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.
NO
YES
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.
NO