Biddle Comfort Circle EC User manual

a
Manual
Cassette heater
Model Comfort Circle EC
Version 1.0
Original Manual English

CASSETTE HEATER
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. . Contents
1 Introduction 4
1.1 About this manual 4
1.2 How to read this manual 4
1.3 About the unit 6
1.4 Components and accessories 8
1.5 Safety instructions 9
2 Installation 11
2.1 Safety instructions 11
2.2 Inspection on delivery 11
2.3 General working method 11
2.4 Hanging the unit up 12
2.5 Units with thermostatic control 14
2.6 Installing the thermostats 15
2.7 Adjusting fan speeds 16
2.8 Connecting the unit to the central heating system 16
2.9 Connecting the mains supply 18
2.10 Mounting the cover 19
2.11 Adjusting the discharge pattern 19
3 Operation 21
3.1 On/off (T1) thermostat 21
3.2 Speed change (T2) thermostat 21
3.3 Low temperature cut out (T4) thermostat 21
3.4 Remote switches 21
4 Maintenance 22
4.1 Cleaning the unit 22
4.2 Replacing or cleaning the filter 22
4.3 Scheduled maintenance 23
5 Errors 24
5.1 Safety instructions 24
5.2 Resolving simple problems 24
6 Service 25
6.1 Safety instructions 25
6.2 Removing the main cover 25
6.3 Accessing the interior of the unit 25
6.4 Electronics module 26
6.5 Fuse 27
6.6 Venting the heat exchanger 28
6.7 Draining the heat exchanger 28

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7 Dismantling 29
8 Addresses 30

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1Introduction
1.1 About this manual
This manual describes the installation, operation and mainte-
nance of , the cassette unit model Comfort Circle. The man-
ual also provides instructions and information for servicing
activities.
1.2 How to read this manual
1.2.1 Designations used in the manual
The following symbols are used in the manual:
Note:
nRefers to an important section in the text.
Caution:
cIf you do not carry out the procedure or action
correctly, you may cause damage to the unit.
Follow the instructions precisely.
Warning:
wIf you do not carry out the procedure or
action correctly, you may cause physical injury
and/or damage.
Follow the instructions precisely.

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Danger:
dIs used to designate actions that are not
permitted.
Ignoring this prohibition may lead to serious
damage or to accidents resulting in physical
injury.
1.2.2 Symbols used on the unit and in the manual
The following symbols indicate possible risks or hazards. The
same symbols will also be found on the unit.
1.2.3 Related documentation
In addition to this manual, the following documentation is also
supplied with the unit:
• wiring diagram for installation and servicing.
• insert sheet for adjusting fan speed settings (if required)
SYMBOL DESCRIPTION
wYou have accessed a section of the unit containing compo-
nents which carry a voltage.
Access restricted to qualified maintenance staff only.
Caution is required.
wThis surface or component may be hot. Risk of burns on
contact.

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1.3 About the unit
1.3.1 Applications
The Comfort Circle is designed for heating rooms.
The model is designed for integration into suspended ceilings
but can be used in other ceilings as well. The unit is designed
to be mounted at a height of 2.0 to 3.5 m (from floor to dis-
charge grille).
The unit draws air from the room, heats it, and blows it back
into the room.
Other versions and intended use
Warning:
wApplications other than those described
above are deemed to be ‘usage other than for
the intended purpose’. Biddle is not liable for
damage or loss resulting from usage other
than for the intended purpose. Usage for the
intended purpose also entails observance of
the instructions in this manual.
1.3.2 Working
The Comfort Circle blows out a flow of heated air, creating a
comfortable climate in the room.
The units have a fixed discharge angle setting.
The unit can be delivered with two types of control, an
advanced controller that features a digital controller, or a sim-
pler mechanically thermostatically controlled unit. The manual
covers only the latter. For the advanced controller product,
please refer to the instructions supplied with that product.
1.3.3 Type designation
The table below provides an overview of the available models
of the unit and the corresponding type designations. In combi-
nation, the type designations constitute the type code.

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1.3.4 Type plate
The type plate is located on the front of the unit.
1.3.5 Field of application
Explanation of the type code
TYPE CODE ELEMENT DESIGNATION MEANING
product series CC general designation for the series
size 60 60 x 60 cm
battery type H2 water heating, element is 2 rows thick
H3 water heating, element is 3 rows thick
control BC1 Basic Controls Pack 1
BC2 Basic Controls Pack 2
BC3 Basic Controls Pack 3
ADV Advanced controls
Designations on the type plate
DESIGNATION MEANING
Type complete type code of the unit
Code configuration code
Noserial number, production week and year
M weight of unit
Medium medium
pmax maximum permissible operating pressure
U power supply voltage
Imax max. current
Pmotor max. power consumption by fans
Operating limits for all models
Ambient conditions Minimum temperature 5 °C
Maximum temperature 30 °C
Relative air humidity 20% - 95%, not condensing
Power supply voltage see type plate
Power see type plate
Maximum discharge temperature 60 °C
Maximum operating pressure see type plate

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Note:
nConsult Biddle if you want to connect a unit to a
water flow-path with higher temperatures and higher
pressure.
Warning:
wThe unit may not be used in potentially
explosive environments.
Biddle shall not be held liable for damage
caused by use under these conditions.
1.3.6 CE declaration
The unit is compliant with the applicable CE standards. The
complete CE Declaration of Conformity can be found at:
www.biddle.info.
1.3.7 Modifications and changes
Without the approval of Biddle, no changes or modifications
may be made to the unit that could adversely affect safety. The
CE declaration is no longer valid if the unit has been modified
or changed in any way.
1.4 Components and accessories
1.4.1 What’s in the box
The unit comes in a box, which contains the following compo-
nents:
• unit 1;
• cover 2;
• 2 suspension profiles 3;
• 2 blind plates 4 with fixing screws to adjust the discharge
pattern;
The following components are delivered separately and are
optional items:
• controller ;
Maximum water flow-path H2 82/71 °C
H3 60/40 °C
Operating limits for all models

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• room thermostats
• LTC Pipe stats
• remote wall mounted control switch
1.4.2 Accessories
The following accessories are available as options:
• suspension kit consisting of Flamco rails and threaded rods;
• edge sections for edge finishing in suspended ceilings
1.4.3 Components not supplied
The following components required for installation must be
obtained from third parties:
• threaded rods (M8)
• other cabling
•on models with ventilation (type V): insulated ducts
1.5 Safety instructions
1.5.1 Safety in use
Warning:
wDo not put any objects into the inlets and
outlets.
Warning:
wDo not obstruct the unit’s inlets or outlets.
Warning:
wThe upper surface of the unit becomes hot
during operation.
Warning:
wThe maximum environmental temperatures
during operation are:
- in heating mode: 30°C

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1.5.2 Safety issues relating to installation, mainte-
nance and servicing
Danger:
dThe unit may only be opened by qualified
technical staff.
Warning:
wPerform the following actions before opening
the unit:
1. Switch the unit off,using the control panel.
2. Wait until the fan has stopped.
Danger:
dThe fan may continue rotating for a while.
3. Allow the unit to cool down.
Caution:
cThe heat exchanger or, as the case may be, the
heating elements, can get very hot.
4. Disconnect the mains supply (switch off the isolation
switch).
5. For water-heated models:
shut off the central heating feed (if possible).
Warning:
wThe fins of the heat exchanger are sharp.
1.5.3 Transport
Prior to transporting the product, it should be removed and
stowed safely so as to not incur damage. The original packag-
ing should be used wherever possible and the product should
be protected from any significant temperatures or vibration.
1.5.4 Storage
The product must be stored in a dark, dry, frost free and well
ventilated place out of the reach of children. Storage tempera-
tures should be between 0-30 °C. The original packaging
should be used for long term storage.

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2Installation
2.1 Safety instructions
Warning:
wInstallation activities may only be performed
by technical staff qualified for this purpose.
Warning:
wBefore starting installation: read the safety
instructions.
2.2 Inspection on delivery
• Check the unit and the packaging to ensure that they have
been delivered in good order. Notify the driver and the
supplier immediately if any shipping damage is detected.
• Ensure that all components are present. Notify supplier of
any missing parts immediately.
2.3 General working method
2.3.1 Sequence of operations
1. Hang the unit up.
2. For models with water-heating (type H):
connect the unit to the central heating system.
3. In the case of models for cooling (type C):
Attach the condensate drain.
4. In the case of models with ventilation (type V):
Connect the unit to the air ducts.
5. Connect the unit to the mains supply.
6. Install the control panel and (any optional) connections to
external controls.

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7. Complete the installation of the unit.
8. Switch the mains supply on and check that the unit is
working properly.
General instructions
Some parts of this section only apply to certain models.
Where this is the case, it will be indicated. If no specific model
is referred to, then the description applies to all models.
Note:
nMake sure that you perform all installation
operations that are applicable to your unit.
Check the type plate and consult the manual if in
doubt about the model or type of your unit.
Note:
nDuring the installation period, protect the unit
against damage and penetration of dust, cement, etc.
You can, for instance, use the packaging for
protection.
2.4 Hanging the unit up
2.4.1 Positioning the unit
Warning:
wMake sure that the structure from which the
unit is about to be suspended can hold the
weight of the unit. The weight is specified on
the type plate.
Warning:
wThe minimum mounting height is 2.0 m.

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• Ensure the following:
- Position the unit between the ceiling profiles.
- Pay attention to the unit’s orientation in the room (it is
possible to adapt the discharge pattern to the room).
- The maximum mounting height for the unit is 3.5 m.
(measured from floor to ceiling).
Caution:
cThe ceiling tiles should not rest on the cover.
Instead, use the T-beams of the suspended ceiling or
use the optional edge sections.
Note:
nAfter hanging the unit, it is no longer possible to
change the orientation of the cover.
Note:
nProvide for an inspection hatch in the ceiling if the
Comfort Circle is not fitted in a suspended ceiling.
Note:
nMounting the unit above the maximum height may
affect the proper working of the unit.

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2.4.2 Suspending and securing the unit
1. Mount Flamco rails 1 and fit threaded rods M8 1 accord-
ing to the dimensions in the table
Caution:
cMake sure the threaded rods are perpendicular.
2. Mount the suspension profiles 3 to the threaded rods.
3. Hook the unit into the suspension profiles.
4. You can still change the position of the unit somewhat by
moving it in the suspension profiles and Flamco rails.
5. Secure the suspension on both sides using the securing
brackets 4.
Warning:
wThe unit may come down if you do not secure
the suspension.
6. Bring the underside of the unit in line with the T-beams of
the ceiling..
Caution:
cEnsure that the unit is level.
2.5 Units with thermostatic control
1. Connect the unit to the CH system – the flow and return
paths are indicated by labels on the product.
2. Fill and bleed the system.
3. Check any compression joints for signs of weeping and
tighten where appropriate.
Dimensions for suspending the unit
REFERENCE DIMENSION
a as needed
b 670 - 750 mm
c CC 60 600 mm

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Note:
nThe valve supplied with the unit is thermostatically
operated by the discharge air to ensure the product
won’t overheat. Do not remove this from the unit.
Failure to do so may result in a shortened product
life.
2.6 Installing the thermostats
Note:
nThis product can be supplied with a variety of
different control options to suit customer's
requirements. Some of the below may or may not be
relevant to your unit.
2.6.1 Controls Overview
The product can be supplied with the following controls:
• T1 - On/off thermostat
• T2 - Speed change thermostat
• T4 - Variable temperature pipe thermostat
• Remote switches - Wall mounted switches to allow the
occupant to select the fan speeds and bypass the T4 (if fit-
ted)
2.6.2 T1 & T2 Installation
Note:
nT1 and T2 are available in adjustable and
tamperproof styles, please contact the sales office
for more information.
1. Fix the thermostats to the wall at a height of approxi-
mately 1.5m from the floor away from any draughts or heat
sources such as radiators, direct sunlight or windows.
2. Wire up as per the wiring diagram supplied with the prod-
uct.
2.6.3 T4 Installation
1. Wire the T4 as per the wiring diagram supplied with the
product

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2. Fix using the supplied cable tie to the flow connection
before any control valves
3. Set to between 40-45 °C
Note:
nConnecting the T4 to the return pipe will result in
constant switching of the unit and poor heating.
2.7 Adjusting fan speeds
The product is supplied with a 0-10V variable speed EC fan
that is factory set to operate at 4V (low), 5V (medium), 6V
(high). These speeds can be adjusted on site if need be to
either increase fan speed (in conjunction with heating duty and
noise levels) or decrease the fan speed (reduction in heating
duty and noise). Please contact the sales office for information
on how the performance is affected and how the speeds can
be changed.
2.8 Connecting the unit to the central heating system
2.8.1 Special points regarding the water connection
The central heating system’s supply and return pipes must be
attached to the correct corresponding connectors. On the
unit, the directions are indicated with arrows.
Warning:
wUse only compression fittings to connect the
unit to the system.
SYMBOL
FEED PIPE
SYMBOL
RETURN PIPE
arrow points towards the
connection
arrow points away from the
connection

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Caution:
cBiddle recommends the inclusion of a shut off valve
in both pipes.
Caution:
cThe electronics module must remain accessible. The
distance between the pipes 2 and the electronics
module 1 must be at least 200 mm.
Danger:
dTake measures to limit the discharge
temperature.
Take account of the critical discharge
temperatures and water flow-paths indicated
in the section Field of application.
Note:
nThe central heating system must be fitted with an
overpressure cut-out with an initial pressure not
exceeding the permitted pressure of the unit. This is
shown on the type plate at Pmax.
Note:
nMake sure that the central heating system has
sufficient capacity.
2.8.2 Connecting the unit
1. Connect the unit to the central heating system.
2. Vent the heat exchangers.
3. Check the connections for leakage.
Connection sizes of fittings.
TYPE COMPRESSION FITTING
CC 60 ø22 mm

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2.9 Connecting the mains supply
2.9.1 Special points regarding the mains supply
Warning:
wDo not turn unit ON/OFF at its power supply.
Use the control panel.
Warning:
wThe unit must be earthed.
Warning:
wThe unit must be connected in accordance
with the applicable local requirements.
• The unit fuse is 1.6 A.
• Ensure that an (earthed) power socket is available at a
maximum of 1.5 m from the left side of the unit.
Note:
nThe power socket must remain accessible after
installation so that the unit can be disconnected for
service and maintenance.

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2.10 Mounting the cover
1. Remove the air inlet grille by turning it anticlockwise (bay-
onet catch).
2. Fit the supplied screws 3 and anti-loss rings 4 into the
cover.
3. Mount the cover into the unit:
- Hook the cover into the unit using the metal lips;
- Tighten the screws in the indicated order.
Caution:
cEnsure that the projection 6 of the unit falls into
the recess 7 of the cover. The cover fits to the unit
in only one way.
4. Put back the air inlet grille.
2.11 Adjusting the discharge pattern
The discharge pattern can be adjusted to the room using the
supplied blind plates.1.
Caution:
cIf use is made of the air connection for an adjoining
room, the two blind plates must be mounted in the
two holes on the side of this connection 2.
Caution:
cDo not mount more than two blind plates per unit.

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1. Remove the air inlet grille 3 by turning it anticlockwise
(bayonet catch).
2. Place the blind plate 4 into the desired opening, and fix it
with the supplied screws.
3. Replace the air inlet grille.