Biddle CA2 Manual page 19

M
ANUAL
B
CA S/M
Version: 6.1 (05-12-2011)
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.
B
2.5.2 Frost protection
The electronic control features integrated frost protection. It
works in two stages:
CA L/XL
1. If the discharge air temperature falls to below 5 ºC:
-
-
-
2. If the discharge air temperature falls to below 2 ºC:
-
-
The frost protection is automatically lifted when the incoming
or outgoing air temperature rises to above 8 ºC.
c
Caution:
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:
-
-
-
2.5.3 Connect the unit
1. Connect the unit to the central heating system.
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
1/2
on the operating panel is set to
fault message E6 will become final;
the fans will be switched off, but the valve of the water
control will stay open.
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).
I
NSTALLATION
61a/b. Function of output
Frost protection
).
19