zehnder Q450 ERV ComfoAir Comfort Vent User Manual

zehnder Q450 ERV ComfoAir Comfort Vent User Manual

Category: Air handling unit with heat recovery
Manufacturer: Zehnder Group Nederland B.V. Netherlands
Product name: ComfoAir Q450 ERV, Comfort Vent Q450 ERV
Specification: Airflow rate < 600 m3 /h Heat exchanger: Recuperative
This certificate was awarded based on the product meeting the following main criteria
Heat recovery rate ηHR ≥ 75 %
Specific electric power Pel,spec ≤ 0.45 Wh/m3 Leakage < 3 %
Comfort Supply air temperature ≥ 16.5 ◦C at outdoor air temperature of −10 ◦C

1. At an airflow of 93 m3
   /h, a heat recovery of ηHR = 91.00 % is reached.
   Due to the frost protection strategy at outdoor temperatures of -15 ◦C the air flow rate is reduced to about 280 m3 /h.

Zehnder Group Nederland B.V.
Lingenstraat 2, 8028 PM Zwolle, Netherlands
T +31 38 429 6911 | B info@zehnder-systems.de | Í http://www.comfosystems.de |

Passive House comfort criterion

A minimum supply air temperature of 16.5 ◦C is not maintained at an outdoor air temperature of -10
◦C. A heater coil for supply air heating should be installed.

Efficiency criterion (heat recovery rate)

The effective heat recovery rate is measured at a test facility using balanced mass flows of the outdoor and exhaust air. The boundary conditions for the measurement are documented in the testing procedure.

With

ηHR Heat recovery rate in % θETA Extract air temperature in ◦C θEHA Exhaust air temperature in ◦C
θODA Outdoor air temperature in ◦C Pel Electric power in W m˙ Mass flow in kg/h cp Specific heat capacity in W h/(kg K)

Heat recovery rate

ηHR = 83 %

Efficiency criterion (electric power)

The overall electrical power consumption of the device is measured at the test facility at an external pressure of 100 Pa (50 Pa, respectively, for the intake and outlet). This includes the general electrical
power consumption for operation and control but not for frost protection.

Specific electric power

Pel,spec = 0.21 Wh/m3

Efficiency ratio

The efficiency ratio provides information about the overall energy performance of the respective ventilation unit. It specifies the achieved reduction in ventilation heat losses by using a ventilation unit
with heat recovery rather than without.

Efficiency ratio L = 0.73

Leakage

The leakage airflow must not exceed 3 % of the average airflow of the unit’s operating range.

Internal leakage External leakage
0.51 % 0.23 %

Settings and airflow balance

It must be possible to adjust the balance of airflows at the unit itself (either between the exhaust and the outdoor airflows or between the supply and the extract airflows, if the unit is respectively placed inside or outside of the insulated thermal envelope of the building).
This unit is certified for airflow rates of 70–345 m3
/h. Balancing the airflow rates of the unit is possible.
The user should have at least all the following setting options:
Switching the system on and off.
Synchronized adjustment of the supply and extract airflows to basic ventilation (70–80 %),standard ventilation (100 %) and increased ventilation (130 %) with a clear indication of the current setting.
The device has a standby power consumption of 1.30 W. The target value of 1 W was exceeded.
The device should be equipped with an additional external switch so that it can be disconnected from the mains, if required.After a power failure, the device will automatically resume operation.

Acoustical testing

The required limit for the sound power level of the device is 35 dB(A) in order to limit the sound pressure level in the installation room. The sound level target value of less than 25 dB(A) in living spaces and less than 30 dB(A)in functional spaces must be ensured by installing commercial silencers.The
following sound power levels are met at an airflow rate of 347 m3 /h:

Device Outdoor Supply air Extract air Exhaust air
47.0 dB(A) 44.3 dB(A) 58.7 dB(A) 46.4 dB(A) 60.0 dB(A)

• The unit does not fulfil the requirements for the sound power level. The unit must therefore beinstalled acoustically separated from living areas.
• One example of suitable silencers for supply and extract air ducts is mentioned in the detailedtest report or can be obtained from the manufacturer. It is recommended to identify suitable silencers for each individual project.

Indoor air quality

This unit is to be equipped with the following filter qualities:

Outdoor air filter Extract air filter
ISO ePM1 50% ISO Coarse 60%

On the outdoor air side, the filter efficiency of ISO ePM1 50% (F7 according to EN 779) or better is recommended. For the extract air side, a filter efficiency of at least ISO Coarse 60% (G4 according to EN 779) is recommended. If not in standard configuration, the recommended filter is available as an accessory part.

Frost protection

Appropriate measures should be taken to prevent the heat exchanger and optional downstream hydraulic heater coil from getting damaged by frost during extreme winter temperatures (−15 ◦C). It must be ensured that the unit’s ventilation performance is not affected during frost protection cycles.

• Frost protection of the heat exchanger:X In order to protect the heat exchanger from freezing, the unit can optionally be equippedwith an electrical preheater of 2.2 kW. The pre heating power is controlled depending on theoutdoor air- and supply air temperature. In the measurement the preheater was acvitatedat an outdoor air temperature of about -12.9 ◦C. Due to the frost protection strategy, the airflow rate will be reduced to about 280 m3/h at an outdoor air temperature of -15 ◦C. In orderto ensure the upper air flow rate of 345 m3/h even at an outdoor air temperatur of -15 ◦C ,
  an additional preheater power or a post-heater is recommended. Frost protection of downstream hydraulic heater coils:X In order to protect a downstream hydraulic heater coil the device can be switched off assoon as the supply air temperature falls below about 10.8 ◦C.

ComfoAir Q450 ERV, Comfort Vent Q450 ERV

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