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SCHOOLAIR-V 4L

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Cross flow heat recovery unit

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Tested to VDI 6022

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Water connections

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Filter change

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Levelling foot

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SCHOOLAIR-V-4L

Supply and extract air unit with switchover option to secondary air operation, including cross flow heat recovery unit and heat exchanger for vertical installation on the façade

Ready-to-operate decentralised ventilation unit that provides good comfort levels and is used for the ventilation of internal spaces such as classrooms, conference rooms and day nurseries

  • Acoustically optimised EC fans with low specific fan power, SFP = 0 to EN 16798-3
  • Cross flow heat recovery unit (heat recovery efficiency 52 %)
  • Highly efficient heat exchanger for heating and cooling as a 4-pipe system
  • Heat exchanger connection is on the right when seen from the room
  • Condensate drip tray with or without condensate drain
  • Heat recovery all year round (optional)
  • Reduced fine dust and pollen contamination due to integral filters that conform to VDI 6022 – filter class ISO ePM1 65% and extract air ISO coarse 75%
  • Easy filter change, no tools required
  • Motorised shut-off dampers, normally closed (NC)
  • Installation without interruption of school operations

Optional equipment and accessories

  • Modular control system FSL-CONTROL III, specially for decentralised ventilation systems
  • Wood panelling as outer casing in various colours, with TROX ventilation grilles for supply air and extract air (assembly kit)


Information technique

Function, Technical data, Quick sizing, Specification text, Order code

  • Function
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE

Functional description

Decentralised supply and extract air units ventilate the room and cover the cooling and heating load in accordance with the technical data. An EC centrifugal fan takes in the outdoor air which then flows through the motorised shut-off damper and the outdoor air filter. The outdoor air then flows through the cross flow heat recovery unit, which can be switched off in energy efficient operating situations. Before the supply air flows into the room like displacement air, it is heated or cooled in the heat exchanger if required (optional for 4-pipe units).The extract air first passes through the extract air filter, then flows through the heat recovery unit, the extract air fan and the motorised shut-off damper before it is discharged to the outside as exhaust air. If the indoor air quality is sufficient, the FSL-CONTROL III control system switches to energy-efficient secondary air mode by closing the outdoor air dampers. The control system compares the room air quality setpoint value to the actual value measured by the CO2 sensor and switches automatically between outdoor air and secondary air operation. In case of a power failure, the outdoor air and exhaust air dampers are closed to ensure fire protection, frost protection and to avoid draughts. This is ensured by a capacitor in each actuator. Near the external wall, the supply air is discharged into the room with a medium velocity between 0.5 and 0.8 m/s. Due to the induction effect, the supply air velocity is rapidly reduced after entering the room. As a result, in cooling mode, the supply air spreads out like displacement flow over the entire floor area. Near heat sources such as people or equipment, a lift current is formed by natural convection, so that the air is exchanged primarily in these areas.

Width

397 mm

Height

2350 mm

Depth

359 mm

Volume flow rate

150, 200, 250 m³/h (boost 320 m³/h)

Nominal volume flow rate

250 m³/h

Sound power level

31 – 46 dB(A)

Heat recovery efficiency

52 %

Maximum operating pressure, water side6 bar
Maximum operating temperature

75 °C

Supply voltage230 V AC ±10 %, 50/60 Hz
Power rating

226 VA

Weight

85 kg

X-CUBE/SCHOOLAIR-V (example 4-pipe version, active heating)

Supply air flow rate

m³/h

150

200

250

320

Total cooling capacity

W

690

920

1150

1420

Room cooling capacity

W

401

534

668

812

Air temperature inside the unit

°C

32

32

32

32

Relative humidity

%

40

40

40

40

Water content of the dry air

kg

11.9

11.9

11.9

11.9

Supply air temperature

°C

18

18

18

18.4

Condensation

g/h

0

0

0

0

Chilled water flow rate

l/h

80

140

190

220

Water temperature, inlet

°C

16

16

16

16

Water temperature, outlet

°C

23.4

21.6

21.2

21.6

Water side pressure drop

kPa

2.5

6

10

12.5

Total heating capacity

W

2770

3580

4340

5200

Room heating capacity

W

842

1029

1102

1176

Air temperature inside the unit

°C

-12

-12

-12

-12

Supply air temperature

°C

36.8

35.4

33.2

31.0

Hot water flow rate

l/h

100

150

200

230

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

35.9

39.2

41.1

40.3

Water side pressure drop

kPa

3.5

7

11.5

15

Sound power level LWA

dB(A)

31

36

41

46

Sound pressure level with 8 dB system attenuation

dB(A)

23

28

33

38

Active power Pel

W

24

34

44

70

Air-side data Cooling mode:

  • Temperature/relative humidity outdoor air: 32 °C/40 %
  • Temperature/relative humidity indoor air: 26 °C/50 %

Air-side data Heating mode:

  • Temperature/relative humidity outdoor air: -12 °C/90 %
  • Temperature/relative humidity indoor air: 20 °C/35 %

X-CUBE/SCHOOLAIR-V (example 4-pipe construction – isothermal supply air)

Supply air flow rate

m³/h

150

200

250

320

Total cooling capacity

W

790

1050

1300

1570

Room cooling capacity

W

411

534

668

759

Air temperature inside the unit

°C

34

34

34

34

Relative humidity

%

36

36

36

36

Water content of the dry air

kg

11.9

11.9

11.9

11.9

Supply air temperature

°C

17.8

18

18

18.9

Condensation

g/h

0

0

0

0

Chilled water flow rate

l/h

100

160

160

200

Water temperature, inlet

°C

16

16

16

16

Water temperature, outlet

°C

22.8

21.6

21.6

22.8

Water side pressure drop

kPa

3.5

7

11

11

Total heating capacity

W

2020

2730

3430

4150

Room heating capacity

W

130

214

276

150

Air temperature inside the unit

°C

-12

-12

-12

-12

Supply air temperature

°C

23.6

24.2

24.3

22.4

Hot water flow rate

l/h

60

90

130

160

Water temperature, inlet

°C

50

50

50

50

Water temperature, outlet

°C

20.9

23.7

27.1

27.5

Water side pressure drop

kPa

2

3.5

6

8.5

Sound power level LWA

dB(A)

31

36

41

46

Sound pressure level with 8 dB system attenuation

dB(A)

23

28

33

38

Active power Pel

W

24

34

44

70

Air-side data Cooling mode:

  • Temperature/relative humidity outdoor air: 34 °C/36 %
  • Temperature/relative humidity room air: 26 °C/50 %

Air-side data Heating mode:

  • Temperature/relative humidity outdoor air: -12 °C/90 %
  • Temperature/relative humidity room air: 21 °C/35 %

Functional description

Decentralised supply and extract air units ventilate the room and cover the cooling and heating load in accordance with the technical data. An EC centrifugal fan takes in the outdoor air which then flows through the motorised shut-off damper and the outdoor air filter.

The outdoor air then flows through the cross flow heat recovery unit, which can be switched off in energy efficient operating situations. Before the supply air flows into the room like displacement air, it is heated or cooled in the heat exchanger if required (optional for 4-pipe units).
The extract air first passes through the extract air filter, then flows through the heat recovery unit, the extract air fan and the motorised shut-off damper before it is discharged to the outside as exhaust air.

If the indoor air quality is sufficient, the FSL-CONTROL III control system switches to energy-efficient secondary air mode by closing the outdoor air dampers. The control system compares the room air quality setpoint value to the actual value measured by the COsensor and switches automatically between outdoor air and secondary air operation.

In case of a power failure, the outdoor air and exhaust air dampers are closed to ensure fire protection, frost protection and to avoid draughts. This is ensured by a capacitor in each actuator.

Near the external wall, the supply air is discharged into the room with a medium velocity between 0.5 and 0.8 m/s. Due to the induction effect, the supply air velocity is rapidly reduced after entering the room. As a result, in cooling mode, the supply air spreads out like displacement flow over the entire floor area. Near heat sources such as people or equipment, a lift current is formed by natural convection, so that the air is exchanged primarily in these areas.

FSL-CONTROL III controller

Including control system FSL-CONTROL III, as described below:

FSL-CONTROL III is described as a stand-alone single room control system with a simple timer. Optional expansions, such as integration into an on-site MCE/BACS via Modbus TCP, Modbus RTU, BACnet MS/TP or BACnet IP, humidity sensors, return temperature sensors, electromotive valve actuators or pressure-independent control valves, are included in the delivery programme, but must be exchanged for the standard components in the following description. A room temperature signal is also required. Various room control panels and sensors are available to provide this signal. Suitable optional equipment can be found after the following standard equipment for stand-alone operation. - please refer to: Optional control accessories. We recommend commissioning by TROX. You will find related text modules below.

TROX control module FSL-CONTROL III (order code ...-C3-MA ...):

  • Single room controller to be mounted on a DIN mounting rail in the unit or in a separate control equipment box
  • 42 digital or analogue inputs and outputs
  • A MicroSD card (at least 2 GB storage space) is integrated as a flash memory medium. The trend data are stored there and can be retrieved via the RJ45 socket
  • Factory-equipped with a software package for master units specially developed for decentralised ventilation units. The software enables simple master-slave communication via Modbus RTU
  • Up to 10 slave devices can be connected to one master device
  • The software provides 3 types of operation (Off, Automatic and Manual), 3 operating modes (Occupied, Unoccupied and Standby) and 4 operating mode overrides (Boost, Class, Night Ventilation and Fan Forced Circuit)
  • Basic distinction between room temperature control by controlling heating and cooling valves or continuous bypass damper or supply air temperature control for isothermal ventilation operation
  • CO2 guided air quality control
  • Heat recovery all year round
  • Filter monitoring
  • Configurable DI for on-site connection of presence detectors, window contacts, holiday switching, etc.
  • Alarm messages: Type A (shutdowns) and Type B (notifications)

Real time clock (RTC)

Real Time Clock (RTC/real time clock) (order code ...-T/...):

  • Component of the Master Software Package
  • Enables a simple timer
    • 7 days with 10 switching points each
    • Automatic summer / winter time changeover
    • Temporal activation of night purge

CO2 sensor

COsensor (order code…/C/…):

  • Sensor arranged in the extract air intake of the master unit for recording the indoor air quality and corresponding control of the outdoor air flow rate
  • Measurement via an NDIR sensor, which works on an infrared basis and compensates for any contamination by its 2-beam measurement principle
  • Measuring range 0 – 2000 ppm

Supply air temperature sensor

Supply air temperature sensor (order code .../Z/...):

  • Supply air temperature sensor with NTC thermistor, 10 kΩ at 25 °C, measuring range -35 to 105 °C
  • Very short response time due to perforated measuring tip

Outdoor air temperature sensor

Outdoor air temperature sensor (order code .../A/...):

  • Outdoor air temperature sensor with NTC thermistor, 10 kΩ at 25 °C, measuring range -35 to 105 °C

Water side components

Water-side components (Order code…/HV-R-…):

Valve actuator:

1 × thermoelectric actuator for opening and closing valves, with position indicator, including plug-in connecting cable, operating voltage 24 V DC, control voltage 0 - 10 V DC, power consumption 1 W, protection class: IP 54

Straight-way valve:

1 × small straight-way valve ½" standard, hand-tight pre-assembled, PN 16, DN 10, kvs 0.4 (alternatively 0.25, 0.63 or 1.0 m³/h - please let us know the required kvs value), straight-way valve body with external thread on both sides ½" flat sealing, media temperature 1 to 110 °C

Lockshield:

1 × lockshield on both sides ½", hand-tight pre-assembled, nominal width DN 15; straight-through valve body with external thread on both sides ½" flat sealing, for regulating and shut-off, maximum media temperature 120 °C

Optional control accessories

Optional equipment to increase the comfort of the FSL-CONTROL III:

TROX control panels for FSL-CONTROL III:

At least one room temperature signal is required per room. There are several variants of TROX room control panels available, optionally with or without selector switch. Additionally, we offer a room temperature sensor RTF without control elements. Alternative on-site room control panels must be connected via bus communication.

Digital room control panels for surface mounting:

For operation and adjustment of the ventilation units.

  • Supplied loosely as an accessory. Connection to master unit via Modbus Serial line. Project-specific software including setpoint value adjuster, various status displays, selector switch, CO2 indicator. Touch-sensitive colour display 3.5" 320 × 240 pixels. Sensor: NTC 10 kΩ. Protection level: IP 20. Type: Schneider TM172DCLWT. Dimensions (H × B × T): 120 × 86 × 25 mm, weight: 340 g, colour: white. Installation: Surface mounting or on a standard flush-mounted box. Power supply: 24 V DC (including suitable switching power supply unit for flush-mounted installation). Power consumption: 3.2 VA/1.3 W. Other design frames are available upon request and for a surcharge.

Control panels with selector switch for surface mounting

Control panel with selector switch, type Thermokon, for surface mounting:

  • Supplied loosely as an accessory, with room temperature sensor, setpoint adjuster, override button, LED and 3-step selector switch as well as off and automatic, casing made of PVC0 pure white (RAL 9010), mounting on 60 mm flush-mounted box or directly on the wall, NTC thermistor as sensor element, resistance 20 kΩ at 25 °C, dimensions (B × H × T): 84.5 × 84.5 × 25 mm, operating temperature: -35 to 70 °C


Control panels without selector switch for surface mounting

Control panel without selector switch, type Thermokon, for surface mounting:

  • Supplied loosely as additional part, with mode display, push button and setpoint adjustment, sensor NTC 20 kΩ, protection level: IP 20, dimensions (B x H x T) 84.5 × 84.5 × 25 mm


Room temperature sensor for surface mounting

Room temperature sensor TROX RTF, surface mounting:

  • Supplied loosely as a separate part, room sensor without operating elements, measuring range: -35 to 70 °C, NTC 10 kΩ sensor, screw terminal connection terminal, cable cross-section 1.5 mm2, protection level IP 20, mounting on wall or on 70 mm flush-mounted box, dimensions (B × H × T) 85 × 85 × 30 mm, ABS casing in RAL 9010

Control panels without selector switch for flush mounting:

Manual operation of the ventilation units, high-quality appearance, matching design frames from various switch ranges. The units are particularly suitable for design-oriented interiors.

Control panel without selector switch, type Thermokon, for flush mounting, switch programme Berker S.1, polar white

  • Supplied loosely as an accessory, with mode display, push button and setpoint adjuster, NTC sensor 20 kΩ, protection level: IP 20

Control panel without selector switch, type Thermokon, for flush mounting, switch programme Berker Q.3, white

  • Supplied loosely as an accessory, with mode display, push button and setpoint adjuster, NTC sensor 20 kΩ, protection level: IP 20

Control panel without selector switch, for flush mounting, type Thermokon, switch from Busch Jäger future linear range, white

  • Supplied loosely as an accessory, with mode display, push button and setpoint adjuster, NTC sensor 20 kΩ, protection level: IP 20
  • Other switch programmes on request


Control panels without selector switch and without setpoint value adjuster, for flush mounting:

Control panel without selector switch and without setpoint value adjuster, type Thermokon, for flush mounting, switch programme Gira E2

  • Supplied loosely as an accessory, with mode display and push button, NTC sensor 20 kΩ, protection level: IP 20
  • Other switch programmes on request

Electromotive valve actuators as an alternative to the thermoelectric actuators installed as standard:

  • 2 x electromotive actuators for opening and closing valves, supply voltage AC/DC 24 V, maximum power consumption 2.5 VA, signalling of control signal 3-point DC 0 – 10 V, permitted operating fluid temperature 1 to 110 °C

Pressure-independent control valves as an alternative to the small straight-way valves installed as standard:

  • 2 x pressure-independent control valves, hand-tight pre-assembled with modulating open/close control in combination with an externally adjustable dynamic volume flow controller, with full valve authority, nominal width DN 10, straight-through valve body with external thread on both sides ½" flat sealing, media temperature 0 to 120 °C

Interface for integration into an on-site MCE/BACS:


Modbus TCP interface including web server (order code .../MT/...)

To increase convenience, we recommend integration into an on-site MCE/BACS or visualisation with X-TAIRMINAL. FSL-CONTROL III can be integrated into an on-site MCE/BACS via the Modbus TCP protocol. Additionally including web server for simplified configuration, commissioning and remote monitoring of the unit. The MCE/BACS is not included in the supply package from TROX GmbH, only the interfaces listed above are available here.

  • Modbus TCP interface (Ethernet)

BACnet IP interface including web server (order code .../BI/...):

To increase convenience, we recommend integration into an on-site MCE/BACS. FSL-CONTROL III offers the option of being integrated into an on-site MCE/BACS via the BACnet IP protocol. Additionally including web server for simplified configuration, commissioning and remote monitoring of the unit. The MCE/BACS is not included in the supply package from TROX GmbH, only the interfaces listed above are available here.

  • BACnet IP interface (Ethernet)

Modbus RTU (order code .../MR/...):

To increase convenience, we recommend integration into an on-site MCE/BACS. FSL-CONTROL III offers the option of being integrated into an on-site MCE/BACS via Modbus RTU. The MCE/BACS is not included in the supply package from TROX GmbH, only the interfaces listed above are available here.

  • Modbus RTU interface (RS485)

BACnet MS/TP (order code .../BM/...):

To increase convenience, we recommend integration into an on-site MCE/BACS. FSL-CONTROL III offers the option of being integrated into an on-site MCE/BACS via BACnet MS/TP. The MCE/BACS is not included in the supply package from TROX GmbH, only the interfaces listed above are available here.

  • BACnet MS/TP interface (RS485)

Version as SLAVE DEVICE

Identical to the MASTER DEVICE, as described above, but with the following deviations:

  • No room air quality measurement in the unit
  • No connection option for room control panels
  • No outdoor temperature detection in the outdoor air
  • No connection to on-site bus communication possible
  • Pre-assembled self-sufficient control system for decentralised façade ventilation units in SLAVE construction

Replacement filter set suitable for the appliance version

  • Extract air filters cut to size as filter mats
  • Outdoor air filter as Mini Pleat filter

Commissioning of the decentralised ventilation units

Commissioning/parameterisation of the decentralised ventilation units without integration into an on-site MCE/BACS

  • Visual inspection of the device connections on site for compliance with the respective installation specifications from the installation and configuration instructions: air connections, heating/cooling connection, electrical connections, integration into the installed outer casing, connections of external components
  • Checking and, if necessary, adapting the project parameters pre-set in the factory with regard to customer-specific adaptations
  • Functional test of the individual components (control elements, fans, valves, dampers, sensors)
  • Checking the project-specific control functions including any special functions such as volt-free switch contacts
  • Documentation of the device settings and service work in a service report. The service report must be signed by your company or representative as the client.
  • Invoicing is done as a flat rate, derived from the number of units and distance.

Commissioning/parameterisation of the decentralised ventilation units with integration into an on-site MCE/BACS

  • Visual inspection of the device connections on site for compliance with the respective installation specifications from the installation and configuration instructions: air connections, heating/cooling connection, electrical connections, integration into the installed outer casing, connections of external components, connections of MCE/BACS
  • Checking and, if necessary, adapting the project parameters pre-set in the factory with regard to customer-specific adaptations
  • Functional test of the individual components (control elements, fans, valves, dampers, sensors)
  • Checking the project-specific control functions including any special functions such as volt-free switch contacts
  • Function test of the communication to the MCE/BACS in cooperation with the controls provider:
    • Checking that the on-site settings comply with the specifications in the installation and configuration instructions
    • Input test of the data points sent on site
    • Output test of the output data points
    • Trial operation of the operating states that can be switched by the MCE/BACS
  • Documentation of the device settings and service work in a service report. The service report must be signed by your company or representative as the client.
  • Invoicing is done as a flat rate, derived from the number of units and distance.

Instruction in operation and maintenance

  • One-time instruction for the operation of the decentralised ventilation units consisting of:
    • Description of the equipment functions on the unit that has already been put into operation
    • Description of the room control panel and the room conditions that can be influenced by it
    • Description of the maintenance work
  • Invoicing is done on a flat-rate basis. The instruction is carried out by the responsible sales representative


SA-V41KM / 397 × 2350 × 359 / C3MAT / MR / C / Z / A / HVR0,40 / KVR0,40
|||||||||||||||||||
12345678910111213141516171819
1 Type
SA-V
vertical decentralised ventilation unit X-CUBE/SCHOOLAIR-V

2 Variant
No entry: Standard

3 Heat exchanger
4 4-pipe

4 Heat exchanger construction
Specify construction (technical design with TROX EPF or TROX CONFIGURATOR)

5 Construction
KO
without condensate drain
KM with condensate drain

6 Nominal size [mm]
Width × height × depth
397 × 2350 × 359

7 Control system
OR
without control system
C3 with FSL-CONTROL III

8 Control function
MA
Master
SL Slave

9 Real time clock
Only with control function MA
No entry: without real time clock
T with real time clock

10 Interface
No entry: without interface
MT with Modbus TCP
MR with Modbus RTU (only with control function MA)
BI with BACnet IP
BM with BACnet MS/TP (only with control function MA)

11 Air quality sensor
Only with control function MA
No entry: without air quality sensor
C with CO2sensor
V with VOC sensor

12 Supply air temperature sensor
Z
with supply air temperature sensor

13 Outdoor air temperature sensor
Only with control function MA
No entry: without outdoor air temperature sensor
A with outdoor air temperature sensor

14 Heating valve
Only with heat exchanger 2 or 4
HV with thermoelectric actuator
HVE with electromotive actuator

15 Lockshield – heating circuit
Only with heat exchanger 2 or 4
R with lockshield

16 kVS value – heating valve
Only with heat exchanger 2 or 4
0.25 (straight-way valve)
0.40 (straight-way valve)
0.63 (straight-way valve)
1.00 (straight-way valve)
F0.50 (pressure-independent control valve)

17 Cooling valve
Only with heat exchanger 4
KV with thermoelectric actuator
KVE with electromotive actuator

18 Lockshield – cooling circuit
Only with heat exchanger 4
R with lockshield

19 kVS value – cooling valve
Only with heat exchanger 4
0.25 (straight-way valve)
0.40 (straight-way valve)
0.63 (straight-way valve)
1.00 (straight-way valve)
F0.50 (pressure-independent control valve)


Order example: SA-V-4-1-KM/397×2350×359/C3-MA-T/MR/C/Z/A/HV-R-0.40/KV-R-0.40

TypeSA-VVentilation unit for ceiling installation X-CUBE/SCHOOLAIR-V
Variant-Standard
Heat exchanger44-pipe
Heat exchanger construction1Heat exchanger type 1
ConstructionKMwith condensate drain
Nominal size [mm]397×2350×359Width 397, height 2350, depth 359
ControlC3with FSL-CONTROL III
Control functionMAMaster
Real time clockTwith real time clock
InterfaceMRwith Modbus RTU
Air quality sensorCwith CO2sensor
Supply air temperature sensorZwith supply air temperature sensor
Outdoor air temperature sensorAwith outdoor air temperature sensor
Heating valveHVwith thermoelectric actuator
Lockshield – heating circuitRwith lockshield
kVS value – heating valve0.400.40 (straight-way valve)
Cooling valveKVwith thermoelectric actuator
Lockshield – cooling circuitRwith lockshield
kVS value – cooling valve0.400.40 (straight-way valve)

Product details

  • PRODUCT DETAILS

Installation and commissioning

  • Installation on the floor in front of the outside wall
  • Level adjustment using the 4 levelling feet (+40 mm)
  • Fixing bracket on the top of the unit and 2 fixing points under the heat exchanger for screwing in to the wall or ceiling slab
  • The outdoor air intake or exhaust air discharge takes place via 2 façade openings. The façade openings must be professionally provided by the customer and ideally have a slope to the outside
  • Free area of ventilation openings: 0.031 m² for each opening (outside and exhaust air) and 0.1 m² per opening (supply and extract air)
  • Weather protection for the outdoor air and exhaust air openings to be provided by others
  • Installation and connections to be performed by others. Fixing, connecting and sealing material not included
  • Water supply and return connections are on the right-hand side of the unit, as seen from the room
  • The customer must ensure that the unit can be drained and vented.
  • The electrical connection is on the right-hand side of the unit, as seen from the room
  • We recommend using flexible hoses to connect the unit to the pipework so that the heat exchanger can be easily removed for cleaning.
  • The under sill trim provided by others must not obstruct maintenance access at the front of the unit or installation and removal of the unit.

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