Water Connections - MAXA HCA22 Manual De Usuario

Connect the valve to the terminal board of the electric panel as illustrated in the wiring diagrams.
NOTE: The valve assembly seal efficiency is tested in the factory. Any leaks in the system should
therefore be attributed to incorrect installation.
II. 2.5.7 Operation of the motorized electro thermal valve
This three-way valve is an OPEN/CLOSED type with very slow excursion. It is not a modulation valve, because it
does not have PTC. This valve is controlled, as a sensitive element, by the unit's ambient thermostat.
The electro thermal valve is normally closed towards the coil and open towards the bypass. When the ambient
temperature does not satisfy the thermostat, an electric heater heats a thermostatic element that causes the shaft to
descend. The valve opens in around three minutes, allowing water to circulate in the coil. When the ambient
temperature satisfies the thermostat or when the main supply has been disconnected, the valve closes in around
three minutes towards the coil and opens towards the bypass.
In the event of an emergency, the valve can be opened manually by removing the electric actuator and unscrewing
the ring nut. When the emergency is over, remember to restore automatic valve operation, replacing the electric
actuator. Failure to do so may cause condensation to form in the water passage, even when disconnected from the
power supply.
II. 2.5.8 Instructions to be followed when using valves supplied by the installer

Water connections

Install the valves following the manufacturer's instructions. Insulate the pipes, the valve assemblies and the coil
connections (chilled water side) carefully in order to prevent condensation from forming on them and dripping onto the
false ceiling. Electrical connections connect the ambient control by following the instructions relative to the control
used.
Electrical connections
Connect the ambient control by following the instructions relative to the control used.
ATTENTION!
Run the cables through the unit cable gland.
Connect the valves by following the instructions below, using the wiring diagrams provided. You must use valves that
close the unit water inlet when there is no power. 230V two position (ON-OFF) valves In this case, the cold/hot water
valve must be piloted by the on/off signal at 230V coming from terminal 1 and 2 of the terminal board. Other voltage
two position (ON-OFF) valves. Install a 230V relay on terminals 1 and 2, which will control the valve opening.
HCA 22-29-35-42-60-80
COLD/ HOT
3 2 1
II. 2.5.9 Antifreeze protection
IMPORTANT!
- When the unit is out of service, drain all the water contents from the circuit as soon as possible.
- Mixing the water with glycol modifies the performance of the unit. Read the glycol safety precautions provided on the
packaging.
Failure to use the unit during the winter period may cause the water contained in the system to freeze. The water
circuit needs to be emptied in time. If the water drainage operation is felt to be too much work, the water can be mixed
with a suitable quantity of antifreeze fluid.
II. 2.6 ELECTRICAL CONNECTIONS
IMPORTANT!
Electrical connection of the unit must be carried out by personnel skilled in the matter and in compliance with the
regulations in effect in the country where the unit is installed. Non-compliant electrical connections relieve the firm. of
all liability for damage to property and personal injury.
54
D
1
D Valve
2
Electrothermal head
1
Valve body
2
COLD
COLD/HOT valve or cold/hot valve relay
HCA/4 22-35-50-60-80-120
1 2 3 4
HOT