Periodic Maintenance - NTI COMPACT Série Instructions D'installation Et D'utilisation

2.1 PERIODIC MAINTENANCE

Removing the cover
Note: For most of these operations, the water will have to be drained from the heater. For all of these operations the cord
should be disconnected and the front cover removed.
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When reassembling, work in the opposite
way being careful to insert the tongue of the cover into the slot.
Draining the Heater
1) If the heater has been installed with flexible hoses, shut off the power supply and turn the heater upside down over a sink to
drain the water out of it, OR
2) If the heater has been installed with rigid piping, siphon the water out through any (lower) service valve on the (inlet side). Keep a
hot water faucet open while siphoning the water out, OR
3) If the heater has been installed with flexible hoses, it can also be emptied by siphoning through the inlet side hose. Keep a hot
water faucet open while siphoning.
Removing the heating element
1. Turn off power supply and drain the heater (see previous section).
2. Remove the front cover plate, disconnect terminals X, Y and T (fig. 3/2).
3. Unscrew the 4 heating element retaining nuts F (fig. 3/2).
4. Remove the element. G (fig. 5/1).
Inspecting the anode rod
The purpose of the anode rod (N Fig. 5/2) is to protect the tank against corrosion. It is critical that the anode rod be inspected
once a year to determine whether it requires replacement. To access the anode rod, the heating element must be removed (see
Section Removing the heating element). Upon inspection, the anode rod surface should appear smooth. If the rod surface appears
pitted, bumpy, rusty, or if the rod is missing completely, then it must be replaced.
For original anode rod sizes:
• NTI COMPACT 2.5, NTI COMPACT 4: length 6 _", diameter 5/8"
• NTI COMPACT 6: length 8 _", diameter 5/8"
Certain installations may require more frequent replacement of the anode rod:
• recirculation applications;
• poor water quality;
• galvanic/electrolytic corrosion
• High flow applications
Rusty water is usually an indication that the anode rod requires replacement. If rusty water is present, examine the anode rod
immediately and replace as needed. In the event of poor water quality, we recommend consulting a local water treatment
professional for water treatment options. Always ensure the water heater is grounded. Damage resulting from failure to replace
the anode rod is not covered under the manufacturer's warranty. For additional questions, please call Bosch Technical Service.
To change the anode road:
1. Turn off the power supply and drain the heater (see Draining the Heater).
2. Remove heating element (see previous section).
3. Remove and replace the anode rod N Fig. 5/2.
4. Refill tank with water before restoring power.
G
6
FIG. 5/1
N
FIG. 5/2