Replacement Of Parts; Changing The Thermostat; Troubleshooting - NTI COMPACT Serie Manual De Instrucciones

Descaling the heating element
Scale deposits can affect the heating capability of the element.Heavy scale can even cause the element to burn out. The element
can be descaled either chemically or manually:
A) Soak the element in white vinegar or other descaling solution. Once descaled, rinse well with fresh water, to which you should
add some baking soda, OR
B) Once the element has dried up, use a soft brush (non metallic to prevent damaging the stainless steel sheath) on element. Brush
the dried mineral off. Reinstall the element with gasket and make the wire connections.
C) Replace anode rod (N Fig. 5/2) if it is noticeably deteriorated or considerably shorter then seen in figure 5/2.
WARNING: make sure the tank has been refilled with water before restoring power.

REPLACEMENT OF PARTS

Changing the heating element
1. Turn off power supply and drain the heater (see Draining the Heater).
2. Remove the heating element (see section on Removing the Heating Element).
3. Install new element with gasket, making sure the gasket and element are positioned correctly. Tighten the retaining nuts and
make the wire connections. Ensure that the thermostat temperature sensor is inserted into the well located on the element
assembly and secured with black rubber grommet.
4. Refill tank with water before restoring power.

Changing the thermostat

1. Turn off power supply.
2. Disconnect the 2 wire connectors on thermostat.
3. Loosen the two brass screws at right side of thermostat and pull wires out.
4. Unscrew and remove the two phillips screws holding the thermostat onto the tank.
5. Install new thermostat and re-attach wiring and screws. Ensure that the thermostat temperature sensor is inserted into the well
located on the element assembly and secured with black rubber grommet.

2.2 TROUBLESHOOTING

Reset ting High Limit Switch
Occasionally, the high temperature limit shut off device may trip the reset. This occurs when water temperature exceeds
190° F. The shut off device may also trigger from a power outage or electrical storm.
To reach the thermostat:
1. Disconnect power cord and remove the front cover. Firmly press reset button (B Fig. 4) with the tip of a ball point pen or similar
object. A click indicates the reset was tripped. Reconnect power
2. IMPORTANT: Check the operation of the thermostat, turn temperature dial from high to low, if the red light does not go off on low
setting, turn off power supply and call a service person to replace the thermostat
3. If the system works, place dial setting to desired setting. Note: a lower setting is more economical and reduces the risk of scalding.
Replace cover plate.
CAUTION : Call a technician if the high limit need to be reset frequently.
Water does not get hot
1. Make sure the power supply is on and working.
2. If light does not come on, check that the high limit reset button is pushed in; follow steps above.
3. If the indicator light works properly but temperature does not get hot at the tap, test for a plumbing crossover; shut off cold supply to heater
and open hot water tap. There should be no water flowing. Any continued flow indicates a crossover which will effect the temperature
and will need to be corrected.
4. Call a qualified service technician to test the resistance of the heating element (8-10 ohms). Heating element should be replaced
if readings are outside these values.
Light not on
1. If the light does not come on, but water gets hot, check for faulty bulb.
2. Check that the high limit reset button is pushed in; follow steps above.
Brown water
1. Brown or rusty water indicates a "spent" anode rod and possible deterioration of the tank body. Inspect the tank for leaks.
Odor in water
1. Smelly water could be due to an unusual reaction between local water and the heater's anode rod. Check anode rod (see section on
Inspecting the anode rod). Failure to do so may result in damage to the tank and leaks.
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