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Ventilation Unit Zehnder ComfoAir 550
TS108 - 1 2015.03.23
Use The ComfoAir 550 ventilation unit was developed for
residential and small commercial buildings. It combines maximum
comfort, simple operation and very high efficiency. The CA550 moves
up to 324 cfm of air at 0.80" wc
Efficiency The integrated cross-counterflow heat exchanger
achieves an efficiency of up to 84% (according to testing by the
Passive House Institute). For user comfort this means no unpleasant
cold drafts, because the supply air is heated nearly to room
temperature, even when external temperatures are very low.
Fans The supply fan and extract fan are driven by efficient DC
motors. Differential pressures in the supply and extract air
distribution systems can be adjusted thanks to individual control.
The especially quiet fans can be adjusted to the required
volumetric flow in 1% increments. The air volumes of the selectable
stages can be set to between 29 cfm and 324 cfm.
Filters The CA550 is equipped with two class G4 filters (MERV
7/8). An optional class F7 pollen filter (MERV 13) is available for
fresh air intake.
Installation The CA550 can be wall-mounted or floor-mounted
(with optional base). Connections for air and wiring are on the top
of the unit. The condensate drain is located on the bottom of the
unit.
Operation The CA550 is controlled by the ComfoSense control
unit, typically installed in the living area.
Maintenance Maintenance of the CA550 is limited to periodic
cleaning or replacement of the filters accessible from the front of
the unit. The exchanger core should be inspected and cleaned
annually (depending on outside air quality). Please see the unit
manual for additional servicing tasks.
Frost protection If the ventilation unit is operated without an
optional geothermal heat exchanger, condensate in the extract air
may freeze. The frost protection setting prevents this by variably
reducing the supply air volume. An optional, integrated electric
preheater warms incoming fresh air to prevent the heat exchanger
from freezing even at very low temperatures.
ComfoSense controller
Filter G4 Filter F7
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Ventilation Unit Zehnder ComfoAir 550
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Bypass During summer nights and in the “shoulder” seasons of
spring and fall with strong sunshine, the house can become too
warm, while the outside temperature remains pleasantly cool. In
such cases, heat removal by what is known as “free cooling” helps:
The CA550 is equipped with a standard automatic bypass for just
this purpose, and diverts 100% of the relatively warm extract air
from the heat exchanger, introducing cool supply air to the
space.
Options
• Humidity recovery with the Zehnder enthalpy exchangerWhen the
CA550 is fitted with an enthalpy exchanger core, the humidity from
the extracted air is partly transferred to the fresh supply air. In
this case, the process of drying out the house in dry winter months
is delayed. Additionally, there is no condensate that must be
drained from the ComfoAir. Therefore a condensation drain is not
necessary with an enthalpy exchanger.The Zehnder enthalpy exchanger
provides the ideal hygienic solution. Supply and extract air flows
are kept completely separate so there is no transfer of odors or
bacteria.
• Pollen filter (F7/MERV 13)A pollen filter installed in the
intake air line (upstream of the heat exchanger) keeps the inside
of the house pollen-free and reduces particulates, spores and germs
so occupants can breathe freely in times of increasing
allergies.
• Zehnder ComfoFond-L ground-coupled heat exchangerThe
ComfoFond-L uses the ground as passive storage via a brine(glycol)
loop. In summer, it transfers heat from intake air to the ground
and in winter it withdraws heat from the ground to warm the
incoming supply air.
• Open fire programThe ventilation system can be installed in a
home with a fireplace, wood stove, etc. but must be accounted for
in the control unit. By indicating in the ComfoSense control unit
the presence of a fireplace, negative pressure and possible
back-drafting of unpleasant fumes and/or harmful gases can be
avoided.
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Ventilation Unit Zehnder ComfoAir 550
TS108 - 3 2015.03.23
Benefits
• Comfort ventilation up to 324 cfm• Heat recovery with an
efficiency of up to 84% (according to PHI)• Moisture recovery with
optional Zehnder enthalpy exchanger• Low power consumption thanks
to DC motors• Automatic summer bypass• Frost protection function•
Quick, safe installation, maintenance and servicing• Simple
operation• Optional, integrated electric pre-heater• Can be coupled
with ComfoFond geothermal heat exchanger• Integrated controller for
geothermal heat exchanger• Filter replacement indicator• CO2
control (optional)• Relative humidity control (optional)
Article Numbers
L = supply air left
R= supply air right
VV = integrated electric pre-heater
Product Article Number Reference Number CA550 HRV-L 471 332 210
9252 CA550 HRV-R 471 332 215 9253
CA550 HRV-VV-L 471 332 230 9305
CA550 HRV-VV-R 471 332 235 9436
CA550 ERV-L 471 332 450 9254
CA550 ERV-R 471 332 455 9255
CA550 ERV-VV-L 471 338 540 9437
CA550 ERV-VV-R 471 338 545 9438
Accessories Article Number Reference Number 655 010 215 9257 642
300 140 9287
ComfoSense controller
ComfoAir 550 Assembly Base
Waterless P-Trap 990 201 330 9362
Filters Article Number Reference Number G4 (MERV 7/8) 1pc 006
040 202 9240 F7 (MERV 13) 1pc 006 040 250 9241
ZRectangle
ZLine
ZTypewritten TextExhaust Air Out
ZRectangle
ZTypewritten TextOut door Air In
ZLine
ZRectangle
ZLine
ZTypewritten TextSupply Air In
ZRectangle
ZLine
ZTypewritten TextReturn Air Out
ZRectangle
ZRectangle
ZTypewritten TextComfo Air 550 Left
ZTypewritten TextComfo Air 550 Right
ZRectangle
ZRectangle
ZRectangle
ZRectangle
ZTypewritten TextOut door Air In
ZTypewritten TextSupply Air In
ZTypewritten TextExhaust Air Out
ZTypewritten TextReturn Air Out
ZLine
ZLine
ZLine
ZLine
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Ventilation Unit Zehnder ComfoAir 550
TS108 - 4 2015.03.23
Technical Specifications
Heat Exchanger:
Fans:
Filters:
Polystyrene
ECM direct current, radial fans
(2) Class G4 (MERV 7/8), F7 (MERV 13) optional
Condensate Connection: 32mm
Air Duct Connection: 7” ID nominal (x4)
Electrical Connection: 230v, 50-60Hz
Acoustic Performance: Extract air (min – max): 28 - 63 dB(A)
Supply air (min – max): 35 - 79 dB(A)
Heat Recovery: 84% (according to PHI)
Volumetric Flow: 29cfm - 324cfm
Power Consumption: 13W – 350W
Dimensions: Height: 31.5”
Width: 28.5”
Depth: 22.4”
Weight: 103.6 pounds (47kg)
Versions: ComfoAir HRV 550-L
ComfoAir HRV 550-R
ComfoAir HRV 550-VV-L
ComfoAir HRV 550-VV-R
ComfoAir ERV 550-L
ComfoAir ERV 550-R
ComfoAir ERV 550-VV-L
ComfoAir ERV 550-VV-R
Manufacturer: Zehnder Group Nederland B.V.
Lingenstraat 2 8028 PM Zwolle
NETHERLANDS
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TS108 - 5
28.5" 22.2"
7.9"
7.0"
10.4"
Ø 32
8.2"
19.3"
8.2"
31.5
"22
.4"
4.9"
11.1
"
19.7
"
31.5
"
31.1
"
Space requirements for electrical connection
Space requirements for electrical connection
Space requirements for servicing
Location of Condensate drain right-hand unit
Location of Condensate drain left-hand unit
Ventilation Unit Zehnder ComfoAir 550
Dimensional drawing
2015.03.23
Floor
10"
min
.
ZLine
ZLine
ZLine
ZLine
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987654321
Ventilation unit Zehnder ComfoAir 550
"WC4.01
3.61
3.21
2.81
2.41
2.00
1.61
1.20
0.80
0.40
0 59 118 177 235 294 353 412 471 530 cfm
TS108 - 6
Stage Speed Air volume Pressure Power
consumption
Current
consumption
COS φ Installed noise level
Weight
Qv Δ P st Extract air Supply air
% cfm " WC W A (-) dB(A) dB(A) lb
ComfoAir 550Zehnder
(1) Absent 15% 29 0.02 13 0.12 0.47 28 35 103.6
(2) 30% 82 0.12 26 0.22 0.51 38 50
(3) Stage 1 40% 106 0.24 41 0.35 0.51 44 58
(4) 50% 132 0.40 69 0.57 0.53 48 63
(5) 60% 165 0.60 110 0.86 0.56 52 67
(6) Stage 2 70% 194 0.86 160 1.21 0.57 55 71
(7) 80% 224 1.14 220 1.65 0.58 59 74
(8) 90% 253 1.45 310 2.22 0.61 63 78
(9) Stage 3 100% 271 1.65 350 2.459 0.62 63 79
Zehnder ComfoAir 550
2015.03.23
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Zehnder ComfoAir 550Ventilation unit
Sound, supply air
Ventilation unit
Type Speed 125 Hz
Acoustic performance at the intake air connection
250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz
ComfoAir 550 9 78 78 79 69 70 66 53
ComfoAir 550 8 78 77 77 67 69 65 52
ComfoAir 550 7 75 75 73 66 66 61 48
ComfoAir 550 6 73 72 70 63 63 56 43
ComfoAir 550 5 70 70 66 58 58 51 38
ComfoAir 550 4 67 68 61 53 53 44 32
ComfoAir 550 3 63 65 55 45 44 35 24
ComfoAir 550 2 56 55 47 37 37 25 14
ComfoAir 550 1 45 39 29 26 21 9 12
Sound, extract air
Ventilation unit Acoustic performance at the extract air
connection
Type Speed 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000
Hz
ComfoAir 550 9 67 66 63 51 49 42 33
ComfoAir 550 8 66 65 64 50 47 41 3
ComfoAir 550 7 63 62 60 48 45 37 27
ComfoAir 550 6 60 60 54 45 41 33 23
ComfoAir 550 5 57 57 50 41 37 28 20
ComfoAir 550 4 52 55 46 36 32 21 18
ComfoAir 550 3 46 51 38 29 25 14 13
ComfoAir 550 2 45 44 33 27 18 8 11
ComfoAir 550 1 40 29 22 20 3 6 13
Sound, unit emission
Ventilation unit
Type Speed
Acoustic performance at the extract air connection
125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz db(A)
ComfoAir 550 9 57 56 53 46 44 54
ComfoAir 550 8 56 55 52 45 43 53
ComfoAir 550 7 53 52 50 42 40 50
ComfoAir 550 6 50 49 48 39 36 48
ComfoAir 550 5 47 47 46 34 32 45
ComfoAir 550 4 44 45 39 30 27 41
ComfoAir 550 3 38 41 32 24 21 35
ComfoAir 550 2 37 36 27 20 15 28
ComfoAir 550 1 26 29 20 19 17 25
TS108 - 7 2015.03.23
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Ventilation unit Zehnder ComfoAir 550
Zehnder America, Inc. · 540 Portsmouth Ave. · Greenland, NH
03840 · USA
T +1 603 422 6700 · Toll Free: 888 778 6701 · F +1 603 422
9611
[email protected] · www.zehnderamerica.com
TS108 - 8 2015.03.23
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