Reznor AB-2 Series User manual
GAS - FIRED AIR CURTAIN
Manual Part No. D301177 Issue A
®
Please read this document carefully before commencing installation, commissioning and/or servicing.
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
Nortek Global HVAC (UK) Limited equipment must be installed and maintained in accordance with the requirements of the Codes of Practice or ruies in force. All
external wiring MUST comply with the codes of practice or rules in force in the country of situation.
Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operation, and maintenance
instructions thoroughly before installing or servicing this equipment.
Gas-fired appliances are not designed for use in hazourdous atmospheres containing flammable vapors or combustible dust, in atmospheres containing chlorinated
or halogenated hydrocarbons or in applications with airborne silicone substances.
Should overheating occur, or the gas supply fail to shut off, shut off the manual gas valve to the appliance before shutting off the electrical supply.
Do not use this appliance if any part has been immersed in water. Immediately call a qualified service technician to inspect the appliance and replace any gas control
that hes been immersed in water.
This appliance is not intended for use by persons (including children) with reduced sensory or mental capabilities or lack of experience and knowledge, unless they
have been given supervision or instructions concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they
do not play with the appliance.
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier.
• Evacuate all personnel.
• Do not store or use petrol or other flammable vapours and liquids in the vicinity
of this or any other appliance.
AB - 2 RANGE
INSTALLATION AND OPERATING MANUAL
PAGE B Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A
Contents
General Information ...............................................................................................................1
Dimensions ............................................................................................................................2
Technical Specification ...........................................................................................................3
Installation Details ..................................................................................................................4
Installation Details (Cont)... ....................................................................................................5
Installation Details (Cont)... ....................................................................................................6
Installation Details (Cont)... ....................................................................................................7
Installation Details (Cont)........................................................................................................8
Wiring Details.........................................................................................................................8
Wiring Details (Cont)..............................................................................................................9
Servicing..............................................................................................................................10
Servicing (Cont)....................................................................................................................11
Servicing (Cont)....................................................................................................................12
Commissioning....................................................................................................................13
Commissioning (Cont)..........................................................................................................14
Part Replacement..................................................................................................................15
Part Replacement (Cont).......................................................................................................16
Part Replacement (Cont).......................................................................................................17
Part Replacement (Cont).......................................................................................................18
Part Replacement (Cont).......................................................................................................19
Part Replacement (Cont).......................................................................................................20
Part Replacement (Cont).......................................................................................................21
Part Replacement (Cont).......................................................................................................22
Part Replacement (Cont).......................................................................................................23
Fault Finding.........................................................................................................................24
Fault Finding (Cont)..............................................................................................................25
User Instructions...................................................................................................................26
Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A PAGE 1
Welcome to the new AB-2 Reznor gas fired air
curtain models. 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.
These instructions refer to products for use in GB
and the IE.
These air curtains are suitable for indoor use
only, and designed to operate at an ambient
temperature between –15°C and 30°C.
When installing, commissioning and servicing is
undertaken on the gas fired air curtains specified
in these instructions, due care and attention
is required to 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.
The primary reason for installing gas fired air
curtains 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).
Reznor gas fired 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.
This manual provides detailed information on
the installation of Reznor gas fired air curtains.
It is essential that these products are installed in
accordance with these manufacturers instructions.
General Information
PAGE 2 Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A
Left side
view
Top view
Mod. A
(mm)
B
(mm)
C
(mm)
D
(mm)
E
(mm)
F
(mm)
Weight
(kg)
AB 175-2 1750 951 456 820 66 1692 160
AB 225-2 2250 951 456 820 66 2192 200
Figure 1. Dimensions (tol. ± 2mm)
Dimensions
Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A PAGE 3
Technical Specification
Model : Air Curtain AB xxxx-2
AB 225N AB 175N AB 225N AB 175N AB 225P AB 175P
Natural gas G20 (I2H) Natural gas G25 (I2L) PropaneG31 (I3P)
Gas Connection ¾ inch external thread
Maximum Supply Pressure (mbar) 25 30 45
Minimum Supply pressure (mbar) 17 20 25
Nominal pressure (mbar) 20 25 37
Gross heat input (kW) 66 45,5 66 45,5 65 45,5
Nett heat input (kW) 59.4 41.0 59.4 41.0 60.2 41.0
Nett heat output (kW) 54.0 37.0 54.0 37.0 54.8 37.0
Gas flow rate (m³/uur) 6.3 4.3 7.4 4.3 - -
Gas flow rate (kg/h) - - - - 4.6 3.2
N° of injectors 5
Injector size (mm) Ø3.4 Ø2.9 Ø3.4 Ø2.9 Ø1.85 Ø1.60
Injector pressure (mbar) 7.25 6.35 10.90 9.30 30.50 26.00
Flue nominal bore (mm) 130
I/D fan
Voltage 230 V 1-fasig 50 Hz
Power Rating 120 W
Current 0,9 A (FLC)
Air Distribution Fans
Type Centrifugal (with integral thermal trip)
Speeds 2
N° of fans 4 3 4 3 4 3
Max. air volume 11000m3/hr (AB 175) 13000m3/hr (AB 225)
Voltage 230V 1PH 50Hz
Power rating (per fan) 1140 W
Current (per fan) 5.2A (FLC)
Start current (per fan 11A
Constitution
Model AB175-2 AB225-2
AB350= X 2
AB400= X 1 X 1
AB450= X 2
AB525= X 3
AB575= X 2 X 1
AB625= X 1 X 2
AB675= X 3
WARNING:
THIS AIR CURTAIN SHOULD NOT
BE INSTALLED WHERE THERE IS A
CORROSIVE ATMOSPHERE.
PAGE 4 Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A
Installation Details
Health and safety
Reznor air curtains must be installed in accordance
with the relevant provisions of the Gas Safety
(Installations and Use) Regulations 1998. Due
account should also be taken of any obligations
arising from the Health and Safety at Work Act
1974 or relevant codes of practice. In addition
the installation must be carried out in accordance
with the current IEE wiring regulations (BS 7671),
BS 6896 (Industrial & Commercial) and any other
relevant British 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.
Check the supporting structure to verify that it
has sufficient load-carrying capacity to support
the unit weight. Suspend the heater only from
the threaded nut retainers or with a manufacturer
provided kit.
DO NOT suspend from the heater cabinet panels.
Do not place or add additional weight to the
suspended heater.
Mounting
Reznor gas fired air curtains are supplied with
mounting brackets pre-fitted, either as single
units, or in multiples, which can be bolted
together to suit various door widths.
The minimum mounting height is 1.8 metres
Suspension by means of threaded rods
De gas-fired air curtains can standard be
suspended using threaded rods M10 and lock
nuts.
Ensure that the structural elements which will be
used to suspend the appliance are adequate to
carry the weight of the appliance.
Leave the unit on the pallet. If the bottom of the
unit is not supported or protected damage can
occur.
The heater is supplied with 8 suspension points.
All points must be used.
Ensure that threaded rods are lock nut secured to
ensure against loosening.
Use a lock nut being carefully tightened in order
not to damage the screw thread.
Gap to be kept to a minimum
Bottom of air curtain
to be level with top of
door opening (1.8m
minimum)
Each unit is fitted with 8 suspensionpoints - all
points must be used! Add a nut to lock the
hanger rod to the heater
Figure 2.
Figure 3.
Figure 4.
Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A PAGE 5
Installation Details (Cont)...
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 locking pins (figure 5), The louvres
can now be moved to the desired position and
the locking pins re-tightened.
Note: The AB 225-2 model has two pairs of
lock nuts, whereas the AB 175-2 model only
has one pair.
Suspension by means of fixing
brackets (option).
The use of fixing brackets to suspend the air
curtain is optional (to be specified on order form).
See figure 6.
By using suitable steelwork the air curtains can be
fixed to the building structure.
Multiple air curtains
Multiple air curtains must be fixed to the building
structure by means of threaded rods as described
in section ‘Suspension by means of threaded
rods’.
The use of fixing brackets to install the air curtains
if optional (see section ‘Suspension by means of
threaded brackets (option)’.
Make sure that the multiple air curtains are level
and in the same plane in order to avoid bending
of the system.
Then, the air curtains must be fixed together by
means of four M6 bolts, nuts and washers in the
hereto provided holes in the side of the unit.
Figure 5. Lock Nut
Figure 6.
Figure 7.
PAGE 6 Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A
Flueing
The gas fired air curtain must be installed with
a fixed flue. The fan is fitted with a 130mm
diameter female outlet. (Flue and fittings can be
supplied by the manufacturer).
The flue pipe should be adequately supported at
regular intervals from the building structure and
terminated externally with a British Gas tested
and certified GC1 terminal.
The maximum flue length is 7m and the
maximum number of bends is two on individually
flued appliances. The flue may be installed
vertically or horizontally, noting that horizontal
flues MUST be terminated vertically. (See figures
8 & 9).
Flue Technical Details
Model AB 225 - 2 AB 175 - 2
Gas type Nat gas (G20) Prop. (G31) Nat. gas (G20) Prop. (G31)
Mass flow rate of flue
gasses (kg/s) 0,03337 0,0332 0,02576 0,0283
Flue gas temp. At flue
outlet (ºC) 188 173 189,5 187
Flue pressure positive
(Pa) 8 8
Ventilation requirements
In buildings having an air change rate of less than
0.5 per hour, additional mechanical or natural
ventilation is required. For detailed information
please see BS6230 section 5.2.2.2.1.1.
Mechanical ventilation
Should be installed to meet a minimum of 0.5 air
changes per hour using appropriately sized fans
interlocked with the heaters.
Natural ventilation
Low level ventilation openings with a free area of
at least 2cm2/kW shall be provided. See section
5.2.2.2.1.2.
Installation Details (Cont)...
Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A PAGE 7
Right Side View
Side View
Installation Details (Cont)...
Figure 8. Typical Vertcial Flue Arrangement
Figure 9. Typical Horizontal Flue Arrangement
PAGE 8 Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A
Before fitting a horizontal flue, it will be necessary
to rotate the I/D fan through 90º on it`s mounting
bracket to enable the flue to be routed to the rear
of the air curtain as shown in figure 9.
Removal and refitting of the I/D fan is described on
page 19 of this manual, parts replacement.
Note 1: The maximum permissible horizontal flue
length should be calculated using the formula for
equivalent flue sizes shown on the previous page.
Note 2: When the horizontal flue is to pass
through a wall constructed of combustible
material, a suitable approved fireproof sleeve
should be fitted prior to installing the flue pipe.
Installation Details (Cont)...
Wiring Details
Figure 10.
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