HWD
21
English 07/13
Size
A
mm
H
mm
B
mm
Attacchi Gas
602 - 703
890
270
50
1/2
803 - 904
1040
270
50
1/2
1003 - 1104
1240
320
50
1/2
A
H
B
AUXILIARY WATER COIL
The water coil module for winter heating is used in combina-
tion with a boiler. The module can be mounted using either
right hand or left hand connections. The coil is fitted with
special valves for venting the air or draining the water in the
coil when not in use or to prevent freezing. The water coil
module may be fitted with an ON/OFF only for the HWD.
The valve is controlled directly directly by the PTH2 room
thermostat for the HWD.
The BT3 sensor supplied as standard in the module acts as
a minimum thermostat. It must be connected according to
the diagrams.
Note:
For correct operation of the heaters, air flow should not drop below the values for minimum speed.
ELECTRIC HEATER MODULE
The electric heater module is supplied for winter heating
as an alternative to the auxiliary hot water coil.
The maximum outputs available with 230V~50 are 3.0 kW
for sizes 602-703-803-904, and 4.5 kW for sizes 1003-
1104. The outputs available with 400V-3+N~50 are 3.0 kW
for sizes 602-703-803-904 and 4.5 kW for sizes 1003-1104.
The module must be installed downstream of the basic unit
directly in the outflow of air. The stainless steel spiral
heaters are mounted on a removable frame independent
from the module. The heaters feature ON-OFF operation.
90
E
D
B1
A
H
Size
A
mm
B1
mm
D
mm
E
mm
H
mm
602 - 703
820
200
775
210
255
803 - 904
1050
200
1000
210
255
1003 - 1104
1050
200
1000
260
305
