Series EC Fan VAV Terminal Boxes

5/2.1/B/4
Series EC Fan VAV
Terminal Boxes
Type SFTB
Low Carbon Fan VAV box
Trox (U.K.) Ltd
Caxton Way
Thetford Norfolk
IP24 3SQ
Telephone +44 (0) 1842 754545
www.troxuk.co.uk
e-mail trox@troxuk.co.uk
Contents · Description
Description________________________________
Constructions · Dimensions · Materials __________
Aerodynamic Data __________________________
Technical Data · Accessories ________________________
Nomenclature ______________________________
2
3
6
8
9
Quick Selection ____________________________ 10
Secondary Attenuator _____________________________ 11
Water Coil Output Data_______________________ 12
Electric Heater Data ________________________ 13
Order Details ______________________________ 14
1
1 Velocity Flowgrid Primary Air
2 Fan Motor
3 Controls Package
3
4 Air Induction Ports
5 Access Panel
5
4
2
Trox Series Fan VAV Terminal Boxes take primary and
induction air, mix the two thoroughly and provide a constant
air supply to the occupied zone of the building.
Total flow from the diffuser is kept substantially constant thus
giving very good air distribution even with high turn down of
the primary air volume. The primary air damper can be fully
shut.
Trox Series Fan VAV Terminal Boxes have been designed
and developed to achieve lower room noise levels. Discharge
and case radiated sound pressure levels of NR 35 can be
achieved in the occupied zone.
Pressure independent control of the primary VAV damper is
accomplished by use of a Multi-point flowgrid which gives
accurate control of air flow even with a 90° bend on the inlet
spigot.
2
Mixing between the primary airstream and the induced
warm air from the ceiling void is by forward curved blade
centrifugal fan with a direct drive motor. This direct drive
motor is of the electronically commutated type fitted with
permanently lubricated bearings.
Trox Series Fan VAV Terminal Boxes are eminently
suitable for low temperature air applications. If the supply air
temperature is low, then the fan volume flow rate must be
higher than the 100% primary air volume flow rate to ensure
suitable air temperature at the diffuser.
Design of the SFTB ensures that at 100% primary air,
sufficient induced air is mixed with the primary air so that
the air discharged has a conventional cooling differential
which will not cause draught problems in the space being
conditioned.
Construction · Dimensions · Materials
Trox Series Fan VAV Boxes save energy by utilising the
warm air in the building already generated by other sources
and mixing it with primary air before distributing a constant
volume air supply direct to the occupied zone. This reduces
energy consumption, so providing long term operational
savings. Available in a range of sizes from 100 l/s to 790 l/s.
Trox Series Fan VAV boxes are suitable for electronic
control. Volume flow tolerance is dependent on the type of
control system but is typically ±5% to ±10% of set volume.
The units are designed for use in VAV systems and in
conjunction with DDC controllers permit communications
between the boxes and a centralised control area.
enclosure has a single electrical (230 V) mains entry position.
Casing
The casing is sturdily constructed of galvanised sheet steel.
The overall construction is reinforced to meet acoustic
performance requirements.
- Casing with acoustic and thermal insulation, erosion
resistant up to 20 m/s.
- High pressure side with duct spigot suitable for circular
ducting.
- Low pressure side suitable for angle frames or slide-on
flanges.
General
Series Fan VAV terminal VAV boxes are constructed from
galvanised steel meeting all relevant UK construction
standards. All electrical control components are protected
by sheet metal enclosures to meet UK practices. The
UNITS MANUFACTURE WITH
22mm DEEP RECESSED ENDS
ALLOWING 100mm TOTAL
SPIGOT CONNECTION LENGTH
”
”
RIGHT HAND CONTROLS LOCATION
‘CL’ CONTROLS ENCLOSURE LENGTH
’’
AIRFLOW DIRECTION
UNIT CONTROLS CONTAINED WITHIN STEEL ENCLOSURE WITH
REMOVABLE LID RETAINED VIA 4-OFF 1/4 TURN FASTENERS, REFER TO
SEPERATE DRAWING FOR SPECIFIC CONTROLS LAYOUT DETAILS
’’
‘BH’ O/A
BODY HEIGHT
‘FW’
HOLE CRS
19
’’
195
DUCT
12 DIAMETER
HOLES IN
FLANCE
(4-OFF)
‘FH’
HOLE CRS
’’
35
‘BL’ OVERALL BODY LENGTH
77
‘CH’ CONTROLS
ENCLOSURE
HEIGHT
’’
‘S’ SUPPORT
HOLE
CENTRES
INTERNALLY
MOUNTED FAN AS
SPECIFIED ON
ORDER SCHEDULE
SIZED TO SUIT
PERFORMANCE
REQUIREMENTS
TWIN INDUCTION
AIR PORTS IN
FRONT FACE
’’
11
LEFT HAND
CONTROLS LOCATION
‘D’
OUTSIDE
DIAMETER
‘BW’ OVERALL BODY WIDTH
11
150 CONTROL ENCL.
VELOCITY FLOW GRID
FITTED IN PRIMARY AIR
SPIGOT, TUBING TO
CONTROLS IS RETAINED
WITHIN THE MAIN BODY
- Drilled mounting holes for support rods are provided in the
top flange of the casing.
10 DIAMETER
UNIT SUPPORT HOLES
(4-OFF)
Type SFTB
NOTE:
SFTB UNIT FITTED WITH RIGHT HAND
MOUNTED CONTROLS SHOWN, WHEN
LEFT HAND MOUNTED CONTROLS ARE
REQUIRED ENCLOSURES WILL BE
POSITIONED AS INDICATED:CALL FOR ‘R’ OR ‘L’ IN PRODUCT CODE.
- Casing leakage rate to DW 144 Class A.
RECOMMENDED CONNECTION
DUCT
SIZE = ‘FW’ - 30mm x ‘FH’ - 30mm
RELEASE FIXINGS
AND SLIDE TO
REMOVE PANEL
‘FAP’ OVERALL
REMOVABLE FAN
ACCESS PANEL LENGTH
x FULL BODY WIDTH
Unit
mm
110
210
310
410
Spigot
mm
125, 160
160, 200, 250
160, 200, 250, 315
250, 315
D
mm
1mm smaller
than spigot size
BL
mm
BW
mm
BH
mm
FW
mm
FH
mm
FAP
mm
1015
582
433
284
236
510
1415
802
503
484
339
625
1215
1665
712
992
463
543
384
634
288
390
565
660
CL
mm
CK
mm
850
390
260
50
1250
460
400
120
1050
1500
420
500
S
mm
340
500
Weight
kg
70
150
3
Construction · Dimensions · Materials
Access Door
VAV Section – Volume Flow
To avoid removal of the terminal box once fitted in the
system, an access door is provided in the casing underside
so that the fan/motor can be serviced, or in the unlikely event
of failure, removed without disturbing the duct connections.
The Series Fan VAV Terminal Box is suitable for pressure
independent control. Volume flow is sensed by a multi-point,
averaging flowgrid measuring pressure differential.
- Primary volume flow tolerance is dependent on type of
control system but is typically ±5% to ±10% of set
volume.
Insulation
- The inside of the terminal box is acoustically lined with a
minimum of 50mm thickness PU foam.
- Primary volume flow control range typically 100% to 10%
depending on type of control.
- All lining materials have Class ‘O’ fire rating conforming to
UK building regulations.
- Primary air volume flow range adjustment at factory.
- Electronic controllers can be fitted.
- The access door is also lined with the same material.
- Volume measurement can be made on site using the
flowgrid; also adjustment of volume flow through
controller.
- Control and full shut off is achieved with a single damper.
Type SFTB
with Hot Water Coil
UNITS MANUFACTURE WITH
11
”
”
RIGHT HAND CONTROLS LOCATION
‘CL’ CONTROLS ENCLOSURE LENGTH
TWIN INDUCTION
AIR PORTS IN
FRONT FACE
’’
‘S’ SUPPORT
HOLE
CENTRES
INTERNALLY
MOUNTED FAN AS
SPECIFIED ON
ORDER SCHEDULE
SIZED TO SUIT
PERFORMANCE
REQUIREMENTS
150 CONTROL ENCL.
VELOCITY FLOW GRID
FITTED IN PRIMARY AIR
SPIGOT, TUBING TO
CONTROLS IS RETAINED
WITHIN THE MAIN BODY
11
LEFT HAND
CONTROLS LOCATION
‘D’
OUTSIDE
DIAMETER
NOTE:
SFTB UNIT FITTED WITH RIGHT HAND
MOUNTED CONTROLS SHOWN, WHEN
LEFT HAND MOUNTED CONTROLS ARE
REQUIRED ENCLOSURES WILL BE
POSITIONED AS INDICATED:CALL FOR ‘R’ OR ‘L’ IN PRODUCT CODE.
‘BW’ OVERALL BODY WIDTH
22mm DEEP RECESSED ENDS
ALLOWING 100mm TOTAL
SPIGOT CONNECTION LENGTH
10 DIAMETER
UNIT SUPPORT HOLES
(4-OFF)
35
‘FW’
HOLE CRS
265
‘BL’ OVERALL BODY LENGTH
77
COIL WITH 1/2” C CONNECTIONS
MOUNTED SAME SIDE AS ELECTRICAL
CONTROLS UNLESS OTHERWISE
STATED ON ORDER PAPERWORK
10 DIAMETER
HOLES IN
COIL FLANCE
(4-OFF)
’’
’’
AIRFLOW DIRECTION
UNIT CONTROLS CONTAINED WITHIN STEEL ENCLOSURE WITH
REMOVABLE LID RETAINED VIA 4-OFF 1/4 TURN FASTENERS, REFER TO
SEPERATE DRAWING FOR SPECIFIC CONTROLS LAYOUT DETAILS
’’
‘BH’ O/A
BODY HEIGHT
’’
19
’’
‘FH’
HOLE CRS
‘CH’ CONTROLS
ENCLOSURE
HEIGHT
70
RECOMMENDED CONNECTION
DUCT
SIZE = ‘FW’ - 30mm x ‘FH’ - 30mm
FAN ACCESS PANEL SECURED WITH 6-OFF M8
MACHINE SCREW FIXINGS, RELEASE SCREWS AND
SLIDE ALONG KEYHOLE SLOTS APPROX 30mm
TOWARDS DISCHARGE END TO REMOVE PANEL
30 DUCT
FLANCE WIDTH
RELEASE FIXINGS
AND SLIDE TO
REMOVE PANEL
‘FAP’ OVERALL
REMOVABLE FAN
ACCESS PANEL LENGTH
x FULL BODY WIDTH
Unit
mm
110
210
310
410
4
Spigot
mm
125, 160
160, 200, 250
160, 200, 250, 315
250, 315
D
mm
1mm smaller
than spigot size
BL
mm
BW
mm
BH
mm
FW
mm
FH
mm
FAP
mm
1015
582
433
284
236
510
1415
802
503
484
339
625
1215
1665
712
992
463
543
384
634
288
390
565
660
CL
mm
CK
mm
850
390
260
55
1250
460
400
130
1050
1500
420
500
S
mm
340
500
Weight
kg
75
160
Construction · Dimensions · Materials
Pressure Differential Flowgrid
- The closed damper has a shut off leakage at 500Pa inlet
pressure of less than 0.5% of rated flow.
- Minimum pressure differential signal from 2Pa upwards.
- The damper blade is positively connected to its drive shaft
which runs in maintenance free plastic (Pocan) long life
bearings.
- Sensor tubes in aluminium.
- Test pressure tappings are supplied with tight fitting caps.
- Calibration graphs and constants are provided to relate
volume flow in litres/second to the measured pressure
differentials.
- Evoprene damper seal, thermoplastic elastomer
compound seal suitable for temperatures up to 50°C.
Total Airflow Monitoring
- The differential pressure generated by the averaging
sensor is within ±3% of the calibration chart value over the
range of typical primary air flow rates.
An optional total flow measuring grid can be fitted in the
airway of the secondary silencer to provide a signal for flow
monitoring.
Control Damper
The single blade damper is mounted in the circular duct
behind the flow measuring grid. The drive spindle is
extended through the casing and a suitable actuator slips
over the shaft and locks directly to it.
10 DIAMETER
UNIT SUPPORT HOLES
(4-OFF)
Type SFTB with Electric Heater
UNITS MANUFACTURE WITH
22mm DEEP RECESSED ENDS
ALLOWING 100mm TOTAL
SPIGOT CONNECTION LENGTH
”
”
RIGHT HAND CONTROLS LOCATION
‘CL’ CONTROLS ENCLOSURE LENGTH
’’
‘FW’
HOLE CRS
AIRFLOW DIRECTION
UNIT CONTROLS CONTAINED WITHIN STEEL ENCLOSURE WITH
REMOVABLE LID RETAINED VIA 4-OFF 1/4 TURN FASTENERS, REFER TO
SEPERATE DRAWING FOR SPECIFIC CONTROLS LAYOUT DETAILS
’’
19
’’
12 DIAMETER
HOLES IN
FLANCE
(4-OFF)
‘FH’
HOLE CRS
’’
365 ELECTRIC
HEATER DUCT
LENGTH
‘BL’ OVERALL BODY LENGTH
77
‘CH’ CONTROLS
ENCLOSURE
HEIGHT
’’
35
ELECTRIC HEATER
ELEMENT ENCLOSURE
LID RETAINED VIA 4-OFF
1/4 TURN FASTENERS
‘BH’ O/A
BODY HEIGHT
TWIN INDUCTION
AIR PORTS IN
FRONT FACE
’’
‘S’ SUPPORT
HOLE
CENTRES
INTERNALLY
MOUNTED FAN AS
SPECIFIED ON
ORDER SCHEDULE
SIZED TO SUIT
PERFORMANCE
REQUIREMENTS
150 CONTROL ENCL.
VELOCITY FLOW GRID
FITTED IN PRIMARY AIR
SPIGOT, TUBING TO
CONTROLS IS RETAINED
WITHIN THE MAIN BODY
11
LEFT HAND
CONTROLS LOCATION
‘D’
OUTSIDE
DIAMETER
‘BW’ OVERALL BODY WIDTH
NOTE:
SFTB UNIT FITTED WITH RIGHT HAND
MOUNTED CONTROLS SHOWN, WHEN
LEFT HAND MOUNTED CONTROLS ARE
REQUIRED ENCLOSURES WILL BE
POSITIONED AS INDICATED:CALL FOR ‘R’ OR ‘L’ IN PRODUCT CODE.
11
RECOMMENDED CONNECTION
DUCT
SIZE = ‘FW’ - 30mm x ‘FH’ - 30mm
ELECTRIC HEATER ELEM
FITTED AS SPECIFIED ON
ORDER SCHEDULE SIZE
MEET PERFORMANCE
REQUIREMENTS
125
FAN ACCESS PANEL SECURED WITH 6-OFF
M8 MACHINE SCREW FIXINGS, RELEASE
SCREWS AND SLIDE ALONG KEYHOLE
SLOTS APPROX 30mm TOWARDS
DISCHARGE END TO REMOVE PANEL
RELEASE FIXINGS
AND SLIDE TO
REMOVE PANEL
30 FLANCE
(4 SIDES)
‘FAP’ OVERALL
REMOVABLE FAN
ACCESS PANEL LENGTH
x FULL BODY WIDTH
Unit
mm
110
210
310
410
Spigot
mm
125, 160
160, 200, 250
160, 200, 250, 315
250, 315
D
mm
1mm smaller
than spigot size
BL
mm
BW
mm
BH
mm
FW
mm
FH
mm
FAP
mm
1015
582
433
284
236
510
1415
802
503
484
339
625
1215
1665
712
992
463
543
384
634
288
390
565
660
CL
mm
CK
mm
850
390
260
55
1250
460
400
130
1050
1500
420
500
S
mm
340
500
Weight
kg
75
160
5
Aerodynamic Data
Primary Air Volume Range · Fan Volumes
Performance Details
- Discharge flow remains constant within ±7.5% from 100%
primary to minimum primary air.
Primary Air Volume Range
- Minimum primary air pressure differential required typically
25Pa. For actual values see page 7.
Notes
The minimum primary air volume shown is the minimum
factory set value for control purposes. See page 7 for leakage
on full shut off.
Fan volume is given for typical downstream pressures. Other
downstream pressures duties available on request.
Spigot
Code
Spigot
Size
Minimum*
Primary
Airflow (l/s)
Maximum
Primary
Airflow (l/s)
125
124
15
125
160
159
25
200
200
199
40
310
250
249
60
490
315
314
105
780
Table 1: Fan Volume SFTB-E with TSFB
SFTB Size
110
210
310
410
Fan Code
EC8
EC1
EC1
EC2
EC2
EC3
EC3
Fan Speed
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Total Fan Volume
SFTB with TSF (with or without Electric Heater)
ESP1) 50Pa (l/s)
100
100
140
145
141
141
165
175
166
166
290
300
201
201
335
360
271
271
390
420
391
391
610
640
611
611
773
783
1) ESP = External Static Pressure
Table 2: Fan Volume SFTB-1 with TSFB
SFTB Size
110
210
310
410
Fan Code
EC8
EC1
EC1
EC2
EC2
EC3
EC3
Fan Speed
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
ESP1) 30Pa (l/s)
100
150
141
180
166
310
201
380
271
440
391
660
611
790
Total Fan Volume
SFTB-1 with TSF (with 1 row LPHW coil)
ESP1) 50Pa (l/s)
100
120
121
150
151
260
201
335
271
390
391
600
601
713
Selection Method
- First select case size and fan code on basis of fan
volume flow rate.
- Select inlet spigot size to meet maximum and minimum
primary air requirements.
6
ESP1) 40Pa (l/s)
ESP1) 40Pa (l/s)
100
130
121
160
151
275
201
340
271
395
391
605
601
720
Example
ESP1) 30Pa (l/s)
100
140
121
165
151
290
201
345
271
400
391
610
601
716
Given Fan flow 180 l/s (without water heater) ESP 50 Pa
Maximum Primary Air 120 l/s
Minimum Primary Air 35 l/s
Selection
Spigot Code
Case size
Fan Code
160
210
EC1
Aerodynamic Data
Minimum Inlet Static Pressure · Closed Primary Air Damper Leakage
Table 3: Minimum Inlet Static Pressure
Primary Inlet
Spigot Code
.
V1 (l/s)
pSI min Pa
125
15
110
20
50
160
25
180
20
40
200
40
290
20
35
250
60
440
20
25
315
105
700
20
20
Table 4: Leakage Across Closed Primary Air Damper
Primary
Inlet
Spigot
Code
.
VL l/s
pSI Pa
250 Pa
500 Pa
125
0.14
0.20
160
0.20
0.28
200
0.31
0.44
250
0.50
0.69
315
0.78
1.10
7
Technical Data · Accessories
Fan and Motor
EC Fan VAV boxes are supplied as a constant volume fan with
a manually adjustable potentiometer fitted to adjust the fan
speed to the design air volume during commissioning. The
primary air supply should never exceed 90% of the total fan
volume to prevent primary air blowing out of the air intakes into
the ceiling void.
The Series Fan VAV terminal boxes are fitted with fan
casings (Scrolls) manufactured from sheet steel.
The fans have a forward curved fan impeller.
All fan motors are soft start and direct drive resiliently
mounted via location brackets suitable for 230 volts 50 Hz
single phase and are supplied with auto reset thermal
overloads. The fan motors are electronically commutated
types fitted with permanently lubricated bearings.
All earthing wiring and component selection conforms to
BS/IET wiring requirements.
EC Fans are capable of variable speed control when
connected to a BMS controller enabling a turn down when
peak cooling is not required. Care needs to be taken to ensure
the supply air diffuser remain within an acceptable operating
window to prevent dumping and comfort issues.
Fan Motor Speed Control
All fan motors fitted to Trox Series Fan VAV Terminal Boxes
are suitable for fan speed control using a 0 - 10V control
signal.
Accessories
Provision is made on the induction ports of the unit for the
installation of air filters. These can be metal cleanable filters,
or glass fibre throwaway filters in cardboard frame.
Constant Volume Operation
Table 5: Fan Motor Details
Case Code
110
210
310
410
8
Fan Code
W2 Watts
EC8
86
92
0.7
-
EC1
200
187
1.3
EC1
200
253
EC2
200
EC2
Ar Amps
As Amps
PF
SFP W/l/s
0.57
0.5
37A ~2ms
0.5
0.6
1.7
37A ~2ms
0.48
0.67
245
1.6
37A ~2ms
0.55
0.7
200
218
1.5
37A ~2ms
0.45
0.47
EC3
500
459
2.0
65A ~1ms
0.65
0.65
EC3
500
305
1.4
65A ~1ms
0.6
0.35
W1 Watts
Nomenclature
Nomenclature
LWNR
: NR rating of octave sound power
levels for ductborne regenerated
noise.
NR1
: NR rating of octave sound power
levels of ductborne regenerated noise
including insertion loss of TSFB
secondary silencer and 8 dB room
attenuation.
NR2
NR3
: NR rating of octave sound power
levels for case radiation and induction
port noise including a combined 14 dB
ceiling reduction and room attenuation,
for the case of zero primary air (fan
only)
: NR rating of octave sound power
levels for case radiation and induction
port noise including a combined 14 dB
ceiling reduction and room attenuation,
for the case of 100%primary air and
200 Pa primary air pressure.
pSD
in Pa: Downstream static pressure.
pSI
in Pa: Inlet static pressure.
pSI min
VI in l/s
in Pa: Minimum inlet static pressure. .
: Primary air volume flow rate .
VD in l/s
.
VL in l/s
: Discharge (fan)volume flow rate
: Leakage volume flow rate across
closed primary air damper.
W1
in Watts: Input power to motor at maximum fan
volume flow rate.
W2
in Watts: Output power of motor.
AS
in amps: Motor invertor inrush current at power on
AR
.
MW
.
Q
∆pW
in amps: Motor running current
in kg/s: Mass flow water
in kW: Heat output.
in kPa: Water pressure drop.
9
Quick Selection
Table 6: Quick selection SFTB-E with TSFB
Case Code
110
210
310
410
Fan Code
EC8
EC1
EC1
EC2
EC2
EC3
EC3
.
VD
l/s
100
140
141
165
166
250
251
335
336
390
391
610
611
773
pSD Pa
Pa
50
50
50
50
50
50
50
50
50
50
50
50
50
50
LWNR
NR1
NR2
NR3
53
56
53
55
55
59
53
58
59
61
56
65
65
73
30
33
30
32
31
35
28
33
33
34
27
34
31
36
17
20
16
19
19
28
28
29
19
24
18
29
29
36
24
26
23
24
22
30
25
29
25
27
24
32
34
39
Refer to table on page 6 for relationship of inlet spigot diameter and primary air flow rate.
Sound Power Level spectrum available on request.
10
Secondary Attenuator
TSFB
Insulation
- The inside of the TSFB Attenuator is acoustically lined with
a minimum 50mm thickness.
- Face of the mineral wool has a glass fibre tissue covering
securely fixed to the substrate. PU Foam side liners are
incorporated.
- All lining materials have Class ‘O’ fire rating conforming to
UK building regulations.
- A perforated plate liner is available on request.
Secondary Attenuator Type TSFB
‘B’ + 20 SUPPORT HOLE CRS
‘L’ (MINIMUM 750mm, MAXIMUM 1500mm
20 WIDE
TOP FLANGE
=
501)
501)
‘X’
=
‘M’ FIXING CRS
=
‘L’-28 BETWEEN JOINT FACES
‘B’ UNIT WIDTH
12 DIA HOLES
4-OFF CORNERS ON SIZES
110, 111, 210, AND 211 6-OFF
ON ALL OTHER SIZES
‘N’ + 26
‘N’ FIXING CRS
‘M’ FIXING CRS
‘M’ - 34 I/S DUCT
‘M’ + 26
150
AIRFLOW DIRECTION
FOR ‘-VG*’ UNITS
VELOCITY GRID
CONNECTIONS
TO SUIT 6mm
I/D TUBING
=
10mm DIAMETER HOLES FOR
DROP ROD SUPPORTS (4-OFF)
150
M8 THREADED INSERTS
4-OFF CORNERS ON SIZES
110, 111, 210, AND 211 6-OFF
ON ALL OTHER SIZES
‘M’ FIXING CRS
‘H’ UNIT HEIGHT
=
1)ADDITIONAL
DUCT
DETAILS (OPTION -D1)
SUPPLIED FITTED
TO BOTH ENDS OF UNIT
65
VELOCITY GRID FITTED CENTRALLY
ON LENGTH WHEN OPTION VGR OR -VGL IS SPECIFIED
IN ORDER CODE. ‘R’ AND ‘L’
REFERS TO HANDING
ON GRID CONNECTIONS,
RIGHT HAND OPTION SHOWN
ABOVE, LEFT HAND OPTION
HAS GRID CONNECTIONS ON
OPPOSITE SIDE
‘L’ UNIT
LENGTH
CONNECTING
DUCT
WASHER
M8 SCREW
‘TSFB’ UNIT
NOTE:
ADDITIONAL DUCT
MANUFACTURED FROM
1.5mm THICK
GALVANISED MILD
STEEL SHEET
14 DEEP
RECESSED
END
GASKET OR
SEAL
=
ENLARGED TYPICAL
END CONNECTION DETAILS
‘N’ - 34 I/S DUCT
Table 7:
Case Size
L
B
H
N
M
X
110
750
354
392
284
239
170
210
1000
454
402
384
288
175
310
1200
554
402
484
339
175
410
1500
704
452
634
390
188
11
Water Coil Output Data
Hot Water Coils
The hot water heating coil is manufactured from 3/8 inch
diameter copper tube with aluminium fins spaced at
1.8mm. The tubes are formed into circuits to limit water
velocity and mounted in a galvanised sheet steel flanged
frame with copper headers. The heating coils meet the
requirements of British Standards/Codes as applicable.
Coil connections are 1/2 inch BSP as standard.
Plugged air vent and drain points are provided.
Water control valves can be supplied as a loose item if
required.
The maximum coil output is shown in kW for water
temperatures of 82°C flow and 71°C return and based
on air temperature entering the coil of 22°C. The water
pressure drop is shown in kPa and the water rate in kg/s.
Other water/air temperatures available on request.
Table 8: One Row Coil.
Coil
Size
110
210
310
410
12
.
VD
l/s
100
125
165
220
250
305
305
360
450
520
580
650
780
.
Q
kW
2.2
2.6
3.8
4.4
4.6
5.3
6.5
7.1
7.9
8.7
9.3
12.1
13.5
.
WM
kg/s
.052
.062
.090
.105
.110
.126
.155
.170
.188
.207
.220
.288
.320
∆pW
kPa
3
5
2
3
3
4
2
3
4
5
5
5
6
Electric Heater Data
Electric Heaters 1)
The electric heater is available as an integral unit
complete
with controls including fuses and interlocks. The
integral air heater has elements designed for black heat
operation and consists of 80/20 nickel chrome wire in a
stainless steel tube (grade 312) filled with magnesium
oxide.
An automatic and manual reset high temperature cut out
are fitted and a brass earth stud included. The heater is
manufactured to British Standards/Codes as applicable
and fully factory tested. A current switch is fitted to
monitor the fan running above minimum duty. The
heater elements are wired back into the control
enclosure, including the earth, and heater fuses can be
supplied.
Control of the heater for stepless control is by solid
state relay.
Electric heaters are available on request. Full details
required such as kW should be stated.
1)
! When heating is required the primary air should be at
Vmin. It is recomended that the BMS is used to monitor
the state of the high temperature cut outs.
! Run-on Time:
The control strategy for the heater must allow a minimum
of 10 miniutes run-on time to allow the heater to cool
safely. During this time the Vmin heating cycle air volume
must be maintained for the 10 minute duration after the
heater control siganl is switched off.
Table 9: Electric Heaters
.
Q kW
Size
Supply Voltage
230V / 1ph 50Hz
400V / 3ph 50Hz
110
1, 2, 3
–
210
1, 2, 3, 4
3, 4.5, 6
310
2, 3, 4, 5
3, 4.5, 6, 7.5
410
3, 4, 5
3, 4.5, 6, 7.5, 9
13
Order Details
Specification Text
Materials
Series Fan VAV boxes type SFTB for constant room air
supply volume combined with VAV primary air control having
high turndown by use of a multi-point flowgrid. Induction of
warm air from the ceiling void by forward curved blade
centrifugal fan with direct drive motor.
Single blade control damper with seal for shut off. Stepless
speed controller to enable fan duty to be set to match the
downstream duct system pressure.
Left Hand Connection
primary air
Casing manufactured from galvanised sheet steel.
Internally lined with PU Foam.
Multi-point flowgrid construced from aluminium tubes.
Fan casing manufactured from sheet steel. Fan impeller
from aluminium alloy or steel according to size.
Right Hand Connection
primary air
Order Example
Recirculated air
Make : TROX
Type : SFTB-R/110x125xEC1/0/
BC0/120-100-50
Recirculated air
Order Code - Fan Assisted Terminal Box
SFTB - R - 1 - C - S /
110 x 125 x EC1
Product Type
Handing
L = Left Hand
R = Right Hand
Reheat
1 = with 1 row LPHW coil
E* = with electric reheat coil
or no entry
Case
Size
Fan
Code
110
210
310
410
EC1
EC2
EC3
EC8
Design changes reserved · All rights reserved © Trox (U.K.) Limited (12/2004)
Induction flowgrid
S = induction port with flow
pressure differential sensor
or no entry
/
BC0
/ 120 - 100 - 50
Maximum
primary air
volume l/s
Fan volume l/s
Controller
Refer to Trox
*Electric Heater available on request
Order Code - Secondary Silencer for SFTB Box
/
210
Product Type
Lining
LB = Perforated plate lining
or no entry
Flowgrid
VGL = Left Hand
VGR = Right Hand
or no entry
Duct Piece
D1 = Additional ducts fitted
or no entry
14
/
0
Not used
Size
110
210
310
410
00B479
Control
Diagram
Refer to Trox
Always 0
125
160
200
250
315
TSFB - LB - VGR - D1
/
Minimum
primary air
volume l/s
Spigot
Size
Filter
M = Metal
C = Throwaway
or no entry
0
/
No entry for standard length
or special length in mm on
request