Series AM - Dunham-Bush Fan Coil Units

S E R I E S A M F A N C O N V E C T O R S
• Including AM Comfort, Avant-Garde & LST ranges
• Range of 22 standard models in 7 sizes
• 4
LPHW heating coil options giving 1-13kW outputs with
LPHW 50-130°C or Electric heating up to 6kW
• EC energy efficient fan motors or conventional AC motors
• Thermostatic and user control options
1
Contents
IDENTIFICATION
PAGE
IDENTIFICATION2
Introduction2
Authority 2
DESCRIPTION2
Range
2 & 4-5
Composition – Features
3
Accessories
6-7
PERFORMANCE8-9
Heat outputs of LTHW
Correction factors
Heat outputs of Electric
Electrical data
Coil capacities
Heater mass
8
8
9
10
32
32
APPLICATION11
General11
Selection12
Dimensions13-28
Engineering Specification 29-30
CONSTRUCTION32
Handling32
Storage 32
Preparation
32
Installation details
32
Pipework connections 32
Electrical connections 32
Typical wiring diagram
31
Ceiling & wall brackets 33
PRICES & CONDITIONS
of SALE
Prices
Conditions of Sale
TECHNICAL SUPPORT
SERVICES
Product support
SUPPLY
34
34
34
34
34
34
Availability
34
Packaging
34
Delivery to site
34
Ordering34-35
Introduction
This product catalogue provides comprehensive information about Series
AM Comfort fan convector heaters and guidance on selection, application,
use and supply.
Each heater consists of a casing, motor/fan platform, air filter and heating
coil. Depending upon the model, grilles are either fitted to the casing or
can be supplied loose for fitting by others.
Heaters provide warm air heating, when connected to a ultra low, low or
medium temperature hot water system and a single phase electrical supply.
A extensive product description code is used to identify heaters and
accessories. Each heater manufactured has a unique serial number.
Authority
Dunham-Bush operates a quality control system and is a registered firm of
assessed capability BS EN ISO 9001 : 2008.
DESCRIPTION
Each Series AM Comfort fan convector comprises a sheet metal casing with
lockable access panel, synchronous AC or energy efficient EC fan motor, air
filter and hot water heating coil. A single phase electric heater coil can be
supplied instead of the hot water coil on heaters with an output up to 6kW.
Depending upon the model selected, grilles are either fitted to the casing
or can be supplied loose as an accessory, for internal use.
Heaters are supplied for single or dual fan speed operation. Single speed
heaters are set to low, medium or high speed. Dual speed heaters are set
to low/medium, low/high or medium/high speeds. Fan/heat control is by
means of switches and/or thermostats, listed in the Accessories section of
this Product Catalogue.
Range
The range consists of 22 standard models, arranged in 4 groups – floor,
wall, ceiling and fixed duct or adjustable height duct, as illustrated in the
Range of Standard Models.
All models can be supplied in a range of figure numbers. The figure
number relates to the nominal heat output and length, as shown below.
Figure number
Nominal output
(kW)
Casing length
(mm)
03
2.6
695
04
4.5
895
06
6.0
895
08
8.5
1195
10
9.8
1195
12
11.0
1495
15
12.5
1495
Nominal outputs are based on WA2 coil, LTHW flow & return
temperatures of 80/70˚C, and an entering air temperature of 18˚C
2
COMPOSITION - FEATURES
extruded pencil proof
discharge grille
heater casing
Model 13 figure number 4
(left hand connections)
access panel with
locks
low temperature
cut-out*
inner cover
air vent**
heating coil
mains inlet connector
coil connections
motor/fan platform
line connector
isolating valves*
extruded pencil proof
recirculation grille
pipework cover plate
washable air filter
air thermostats*
Items marked * are accessories.
**Air vent options – type M manual, behind the access panel
type A automatic, behind the access panel
type P plugged tapping
switches*
3
RANGE OF STANDARD MODELS
Note: Models 13, 15, 16, 17, 19, 25 & 88 are manufactured as bottom connection unless otherwise specified,
models 37, 41, 38, 52 & 53 are top connection only.
4
RANGE OF STANDARD MODELS
Note: Models 20, 21, 22 & 23 are bottom connection unless otherwise specified,
models 60 & 92 are top connection unless otherwise specified, models 28, 30, 31 & 34 are as drawn.
5
ACCESSORIES
Fan motors
As well as conventional synchronous AC motors, energy efficient EC motors
are also available. EC motors can be provided with a fitted three speed
potentiomer board (option EC2) allowing discrete speeds to be selected via
air thermostats or switches. Alternatively EC speed control can be provided
by an external 2-10VDC signal (option EC1).
Air thermostats
Air thermostats can be provided to automatically switch the heater on/off
and/or to change the fan speed/heat output, in response to a fall or rise in
ambient air temperature.
Fitted air thermostats, Models 13, 15, 17, 20, 21, 23 and 25 only
Capillary thermostats or room thermostats with accelerator heater, can be
fitted for on/off and speed change control.
EC fan motor
Remote thermostats
Standard or tamper resistant room thermostats with accelerator heater, can
be provided for on/off and speed change control.
Low temperature cut-out thermostat (LTC)
A low temperature cut-out thermostat can be provided to prevent the
heater operating until the heating water temperature is hot enough for it
to work efficiently. This thermostat will automatically stop the heater at the
end of the normal operating period, when the boiler plant closes down.
Type 1, fixed setting LTC, break circuit 38˚C±3K, make circuit 50˚C±3K
If fitted, type 1 is wired into the control circuit and clamped to the coil
tube nearest to the LTHW flow connection. Note, maximum operating
temperature of 95˚C
Fitted on/off and speed change
capillary thermostats
Type 2, adjustable setting LTC, range 30˚C to 90˚C.
If supplied, type 2 is wired into the control circuit and stored inside of the
heater casing, for clamping to the LTHW flow pipe by the installer. Note,
maximum operating temperature of 95˚C
Switches
Fitted external, internal or remote room switches can be provided to
switch the heater on/off, change fan speed, allow thermostats to work
automatically or to override any thermostats. The override “manual”
switch allows the fans to circulate room air when the boiler plant is shut
down during the summer. A switch can also be provided to open or close
motorised dampers (models 19, 22, 53 and 88 with motorised damper).
Fitted fixed setting ‘type 1’ LTC
Fitted switches 1. on/off, 2. high/off/low, 3. manual/off/auto, 4. manual/
off/auto and high/low, 5. FAI/recirc., 6. FAI/recirc. and high/off/low, 7. FAI/
recirc., and manual/off/auto, 8. FAI/recirc., manual/off/auto and high/low.
Please note: a) fitted switches are not recommended for ceiling and wall
mounting models, due to inaccessibility. b) FAI refers to fresh air inlet.
Remote switches-surface or flush mounting 1. on/off, 2. high/off/low, 3.
manual/off/auto, 4. manual/off/auto and high/low, 5. FAI/recirc., 6. FAI/
recirc. and high/off/low, 7. FAI/recirc. and manual/off/auto, 8. FAI/recirc.,
manual/off/auto and high/low.
6
Fitted high/low and manual/off/
auto switches
ACCESSORIES
Motorised damper
Damper models 19, 22, 53 and 88 can be provided with a 230V AC damper
motor as a standard option. 24V AC damper motors are available if
specially requested.
Electric heating
All models, figure numbers 3, 4 and 6 only, can be fitted with a single
phase, single stage electric heating module, instead of the standard hot
water heating coil. The module includes electric element(s), power relay,
high temperature cut-out and miniature circuit breakers. Please refer to the
Performance section of this catalogue for outputs of models with electric
heater modules.
Note: Control options for electric heating are limited by EU legislation; refer
to pages 34 & 35.
Electric heating
Special controls
Various special control arrangements can be supplied to suit particular
applications. A 24V AC relay can be fitted, to allow a heater to be switched
on/off remotely by a controlled 24V AC supply.
24V AC relays can also be fitted, to allow master/slave operation of several
fan convectors from one pair of room thermostats. Please contact our local
Agent/Sales Engineer for details.
Fitted plinth
A 100mm or 150mm plinth, finished in black powder coating, can be fitted
to all floor and duct models, to raise the heater above the finished floor
level.
Fitted plinth
Fitted isolating valves
DN20(3/4 BSP.) isolating ball valves or gate valves, can be provided fitted
within the casing.
Pencil proof loose grille and fixing frame
Pencil proof loose grilles with fixing frames can be provided for use with
heaters which do not have fitted grilles. The fixing frame is intended for
installation in a wall opening, allowing the loose grille to be fixed to the
frame with screws, which are recessed between the grille blades. A loose
grille has a natural anodised surround and black powder coated grille core.
Loose grilles are unsuitable for external use. Proprietary weatherproof
louvres are recommended where outside air is to be introduced.
Fitted isolating ball valves
Special colours and finishes
The standard casing finish is powder coated white RAL 9010 30% Gloss.
As an option, heater casings can be supplied powder coated to a colour
and finish from our preferred range. A colour chart is available on request.
Other BS 4800 and RAL colours are also available, subject to quantity.
Please contact our local Agent/Sales Engineer.
Note: when a special colour finish is applied to the casing, any fitted grilles
and the back of the heater will be finished standard black, unless otherwise
specified.
Loose grille and fixing frame
7
PERFORMANCE
Heat outputs (kW), air volume flow rates (l/s), leaving air temperatures (˚C) and hydraulic resistances (kPa).
Conditions:LTHW 75˚C mean, 10K drop across the coil at all speeds, entering air temperature 18˚C.
Table 1 Heat outputs LPHW WA2 heating coil
Figure
coil type
number
low speed
medium speed
kW
l/s
°C
kPa
kW
l/s
high speed
°C
kPa
kW
l/s
°C
kPa
03
WA2
1.7
50
46
0.28
2.6
75
47
0.62
3.9
110
45
1.16
04
WA2
3.1
75
52
1.00
4.5
110
52
2.03
5.9
150
51
3.37
06
WA2
4.3
105
52
1.86
5.9
150
51
3.37
6.6
175
49
4.13
08
WA2
5.2
130
51
1.31
8.5
220
50
1.25
9.9
275
48
1.68
10
WA2
8.1
205
51
1.14
9.8
270
48
1.64
10.3
290
48
1.81
12
WA2
8.6
210
52
1.45
11.1
280
51
2.35
13.0
350
49
3.17
15
WA2
11.1
280
51
2.35
12.5
330
50
2.93
13.0
350
49
3.17
Table 2 Heat outputs LST WA1 heating coil & special MTHW applications
Figure
coil type
number
03
WA1
low speed
medium speed
high speed
kW
l/s
°C
kPa
kW
l/s
°C
kPa
kW
l/s
°C
kPa
1.4
50
41
0.2
2.1
75
41
0.4
2.9
110
40
0.8
04
WA1
2.2
75
42
0.5
3.3
110
43
1.1
4.2
150
41
1.8
06
WA1
3.1
105
43
1.0
4.2
150
41
1.8
4.7
175
40
2.2
08
WA1
3.6
130
41
0.7
6.1
220
41
1.8
7.0
275
39
2.3
10
WA1
5.8
205
41
1.6
6.9
270
39
2.3
7.2
290
39
2.5
12
WA1
6.2
210
43
2.0
8.0
280
42
1.3
9.2
350
40
1.6
15
WA1
8.0
280
42
1.3
8.4
330
40
1.5
9.2
350
40
1.6
Table 3 Heat outputs low grade LPHW WA3 heating coil
Figure
coil type
number
03
WA3
low speed
medium speed
high speed
kW
l/s
°C
kPa
kW
l/s
°C
kPa
kW
l/s
°C
kPa
2.6
50
61
0.6
3.9
75
61
1.3
5.5
110
59
2.6
04
WA3
4.0
75
63
1.6
5.9
110
62
3.3
7.8
150
61
3.8
06
WA3
5.6
105
63
3.0
7.8
150
61
3.8
8.8
175
60
4.8
08
WA3
6.8
130
62
2.2
11.2
220
60
2.1
13.3
275
58
2.9
10
WA3
10.6
205
61
1.9
13.1
270
58
2.8
13.9
290
58
3.1
12
WA3
11.2
210
62
2.4
14.7
280
61
3.9
17.4
350
59
5.5
15
WA3
14.6
280
61
3.9
16.7
330
60
5.0
17.4
350
59
5.5
WA3 coils should be used with caution, since high leaving air temperatures can cause stratification of treated air.
Dunham-Bush recommend leaving air temperatures are limited to 50°C.
Table 4 Correction factors for WA1, WA2 & WA3 coils
Approximate factors for heat output and hydraulic resistance, at various mean water temperatures, entering air
temperatures and water temperature drops across the coil.
Mean water
(°C)
60
65
70
75
Water temperature drop across coil
Entering air
temperature
(°C)
Output
Hyd. Res.
Output
Hyd. Res.
Output
Hyd. Res.
Output
Hyd. Res.
0
1.08
4.68
1.04
1.09
-
-
-
-
18
0.75
2.23
0.70
0.49
-
-
-
-
20
0.71
2.05
0.66
0.44
-
-
-
-
0
1.18
5.53
1.14
1.30
1.10
0.54
-
-
18
0.84
2.83
0.80
0.65
0.74
0.24
-
-
20
0.80
2.59
0.77
0.59
0.70
0.22
-
-
0
1.27
6.44
1.24
1.54
1.20
0.64
1.16
0.37
18
0.94
3.51
0.90
0.81
0.85
0.32
0.81
0.14
20
0.90
3.23
0.86
0.75
0.81
0.29
0.76
0.12
0
1.37
7.47
1.34
1.78
1.31
0.76
1.26
0.40
18
1.03
4.25
1.00
1.00
0.96
0.41
0.90
0.20
20
0.99
3.95
0.96
0.93
0.93
0.38
0.86
0.18
5k
10k
8
15k
20k
PERFORMANCE
Heat outputs (kW), air volume flow rates (l/s), leaving air temperatures (˚C) and hydraulic resistances (kPa).
Conditions:LTHW 45˚C mean, 20K drop across the coil at all speeds, entering air temperature 18˚C.
Table 5 Heat outputs ultra low grade LPHW WA4 Avant-Garde heating coil
low speed
medium speed
high speed
Figure
number
coil
type
kW
l/s
°C
kPa
kW
l/s
°C
kPa
kW
l/s
°C
kPa
03
WA4
1.6
50
44
0.6
2.4
75
44
1.3
3.3
105
44
2.4
04
WA4
2.5
75
46
1.9
4.0
115
46
4.2
5.4
160
46
7.4
06
WA4
3.6
105
46
3.5
5.1
150
46
6.7
6.0
180
46
8.9
08
WA4
4.2
135
44
0.9
6.7
210
44
2.0
8.5
270
44
3.1
10
WA4
6.1
190
44
1.7
7.9
250
44
2.8
9.1
290
44
3.6
12
WA4
6.9
205
46
3.1
9.9
290
46
5.9
11.9
360
45
8.2
15
WA4
9.3
270
47
5.3
11.2
335
46
7.4
12.0
360
45
8.2
*Hydraulic resistance includes control valve
Table 6 Correction factors for WA4 coils only
Approximate factors for heat output and hydraulic resistance, at various mean water temperatures, entering air
temperatures and water temperature drops across the coil.
Mean water
(°C)
Water temperature drop across coil
Entering air
temperature
(°C)
45
50
55
60
65
10k
15k
20k
0
Output
1.68
Hyd. Res.
6.6
Output
1.68
Hyd. Res.
3.3
Output
1.68
Hyd. Res.
2.1
18
1.00
2.7
1.03
1.5
1.00
1.0
20
0.93
2.4
0.95
1.4
0.92
0.9
0
1.86
7.7
1.86
3.9
1.86
2.4
18
1.18
3.5
1.21
1.9
1.20
1.3
20
1.11
3.2
1.14
1.8
1.12
1.1
0
2.12
9.5
2.09
4.7
2.05
2.8
18
1.37
4.5
1.40
2.4
1.40
1.5
20
1.28
4.1
1.33
2.2
1.33
1.4
0
2.34
11.1
2.29
5.4
2.25
3.2
18
1.58
5.7
1.59
2.9
1.60
1.8
20
1.51
5.3
1.52
2.7
1.52
1.7
0
2.52
12.6
2.51
6.1
2.43
3.6
18
1.78
6.9
1.78
3.4
1.78
2.2
20
1.71
6.4
1.71
3.2
1.71
2.0
Table 7
Valve and pipework connections for Avant Garde WA4 with control valves and isolating valves.
Model
Possible
connections
Fitted
isolating
ball valve
Model
Possible
connections
Fitted
isolating
ball valve
AM13
B&R
B2
AM30
R
N/A
AM15
B&R
B2
AM31
R
N/A
AM16
B&R
B2
AM34
R
N/A
AM17
B&R
B2
AM37
R & B1
B1
AM19
B&R
B2
AM38
T&R
B2
AM20
T, B & R
B2
AM41
R & B1
B1
AM21
T, B & R
B2
AM52
R
N/A
AM22
T, B & R
B2
AM53
T&R
B2
AM23
T, B & R
B2
AM60
T, B1 & R
T & B1
AM25
B&R
B2
AM88
B&R
B2
AM28
R
N/A
AM92
T, B1 & R
T & B1
9
Notes:
1. B = bottom connection
2. T = top connection
3. R = rear connection with
valve assembly supplied
loose
4. B1 = bottom connection
possible but pipe entry is
opposite to coil handing
5. B2 = Isolating valve
pipework
is flush with bottom plate;
plinth recommended
PERFORMANCE
Table 8 Heat outputs – Electric heating
Heat outputs (kW), air volume flow rates (l/s), leaving air temperatures (˚C)
Conditions: 230/240 Volts, single phase, 50 Hertz, entering air temperature 18˚C.
Figure
number
coil type
kW
low speed
stages
l/s
medium speed
°C
l/s
high speed
°C
l/s
°C
03
E15
1.5
1x1.5
75
35
110
29
03
E30
3.0
1x3.0
75
51
110
41
04
E20
2.0
1x2.0
04
E30
3.0
1x3.0
04
E40
4.0
1x4.0
06
E50
5.0
1x5.0
06
E60
6.0
1x6.0
Electric heating
not reccomended
on low speed due
to high leaving air
temperatures
110
33
150
29
110
41
150
35
110
48
150
40
150
46
175
42
150
51
175
47
Table 9 Sound Data
Figure number
03
04
06
08
10
12
15
Approximate NR level at low speed based on a
8×8×2.7m room with average acoustic conditions
(reverberation time typically= 0.7 to 1.0 seconds)
23
23
29
30
39
40
46
Sound data
Series AM fan convectors are ‘commercially quiet; sound power levels are available on request and may be used to
calculate NR or NC.
Table 10 Electrical data for AC motors
Low Speed
Fig No.
Fan
Voltage
(VAC)
Airflow
(l/s)
Running
current
(A)
Medium Speed
SFP
(W/l/s)
Fan
Voltage
(VAC)
Airflow
(l/s)
Running
current
(A)
High Speed
SFP
(W/l/s)
Fan
Voltage
(VAC )
Airflow
(l/s)
Running
current
(A)
SFP
(W/l/s)
3
100
50
0.20
0.40
130
75
0.34
0.48
180
110
0.31
0.55
4
100
75
0.25
0.37
140
110
0.34
0.47
180
150
0.40
0.53
6
130
105
0.38
0.44
180
150
0.40
0.53
210
175
0.44
0.56
8
100
130
0.39
0.31
150
220
0.51
0.37
180
275
0.52
0.35
10
130
205
0.46
0.33
180
270
0.52
0.36
210
290
0.52
0.39
12
140
210
0.52
0.38
180
280
0.60
0.40
240
350
0.64
0.46
15
180
280
0.60
0.40
220
330
0.63
0.42
240
350
0.64
0.46
Table 11 Electrical data for EC motors (using EC2 fitted control board)
Low Speed
Fig No.
Control
Signal
(VDC)
Airflow
(l/s)
Running
Current
(A)
Medium Speed
SFP
(W/l/s)
Control
Signal
(VDC)
Airflow
(l/s)
Running
Current
(A)
High Speed
SFP
(W/l/s)
Control
Signal
(VDC)
Airflow
(l/s)
Running
Current
(A)
SFP
(W/l/s)
3
3.4
50
0.08
0.16
4.6
75
0.14
0.19
6.2
110
0.26
0.26
4
3.5
75
0.10
0.13
5.5
110
0.20
0.20
7.5
150
0.40
0.30
6
5.2
105
0.18
0.19
7.5
150
0.40
0.30
8.8
175
0.54
0.38
8
3.4
130
0.16
0.12
5.8
220
0.40
0.21
7.1
275
0.64
0.27
10
5.4
205
0.35
0.19
7.0
270
0.64
0.27
7.7
290
0.77
0.31
12
4.4
210
0.30
0.16
5.8
280
0.54
0.22
7.0
350
0.82
0.27
15
5.8
280
0.54
0.22
6.7
330
0.60
0.21
7.0
350
0.82
0.27
10
APPLICATION
General
The versatile range of 22 standard models each
produced in four casing lengths and with two hot
water coil types, allows Series AM fan convectors
to be used for many applications, such as: Schools,
Colleges, Homes for Elderly People, Libraries, Offices
and Churches.
When the air in the room is at the required
temperature and the fans are either automatically or
manually switched off, the fitted 4 port valve diverts
hot water away from the coil eliminating the problem
of unwanted natural convection increasing the
discharge grille temperature.
From the range of standard models, it can be seen
that there are models suitable for floor, wall and
ceiling mounting within the room being heated.
Models 15, 23, 41 and 92 are intended for installation
in an adjacent room. Where it is necessary to conceal
heaters within the building fabric or ceiling void,
we recommend our basic uncased Series BM fan
convectors.
A 4 port valve is supplied as standard, however a 2
port valve is an available option, thus enabling variable
flow pumps to be used to optimise energy efficiency.
Note that low temperature cut out (LTC) thermostats
cannot be fitted on 2 port valve applications.
The combination of the specifically developed coils
and fitted valve ensures that the casing and discharge
grille of the heater do not exceed the surface
temperature of 43°C required by NHS guidelines;
providing total compliance with Health Guidance Note
‘Safe’ hot water and surface temperatures.
Models 19, 22, 53 and 88 can be used for heating,
ventilating and ‘free cooling’ as they allow the
introduction of tempered primary or outside air
through the fan convector. These models have a
manually operated damper but a motorised damper
can be fitted as an accessory, during manufacture.
Avant-Garde Application
The Dunham-Bush Avant-Garde unit is designed
to operate at 55°C flow and 35°C return, whilst
maintaining the same duty, options and features
as the extensive range of Series AM Comfort fan
convector heaters.
If outside air is to be introduced during the heating
season, the hot water coil must have frost protection.
Weatherproof louvres must be supplied by others.
Care should be taken to ensure heaters are sited
so that there are no obstructions directly in front
of them, which could affect air circulation. This is
particularly important when using reversed air flow
models 37 and 41, and any model with electric
heating.
Benefits:
Ceiling mounted models 28, 30, 31 and 34 are
generally less effective than floor mounted models,
since the entering air temperature is higher at ceiling
level and the warm buoyant discharge air may cause
stratification and take longer to produce comfortable
conditions at occupancy level. For these reasons, we
recommend floor or wall mounted models, where the
application allows.
LST Application
With many years of experience in the UK heating
industry, Dunham-Bush has recognised the need for
a forced convection low surface temperature (LST)
unit capable of delivering duties far in excess of those
associated with natural LST convectors.
The AM Comfort LST heaters provide the end user
with a fan convector that delivers all the functionality
and reliability of the much acclaimed products in the
existing Dunham-Bush ranges. This, coupled with
the assurance that NHS guidelines for safe touch
temperatures are being met, ensures that fast and
efficient heating can be delivered into safety critical
areas.
11
•
Boiler return temperature is always below
55°C ensuring the boiler is in condensing
mode at all times.
•
Increased differential water temperatures
across the coil, reduces pumping energy by up
to 87%.
•
Decreased flow and return temperatures
reduce standing losses from pipework.
•
Low water content and thermal mass of unit
allows rapid response preventing a protracted
warm-up period and temperature overshoot.
•
Integral 4-port valve prevents wasteful natural
convection during mild conditions (2-port
valve option available upon request).
•
Please refer to catalogue PDS1000-H-0237-02 for additional information on
internal valve orientation & fitting exclusions.
SELECTION
Comfortable conditions throughout the heated
space are achieved by good air circulation. It is
recommended that wherever possible, the total
volume of the room should be circulated through the
sum of the heaters in the room, four to five times per
hour.
Refer to the range of standard models to select the
model most suitable for the particular application.
From the calculated heat loss and the operating
conditions, the quantity of heaters, heat output, figure
number and coil type can be selected, using the
Performance tables. If the operating conditions are
different to those stated, use the appropriate factor.
Using factors – example
To calculate the approximate heat output, hydraulic
resistance and leaving air temperature of a Series AM
figure 08 heater fitted with a WA2 coil, operating at
medium speed with LTHW 50˚C mean, a 10K drop and
an entering air temperature of 18˚C.
For large rooms, it is usually better to select two small
heaters, rather than one large one, to give better heat
distribution and lower spot noise levels. Whenever
possible, heaters should be located near windows or
in areas of disproportionately high heat loss.
It is recommended that heaters are selected to
operate at medium speed for general use or at low
speed for rooms where noise levels are particularly
important. Heaters should only be selected at high
speed for non critical applications, such as entrance
foyers, corridors etc. or for initial rapid warm up.
Sound power levels are available on request.
a) From table 1, heat output 8.49kW , air volume flow
rate 220 l/s, hydraulic resistance 1.25 kPa
b) From table 3, heat output factor 0.50, hydraulic
resistance factor 0.28.
c) Heat output 8.49kW x 0.50 = 4.25kW Hydraulic
resistance 1.25kPa x 0.28 =0.35kPa
d) To estimate the leaving air temperature with the
new output, find the temperature rise ∆t, and add
it to the entering air temperature
4.25kW
∆t = = 16˚C + 18˚C = 34˚C
220 l/s x 0.00122kJ/l˚C
By design, Dunham-Bush fan convectors have
moderate leaving air temperatures, low outlet
velocities and low air throws.
(Where 0.00122 is an approximation, derived from the specific volume
and specific heat capacity of the entering air.)
Model 25 with optional plinth.
12
DIMENSIONS
13
DIMENSIONS
14
DIMENSIONS
Model 19
15
DIMENSIONS
16
DIMENSIONS
Model 20Model 23
17
DIMENSIONS
18
DIMENSIONS
19
DIMENSIONS
20
DIMENSIONS
21
DIMENSIONS
22
DIMENSIONS
Model 31
23
DIMENSIONS
24
DIMENSIONS
25
DIMENSIONS
26
DIMENSIONS
27
DIMENSIONS
28
DIMENSIONS
29
ENGINEERING SPECIFICATION
The Series AM fan convector heater shall be
manufactured by Dunham-Bush Limited, Downley
Road, Havant, Hampshire, PO9 2JD. The models,
figure numbers and quantities shall be as indicated
in the schedule and/or on the drawings. The
construction of all heaters must comply with the
following specification.
Heating coil
General
The coils for all models except those noted below,
shall be provided with a type M manual air vent or
type A automatic air vent, located behind the access
panel. Air vent type must be specified. Models 37,
38, 41, 52, 53, 60 and 92 shall have type P plugged air
vent and top connections.
Coils shall be constructed from 9.35mm. O.D. solid
drawn copper tubes, expanded into single plate
corrugated aluminium fins and brazed to copper
headers. Flow and return connections shall be Rp20
to ISO7/1 (3/4 BSP female parallel). Coils less air
vents shall be tested to 24bar gauge.
Each heater shall consist of a sheet metal casing
with access panel, heating coil, motor/fan platform,
autotransformer and air filter. Where appropriate to
the model, grilles shall be fitted to the casing.
Casing construction
Site working and test pressures
Casings shall be constructed from 1.2mm mild steel
panels, adequately stiffened to minimise distortion.
All casings shall have rounded edges, for increased
safety. Each casing shall have an access panel secured
with locks.
Coils fitted with air
vent
Maximum cold test
pressure Barg
Maximum working
pressure Barg
M
10.5
7.0
A
9.0
7.0
P
24.0
7.0
All ceiling model access panels shall be complete with
safety screws. Casings shall be designed to accept
pipework and isolating valves.
Flattened knockouts shall be provided in the casing,
for pipework and conduit entry.
Table: 12
When specified, a 100mm or 150mm high plinth shall
be fitted to the bottom of floor and duct models.
Air filters shall be washable, composed of thermally
bonded polyester fibres. Filters shall be BS EN 779,
class G2(EU2).
Casing dimensions
Motor/fan platform
Air filter
Floor mounting and duct models shall be 230mm
wide. Wall models shall be 242mm wide. Ceiling
models shall be 253mm high. Wall and ceiling
models shall include suspension brackets.
Overall lengths shall be:
figure number 03 – 695mm,
figure numbers 04 and 06 – 895mm,
figure numbers 08 and 10 – 1195mm,
figure numbers 12 and 15 – 1495mm.
Motor/fan platforms shall be manufactured from
1.6mm galvanised steel and shall be fitted with
galvanised steel fan housing(s), resiliently mounted
motor and centrifugal fan(s).
Motor wiring shall be complete with a four-way line
connector. The platform shall be suspended within
theheater casing on resilient channels and shall be
removable by sliding out.
The height of floor, duct and wall models, and the
width of ceiling models shall be dependent upon
the model selected. Casing dimensions shall have a
manufacturing tolerance of ±1mm.
Fitted grilles
All fitted grilles shall be pencil proof, manufactured
from extruded aluminium alloy section, having 13
blades per grille.
Casing and grilles finish
All mild steel casing components, castings and
grilles shall be pre-treated before the application
of polyester powder coating. Casing: colour white
RAL9010 30% gloss. Grilles: colour black 00 E 53,
10% gloss. Colours to BS4800:1989. Other colours
required upon request.
30
ENGINEERING SPECIFICATION
AC motor and Fans
Motors shall be quiet running, resiliently mounted,
capacitor start and run, totally enclosed, having class
‘B’ insulation and rated in accordance with BS5000
part 11.
Motors shall have ‘sealed for life’ ball bearings. AC
units shall be suitable for 230Vac, single phase, 50 Hz
nominal supply only. Each fan shall be DIDW forward
curved, statically and dynamically balanced, secured to
the fan motor shaft by a grub screw. Figure number
03 shall be provided with one fan, all other figure
numbers shall be provided with two fans.
An auto-transformer shall be fitted within the heater
casing to provide effective fan motor speed control.
Transformers shall be wired to provide one or two
speeds from the range low, medium and high. An
isolated 24V AC (30VA) supply shall be available.
EC (Electronically Commutated) motor
and Fans
Motors shall be quiet running “3-phase dc” type with
resilient mounts to minimise noise and vibration.
Winding insulation shall be rated to Class ‘B’ and
bearings shall be ‘sealed for life’.
Units require a 200-277V 50 or 60Hz single phase
power supply.
Each fan shall be DIDW forward curved fan and these
shall be statically and dynamically balanced. Fan
speed control shall be affected by a 0-10Vdc control
signal to the motor(s). Figure number 03 shall be
provided with one fan, all other figure numbers shall
be provided with two fans.
Infinitely adjustable potentiometers within the unit
will enable the desired speed(s) to be achieved and
switched, as specified. Direct control of the motors by
a BMS, or other source, is available upon request.
Electrical connections and wiring
Each heater shall be provided with an IEC mains inlet
connector, complete with a 2A fuse, spare fuse and an
IEC mains inlet plug. The connector is located behind
the access panel, at the opposite end of the casing to
the hot water coil connections. Internal wiring shall be
tri-rated, high temperature PVC insulated 16/0.020.
31
CONSTRUCTION
Preparation
Handling
The purchaser is responsible for off loading. Heaters
are individually cartoned and three men can usually
handle the heaviest heater.
When a significant quantity of heaters is delivered,
they may be palletised and shrink wrapped, so a
fork lift truck or some form of lifting equipment is
desirable.
Care should be taken to ensure the heaters are not
dropped or knocked under any circumstances.
Make proper provision for fixings. The structure to
which heaters are to be fixed must be fit for purpose
and capable of accepting plugs and screws or drop
rods. Floor models require a level base. Floor and
wall models require a sound flat perpendicular surface. Heater casings are supplied with knockouts for
pipework and conduit entry.
Pipework connections
Coil connections are DN20 (3/4 BSP.) female
parallel. Local isolating and regulating valves are
recommended. Observe the correct flow and return
positions, to ensure the rated heat output.
Storage
Heaters should be stored under clean, dry conditions.
The cartons should not be removed until heaters are
required for installation, unless damage in transit is
suspected.
Note – the purchaser must examine the heaters
promptly upon receipt and any claims for damage
will only be accepted if, at the time of delivery, the
consignment note is endorsed with a note detailing
the damage and counter signed by the transport
driver.
Each heater is marked to show the model, figure
number, serial number and any reference given on
the order for site identification. This information also
appears on the consignment note.
Electrical connections
A 230/240 VAC, single phase 50 Hz supply must be
connected to the IEC mains inlet plug.
Any remote accessories must be connected as shown
on the wiring diagram supplied with the heater.
Wiring Diagram
A project specific wiring diagram is supplied
separately along with the installation instructions for
reference when connecting the remote components
where specified.
Installation details
Series AM fan convectors are supplied with a
copy of the Installation, Operation & Maintenance
Instructions, which provide full details for installing,
connecting and commissioning the unit. Additional
copies are available upon request, or can downloaded
from www.dunham-bush.co.uk.
Table 14 Coil capacities
Approximate volume of water in
LPHW coils, litres.
Table 13 Heater masses
Approximate shipping masses
Model
figure
number
03
figure
number 04/06
figure
number 08/10
figure
number 12/15
Figure
number
Coil types
WA1,WA2,WA3
Coil Type
WA4
03
0.63
1.2
04
0.77
1.6
06
0.77
1.6
08
1.03
2.1
13, 15, 16, 17, 31,
37, 41, 52
36 kg
45 kg
55 kg
65 kg
10
1.03
2.1
19
39 kg
49 kg
60 kg
71 kg
12
1.25
2.5
25
35 kg
44 kg
54 kg
64 kg
15
1.25
2.5
28, 30, 38
37 kg
46 kg
56 kg
66 kg
34
38 kg
47 kg
57 kg
67 kg
53
40 kg
50 kg
61 kg
72 kg
88
38 kg
48 kg
59 kg
70 kg
20, 21, 23, 60, 92
67 kg
83 kg
106 kg
122 kg
22
70 kg
87 kg
111 kg
128 kg
32
BRACKETS
33
PRICES & CONDITIONS
OF SALE
SUPPLY
Prices
Series AM fan convector heaters are supplied direct
from our manufacturing plant. The availability varies
with demand and should therefore be checked at the
time of ordering.
Availability
Dunham-Bush Ltd do not issue price lists but will be
pleased to supply a written quotation upon request.
Standard conditions of sale
Packaging
The standard conditions of sale appear on all
quotation and order acknowledgement forms.
Additional copies are available upon request
Heaters are packed in individual cartons.
Each heater is marked to show the model, figure
number, serial number and any reference given on
the order for site identification. This information also
appears on the consignment note.
TECHNICAL SUPPORT
SERVICES
Deliver to site
Series AM fan convectors are delivered to site in
accordance with our Conditions of Sale. The purchaser
is responsible for the off loading and proper safe
storage.
Product support
In the United Kingdom and Ireland, Dunham-Bush
has a network of Sales Agents, situated at strategic
locations, to provide local support.
Ordering
To allow us to process your order promptly, please
refer to any quotation we have supplied and any
relevant correspondence. Please send your order
to our Agent or Sales Engineer who provided the
quotation, remember to include the coil handings
as chasing infomation will delay the manufacturing
process.
Table 15: Remote item codes
Remote switches
Flush part number
Surface part number
on/off
121-601-010
121-601-001
high/off/low
121-601-011
121-601-002
man/off/auto
121-601-012
121-601-003
man/off/auto & high/low
121-601-015
121-601-006
FAI/recirc
121-601-013
121-601-004
FAI/recirc & high/off/low
121-601-016
121-601-007
FAI/recirc & man/off/auto
121-601-017
121-601-008
FAI/recirc, man/off/auto & high/low
121-601-018
121-601-009
Standard part number
Tamper resistant
Honeywell T6360B1028 for LPHW Coils
903-002-056
n/a
Honeywell T6360B1069 for LPHW Coils
n/a
903-002-057
903-002-071
n/a
standard black finish
Special finish (specify colour/gloss)
Room thermostats
Honeywell T4H110A1021 programable digital
thermostat for electric heating
Loose grilles and fixing frames
Fig 03
121-248-001
121-748-001
Fig 04 /06
121-248-002
121-748-002
Fig 08/10
121-248-003
121-748-003
Fig 12/15
121-248-004
121-748-004
34
ORDERING
SERIES AM FAN CONVECTOR DESCRIPTION CODES
Code
position
Component
Component description
1
product
AM
2
model
13, 15, 16, 17, 19 20, 21, 22, 23, 25, 28, 30, 31, 34, 37, 38, 41, 52, 53, 60, 88 & 92 (Std models)
3
figure number
03, 04, 06, 08, 10, 12 & 15 - heater size
4
coil connections
L - left hand, R - right hand
5
connection orientation
T - top facing pipework connections, B - bottom facing pipework connections
6
coil type
Standard LPHW applications: WA2 & WA3,
Special applications: WA1 (LST specification & MTHW applications), WA4 (Avant-Garde specification)
Electric heating appications: E15, E20, E30, E40, E50 & E60
7
air vent
N - None, M - manual, A - automatic, P - plugged
8
motor type
AC - 230V AC motor,
EC1- EC motor requiring 2-10V input, EC2- EC motor with fitted three speed potentiometer board
9
fan speeds
Single speeds: LN - low, MN - medium, HN - high,
Dual Speeds: LM - low/medium, MH - medium/high, LH - low/high
10
low temp. cut-out LTC
N - none, 1 - fixed setting, 2 - adjustable setting
11
air thermostat on/off
N - none, C - capillary fitted (LTHW only), F - room fitted, R - remote (please specify type, see page 34)
12
air thermostat high/low
(LTHW only)
N - none, C - capillary fitted, F - room fitted, R - remote (please specify type, see page 34)
13
switch location
N - none, E- external, I - internal, R - remote
14
switch type
N - none, 1 - on/off, 2 - high/off/low, 3 - man/off/auto, 4 - man/off/auto & high/low,
5 - FAI/recirc, 6 - FAI/recirc & high/off/low, 7 - FAI/recirc & man/off/auto,
8 - FAI/recirc, man/off/auto & high.low
15
relay control
NN- none, R1 - 24V BMS enable, R2 - 24V BMS enable & speed change
16
fitted isolating valves
N - none, B - ball isolation valve
17
control valves
N - none, 4 - 4-port, 2 - 2-port
18
fitted plinth
N - none , 10 - 100mm, 15 - 150mm, 20 - 200mm
19
inlet damper
N - none, M - manual, E - electric actuator, S - spring return
20
fixed duct height
N - none, 17 - 1700mm, 19 - 1900mm, 21 - 2100mm
Product description code
1
2
3
4
5
6
7
8
9
10
11 12
13 14
15
16
17
18
19
Important Notes
1) Refer to accessories section, for items applicable to the various models.
2) Advise casing finish, if other than standard.
3) Electric heating not available with dual speed or low speed; single speeds MN or HN only.
4) Fitted thermostats (options ‘C’ and ‘F’) are only available with standard airflow units (models 13,15, 17, 20, 21, & 25)
All reversed airflow or ceiling units must have remote thermostats.
5) In electric heating units option “C” capillary thermostat is not available. Where applicable the fitted room thermostat “F”
or remote thermostat “R” will default to the Honeywell programable digital thermostat.
6) Speed change switches cannot be used with single speed LTHW or electic units.
7) If connection orientation is not defined when the order is placed the default pipework connections will be left hand,
as illustrated in this catalogue.
35
20
Quality
Dunham-Bush operates a quality control system and is a company of assessed capability to BS EN ISO 9001:2008
Whatever the product, wherever its eventual destination, Dunham-Bush design and manufacturing policy has always been firmly based on
technical quality.
Other Dunham-Bush products
Series AM cased fan convectors
Series BM concealed fan convectors
Series CM cased fan convectors
Series 600 “Ceiling tile” heaters
Evolution radiant panels
Evo-Lite radiant panels
Dunham Strip radiant panels
Sentry cased or concealed air curtains
Sentinel cased air curtains
Panther 280mm deep fan coil units
Lynx 280 & 400mm deep fan coil units
Leopard 230mm deep fan coil units
Cougar 180mm deep fan coil units
Puma vertical fan coil units
Ocelot vertical cased fan coil units
Hydrocourse trench heating
Aerocourse fan assisted trench heating
Series UH unit heaters
System LST low surface temperature radiators
Zeus ACDS Series air cooled scroll chiller
Achelous AVX-B Series variable speed air cooled vertical screw chiller
WCFX-V Series variable speed water cooled screw chiller
PROmetheus DCLC Series-M magnetic bearing variable speed centrifugal chiller
Helios ACHX-B Series air cooled horizontal screw chiller
In addition to the popular range of chillers above, Dunham-Bush offer centrifugal water cooled chillers up to 14000kW, air cooled heat
pumps up to 2000kW, precision computer room air conditioners, water and air cooled rooftop units, packaged units and a complete
range of air handling units.
Dunham-Bush Ltd
Downley Road
Havant
Hants
PO9 2JD
Tel. 023 9247 7700
Fax. 023 9245 3601
Email: info@dunham-bush.co.uk
www.dunham-bush.co.uk
Products that perform by people who care
Made in GB
FN00659
Manufacturer reserves the right to change any product specification without notice 36
121-000-000-D January 2018
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