M15-1.doc - 7 - Dehumidifier model Nader midi 2002
Description (A, B, C)
1.
2.
3.
4.
5.
Level switch
Tank pilot light (red)
Defrosting pilot light (yellow)
Humidistat
Fan
6.
7.
8.
9.
10.
Compressor
Electronic card
Temperature probe
Evaporator
Condenser
11.
12.
13.
14.
Dehydrator filter
Capillary
Humidistat knob
Air flow
Symbols used in the manual
SYMBOLS MEANING DESCRIPTION
Note Carefully follow the instructions and suggestions given.
Warning! Generic danger. Not following instructions can cause damages to the
machine, persons or things.
Introduction
The appliances of the NADER midi series are air humidifiers, the purpose of which is to remove humidity from the
environment. They are equipped with a refrigeration circuit, loaded with ecological gas R134a, fitted with an electronic
controlled defrosting system. These appliances were designed for a domestic and not industrial use.
Operating principle (C)
The appliance uses a fan (5) to suck up the air (14) to be dehumidified and pass it through the refrigerator circuit
evaporator (9). In this way the temperature of the air is lowered to below its dew point and the vapour condenses to
form drops of water that are collected in the appropriate tank. The amount of pollution in the water collected is
proportional to the amount of pollution in the environment. The air thus dehumidified is passed through the condenser
(10) that raises its temperature slightly higher than the initial value. In this way the quantity of humidity contained in the
environmental air is gradually decreased until it reaches the desired value. This means the humidity of the walls and
floor of the room, as well as the materials contained therein, is also lowered.
Defrosting (B, C)
When the room temperature drops below approximately 16°C, ice could form on the evaporator coil (9). In the
dehumidifiers of the NADER midi series the defrosting cycle is automatic, and is controlled by an electronic device (7),
that detects the presence of ice on the evaporator coil (9). The defrosting phase is signalled by the yellow pilot light (3)
on the control panel switching on; during this phase the compressor (6) stops. The duration of the defrosting cycle
depends on environmental conditions and the amount of ice that has formed on the evaporator (9).
Condensate collecting tank (B)
When the water reaches the maximum level in the condensate collection tank, the dehumidifier stops and the red pilot
light (2) on the control panel switches on. The tank can be extracted by first opening the front door of the appliance.
The tank is emptied by sliding open the door at the top of the tank. Once the tank has been emptied, it is important to
remember to close the door since it prevents the water from flowing out of the tank when the latter is moved or when the
dehumidifier is moved. To restart the appliance the tank must be put back into its lodging and this door also closed.
Besides indicating that the condensate collection tank is full, the red pilot light (2) also indicates
when the tank is missing or inserted badly. As long as the red pilot light (2) is on, the appliance
cannot operate at all.
The water can also be drained continuously by connecting a rubber hose with an internal diameter of 10 mm to the
connector found under the tank. The hose will leave the appliance through the hole on the dehumidifier bottom. Check
that the hose drains properly.
Rules for installation
The dehumidifiers of the NADER midi series are simply placed in the room to be dehumidified and started. To obtain
maximum efficiency keep to the following rules:
make sure that in the room, where the dehumidifier is installed, the conditions never exceed the working limits of the
machine (tab.2);
the room where the dehumidifier is installed must be closed;
