MAXA HCA1 22 Manual Usuario página 52

VALVE
For winter operation with external air supply, we recommend installing an antifreeze thermostat calibrated at 2°C, with
the bulb on the water outlet pipe, which intercepts the supplementary fan. The external airflow must be less than 10%
of the total airflow to avoid operating problems and noise. Install a suction grille outside with a filter frame that can be
inspected, so as to prevent the suction of dust and leaves that could irreparably obstruct the unit's heat exchange coil.
The installation of the filter means that a duct closure damper does not need to be installed during longs periods out
of use.
II. 2.5 WATER CONNECTIONS
IMPORTANT!
The water connections are very important and specialist personnel should dedicate particular care to
these operations.
II. 2.5.1 Connection to the system
The water connections are fixed to the structure of the unit so as to prevent breakage during the connection of the
pipes. However, we recommend holding the connection in place with a spanner. The top coil connection has an air
bleed valve, while the bottom connection has a drainage valve, which can be adjusted using a 10 mm spanner or a
screwdriver.
IMPORTANT!
The coil can only be partly drained. For complete drainage we recommend blowing air into the coil.
IN water inlet
OUT Water outlet
V1 Air bleed valve
V1 Drainage valve
Models
HCA1 22-29-35-42 ¾"
HCA1 60 ¾"
HCA1/4 22-35-50 ¾"
HCA1/4 60
52
HCA1 22-29-35-42-60
3 2 1
Ø connections
¾"
HCA1 /4 35-50-60
1 2 3 4
VALVE - C VALVE - H
1 Unit terminal board
2 Antifreeze thermostat
3 Speed variator
4 External fan motor
5 230 V relay