10 - CODIFICATION
Character
Example
Unit type
Unit size
Air flow range (fan motor assembly size)
Chassis and insulation type
Type of control
Type: water coil and drain pan
Type of fresh air controller
No. of return air spigots
No. of supply air spigots
Fan motor speed wiring
Modification index
Specials
Character Codification Description
1,2,3,4 42EM Unit type
5 Unit size
1 42EM Size 1
2 42EM Size 2
3 42EM Size 3
6 Air flow range
0 560 m
3
/h (156 l/s) for size 1
660 m
3
/h (183 l/s) for sizes 2 and 3
1 655 m
3
/h (182 l/s) for sizes 2 and 3
2 980 m
3
/h (272 l/s) for sizes 2 and 3
3 1170 m
3
/h (325 l/s) for sizes 2 and 3
7 Chassis and insulation type
A Modular model with standard
insulation.
B Modular model with insulation
class 0 in accordance with BS 476,
part 6 and 7 and metal spigots.
C Compact model with standard
insulation.
D Compact model with insulation
class 0 in accordance with BS 476,
part 6 and 7 and metal spigots.
Character Codification Description
8,9 Control
Without terminal strip and cover
GA Unit without control valves for 2-
pipe or 4-pipe configuration with
fan cable ready for connection (unit
supplied without terminal strip and
without protective cover).
GB Unit without control valves 2-pipe
2-wire configuration with fan and
electric heater cables ready for
connection (unit supplied without
terminal strip and without
protective cover).
Terminal strip and plastic cover
GC Unit without control valves for 2-
pipe or 4-pipe configuration with
fan cables wired to a terminal block
and protected by a cover.
GD Unit without control valves for 2-
pipe 2-wire configuration with fan
and heater cables wired to a
terminal block and protected by a
cover.
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