)
Circulating pump *
Type Grundfos 15/58RU
Volts AC 115 115 115
Motor horsepower hp 1/25 1/25 1/25
Capacitor MFD/VOLTS 10/180 10/180 10/180
Motor rated amps - loaded AMPS 0.74 0.74 0.74
- locked rotor AMPS 4.44 4.44 4.44
Maximum working pressure PSI 145 145 145
Min./max. fluid temperature ºF
(ºC)
120/200
(49/93)
120/200
(49/93)
120/200
(49/93)
Hydronic heating coil
Construction Copper tubing, aluminum fins, galvanized steel support frame
Rows...fins/in. 3...12 3...12 3...12
Total face area sq. ft. (m2) 1.3 (0.12) 2.8 (0.26) 2.8 (0.26)
Piping connections
Supply in. bFIP cFIP cFIP
Return in. bFIP cFIP cFIP
Pressure drop through the coil feet of head
[@ 160°F (71°C)
supply water
temperature]
12 2 2

Viessmann AirflowPLUS AH2A Technical Data
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Dimensions
Top view
Front view Side view
IMPORTANT
The maximum ambient temperature must not exceed
104ºF (40ºC).
Legend
AHeating water supply connection
BHeating water return connection
AH2A-213 AH2A-354 AH2A-385
a in.
(mm)
22c
(578 mm)
23
(584 mm)
28
(711 mm)
b in.
(mm)
18
(457 mm)
22
(559 mm)
22
(559 mm)
c* in.
(mm)
32b
(826 mm)
34b
(876 mm)
34b
(876 mm)
d* in.
(mm)
22a
(572 mm)
24e
(620 mm)
24e
(620 mm)
e* in.
(mm)
23b
(597 mm)
25b
(650 mm)
25b
(650 mm)
f in.
(mm)
2
(51 mm)
1c
(44 mm)
1c
(44 mm)
g in.
(mm)
3
(76 mm)
3f
(92 mm)
3f
(92 mm)
h in.
(mm)
24c
(629 mm)
25
(635 mm)
30
(762 mm)
* Using the adjustable levelling feet can add up to 1bin.
(38 mm) to the height of the air handler.

Viessmann AirflowPLUS AH2A Technical Data
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Recommended minimum service clearances
For typical Viessmann AirflowPLUS installation, it
is recommended to install the air handler with the
clearances shown in the illustration.
Minimum Clearances
Horizontal Installation
Vertical Installation
a - 24 in. (610 mm)
b - 12 in. (305 mm)
These dimensions reflect the recommended service
clearance for the air handler only, ensure adequate clearance
is left for the installation of ducting, piping and electrical
connections. Only the b clearance may be reduced providing
there is enough clearance for ductwork, plumbing and
electrical connections, with zero clearance between the air
handler unit and ducting being acceptable.
Pump Model Grundfos UPS15-58RU
Rated voltage VAC 115
Rated current Amp 0.74
Capacitor F10
Power consumption Watts 87
Note: All Viessmann AirflowPLUS air handlers come with
pump speed factory set to speed 3.
Legend
ASpeed 1 Pump curve
BSpeed 2 Pump curve
CSpeed 3 Pump curve
Heating Circuit Pumps

Viessmann AirflowPLUS AH2A Technical Data
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Electrical Connections
AC Line
PMP
XFO
XFI
ECM
Power
ECM
Control
Stage 1 Heat
Stage 1 Cool
Stage 2 Cool
Fan Speed
24VAC
24VAC COM
Thermostat - field supplied A/C Relay Heat Fan Alarm
Dry Contacts
Main power supply
120VAC, 1Ph, 60Hz, 12A
Main
Disconnect
Switch
Door Safety
Switch
Viessmann AirflowPLUS
Connection Board
(optional two stage
cooling shown)
External Connections
Internal Connections
Power Connection
Terminal
>
If any of the original wires as
supplied with the appliance must be
replaced, it must be replaced with
the exact equivalent.
CAUTION
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Verify proper operation
after servicing.
WARNING
DISCONNECT POWER BEFORE
SERVICING BOILER.

Viessmann AirflowPLUS AH2A Technical Data
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Legend
AC Line
1115VAC line
2115VAC neutral
Pump (PMP)
1115VAC neutral
2115VAC line
XFO
124VAC
2N/C
324VAC-COM (GND)
XFI
1115VAC line
2115VAC neutral
ECM Power
1N/C
2N/C
3N/C
4115VAC neutral
5115VAC line
ECM Control
1Common C1
2W/W1
3Common C2
4Delay tap select
5Cool tap select
6Y1
7Adjust tap select
8Output
9Return valve (heat pump only)
qP Humidistat (BK)
qQ Heat tap select
qW 24VAC (R)
qE 2nd stage heat (EM/W2)
qR 2nd stage cool (Y/Y2)
qT Fan (G)
qZ Output +
Electrical Connections (continued)
Legend
1 Diagnostic LED
2 Ambient temperature sensor
3 Return air temperature sensor
4 Supply air temperature sensor
5 Freeze protection temperature sensor
7 Supply water temperature sensor
8 A/C power
9 Pump motor
10 24VAC transformer secondary
11 24VAC transformer primary
12 ECM power
13 ECM control
12
11
10
9
8
7
5
4
3
2
1

Viessmann AirflowPLUS AH2A Technical Data
5680 010 - 10 Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.