
U
SER
’
S
AND
I
NSTALLER
’
S
M
ANUAL
S
ERVICE
Version: 4.0 (23-08-2007)
57
7.6
Venting heat exchanger
For water-heated models only
The air relief valve
1
is located in the upper left of the unit.
The valve can be opened using the supplied key.
7.7
Entering unit code into printed circuit board
Introduction
The unit code must be entered after replacing the printed cir-
cuit board in the unit.
The unit code depends on the unit type and is indicated on the
type plate (see section
1.3.4
.)
Entering unit code
ê
1. Connect the power supply (insert plug into power point or
move isolation switch to On).
Warning:
w
Do NOT touch any live parts.
2. Press down the microswitch on the printed circuit board
(at
1
).
The LED next to the microswitch will start blinking.
Note:
n
The figure shows models CA S and CA M. With models
CA L and CA XL, the printed circuit board is turned a
quarter.
1
1