Nortek AB 225 User manual

Doc No. 702120 Page of 44
INDEX Section
General Information -------------------------------------------------------- 1
Dimensions--------------------------------------------------------------------2
Technical Specifications ----------------------------------------------------3
Installation Details ----------------------------------------------------------4
Wiring Details ----------------------------------------------------------------5
Servicing ----------------------------------------------------------------------6
Commissioning --------------------------------------------------------------7
Parts Replacement ----------------------------------------------------------8
Spare Parts --------------------------------------------------------------------9
Fault Finding --------------------------------------------------------------- 10
User Instructions ----------------------------------------------------------- 11
Part No. 702120
Nortek Global HVAC (UK) Limited, Fens Pool Avenue, Brierley Hill, West Midlands, DY5 1QA
WARNINGS
Nortek Global HVAC (UK) Ltd equipment must be installed and maintained in accordance with
the relevant provisions of the Gas Safety (Installations and Use) Regulations 1998 for gas fired
products. Due account should also be taken of any obligations arising from the Health and Safe-
ty at Works 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 & Com-
mercial) and any other relevant British Standards and Codes of Practice by a qualified installer.
All external wiring MUST comply with the current IEE wiring regulations.
AIRBLOC AB RANGE
GAS FIRED ROOM SEALED AIR CURTAIN
INSTALLATION AND OPERATING MANUAL

Doc No. 702120 Page 2 of 44
1. General Information.
Welcome to the new AB Airbloc gas fired air
heater 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 heaters 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 heaters 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
heaters 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 heaters 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).
Airbloc gas fired air heaters 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 Airbloc gas fired air heaters. It
is essential that these products are installed in
accordance with these manufacturers
instructions.
Without air curtain
With air curtain Pattern of airflow

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2. Dimensions.
Module A
mm B mm C mm D mm E mm F mm G mm Weight (kg)
AB 175 1750 950 457 1090 700 125 1710 185
AB 225 2250 950 457 1090 700 125 2210 230
Diagram 1: Dimensions (AB 625 shown)
C
D
AB 175 module AB 225 module
AB 225 module
FRONT VIEW
PLAN VIEW
SIDE VIEW
NOTE: Module configurations
can vary.
(see table on page 4)
A A A
E F
G G G

Doc No. 702120 Page 4 of 44
3. Technical Specifications.
Air heater model ABxxxxRS
AB 225N AB 175N AB 225N AB 175N AB 225P AB 175P
Gas type Natural gas G20 (I2H) Natural gas G25 (I2L) Propane G31 (I3P)
Gas connection ½ ¨BSP external thread
Max supply pressure (mbar) 25 30 45
Min supply pressure (mbar) 17 20 25
Nominal pressure (mbar) 20 25 37
Gross heat input (kW) 66 49 66 49 65 49
Nett heat input (kW) 59.4 44.1 59.4 44.1 60.2 45.4
Gross heat output (kW) 60.1 44.6 60.1 44.6 59.2 44.6
Nett heat output (kW) 54.0 40.1 54.0 40.1 54.8 41.3
Gas flow rate (m³/hr) 6.3 4.7 7.4 5.4 - -
Gas flow rate (l/hr) - - - - 9.4 7.0
No. of injectors 5
Injector size (mm) Ø3.3 Ø2.9 Ø3.3 Ø2.9 Ø1.85 Ø1.65
Injector pressure (mbar) 7.5 7.0 10 10 25 25
Flue nominal bore (mm) 130
Air distribution fans
Type Centrifugal (with integral thermal trip)
Speeds 3
No. of fans 4 3 4 3 4 3
Maximum air volume 9600m3/hr (AB 175) 12800m3/hr (AB 225)
Voltage 230V 1PH 50Hz
Power rating (per fan) 1140 W
Current (per fan) 5.2A (FLC)
Start current (per fan) 12A
Model AB175 AB225
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
Constitution
WARNING:
THIS AIR CURTAIN SHOULD NOT BE
INSTALLED WHERE THERE IS A
CORROSIVE ATMOSPHERE.

Doc No. 702120 Page 5 of 44
Gap to be kept to a minimum
1.8m minimum
Bottom of air
heater to be
level with top of
door opening
4. Installation Details.
Health and Safety
Airbloc air heaters 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 heater.
Before installation, check that the local
distribution conditions, nature of gas and
pressure, and the current state of adjustment of
the appliance are compatible.
Airbloc gas fired air heaters 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
(See diagram 2 below).
4.1.1
Each single air heater module 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 4, page 6).
4.1.2
Multiple air heaters 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 heaters 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 3 page 6).
If required, the support channel may be
extended slightly past the ends of the air
heaters to aid fixing.
Note: Where multiple air heaters 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.
4.1 Mounting.
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.
Fig. B
Fig. A
Locking pins
Locking Allen pins
Diagram 2.

Doc No. 702120 Page 6 of 44
Diagram 4: Cantilever bracket mounting
Model AB 225 AB 175
Gas type Natural gas (G20) Propane (G31) Natural gas (G20) Propane (G31)
Mass flow rate of
Flue gases (kg/s) 0.0340 0.0332 0.0242 0.0283
Flue gas temperature
@ flue outlet (ºC) 162 173 172.5 182
Flue pressure (Pa)
positive 55 49
Flue technical details.
4.2 Flueing.
The gas fired air heater must be installed with a
fixed flue as supplied by the manufacturer.
The flue pipe should be adequately supported at
regular intervals from the building structure and
terminated externally.
4. Installation Details cont.
The maximum flue length is 10m and the
maximum number of bends is four. The flue can
be terminated horizontally or vertically. (See
diagrams 5 and 6A on page 7).
Diagram 3: Support channel detail (AB625 shown)
Cantilever brackets
(not supplied)
Factory fitted
mounting brackets
Typical support channels
(not supplied)
Support points
PLAN VIEW
FRONT VIEW

Doc No. 702120 Page 7 of 44
Flue damper
Diagram 5: Typical flue arrangement (AB 625 shown)
FRONT VIEW
4. Installation Details cont.
Ventilation requirements are detailed in
section 4.3.
Note:
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.
Flue damper Flue damper Flue damper
Flue fan
Diagram 6: Typical flue arrangement
with horizontal terminal
Flue fan
Diagram 6A: Typical flue arrangement
with vertical terminal
SIDE VIEWS

SUPPLIED FLUE COMPONENTS
QUANTITY
AIR HEATER MODULES A B C D E F G H I J
AB350 (LH) 2 x 175 1 2 1 1 - 1 1 - 1 1
AB350 (RH) 2 x 175 - 2 - 1 1 1 1 - 1 1
AB400 (LH) 1 1 x 175 1 x 225 1 1 1 1 - 1 1 1 1 1
AB400 (RH) 1 1 x 175 1 x 225 - 1 - 1 1 1 1 1 1 1
AB400 (LH) 2 1 x 225 1 x 175 1 1 1 1 - 1 1 1 1 1
AB400 (RH) 2 1 x 225 1 x 175 - 2 - 1 1 1 1 - 1 1
AB450 (LH) 2 x 225 1 - 1 1 - 1 1 2 1 1
AB450 (RH) 2 x 225 - 1 - 1 1 1 1 1 1 1
AB525 (LH) 3 x 175 1 3 2 1 - 1 2 - 1 1
AB525 (RH) 3 x 175 - 3 1 1 1 1 2 - 1 1
AB575 (LH) 1 x 175 1 x 225 1 x 175 1 2 2 1 - 1 2 1 1 1
AB575 (RH) 1 x 175 1 x 225 1 x 175 - 2 1 1 1 1 2 - 1 1
AB625 (LH) 1 x 225 1 x 175 1 x 225 1 1 2 1 - 1 2 2 1 1
AB625 (RH) 1 x 225 1 x 175 1 x 225 - 2 1 1 1 1 2 1 1 1
AB675 (LH) 3 x 225 1 - 2 1 - 1 2 3 1 1
AB675 (RH) 3 x 225 - 1 1 1 1 1 2 2 1 1
NOTE: (LH) and (RH) references above refer to flue exit direction.
Quantities in the table above refer to fittings supplied with the heaters. Extra flue will be required to exit from the
building based on individual site requirements. See following pages for optional flue and individual
configurations.
I (112998)(L) J (112989)(R)
A (112996) B (112984) C (112985)
D (112991)
F (112995)
E (112997)
G (112986) H (112987)
4. Installation Details cont.

Doc No. 702120 Page 9 of 44
OPTIONAL FLUE COMPONENTS
524-872mm adjustable (113901) 90 deg. elbow (112992) 45 deg. elbow (113900)
955mm flue length (112985) Vertical terminal (114174)
Horizontal terminal (112994)
4. Installation Details cont.
Wall band 50mm ext (113844)
Wall band extension 300mm (113845)
Wall band extension 50-100mm (113846)

Doc No. 702120 Page 10 of 44
AB 350 LH flue configuration (2 x AB 175)
112989 ENDCAP
112984 250 TWIN FLUE CONNECTION
112985 250 TWIN FLUE 955mm
112986 250 TWIN FLUE ADJUSTABLE
112984 250 TWIN FLUE CONNECTION
112995 BOOT CONNECTION
112996 250 TWIN FLUE (LH ONLY) 955mm
112988 ENDCAP
112991 250 BOOT ASSEMBLY