Main modules and components
■■ Variable-speed LEC fan motor assembly
The 42BJ ICM LEC units are equipped with a variablespeed fan motor assembly controlled by a 0-10 V signal
from the electronic Carrier controller.
■■ Water coil
The water coil has aluminium fins mechanically bonded to
copper tubes by expansion.
Water inlet and outlet connections are threaded 1/2” gas.
Air purge valves are standard. The coil is integral with the
drain pan and the coil access door to ease removal for
service. Coils available are:
-- two-pipe coils with changeover or for use with an
electric heater.
-- four-pipe coils.
■■ Thermoformed condensate drain pan
The main pan is below the coil with an auxiliary pan below
the valves. This monobloc construction prevents leaks.
With the coil on the suction side of the fan to facilitate
drainage, condensate has to be drained through a nonreturn flap valve. The difference in height between the
main and auxiliary drain pans is enough to overcome the
depression within the unit and dispenses with the need
for an in-built siphon.
■■ Constant volume fresh air controller (option)
The ICM unit can be fitted with a constant fresh air flow
controller allowing the number of air changes to be
controlled accurately. It is vital to choose the correct
constant fresh air flow controller for the intended occupancy
of the room or zone.
The following range of controllers is available:
-- 8.3 l/s or 30 m3/h (-10%; +20%)
-- 16.6 l/s or 60 m3/h (-10%; +20%)
The fresh air supply is located upstream of the water coil.
The collar which houses the flow controller is made of ABS
and has the following diameter:
3
-- 125 mm for the controller with 16.6 l/s (60 m /h)
3
-- 74 mm for the controller with 8.3 l/s (30 m /h).
The auxiliary pan is insulated. The drain stub itself has
16 mm external diameter.
■■ Filter and access
The 42BJ ICM is fitted with a high-efficiency F5 or F6 type
filter.
Fire rating medium M1, metal frame
Three filter access options are provided on the 42BJ:
-- From above for units in false floor voids
-- From below for units in false ceiling voids
-- From the side (all applications)
AIR TREATMENT
MR60
MR75
MR85
MR90
MR100
MR105
MR110
MR120
MR130
MR140
MR160
43 2 1
12 3 4
B
A
43 2 1
12 3 4
l/s m3/h A
B
17
21
24
25
28
29
31
33
36
39
44
4-4
4-3
3-2
2-2
2-1
1-1
1-1
-
60
75
85
90
100
105
110
120
130
140
160
4-4
4-3
3-3
3-2
2-1
2-1
1-1
3-3
2-1
1-1
-
Fresh air controller
674
C
A
R
R
I
E
R
2
0
1
6
/
2
0
1
7