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Four way chilled beam
Four way chilled beam

Halton Rex Expander (RXP) – Chilled beam

Throw pattern expanded to corners, which ensures pleasant room conditions even with higher cooling capacities.

  • Active chilled beam with 4-way air distribution.
  • Adjustable airflow using manual CAV or motorised VAV, with the Halton Air Quality (HAQ) control.

Overview

Compact CAV/VAV chilled beam with 4-way air distribution for suspended ceilings. Ensures silent and pleasant room conditions even with higher cooling capacities.

Application area

  • Cooling and ventilation in offices, hospital rooms, schools, and public spaces.
  • Can be used in Halton’s demand-based ventilation systems.

Key features

  • Active chilled beam with 4-way air distribution.
  • Adjustable airflow using manual CAV or motorised VAV, with the Halton Air Quality (HAQ) control.
  • Throw pattern expanded to corners, which ensures pleasant room conditions even with high cooling capacities.

Operating principle

The primary supply air enters the plenum of the Halton Rex Expander chilled beam, from which it is diffused into the room through the nozzles and supply slots. The air jets from the nozzles induce ambient room air efficiently through the heat exchanger, where the air is cooled by means of the cool water circulating in the heat exchanger. The supply slots direct the air jets horizontally along the ceiling surface, which prevents the feeling of draught.

Fig.1. Operating principle of the Halton Rex Expander chilled beam

In figure Operating principle of the Halton Rex Expander chilled beam, the blue arrows show the supply air coming through the supply slots. The red arrows show the ambient room air going through the front panel and the heat exchanger.

Halton Air Quality (HAQ) control 

Halton Air Quality (HAQ) control is used for adjusting or controlling the rate of the additional supply airflow in a room space. In normal conditions, fresh supply air is provided through the nozzles. Whenever additional air is needed (boost/VAV function), the HAQ control opens and provides more air. VAV stands for Variable Air Volume.

The HAQ control can also be used as a Constant Air Volume (CAV) damper, that is, it can be used for adjusting the k-factor to achieve the correct airflow with a certain pressure level. This removes the need for changing or plugging the nozzles of the Halton Rex Expander chilled beam.

Fig.2. VAV function: Supply air from nozzles (normal mode)

Fig.3. VAV function with HAQ control: Supply air from nozzles and HAQ control (boost mode).

Fig.4. Manual actuator of HAQ control

Fig.5. Electric actuator of HAQ control

Key technical data

Feature Description 
Airflow rate Max. airflow rate < 35 dB: 57 l/s or 205 m³/h (RXP/E-1200)
 Dimensions 600×600 mm or 1200×600 mm
Water pressure
drop
Max. 18.6 kPa (RXP-1200, waterflow 0.1 kg/s)
 Cooling capacity Up to 1700 W
(RXP/E-1200, 100 Pa, 57 l/s, water inlet 14°C,
water mass flow 0.1 kg/s, supply air 16°C)
 Weight 10–22 kg
 Typical static pressure 50–100 Pa
 Water temperature 14–20°C (must be above dew point)

Features and options

 Category

 Feature
(order code)

 Option
(order code)

 Description

Size and  orientation

Product length
L

600, 1200

Two different lengths. Nominal width is always 600 mm.

Duct connection
E

S2, R2, L2

Factory-positioned straight, right,
or left Ø 125 mm.
Position can be changed on site.
See Fig. 1.

Cooling

Coil type
TC

C

Cooling coil. Connection pipes Ø 12 mm.

Airflow

Nozzle type
S

C, D, E

3 options for different airflow or k-factor needs.
Nozzle C is the smallest and nozzle
E the largest.

Halton Air Quality (HAQ) control
AQ

NA

No HAQ. K-factor is determined by nominal size and nozzle selection (CAV).

MA

Manually adjustable CAV control of additional airflow.
Standard air from nozzles, additional air from HAQ.

MO

Motorised VAV control of additional airflow.
Standard air from nozzles, additional air from HAQ.


Fig.1. Duct connection: Spigot positions left, straight, right 

For more detailed information on the order code, see section Order code.

Quick selection

Airflow 

Fig.1. Airflow ranges for Halton Rex Expander without HAQ/with HAQ closed 

Fig.2. Airflow ranges for Halton Rex Expander with HAQ @60 Pa, 125 mm spigot 

Cooling capacity

Product 

Inlet/outlet water temp.
[°C] 

Room temp.
[°C] 

Chamber pressure
[Pa] 

Water mass flow
[kg/s]
 

Airflow
[l/s] 

Capacity
[W] 

Water 

Air (18°C) 

Total 

RXP/C-600

15/17

25

75

0.032

10

269

81

350

RXP/D-600

0.038

 14

315

114

429

RXP/E-600

0.049

22

407

183

590

RXP/C-1200

15/18

0.043

 18

536

150

686

RXP/D-1200

0.054

 25

676

211

887

RXP/E-1200

0.063

 41

790

343

1133

Structure and materials

Fig.1. Halton Rex Expander parts 

No.

 Part Description (material, colour options)

1

 Front panel Pre-painted galvanised steel
Polyester-painted, white (RAL 9003 or 9010),
with special colours available.

2

 Nozzles Nozzle plate: galvanised steel

3

 HAQ control (optional) Painted galvanised steel

4

 Actuator of HAQ   control (optional) Electric actuator (shown in the figure):
connecting cable length 0.9 m
Manual actuator: galvanised steel

5

 Plenum Pre-painted galvanised steel
Polyester-painted, white (RAL 9003 or 9010)

6

 Brackets Galvanised steel
7  Spigot Galvanised steel
8  Frame Pre-painted galvanised steel
Polyester-painted, white (RAL 9003 or 9010),
with special colours available.
9  Connection pipes Copper. Ø 12 mm with a wall thickness of 0.9–1.0 mm,
fulfilling the requirements of European Standard
EN 1057:1996.
10  Coil/Heat exchanger Pipes: copper
Fins: aluminium

Dimensions and weight

The dimensions are given in millimetres (mm).

Fig.1. Halton Rex Expander dimensions (RXP-600)

Fig.2. Halton Rex Expander dimensions (RXP-1200) 

Weight:

Product

AQ model

Dry mass (excl. water) [kg]

Water volume [l]

RXP-600

NA

10.5

0.5

MA

11.4

MO

11.6

RXP-1200

NA

20.9

1.2

MA 21.8
MO 22.1

Specification

The product must fulfil the following requirements:

Structure 

  • Integral recirculation air path through the perforated front panel.
  • Front panel removable to allow general maintenance and cleaning.
  • Front panel removable without special tools.
  • Four-directional air distribution.
  • Unit width 595 mm, height 220 mm.
  • Inlet duct diameter 125 mm.
  • Duct connection position changeable without special tools.
  • Measurement tap to allow airflow measurement.
  • Pipework’s maximum operating pressure 1.0 MPa.

Materials 

  • Plenum, frame, and front panel manufactured from galvanised steel.
  • All visible parts white, painted in RAL 9003, 20% gloss.
  • All pipes manufactured from copper.
  • Water connection pipes have a wall thickness of 0.9–1.0 mm.
  • All pipe joints soldered.
  • All pipe joints pressure-tested at the factory.
  • Heat exchanger fins manufactured from aluminium.

Packaging and identification 

  • The product is protected by a removable plastic coating.
  • The duct connection and pipe ends remain sealed during transport.
  • The product is packed in a cardboard box.
  • The product is identified by a serial number printed on labels attached both to the product and the cardboard box.

Installation

When planning the orientation of the Halton Rex Expander chilled beam, the location of the supply air and water circuit connections must be taken into account. The supply air spigot can be at either side of the unit or at the same end with the water connections. The location can be easily changed on site, if needed.

The location of the actuator of the HAQ control (optional) must also be taken into account to ensure access to the actuator. The actuator is located in the middle of the left side of the unit.

The Halton Rex Expander chilled beam can be attached directly to the ceiling surface (H = 220 mm) or suspended using threaded drop rods (8 mm). The brackets for ceiling installation are located at the sides of the unit.

Fig.1. Installation points of the RXP-1200 (RXP-600) chilled beam 

Because there are no moving parts in the Halton Rex Expander chilled beam, no anti-vibration protection is needed when installing the unit or when connecting the unit to supply air or water circuit connections.

It is recommended that the main pipelines of the cooling and heating water circuits are installed above the level of the heat exchanger to enable venting of the pipework.

The maximum operating pressure for chilled/hot water pipework is 1.0 MPa.

Commissioning

Adjustment of the cooling capacity 

The recommended cooling water mass flow rate is 0.02–0.10 kg/s, resulting in a temperature rise of 1–4°C in the heat exchanger. To avoid condensation, the recommended minimum inlet water temperature of the heat exchanger is 14–16°C.

Balancing and control of water flow rates 

The water mass flow rates of the Halton Rex Expander chilled beam are balanced with adjustment valves installed on the outlet side of the cooling water loops. The cooling capacity of the Halton Rex Expander chilled beam is controlled by regulating the water mass flow rate.

Adjustment of the supply airflow rate 

With a Halton Rex Expander chilled beam that does not have the Halton Air Quality (HAQ) control, the airflow depends on the chamber pressure and the selected nozzle. With the HAQ control included, also the position of the HAQ control must be taken into account.
The chamber pressure can be measured from a measurement tap under the front panel.
The total airflow rate is calculated using the formula below.

Total airflow rate

where

qv          Airflow rate [l/s] or [m³/h
Δpm      Measured static chamber pressure [Pa]
k            Determined according to the table below [l/s]. If calculating m³/h, multiply by 3.6.

Position of HAQ control 

RXP/C-600 

RXP/D-600 

RXP/E-600 

RXP/C-1200 

RXP/D-1200 

RXP/E-1200 

0 / no HAQ 

1.1

1.6

2.5

2.1

2.9

4.7

1

1.7

2.1

3.1

2.6

3.5

5.3

2

2.2

2.7

3.6

3.1

4.0

5.8

3

2.7

3.2

4.1

3.7

4.5

6.3

4

3.2

3.7

4.6

4.1

5.0

6.8

5

3.7

4.1

5.1

4.6

5.5

7.3

6

4.1

4.6

5.5

5.0

5.9

7.7

7

4.5

5.0

5.9

5.5

6.3

8.1

8

4.9

5.4

6.3

5.9

6.7

8.5

9

5.3

5.7

6.7

6.2

7.1

8.9

Example:
The measured static chamber pressure is 70 Pa for RXP/E-600, and the position of the HAQ control is 3. The total airflow rate is 4.1*√(70) ≈ 34.3 l/s.

Order code

RXP/S-L-E, TC-AQ-CO-ZT

S = Nozzle type
C    Nozzle C
D    Nozzle D
E    Nozzle E

L = Length (mm)
600 or 1200

E = Duct connection
S2    Straight / 125 mm
R2    Right / 125 mm
L2     Left / 125 mm

Other options and accessories

TC = Cooling / Heating functions (Coil type)
C        Cooling

AQ = Halton Air Quality (HAQ) control
NA     Not assigned (CAV)
MA     Manual (adjustable CAV)
MO     Motorised (VAV)

CO = Colour
SW    Signal white (RAL 9003)
W       Pure white (RAL 9010)
X        Special colour

ZT = Tailored product
N      No
Y      Yes (ETO)

Order code example

RXP/E-1200-S2, TC=C, AQ=NA, CO=SW, ZT=N

Downloads

Halton Rex Expander (RXP) – Chilled beam
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Eurovent Certification for Chilled Beams
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