Biddle NOZ Series Instructions for use

User’s and Installer’s Guide
indirect fired air heater
Model NOZ
Version of Guide: 1.3 GB
a

2
Copyright and trademarks
All the information and drawings in this manual are the property of Biddle and may not be used (other than for the
actual operation of the device), photocopied, duplicated, translated and/or be brought to the attention of third
parties without Biddle’s prior written permission.
The name Biddle is a registered trademark.
Warranty and Liability
Please refer to Biddle’s Terms of Sales and Delivery for warranty and liability conditions.
Biddle excludes liability for consequential loss at all times and under all circumstances.
Liability for the contents of this manual
However much care might have been taken in ensuring the correctness and, where necessary, completeness of the
description of the relevant parts, Biddle disclaims all liability for damage resulting from any inaccuracies and/or
deficiencies in this manual.
Should you detect any errors or ambiguities in this manual then we would be pleased to hear from you: it helps us
to improve our documentation even further.
Biddle retains the right to change the specifications stated in this manual.
For more information
If you have any comments or questions about specific topics relating to this product, please do not hesitate to
contact Biddle.
Address for the UK:
Biddle Air Systems Ltd.
St. Mary’s Road
Nuneaton
Warwickshire CV11 5AU
United Kingdom
tel: [phone]
fax: [phone]
e-mail: [e-mail]
internet: www.biddle-air.com
Address for other countries:
Biddle bv
P. O. B o x 1 5
NL-9288 ZG Kootstertille
The Netherlands
tel: [phone]
fax: [phone]
e-mail: [e-mail]
internet: www.biddle.info

USER’SAND INSTALLER’SGUIDE
Version: 1.3 (02-10-2002) 3
. . . Table of contents
1 Introduction 5
1.1 About this guide 5
1.2 How to use this guide 5
1.2.1 For whom is this guide intended? 5
1.2.2 Marginal symbols 5
1.2.3 Pictograms on the device and in the guide 6
1.2.4 Related documentation 6
1.3 About the device 7
1.3.1 Applications 7
1.3.2 Mode of operation 7
1.3.3 Types available 7
1.3.4 Type plate 7
1.3.5 Available accessories 7
1.4 Safety instructions 9
2 Installation 11
2.1 Delivery check 11
2.2 Preparations for installation 11
2.2.1 Placement of the device 11
2.2.2 Operation 12
2.2.3 Water connections 12
2.2.4 Fitting the roof cowl 13
2.3 Installation of the device 13
2.4 Installation of accessories 14
2.4.1 Waterside control 15
2.4.2 Filter section 16
2.4.3 Damper section 16
2.4.4 Roof cowl 17
2.5 Installation of the control unit 17
2.6 Function check 18
2.7 Preparations for use 18
2.7.1 Controlling the discharge direction 18
3 Operation 19
3.1 Introduction 19
3.2 User actions 19
3.2.1 Switching the device on/off 19
3.2.2 Regulating the air displacement 19
4 Maintenance 21
4.1 Introduction 21
4.2 Safety instructions 21
4.3 Cleaning the filter 21

AIR HEATER
4
4.4 Troubleshooting 22
4.4.1 Device does not work 22
4.4.2 Device does not heat or heats insufficiently 22
5Service 23
5.1 Introduction 23
5.2 Safety instructions 23
5.3 Replacing the fan 23
5.4 Replacing the heat exchanger 24
5.5 Replacing a nozzle 25
5.6 Replacing the main isolating switch 26
Index 27
EC declaration of agreement 28

USER’SAND INSTALLER’SGUIDE INTRODUCTION
Version: 1.3 (02-10-2002) 5
1. . Introduction
1.1 About this guide
This guide describes the features and correct use of the air
heater. Installation and repair are also described.
The guide contains important information for the correct
functioning, operation and maintenance of the device. This
document also contains important instructions for preventing
potential accidents and damage while the device is in
operation and for ensuring that the device functions as safely
as possible.
For that reason, please read through this guide thoroughly
before putting the device into operation. Familiarise yourself
with the operation of the device and follow the instructions
carefully.
1.2 How to use this guide
If you are unfamiliar with the air heater then please read the
chapters in sequence. If you are familiar with the device then
you can use the guide as a ‘ready reference’. You can easily find
the information you are looking for by using the table of
contents and the list of keywords.
1.2.1 For whom is this guide intended?
For those who are actually operating the device, Chapters
3 Operation and 4 Maintenance are important.
For the installer the other chapters are also important.
1.2.2 Marginal symbols
In this guide the following marginal symbols are used:
Note:
nDraws your attention to an important part of the text.
Read this part of the text carefully.

INTRODUCTION AIR HEATER
6
Caution:
cIf you do not perform this procedure or action correctly you
can damage the device.
So follow the instructions carefully.
Warning:
wIf you do not perform this procedure or action
correctly you can cause bodily injury and/or damage.
So follow the instructions carefully.
Danger:
dThis indicates actions which are not permitted.
Ignoring this warning can lead to serious damage or
accidents which may involve bodily injury.
The action concerned may only be performed by
qualified technical staff when carrying out
maintenance or repair.
1.2.3 Pictograms on the device and in the guide
The pictograms in Table 1-1 refer to possible risks and/or
dangers. You will find these pictograms in the text when risky
actions are being discussed. The same pictograms will also be
found on the device.
1.2.4 Related documentation
In addition to this guide the following documents are supplied
with the device:
• electrical wiring diagram.
Table 1-1 Pictograms
PICTOGRAM DESCRIPTION
WARNING: You are entering an area which contains ‘live’ components.
Accessible to qualified maintenance staff only.
Caution is urged.
WARNING: This surface or part can be hot. There is a risk of burns on
contact.
ê
ç

USER’SAND INSTALLER’SGUIDE INTRODUCTION
Version: 1.3 (02-10-2002) 7
1.3 About the device
1.3.1 Applications
The air heater is intended for the heating of large, open
spaces. The device is placed at the top of the space concerned
(freely suspended).
1.3.2 Mode of operation
The device blows currents of warm air downwards. The air
flow rate ensures that the warm air is spread over a large area.
1.3.3 Types available
The table shows an overview of the types of devices available.
The type code is composed by selecting one option from each
column. For example, the elements can be combined to form
the type code NOZ 25-W3-D. This code will be found on the
type plate (see section 1.3.4).
Every combination can be supplied, with the exception of the
combination NOZ 50 with supply voltage E.
1.3.4 Type plate
You will find the type plate behind the cover of the isolating
switch, and above the isolating switch. The ‘type’ line shows
the full type code (required when, for example, ordering
parts).
1.3.5 Available accessories
• suspension frame with anti-vibration mountings;
• control switch: a switch with 2 or 5 speed positions and
2 free contacts to which, for example, a room thermostat
or timeswitch can be connected;
Table 1-2 Types available
SIZE HEATING MEDIUM SUPPLY VOLTAGE
NOZ 25 W2 (water; element has 2
rows)
E (230 V AC, 50 Hz)
NOZ 50 W3 (water; element has 3
rows)
D (400 V AC, 50 Hz)
A (no heating)
Type NOZ 25-W2-E
Code - U 230 V 1N~ 50 Hz
Biddle bv
Markowei 4
NL-9288 HA Kootstertille Nº 205010/1-1 00-01 I
max
L1 2.7 A
I
max
L2 -
M 50 kg I
max
L3 -
Medium LPHW P
motor
0.59 kW
p
max
1400 kPa P
heating
-

INTRODUCTION AIR HEATER
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•watersidecontrol;
• room thermostat;
• frost protection thermostat;
• set of nozzle caps.
Ventilation accessories:
• roof cowl;
• interconnecting ducts;
• filter module (G2);
• damper module;
•dampermotor.

USER’SAND INSTALLER’SGUIDE INTRODUCTION
Version: 1.3 (02-10-2002) 9
1.4 Safety instructions
Caution:
cThe following instructions are essential for the safe use of the
device:
• Do not insert any objects into the suction openings or the
nozzles.
• Never block the suction openings or the nozzles.
You are, however, allowed to cover a maximum of 2 of the
nozzles with the caps provided.
• During use the upper surface of the device can become
hot.
• Mount the device at least 3.5 m above the floor. It should
not be possible to reach the nozzles without the use of
mechanical aids.
Warning:
wThe following instructions are essential for working
safely on the device (for installation, maintenance or
repair).
Before opening the device:
• Switch the device off with the control switch.
• The heat exchanger contains water at a temperature of
anything up to 120 °C. Allow the device to cool before
starting work in the vicinity of the heat exchanger.
• Isolate the device from the mains by setting the isolating
switch to the zero position.
• Wait until the fan has stopped.
• If you are going to perform maintenance or repairs on the
electrical parts, switch the unit off at the mains.

INTRODUCTION AIR HEATER
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USER’SAND INSTALLER’SGUIDE INSTALLATION
Version: 1.3 (16-10-2006) 11
2. . Installation
2.1 Delivery check
1. On delivery, check the device and packaging. Report any
transport damage to the supplier immediately.
2. Make sure that all parts (incl. any accessories which you
might have ordered) have been supplied.
2.2 Preparations for installation
2.2.1 Placement of the device
1. Make sure that the structure on which the air heater will
be suspended is capable of supporting the weight of the
device. The weight is shown on the type plate (see
section 1.3.4).
2. The device must hang freely in the room. The following
measurements must be observed:
- the device must hang at least 3 m from the nearest wall,
- the distance from the bottom of the unit down to the
floor must be 2,8 to 14 metres.
- the distance between the ceiling and the device must be
at least 20 cm (NOZ 25) or 30 cm (NOZ 50).
3. The upper part of the device can become hot during use.

INSTALLATION AIR HEATER
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2.2.2 Operation
The control switch is connected to the device via a 230/400 V
cable (depending on the type of device). This is also the power
cable for the device.
Caution:
cWhen installing the device use the supplied wiring diagram.
1. Fit the cable between the control switch and the device.
Warning:
wThe device must be earthed.
2.2.3 Water connections
1. Make sure that the hot water installation has sufficient
capacity. In Table 2-1 you will find the relevant
specifications of the device.
2. Connect the hot water pipes. Biddle recommends fitting an
isolating valve in both pipes. Optionally you can fit a
waterside control to regulate the discharge temperature
(see section 2.4.1). The dimensions (in mm) for NOZ 25/
NOZ 50 are shown in the drawing on the left.
640/865
Supply
Return
710/935
512/738
Table 2-1 Specifications of the heat exchanger
NOZ 25-W2 NOZ 50-W2 NOZ 25-W3 NOZ 50-W3
The values below apply to an
entering air temperature of 20 °C
and a water range of 90/70 °C
The values below apply to an entering
air temperature of 20 °C and a water
range of 70/50 °C
max. heating capacity 24.5 kW 53.3 kW 21.4 kW 47.3 kW
max. water volume flow rate 1082 l/h 2350 l/h 931 l/h 2063 l/h
max. waterside pressure loss 4.0 kPa 3.4 kPa 3.5 kPa 4.5 kPa
The values below apply to an entering air temperature of 18 °C and a water
range of 82/71 °C
max. heating capacity 24.9 kW 54.3 kW 34.0 kW 75.0 kW
max. water volume flow rate 1980 l/h 4392 l/h 2700 l/h 6012 l/h
max. waterside pressure loss 12 kPa 10 kPa 21 kPa 27 kPa

USER’SAND INSTALLER’SGUIDE INSTALLATION
Version: 1.3 (16-10-2006) 13
2.2.4 Fitting the roof cowl
1. Make a hole in the roof. The dimensions are shown in
Table 2-2.
2. Make a curb 1around the hole.
3. Fit roof covering 2over the curb.
4. Remove the top of the roof cowl by loosening the bolts 3.
5. Place the roof cowl over the curb and attach the cowl
using the screws in the curb as at 1.
6. Replace the top of the covering.
7. Give all cracks between the roof cowl and the roof a
damp-proof and leak-proof finish.
2.3 Installation of the device
Note:
nDuring the installation period protect the device against
damage and against infiltration by dust, cement, etc. The
packaging, for example, can be used for this purpose.
Note:
nA suspension frame is available. This is a rectangular frame
with four threaded ends in the correct position. Inside the
threaded ends are vibration isolators.
1. Place the suspension frame into position.
If you are not using a suspension frame then insert four
threaded ends M8. Make sure that the threaded ends hang
perpendicular.
2. Onto each threaded end, screw two bolts a few
centimetres apart.
Table 2-2 Dimensions of roof vent flange
NOZ 25 NOZ 50
flange opening 575 x 575 mm 800 x 800 mm
1
2
3333

INSTALLATION AIR HEATER
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3. Hang the device up, on the lower set of bolts. At least 2
people are required for this task: the weight is shown on
the type plate (see section 1.3.4):
- Push the bolts through the keyholes in the upper face
of the device (movement 1).
- Move the device so that the threaded rods stick
through the narrow end of the keyholes 2.
- There is a locking plate between the broad and narrow
parts of the keyhole: lift the device while moving it.
- Allow the device to sink down onto the bolts 3.
4. Tighten the upper set of bolts against the plating.
5. Connect the hot water pipework.
6. Set the main switch to 0.
7. Open the housing of the isolating switch: loosen the screw
at the bottom of the housing 4 and tilt the cover upwards
to remove 5.
8. Disconnect the isolating switch from the plate: use a
screwdriver to pull the locking device at the bottom of the
isolating switch downwards 6and then push the switch
upwards 7.
9. Insert the cable into the housing of the isolating switch via
the turnbuckle on the top of the device.
10. Connect the power cable to the isolating switch. See the
supplied connection diagram.
11. Place the isolating switch on the plating.
12. Close the housing of the isolating switch.
2.4 Installation of accessories
Before starting the installation: follow the safety instructions in
section 1.4 on page 9.
1
2
3
5
4
6
7

USER’SAND INSTALLER’SGUIDE INSTALLATION
Version: 1.3 (16-10-2006) 15
2.4.1 Waterside control
The device can be equipped with a waterside control. This
controls the water supply to the heat exchanger so that a
constant discharge temperature is achieved. The control can
also be used to limit the discharge temperature; too high a
discharge temperature (above 50 °C) adversely affects the
performance of the device and shortens the service life of the
components.
The illustrations accompanying the instructions show the
procedure for fitting a 2-way control valve. The actions for
fitting a 3-way valve are identical.
1. Mount the control valve 1on the supply pipe of the heat
exchanger (see also section 2.2.3).
2. Fit the thermostatic control element onto the valve.
3. Open the housing of the isolating switch:
loosen the screw at the bottom of the housing and
remove the cover by tilting it upwards.
4. Remove the plastic plug from the hole in the rear of the
housing.
5. Insert the immersion sleeve 2into the hole.
6. Slide the sensor 3 of the thermostatic control element
into the sleeve.
7. Guide the capillary tube 4 out of the housing of the
isolating switch.
8. Connect the hot water pipes.
Caution:
cConnect the supply pipe and the return pipe in the correct
manner (see section 2.2.3).
9. Set the thermostat control element to the desired
temperature.
10. Close the housing of the isolating switch.
1
2
3
4

INSTALLATION AIR HEATER
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2.4.2 Filter section
The device can be fitted with a filter section. The section can
be mounted on the device itself or on a damper section.
The illustrations accompanying the instructions show the filter
section being fitted onto the device. The procedure for fitting
on a damper section is identical.
1. Place the filter section 1over the flange.
Caution:
cIf you want to be able to remove the filter drawer via the side
on which the isolating switch is located you must lead the
power cable out of the way, over the top of the device, to
stop it blocking the drawer.
2. Screw the filter action to the flange using 12 screws 2.
2.4.3 Damper section
The device can be fitted with a damper section to enable the
connection to the ventilation channel to be opened and
closed. The damper section is supplied in two variants:
• a 1-way section (only suitable for ventilation), and
• a 3-way section (suitable for ventilation and recirculation).
The damper section can be fitted on the device itself or onto a
filter section.
The illustrations accompanying the instructions are based on
the mounting of a 3-way damper section onto a filter section.
The procedure for mounting a 1-way damper section or for
mounting on the device is identical.
1. Place the damper section 1over the flange.
2. Screw the section to the flange using 12 screws 2.
3. Connect the servomotor in accordance with the supplied
wiring diagram.
1
2
2
1
2
2

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Version: 1.3 (16-10-2006) 17
2.4.4 Roof cowl
The device can be connected to a roof cowl (see section
2.2.4 ’Fitting the roof cowl’ on page 13). The roof cowl can be
attached to the damper section or the filter section. It is also
possible, however, to fit channels between a section and the
roof cowl.
The illustrations accompanying the drawing are based on
direct assembly of the roof cowl onto a damper section. The
procedure for mounting on the filter section is identical.
1. Check the height at which the device must hang and, if
necessary, fit a channel of the correct length to the roof
cowl.
Caution:
cThe device cannot hang on the roof cowl. Use must always be
made of a suspension construction, e.g. the suspension frame.
2. Fit the device at the correct height underneath the roof
cowl 1.
3. Screw the roof cowl to the flange on the section using 12
screws 2.
2.5 Installation of the control unit
Warning:
wMake sure that the mains supply group on which you
are working is switched off.
Warning:
wThe device must be earthed (grounded).
Note:
nMake sure that you fit the correct control unit (single-phase,
three-phase with star connection or three-phase with delta
connection).
1
2
2

INSTALLATION AIR HEATER
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1. Fit the control unit.
2. Connect the control unit to the power supply cable
(running to the device).
3. If applicable: connect the external controls to the control
unit.
The control unit has two free contacts for connecting, for
example, a room thermostat or a timeswitch.
4. Connect the control unit to the mains.
2.6 Function check
1. Set the isolating switch to 1.
2. Set the control switch to position 1 (and then run through
all the positions).
3. Check the direction of rotation of the fan: the fan should
(when seen from below) be rotating anti-clockwise.
2.7 Preparations for use
2.7.1 Controlling the discharge direction
The nozzles are equipped with a ball-and-socket joint. You can
adjust the nozzles to obtain an optimum distribution of the
discharged air.
Never point the nozzles at walls or other obstacles (such as
scaffolding). If the nozzle is unavoidably pointing at an obstacle
close it with a cap. You can close a maximum of 2 nozzles with
caps. A set of 2 caps is available as an accessory. The best
direction for the nozzles depends on the height at which the
device is hanging (see the illustrations below for guidance).
high placement medium placement low placement

USER’SAND INSTALLER’SGUIDE OPERATION
Version: 1.3 (02-10-2002) 19
3. . Operation
3.1 Introduction
The air heater is controlled during operation via the operating
switch. There are no control elements on the device itself.
The isolating switch on the device is only required during
maintenance.
3.2 User actions
The user can make the following adjustments:
1. Switch the device on/off.
2. Control the fan position.
Controlling the discharge direction is not a user action: this is
set at the time of installation, see section 2.7.1 on page 18.
3.2.1 Switching the device on/off
In position 0 of the control switch the device is switched off.
3.2.2 Regulating the air displacement
The control switch can be used to regulate the fan speed (the
volume of air to be displaced) in 2 or 5 positions. This
depends on the type of switch.

OPERATION AIR HEATER
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