System air HRU 300 User manual

User's Manual
HRU 300/550/900
New Zealand

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This user’s manual is a main operating document intended for technical, maintenance, and operating staff.
The manual contains information about purpose, technical details, operating principle, design, and installation of the HRU
300/550/900 unit and all its modications.
Technical and maintenance staff must have theoretical and practical training in the eld of ventilation systems and should
be able to work in accordance with workplace safety rules as well as construction norms and standards applicable in the
territory of the country.
Safety requirements ..................................................................................................................3
Purpose........................................................................................................................................5
Delivery set .................................................................................................................................5
Designation key..........................................................................................................................5
Technical data .............................................................................................................................6
Design and functioning .............................................................................................................8
Mounting and set-up.................................................................................................................9
Connection to power mains .....................................................................................................11
Technical maintenance..............................................................................................................12
Troubleshooting..........................................................................................................................13
Storage and transportation regulations .................................................................................13
CONTENTS

HRU 300/500/900 User Manual 3
SAFETY REQUIREMENTS
• Please read the user’s manual carefully prior to installing and operating the unit.
• All user’s manual requirements as well as the provisions of all the applicable local and
national construction, electrical, and technical norms and standards must be observed
when installing and operating the unit.
• The warnings contained in the user’s manual must be considered most seriously since they
contain vital personal safety information.
• Failure to follow the rules and safety precautions noted in this user’s manual may result in
an injury or unit damage.
• After a careful reading of the manual, keep it for the entire service life of the unit.
• While transferring the unit control, the user’s manual must be turned over to the receiving
operator.
UNIT INSTALLATION AND OPERATION SAFETY PRECAUTIONS
• Disconnect the unit from
power mains prior to any
installation operations.
• Unpack the unit with care.
• The unit must be grounded!
• While installing the unit,
follow the safety regulations
specic to the use of electric
tools.
• Do not change the power
cable length at your own
discretion.
• Do not bend the power cable.
• Avoid damaging the power
cable.
• Do not put any foreign objects
on the power cable.
• Do not lay the power cable of
the unit in close proximity to
heating equipment.
• Do not use damaged
equipment or cables when
connecting the unit to
power mains.
• Do not operate the unit
outside the temperature
range stated in the user’s
manual.
• Do not operate the unit in
aggressive or explosive
environments.

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• Do not touch the unit controls
with wet hands.
• Do not carry out the
installation and maintenance
operations with wet hands.
• Do not wash the unit with
water.
• Protect the electric parts of
the unit against ingress of
water.
• Do not allow children to
operate the unit.
• The unit is allowed to be
used by children aged
from 8 years oldand above
and persons with reduced
physical, sensory, or mental
capabilities or no experience
and knowledge provided
that they have been given
supervision or instruction
regarding safe use of the
unit and understand the risks
involved.
• Disconnect the unit from
power mains prior to any
technical maintenance.
• Do not store any explosive or
highly ammable substances
in close proximity to the unit.
• When the unit generates
unusual sounds, odour, or
emits smoke, disconnect
it from power supply and
contact the Seller.
• Do not open the unit during
operation.
• Do not direct the air ow
produced by the unit towards
open ame or ignition
sources.
• Do not block the air duct
when the unit is switched on.
• In case of continuous
operation of the unit,
periodically check the security
of mounting.
• Do not sit on the unit and
avoid placing foreign objects
on it.
• Use the unit only for its
intended purpose.
THE PRODUCT MUST BE DISPOSED SEPARATELY AT THE END OF ITS SERVICE LIFE.
DO NOT DISPOSE THE UNIT AS UNSORTED DOMESTIC WASTE.

HRU 300/500/900 User Manual 5
PURPOSE
The unit is designed to ensure continuous mechanical air exchange in houses, ofces, hotels, cafes, conference halls, and
other utility and public spaces as well as to recover the heat energy contained in the air extracted from the premises to
warm up the ltered stream of intake air.
The unit is not intended for organizing ventilation in swimming pools, saunas, greenhouses, summer gardens, and other
spaces with high humidity.
Due to the ability to save heating energy by means of energy recovery, the unit is an important element of energy-
efcient premises.
The unit is a component part and is not designed for stand-alone operation. It is rated for continuous operation.
Transported air must not contain any ammable or explosive mixtures, evaporation of chemicals, sticky substances, brous
materials, coarse dust, soot and oil particles or environments favourable for the formation of hazardous substances (toxic
substances, dust, pathogenic germs).
THE UNIT SHOULD NOT BE OPERATED BY CHILDREN OR PERSONS WITH REDUCED PHYSICAL,
MENTAL, OR SENSORY CAPACITIES, OR THOSE WITHOUT THE APPROPRIATE TRAINING.
THE UNIT MUST BE INSTALLED AND CONNECTED ONLY BY PROPERLY QUALIFIED PERSONNEL
AFTER THE APPROPRIATE BRIEFING.
THE CHOICE OF UNIT INSTALLATION LOCATION MUST PREVENT UNAUTHORISED ACCESS BY
UNATTENDED CHILDREN.
Name Number
Unit 1 pc.
User's manual 1 pc.
Packing box 1 pc.
HRU 550 P B E EC LA21 DTV
Differential pressure switches
_ – no differential pressure switches
DTV – pre-installed differential pressure switches
Control panel
A21
Design
L – left-hand; R – right-hand
Motor type
EC – electronically commutated motor
Heater type
E – electric heater
Additional components
B – bypass
Mounting option
P – suspended mounting
Air ow [m3/h]
Unit series
VUT – heat recovery air handling unit
VUE – energy recovery air handling unit
DELIVERY SET
DESIGNATION KEY

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TECHNICAL DATA
The unit is designed for indoor application with the ambient temperature ranging from +1 °C up to +40 °C and relative
humidity up to 60 % without condensation. In cold, damp rooms, there is a possibility of freezing or condensation inside
and outside the casing.
In order to prevent condensation on the internal walls of the unit, it is necessary that the surface temperature of the
casing is 2-3 °C above the dew point temperature of the transported air.
The unit should be operated continuously, and in cases where ventilation is not necessary, reduce the air ow of the fans
to a minimum (20%). This will ensure a favorable indoor climate and reduce the amount of condensation inside the unit,
which can damage electronic components. Never use the unit for dehumidication, for example, of new buildings.
The unit is rated as a Class I electrical appliance.
Hazardous parts access and water ingress protection rating:
IP22 for the unit connected to the air ducts
IP44 for the unit motors
The unit design is constantly being improved, thus some models may be slightly different from those described in this
manual.
HRU 300
øD
B1
H
H1
L
L1
B2
B5
B3
B
B4
ø d
ø14
TECHNICAL DATA
MODEL HRU 300 HRU 550 HRU 900
Voltage [V/50 (60) Hz] 1~ 230
Maximum fan power [W] 180 297 442
Power of the integrated electric heater [W] 1500 2000 3300
Maximum air ow [W] 1680 2297 3742
Maximum unit current without a heater [A] 1.4 2.4 3.1
Current of the integrated electric heater [A] 6.5 8.7 14.3
Maximum current of the unit with an electric heater [A] 7.9 11.1 17.4
Air ow [m3/h] 340 620 1030
Rotation speed [min-1] 3270 3100 2720
Noise level, 3 m [dBA] 27 30 33
Transported air temperature [°С] -25...+40
Casing material Aluzinc
Insulation, mineral wool [mm] 20
Filtering class of the extract lter G4
Filtering class of the supply lter G4 (optional – F7)
Connecting air duct diameter [mm] 160 200 250
Weight [kg] 44 67 111
Heat recovery efciency [%] 72...90/69...87 78...90/69...87 75...88/69...85
Heat exchanger type Counter-ow
Heat exchanger material Polystyrene/Enthalpy
SEC class A A A
*The VUE units are equipped with an enthalpy heat exchanger and do not require condensate drainage.

HRU 300/500/900 User Manual 7
HRU 550
øD
B1
H
H1
L
L1
B5
B3B2
B
B4
ø d
ø14
HRU 900
L1
ø d
øD
B2B1 H
H1
L
B4B3
B
B5
ø14
Dimensions [mm]
Model Ø D В В1 В2 ВЗ В4 В5 Н Н1 L L1 Ø d
HRU 300 157 485 415 560 135 214 577 290 152 1238 1290 9
HRU 550 197 827 713 294 188 345 960 280 160 1238 1290 9
HRU 900 247 1351 607 607 522 607 1485 318 147 1349 1402 9

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The unit operates as follows:
Warm stale extract air from the room ows through the air ducts to the unit, where it is ltered, then air ows through the
heat exchanger and is exhausted outside by the extract fan through the air ducts.
Clean cold air from outside is moved by the supply fan to the unit, where from it is directed to the supply lter. Then
ltered air ows through the heat exchanger and moves to the room through the air ducts.
Heat energy of warm extract air is transferred to clean intake fresh air from outside and warms it up.
Heat recovery minimizes thermal energy losses, energy demand and operating costs for air heating accordingly.
The unit is equipped with a detachable service panel for repair works and preventive maintenance and a cover enabling
access to the control system components.
OPERATING LOGIC
8
VUT/VUE 300/550/900 PBE EC
www.ventilation-system.com
The unit operates as follows:
Warm stale extract air from the room flows through the air ducts to the unit, where it is filtered, then air flows through the heat exchanger
and is exhausted outside by the extract fan through the air ducts.
Clean cold air from outside is moved by the supply fan to the unit, where from it is directed to the supply filter. Then filtered air flows
through the heat exchanger and moves to the room through the air ducts.
Heat energy of warm extract air is transferred to clean intake fresh air from outside and warms it up.
Heat recovery minimizes thermal energy losses, energy demand and operating costs for air heating accordingly.
The unit is equipped with a detachable service panel for repair works and preventive maintenance and a cover enabling access to the
control system components.
OPERATING LOGIC
Supply air
Extract air
Exhaust air
Intake air
The basic unit delivery set includes a remote control panel for connection to the control system inside the unit casing.
The unit comprises a supply and an extract centrifugal single-inlet fan with forward curved blades and maintenance-free EC motors with
external rotor and built-in overheat protection, a plate counter-flow heat exchanger and an electric heater.
The supply G4 filter cleans supply air flow and prevents contamination of the unit parts.
The extract G4 filter prevents contamination of the unit components.
Some condensate may be generated during heat recovery.
The condensed fluid is collected in the drain pan and is removed from the unit through the drain hoses.
UNIT DESIGN
Extract fan
Supply lter
Extract lter
Bypass
Supply fan
Drain pan
Electric heater
Control unit
Heat exchanger
Dierential
pressure switch
Dierential
pressure switch
DESIGN AND OPERATING PRINCIPLE
Supply air
Extract air
Exhaust air
Intake air
The basic unit delivery set includes a remote control panel for connection to the control system inside the unit casing.
The unit comprises a supply and an extract centrifugal single-inlet fan with forward curved blades and maintenance-free
EC motors with external rotor and built-in overheat protection, a plate counter-ow heat exchanger and an electric heater.
The supply G4 lter cleans supply air ow and prevents contamination of the unit parts.
The extract G4 lter prevents contamination of the unit components.
Some condensate may be generated during heat recovery.
The condensed uid is collected in the drain pan and is removed from the unit through the drain hoses.
UNIT DESIGN
Extract fan
Supply lter
Extract lter
Bypass
Supply fan
Drain pan
Electric heater
Control unit
Heat exchanger
Dierential
pressure switch
Dierential
pressure switch
DESIGN AND OPERATING PRINCIPLE

HRU 300/500/900 User Manual 9
While mounting the unit provide enough space for its servicing and maintenance.
Minimum distance required to
access the unit
Control unit
Type HRU 300 HRU 550 HRU 900
min A [mm] 500 850 800
UNIT MOUNTING
The unit is designed for suspended mounting by means of the threaded rod xed in the threaded dowel.
Washer
Nut
Vibration-absorbing
rubber
Nut and
lock-nut
Example
To attain the best performance of the unit and to minimise turbulence-induced air pressure losses, while mounting
connect a straight air duct section on both sides of the unit.
Minimum straight air duct length:
• equal to 1 air duct diameter on intake side.
• equal to 3 air duct diameters on outlet side.
If the air ducts are not connected or the connected air ducts are too short, protect the unit parts from ingress of foreign
objects by covering the spigots with a protecting grille or other protecting device with mesh width not more than 12.5 mm
to prevent uncontrollable access to the fans.
The unit is available with the service side located on the left and on the right of the unit to facilitate mounting and provide
minimum service access.
MOUNTING AND SET-UP
READ THE USER'S MANUAL BEFORE INSTALLING THE UNIT.

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Supply air Extract air
Exhaust air Intake air
Supply air
Extract air
Exhaust air Intake air
Right-hand modification Left-hand modification
Service side
Service side
(bottom view) (bottom view)
Safety precautions
The unit is designed for mounting on a rigid and stable structure.
The unit is mounted with anchor bolts. Make sure that a mounting construction has sufcient load capacity matching the
unit weight.
Otherwise reinforce the installation place by beams, etc. If the threaded bolts used for the unit mounting are too short,
the unit can generate abnormal noise and resonate with the ceiling. The suspended bolts must be long enough to prevent
resonating.
If the unit connection place to the spiral seam duct is supposed to be the source of abnormal noise, replace the spiral
seam air duct with the exible one. Optionally the exible connectors may be used to prevent resonating.
CONDENSATE DRAINAGE
The condensate drain pan in the heat recovery section is equipped with two hoses for extracting the condensed uid
outside the unit.
Connect the pipe, U-trap (not included in the delivery set) and sewage collection system with metal, plastic or rubber
connecting pipes.
The pipe slope downwards must be at least 3°. Fill up the system with water before connecting the unit to power mains!
The U-trap must always be lled with water during the unit operation. Make sure that the water ows freely into the
sewage collection system or otherwise condensed water may build up in the unit during the heat exchanger operation and
cause equipment failure and condensed water outow into the premises. The condensate drainage system is designed for
normal operation in premises with air temperatures above 0 °C. If the expected ambient air temperatures are below 0 °C,
the condensate drainage system must be equipped with heat insulation and pre-heating facilities.
Drainage removal is not required for VUE modications, since they are equipped with an enthalpy heat exchanger.
min 3°
Drain pipe
Sewage system
Pipe
Pipe
U-trap
175 mm
min
70 mm
min

HRU 300/500/900 User Manual 11
DISCONNECT THE UNIT FROM POWER MAINS PRIOR TO ANY OPERATIONS.
THE UNIT MUST BE CONNECTED TO POWER MAINS BY A QUALIFIED ELECTRICIAN.
THE RATED ELECTRICAL PARAMETERS OF THE UNIT ARE GIVEN ON THE
MANUFACTURER'S LABEL.
ANY TAMPERING WITH THE INTERNAL CONNECTIONS IS PROHIBITED
AND WILL VOID THE WARRANTY.
The unit is rated for connection to single-phase AC 230 V/50 (60) Hz power mains. For electric installations use insulated
durable heat-resistant conductors (cables, wires) with the minimum wire cross section 2.5 mm2.
The above conductor cross section value is tentative and in practice must be based on the wire type, maximum
permissible heating temperature, insulation, length and installation method.
Connect the unit to power mains through the external automatic circuit breaker with magnetic trip integrated into the xed
wiring system with the rated current not below the rated current consumption.
The terminal block with the prewired control unit is located inside the control unit compartment.
To connect the power and the ground cable, route the cables through the airtight electric lead-in in the unit casing and
connect these to the terminal block. The wiring diagram for connection of the air handling unit to power supply is on the
back side of the lid.
CONNECTION TO POWER MAINS
HRU 300-900
L1
1
N
2
PE
3
X1
NC
1
C
2
NO
3
C
4
NO
5
C
6
GND
1
0-10V
2
24V
3 4
X2
GND 0-10V 10V
5 6
GND A B 24V
78910
230V/2A230V/2A 230V/2A
230V/1PH
PK1 PK2 PK3
CO2 IN 10V IN CONTROL PANEL
HRU300 - 900
DESIGNATION NAME
CONTACT FROM FIRE PANELPK1 2 X 0.75 NC 2A, 230V, AC
CABLE TYPE CONTACT TYPE SWITCH VOLTAGE
FIREPLACE MODE INPUTPK2 2 X 0.75 NO 2A, 230V, AC
PK3 2 X 0.75 NO 2A, 230V, ACBOOST MODE INPUT
X1
DESIGNATION NAME
CO2 SENSOR 0-10VCO2 IN CAT ANALOGUE 0-10V, DC
CABLE TYPE SIGNAL TYPE SIGNAL VOLTAGE
EXTERNAL 0-10V10V IN
PANEL MODBUS 24V, DCCONTROL PANEL CONNECTION
X2
ANALOGUE 0-10V, DCCAT
CAT
— ELECTRIC SHOCK HAZARD!

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The recommended maintenance periodicity is 3-4 times per year. The maintenance and servicing routines include regular
cleaning and the following operations:
1. Filter maintenance (3-4 times per year).
Dirty lters increase air resistance in the system and reduce supply air volume. Clean the lters as these get dirty, but at
least 3-4 times a year. The lter can be cleaned with a vacuum cleaner or replaced with a new one. New lters can be
purchased from the unit seller.
2. Heat exchanger maintenance (once a year).
Even regular lter technical maintenance may not completely prevent dirt accumulation on the heat exchanger.
To maintain high heat recovery efciency, regular cleaning is required. To clean the heat exchanger, remove it from the
unit and clean it with compressed air or a vacuum cleaner. In case of heavy soiling, the heat exchanger can be washed
with water.
Then install the heat exchanger back to the unit.
3. Fan inspection (once a year).
Even regular technical maintenance of the lters and the heat exchanger may not completely prevent dust accumulation in
the fans which reduces the fan capacity and impairs supply air volume into the premises.
The fans must be cleaned by a service technician.
4. Condensate drain maintenance (4 times a year).
The drain pipes may get clogged with the extracted particles.
Pour some water inside the drain pan and check the pipe for clogging. Clean the U-trap and drain pipe if required.
5. Air intake maintenance (twice a year).
Leaves and other pollutions can clog the supply air grille and reduce the unit performance and supply air volume.
Check the supply grille twice per year and clean it as required.
6. Duct system maintenance (every 5 years).
Even regular fullling of all the prescribed above maintenance operations may not completely prevent dust accumulation
in the air ducts which reduces the air quality and the unit performance. The air duct maintenance includes regular cleaning
or replacement.
TECHNICAL MAINTENANCE
DISCONNECT THE UNIT FROM POWER SUPPLY BEFORE ANY MAINTENANCE OPERATIONS!

HRU 300/500/900 User Manual 13
STORAGE AND TRANSPORTATION REGULATIONS
• Store the unit in the manufacturer’s original packaging box in a dry closed ventilated premise with temperature range
+5 ˚С...+40 ˚С and relative humidity up to 70 %.
• Storage environment must not contain aggressive vapors and chemical mixtures provoking corrosion, insulation, and
sealing deformation.
• Use suitable hoist machinery for handling and storage operations to prevent possible damage to the unit.
• Follow the handling requirements applicable for the particular type of cargo.
• The unit can be carried in the original packaging by any mode of transport provided proper protection against
precipitation and mechanical damage. The unit must be transported only in the working position.
• Avoid sharp blows, scratches, or rough handling during loading and unloading.
• Prior to the initial power-up after transportation at low temperatures, allow the unit to warm up at operating
temperature for at least 3-4 hours.
TROUBLESHOOTING
IF UNIDENTIFIED NOISES OR ODOURS SHOULD ARISE AND IN CASE OF DEFORMATION OF
ELEMENTS, VIBRATION, TERMINATION OF AIR SUPPLY/EXTRACTION OR REDUCED SYSTEM
PERFORMANCE, IMMEDIATELY DISCONNECT THE UNIT FROM POWER SUPPLY AND CONTACT
THE SELLER FOR THE VENTILATION SYSTEM DIAGNOSTICSDIAGNOSTICS MUST BE CARRIED
OUT BY QUALIFIED SPECIALISTS
POSSIBLE FAULTS AND TROUBLESHOOTING
Problem Possible reasons Troubleshooting
The fan (-s) does (do)
not start up during the
unit start-up.
No power supply. Make sure the unit is properly connected to power
mains, otherwise troubleshoot a connection error.
The mode is set in which the fans are off. Change the operating mode using the control panel.
Low air ow.
Low set fan speed. Set higher speed.
The lters, the fans or the heat exchanger are
contaminated.
Clean or replace the lters, clean the fans and the heat
exchanger.
The elements of the ventilation system (air ducts,
diffusers, louver shutters, grilles) are soiled,
damaged or closed.
Clean or replace the ventilation system elements (air
ducts, diffusers, louver shutters, grilles).
Low supply air
temperature. The extract lter is soiled. Clean or replace the extract lter.
High noise, vibration. The fan or casing screw connection is loose. Tighten the screw connection of the fans or the casing
against stop.
No anti-vibration dampers on the spigots. Install anti-vibration rubber mounts.
Water leakage (only for
the VUT units).
The drain line is clogged, damaged or mounted
wrong.
Clean the drain line, if necessary. Check the drain line
slant, inspect the U-trap and make sure the drain line
is equipped with frost protection.
If the troubleshooting steps are unsuccessful,
contact the service department or the seller of the product.
In the event of malfunctions not described in the table,
contact the service department or the seller of the product.

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HRU 300/500/900 User Manual 15

Systemair New Zealand Ltd
Ph 0800 100 326
[e-mail]
www.systemair.nz
Systemair NZ · April 2023 · SYSNZ10010