CA S/M
CA L/XL
A
B
AB
A
B
AB
M
ANUAL
I
NSTALLATION
Version: 6.1 (05-12-2011)
19
Units with side connection
On request, units with electrical
12
and water-side
3
connections on the side can be supplied. The water-side
control is then not built-in, but has to be connected outside
the unit during installation.
1. Connect the valve to the connections
3
as shown in the
diagram opposite.
2. Connect the valve drive to terminal
2
.
2.5.2 Frost protection
The electronic control features integrated frost protection. It
works in two stages:
1. If the discharge air temperature falls to below 5 ºC:
-
the control panel will temporarily display fault message
E6 (see section
5.3
);
-
the valve of the integral water control will open fully;
-
the output on the unit gives a signal for the central
heating installation (if function
61a/b. Function of output
1/2
on the operating panel is set to
Frost protection
).
2. If the discharge air temperature falls to below 2 ºC:
-
fault message E6 will become final;
-
the fans will be switched off, but the valve of the water
control will stay open.
The frost protection is automatically lifted when the incoming
or outgoing air temperature rises to above 8 ºC.
Caution:
c
The frost protection reduces the risk of freezing but does
not warrant 100% protection.
Take the following precautions if you install the unit in a
room where frost may occur:
-
Provide for constant circulation of the water at the
right temperature;
-
Add up to 20% glycol to the water when the unit is not
in operation during the wintertime;
-
Or drain the system and the unit (see section
6.8
).
2.5.3 Connect the unit
1. Connect the unit to the central heating system.
