Maxwell MXW 1500 A, Instruction Manual

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If in any moment the door contact closes, the air curtain goes to the selected speed. If the door contact
opens, it will come back to the automatic operating after a delay time. The delay time is selectable
through switches 5 and 6.
CH functions (Hand-Auto):
•
Anti-frost thermostat: When the temperature decreases below the selected in the anti-freezing
sensor, the fans stop and the electro valve opens (the frost alarm is indicated by a lighted red led and
the electro valve by a green led). This is to protect the water coil against freezing and it works even
with the air curtain stopped. In case of no installation of the anti-frost thermostat, place Switch 4 in
ON position.
•
Door contact: Only in automatic functioning. When the door opens, the air curtain changes
automatically the fan speed to the programmed one (indicated by a lighted orange led). Other type of
detectors can be used (movement sensors, infrared, etc…).
•
Room thermostat: Modifies the ventilation speed (and at the same time the heating power)
depending on the programmed speed and the switch nº 1. For detailed explanation see the section of
automatic operating.
Programmable switches (controller CH):
A block of seven micro switches placed inside the controller, allows the customer to program the
functions of the air curtain as follows:
•
Switch 1: It modifies the air curtain control in automatic mode depending on the room thermostat.
Detailed explanation in the automatic operating section.
•
Switch 2: Door contact inverter. Position OFF-NO (normally open), position ON-NC (normally
closed).
•
Switch 3: Room thermostat inverter. Position OFF-NO, position
ON-NC.
•
Switch 4: Anti-frost thermostat inverter. Position OFF-NC,
position ON-NO.
•
Switches 5 and 6: The combination of these two switches
allows the customer to set the delay time to go back to the
normal function alter the door is closed.
Switch 5 Switch 6
Off
Off 10 Sec.
On Off 40 Sec.
Off On 80 Sec.
On On 120 Sec.
•
Switch 7: It permits to choose between memory ON/OFF.
Wiring diagrams
Following connection diagrams are enclosed:
•
Warm water heated or only air without regulation. Diagram: AIRDOE11701
•
Warm water heated or only air with regulation. Diagram: AIRDOE11711
In case you need to connect the equipment to a PLC, the corresponding connections diagrams will be
supplied.