Reznor AB-2 Series Supplement

MANUAL PART NO. D301291

INSTALLATION & SERVICE MANUAL

AB-2 INDUSTRIAL

AIR CURTAIN RANGE

AMBIENT, ELECTRIC & LPHW MODELS

Please read this document carefully before commencing installation, commissioning and/or servicing.

Leave it with the end user/site agent to be placed in their premises technical ﬁle after installation.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death.

All work must be carried out by appropriately qualiﬁed persons.

The manufacturer does not take any responsibility in the event of non-observance of the regulations concerning the connection of

the apparatus causing a dangerous operation possibly resulting in damage to the apparatus and/or environment in which the unit is

installed.

EN ISO 12100:2010 Safety of machinery.

EN 60204-1:2018 Safety of machinery. Electrical equipment of machines.

EN 55014-1:2017 Electromagnetic compatibility.

EN 60335-2-30:2009+A11:2012 Safety. Requirements for room heaters to the following

European CE directives- 2006/95/EC - low voltage; 2014/35/EU - Electromagnetic compatibility

Page 2 Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291

Document Index

GENERAL INFORMATION ...................................... ..3

SECTION 1 – TECHNICAL INFORMATION.............. ..4

SECTION 2 – DIMENSIONS .................................... ..4

2.1 Weights ............................................................. ..4

SECTION 3 – INSTALLATION DETAILS ................... 4

3.1 Health and safety............................................... ..4

3.2 Single module.................................................... ..5

3.3 Multiple modules............................................... ..5

3.4 Mounting .......................................................... ..5

3.5 LPHW models only............................................. ..6

SECTION 4 – WIRING DETAILS ................................ 7

4.1 Control panel .................................................... .7

SECTION 5 – SERVICING ........................................ ..7

5.1 Tools required .................................................... ..7

5.2 Air outlet louvres ............................................... ..7

5.3 Air distribution fans ........................................... ..7

5.4 Elements............................................................ ..7

5.5 Electrical...............................................................7

SECTION 6 – PARTS REPLACEMENT...................... ..7

6.1 Tools required .................................................... ..7

6.2 Air distribution fans ........................................... ..7

6.2.1 Fan closure plate...................................... ..8

6.2.2 Fan removal............................................. ..8

6.3 Heating element removal................................... ..9

SECTION 7 – SPARE PARTS .................................... 10

SECTION 8 – FAULT FINDING................................. 10

SECTION 9 – USER INSTRUCTIONS ....................... 11

9.1 Important information ....................................... 11

9.2 Control panel..................................................... 11

9.3 To start the AB air curtain................................... 11

Sample wiring diagrams........................................... 12

Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291 Page 3

General Information

Welcome to the AB-2 air curtain range. There are 3

variants within the range, Ambient (unheated), Electric

heated & LPHW. With two sizes - 175 & 225.

Local regulations may vary in the country of use and it is

the installers responsibility to ensure that such regulations

are satisﬁed.

All installation, assembly, commissioning and service

procedures must be carried out by suitably qualiﬁed

competent persons to the statutory regulations in the

country of use.

When assembling, installing, commissioning and servicing

is undertaken on the air curtains please ensure that

working at height regulations are adhered to at the

mounting heights speciﬁed.

All dimensions shown are in mm unless otherwise stated.

The manufacturer reserves the right to alter speciﬁcations

without prior notice.

PLEASE READ this document prior to

installation to familiarise yourself with the

components and tools you require at the various

stages.

This manual provides detailed information on the

installation of AB-2 air curtains. It is essential that

these products are installed in accordance with these

manufacturers instructions.

UNDER NO CIRCUMSTANCES MAKE

MODIFICATIONS TO THE MACHINE AND

IT’S INTENDED USE.

The manufacturer declines all responsibility for any

damages which may be, directly or indirectly, caused

to exposed persons or property, due to improper use

or use of the machine for different purposes other

than the design purposes, incorrect installation,

inappropriate power supply, different or changes to the

installation environment from the one declared during

order conﬁrmation, grave deﬁciency of maintenance,

unauthorized alterations and modiﬁcations, use of non-

original spare parts, removal of the protection guards,

ignoring the instructions for use, negligence, etc.

The primary reason for installing an air curtain is to

prevent the inﬂux of cold outside air through a door

opening into a heated area. Typical applications

include large despatch bay doors in factories and

warehouses, and internal doors between areas of

different temperatures. Wider door openings can be

accommodated by bolting two or more units together.

Air curtains control the internal climate by emitting an

air stream with enough velocity to meet the ﬂoor so

creating an air barrier in the door area. To prevent the

ingress of outside draughts, the discharge louvre is angled

outwards, so that the air leaving the building meets the

wind trying to enter, thus deﬂecting it. (See diagrams

below).

AB air curtains provide uniform air distribution across the

full width of the door, keeping heated or conditioned air

inside the building and stopping the ingress of cold air,

draughts and dust.

Without an air curtain

With an air curtain

Pattern of airﬂow

InsideOutside

Air intake

Page 4 Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291

Model AB175-2 AB225-2

Air distribution fans

Type Centrifugal c/w thermal trip

Speeds 3 3

No of fans 3 4

Max air volume (ambient only) 9,600m3/h 12,800m3/h

Electrical supply ambient &

LPHW models* 230V 1 Phase 50Hz

Current per fan (FLC) 5.2 A 5.2 A

Starting current per fan 12 A 12 A

*When multiple modules are used for a single door, a 3 phase supply

is required

Electric Heated models only

Elements 18 kW 24 kW

Electrical supply 415V 3 Phase 50Hz

Total power consumption 21.42 kW 30.56 kW

Max air volume 9,600m3/h 12,800m3/h

Temp rise - High speed 9.7OC 7.28OC

Temp rise - Low speed 13.86OC 10.39OC

LPHW models only

Coil rating 53 kW 63 kW

Water pressure drop thru coil 12 kpa 15 kpa

Water ﬂow 1.18 l/s 1.4 l/s

Water capacity 3.5 Litres 4.5 Litres

Max water operating pressure 15 bar 15 bar

Max air volume 7,560m3/h 9,400m3/h

Temp rise - High speed* 20OC 20OC

Temp rise - Low speed* 29OC 29OC

*Based upon LPHW ﬂow temp of 82OC, return 71OC

WARNING: This air curtain should not be

installed within a corrosive atmosphere.

2.1 Weights

Model Ambient Electric LPHW

Dry Wet

175 92kg 105kg 134kg 139kg

225 114kg 130kg 162kg 167kg

All weights are approximate

1. Technical information

* Only Electric &

LPHW models

260

Plan view

Front view

End view

758*

100

516

AB175 = 1695, AB225 = 2195

LPHW Coil Centres

AB175 = 1750, AB225 = 2250

28 86

2. Dimensions (mm)

456

Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291 Page 5

3. Installation details.

3.1 Health and Safety.

Due account should be taken of any obligations arising

from the national Health and Safety legilastion or relevant

codes of practice. In addition the installation must be

carried out in accordance with the current IEE wiring

regulations and any other relevant national Standards

and Codes of Practice by a qualiﬁed installer. Isolate all

electrical supplies to the heater & control panel before

proceeding.

For your own safety we recommend the use of personal

protective equipment when handling this air curtain. AB

air curtains are supplied with mounting brackets pre-

ﬁtted, and can be mounted either as single units, or in

multiples, which can be bolted together to suit various

door widths.

The minimum mounting height is 3m (See diagram 2).

3.2 Single module

Each single air curtain should be supported by cantilever

brackets (not supplied) then ﬁxed back to the building

structure by bolting directly using suitable support

brackets, or by suspending from above using suitable

steelwork. (See diagram 3, page 6).

3.3 Multiple modules

Multiple air curtains should be bolted together using 3

off M10 set pins, nuts and washers ﬁtted through the

holes provided in the mounting brackets, then suitable

support channels (not supplied) must be ﬁxed on top of

the factory ﬁtted brackets along the full length of the

assembled air curtains to spread the load.

The assembly can now be ﬁxed back to the building

structure by bolting directly using suitable support

brackets, or suspending from above using steelwork. (See

diagram 4 page 6).

If required, the support channel may be extended slightly

past the ends of the air curtains to aid ﬁxing.

Note: Where multiple air curtains are ﬁtted

above up and over doors or where central

support is inappropriate, the support channel

should be replaced with channels of a greater

cross section to prevent the assembly from

bending.

It may be necessary to adjust the position of the air

outlet louvres to provide the correct airﬂow across the

door opening. This can be done by ﬁrst loosening the

four locking pins located two at each end of the louvres

(arrowed, Fig. A), then loosening the intermediate locking

Allen pins (arrowed, Fig. B). The louvres can now be

moved to the desired position and the locking pins re-

tightened.

Note: The AB 225 model has two pairs of

intermediate locking Allen pins, whereas the AB

175 model only has one pair.

3.4 Mounting

Gap to be kept

to a minimum

Bottom of air

curtain to be

level with top of

door opening

3m minimum

Diagram 2.

Fig A

Locking Pins

Fig B

Locking Allen Pins

Page 6 Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291

Diagram 3. Mounting method (single module)

Front View (Single module)

Cantilever brackets

(not supplied)

Factory ﬁtted

mounting brackets

Diagram 4. Support channel (multiple modules)

Plan View (Twin modules)

Support points

Module 1 Module 2

Typical support channels Factory ﬁtted brackets

WARNING: This air curtain should not be

installed within a corrosive atmosphere.

3.5 LPHW models only.

Each AB module is ﬁtted with a 1¼” (BSP) ﬂow and return

connection. When more than one module is used, size of

the common pipework is to be calculated by the installer

using the ﬂow information shown within technical data

on page 4.

Use of an isolation valve in the pipework for each

coil connection, is highly recommended.

The image on the right illustrates a typical

installation using two AB-2 modules. Note: Each water coil is ﬁtted with a 1/8” drain point

located below either the ﬂow or return connection

Coils are not handed, so ﬂow/return

can be on either coil connection per

module

Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291 Page 7

4. Wiring details

4.1 Control panel

The panel incorporates an on/off selector switch, a high/

low fan speed selector switch, and a heat on/off selector

switch.

Panel operation is described in section 9 of this manual

(user instructions).

A customer speciﬁc control panel wiring diagram

will be supplied within each air curtain control

panel. However sample diagrams are shown at

the rear of this manual

5. Servicing

These appliances should be serviced annually by a

competent person to ensure safe and efﬁcient operation.

In exceptionally dusty or polluted conditions more

frequent servicing may be required.

Isolate electricity supplies before commencing any work.

5.1 Tools required

The following tools and equipment are recommended to

complete the tasks laid out in this manual.

5.2 Air outlet louvres.

The air outlet louvres should be cleaned with a soft brush.

Check that the louvres are set to the required angle. (See

Figs. A/B on page 5 for setting procedure).

5.3 Air distribution fans.

The air distribution fans can be accessed by opening the

fan access lid as described in section 7.1 Fig.2.

Clean off any dust or deposits with a soft brush paying

particular attention to the impeller. Check that the

impeller spins freely, and that there is no play in the fan

bearings.

The fan(s) can be removed, if necessary, as described in

section 6.2.

5.4 Elements

Remove element housing as described in section 6.3

(parts replacement). Clean off any dust or deposits with a

soft brush.

Visually inspect element coils for signs of discolouration,

burning, sagging etc.

5.5 Electrical.

Isolate electricity supplies before commencing

any work.

Check condition and tightness of all terminations in

control panel.

Remove the fan/elements terminal box cover located on

top of the air curtain (Fig.1), and repeat above procedure

for the fan/elements terminations.

Check that the plug/socket connection to each fan (inside

the unit) is tight and that the cable is in good condition.

Switch control panel on and check air curtain operation

in each selector switch position (heat on/off, low//high

speed).

6. Parts replacement

All servicing/maintenance work on this air curtain

should be carried out by suitably qualiﬁed

person. Before commencing any work please

ensure that the electricity supplies are turned off.

6.1 Tools required.

6.2 Air distribution fans.

The air distribution fans can be accessed by removing the

three screws along the bottom edge of the air inlet grille

(Fig.2), and the retaining screws securing the hinged lid

on the underside of the air curtain next to the louvres

(Fig.3).

Adjustable

spanner

Cross point

screwdriver

Small

ﬂat head

screwdriver

Allen key

set

Soft

brush

10mm &

13mm

Spanners

Fig 1

Adjustable

spanner

Cross point

screwdriver

10mm &

13mm

Spanners

Allen key

set

Page 8 Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291

The lid can now be hinged down to access the fans as

shown in Fig.4.

6.2.1 Fan closure plate

Before individual fans can be removed it will be necessary

to remove the fan closure plate. Remove the retaining

screws around the perimeter of the plate. (See Figs.5/6)

The plate can now be removed.

6.2.2 Fan removal

Identify the feed cable for the fan requiring removal and

disconnect it from its cable mounted plug/socket. (See

Fig.7)

The four bolts securing the fan can now be removed as

shown in Fig.8, and the fan removed from the air curtain

downwards.

CAUTION: These fan units are heavy.

Fig 3

Fig 4

Fig 5

Fan outlet

Fan closure plate

Fan outlet

Fan closure plate

Fig 6

Fig 7

Fig 8

Fig 2

Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291 Page 9

Fig. 9 Shows single air distribution fan inisolation for

clarity.

6.3 Heating element removal (see Diagram 7)

To gain access to the elements ﬁrst remove the 9 screws

(A) retaining the element housing.

Remove the 2 screws (B) retaining the top element plate

ends.

Remove the 3 screws (C) retaining the top rail of the

element assembly.

The element assembly can now be tilted forward slightly

and lifted from the 3 retaining tab slots (D).

See diagram 8.

The wiring to the element assembly can now be accessed

at the rear of panel (E), and disconnected after ﬁrst noting

the cable positions.

Finally disconnect the two female spade connectors from

the overheat thermostat (F). The element assembly can

now be withdrawn from the air curtain.

Reﬁtting a new element assembly is the reverse of the

above procedure.

Fig 9

Blanking Plate

Diagram 7

Diagram 8

Page 10 Reznor, AB-2 Ambient Electric & LPHW, Installation Manual, EN 2020-05, D301291

7. Spare parts

Item Description Part No

3 speed air

distribution fan

unit

AB-FAN

AB 225E 24kW

elements

(full set)

100528

Thermal cutout

(1 per module

ﬁtted with

electric element)

900001

Air distribution

fan 5 pin plug/

socket

Plug: 3127

Socket: 3126

AB 175E 18kW

elements (full set) 100527

8. Fault ﬁnding

Air distribution fans

Elements - Electric Heat Models

* If it is determined that the overheat thermostat has

tripped it will be necessary to remove the blanking plug

located on the top face of the element housing to enable

resetting. (See Diagram 7 in section 6 of this manual).

This MUST be done with the electrical supply to the air

curtain turned OFF.

Power on to

panel?

NO Check:

1. Power supply

YES

All air

distribution

fans off?

Check:

1. Control panel man/off/

auto switch position

2. Fan circuit breaker(s)

3. Fan contactor and

associated wiring.

YES

Single fan

unit off?

YES

Check:

1. Motor thermal trip(may

run when cool), test

motor.

2. Motor wiring.

3. Motor plug/socket.

If the fan(s) still fail to

operate normally, please

contact your supplier.

YES

Power on to

panel?

NO Check:

1. Power supply

No heat?

Check:

1. Control panel heat on/

off switch position.

2. Element circuit breaker(s)

3. Overheat thermostat.

Low heat?

Check:

Current load on all

elements. Should be

balanced. If not element(s)

could be open circuit

If the element(s) still fail to

operate normally, please

contact your supplier.

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