
8 | SmithsEP.co.uk | Issue 006 - November 2022 Issue 006 - November 2022 | SmithsEP.co.uk | 9
3. Connecting ducts
Careful consideration to the external resistance is
given during the fan coil unit selection process.
The external resistance, normally expressed in
Pascal’s (Pa), is based primarily on the length
and number of bends in the exible ductwork
connected to the fan coil unit. If the length of the
duct or the number of bends is increased then this
will apply added resistance, resulting in under-
performance of both the cooling/heating duties
and unit air volumes, an increase in the speed of
the fan(s) and the sound level from the unit. The
following guidelines reduce the risk of increased
external resistance.
Mounting the ducts depends on the local
situation, and is to be carried out according to
your own judgment.
The FCU can be used with either exible ducting
systems using a Spigot adapter and steel rigid
ducting systems. If a steel ducting system is used,
ideally a 500mm section of exible ducting should
be used to join the steel ducting to the FCU. This
will allow some exibility should the FCU need
removing for maintenance work.
Please follow the below instructions in order not
to affect the unit’s performance:
• Avoid any abrupt duct transitions.
• Keep ducts as short as possible.
• Mount exible connection sleeves to the intake
opening under slight tension (this is to prevent
the connection sleeve from being sucked to a
close at high fan speeds).
• Provide for proper sealing at transitions in the
duct system.
1. Fixing
The FCU MUST be installed LEVEL.
Make sure that the structure from which the
total weight of the system to be borne by the
mounting. This includes the weight of the FCU
and any ducting used.
There are several ways to install the FCU:
• The FCU can be attached directly to the
Concrete Slab:
• Attached to wooden battens which are directly
attached to the Concrete slab;
• Suspended by threaded rods
• Suspended from a Suspension Rail
Consideration should be given to the transmission
of noise with the type of mounting used.
Suspend the unit at a minimum height of 1.8 m.
This results in proper venting of the heat
exchanger and (for units with cooling) in proper
discharge of condensate.
Position the unit such that the modules will be
easy to access both during and after installation.
Installation
2. Ease of access
Adequate access to and around the perimeter
of the equipment must be given highest priority
during the installation process. This will help in
making essential maintenance as easy as possible.
Do not obstruct the clearance around the fan coil
units with ceiling lights, electrical trunking, pipes,
conduits or ductwork. To ensure the effective
maintenance of serviceable components, avoid
installing the equipment above items (xed or
unxed) that clearly compromise good access to
the units.
4. Installation of ducts
1. Where practically possible, ensure that the
ducts are kept in a straight line and the number
of tight bends is reduced to a minimum.
See Figure 2.
Fig. 1
Fig. 2
Performance data verication
Heating and cooling performance has been tested and independently veried by BSRIA to BS EN 1397: 2015.
Full set up and details available on request.
Acoustic data has been measured and independently veried by SRL Technical Services to BS EN 16583:2015.
Please ask us for our acoustic information pack for more details, including laboratory measured sound power data.
X
Y
202
95
460
Z
W
14
143
77
315
235
44˚500
256 18
175
Model/size W X Y Z Wt(kg)
500 10 970 510 512 583 30
500 20 1270 810 812 883 36
500 25 1270 810 812 883 40
500 30 1570 1110 1112 1183 47
500 40 1870 1410 1412 1483 58
500 50 2170 1710 1712 1783 66
500 55 2170 1710 1712 1783 77
500 60 2470 2010 2012 2083 80
Airflow
direction
drip
tray
electrical
cabinet
coil
Product dimensions and performance data
SVFC 500
Summer Condition: 23°C EAT, 50% RH (5.5/11°C, 6/12°C) | Winter Condition: 21°C EAT (82/71°C, 60/50°C)
Performance data
Nominal
fan speed ESP Airow SFP Total
cooling
Sensible
cooling
Total
cooling
Sensible
cooling
LPHW
heating
LPHW
heating
SIZE NR (%) Pa I/s W/I/s) 5.5/11°C 5.5/11°C 6/12°C 6/12°C 82/71°C 60/50°C
10 35 56 30 119 0.12 1.56 1.33 1.40 1.22 1.45 0.76
20 35 49 30 120 0.16 1.97 1.59 1.77 1.48 5.30 3.73
25 35 43 30 121 0.20 2.00 1.61 1.80 1.50 2.78 1.62
30 35 36 30 116 0.24 1.53 1.30 1.42 1.23 3.06 1.81
40 35 34 30 118 0.28 1.68 1.40 1.56 1.33 3.46 2.07
50 35 34 30 161 0.27 2.25 1.89 2.08 1.78 5.63 3.37
55 35 34 30 184 0.24 2.96 2.40 2.41 2.05 6.00 3.58
60 35 38 30 228 0.24 4.01 3.16 3.52 2.89 6.41 3.82