Reznor AB175-2 User manual

GAS - FIRED AIR CURTAIN

Manual Part No. D301177 Issue 1

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 Installation Manual, EN 2023-01, D301177 Issue 1

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

These appliances meet the following EC directives:

Gas Appliances (Product Safety and Metrology etc (Amendment etc) (EU Exit) Regulations

2019)

The Eco design for Energy-Related Products and Energy Information (Amendment) (EU Exit)

Regulations 2020

Electromagnetic Compatibility Regulations 2016

Electrical Equipment (Safety) Regulations 2016

Supply of Machinery (Safety) Regulations 2008

Supply of Machinery (Safety) Regulations (A) 2011

Reznor, AB - 2 Gas Installation Manual, EN 2023-01, D301177 Issue 1 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 Installation Manual, EN 2023-01, D301177 Issue 1

Left side

view

Top view

Mod. A

(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 Installation Manual, EN 2023-01, D301177 Issue 1 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:WARNING:

THIS AIR CURTAIN SHOULD NOTTHIS AIR CURTAIN SHOULD NOT

BE INSTALLED WHERE THERE IS ABE INSTALLED WHERE THERE IS A

CORROSIVE ATMOSPHERE.CORROSIVE ATMOSPHERE.

PAGE 4 Reznor, AB - 2 Gas Installation Manual, EN 2023-01, D301177 Issue 1

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 Installation Manual, EN 2023-01, D301177 Issue 1 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 Installation Manual, EN 2023-01, D301177 Issue 1

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 Installation Manual, EN 2023-01, D301177 Issue 1 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 Installation Manual, EN 2023-01, D301177 Issue 1

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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