Maintenance Instructions - Ariston GL 2.5 User Manual

Maintenance instructions

Note: Do not attempt to repair this water heater yourself. Call a service person
for assistance. Always turn off the power supply to the heater prior to
servicing or draining the heater.
PERIODIC MAINTENANCE AND PARTS REPLACEMENT
Note: For most of these operations, the water will have to be drained from the heater.
For all of these operations the power supply needs to be shut off and the front
cover removed.
Remove cover plate V (fig. 3/4) using a thin screw-driver operating on
point W (fig. 3/4). Unscrew the screw below and lift the cover C (fig. 3/4).
When reassembling work in the opposite way being careful to insert first
the tongue of the cover into the slot.
Draining 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
the Heater
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
1. Turn off power supply and drain the heater (see previous section).
the heating 2. Remove the front cover plate, disconnect terminals X, Y and T (fig. 3/3).
3. Unscrew the 4 heating element retaining nuts F (fig. 3/3).
element
4. Remove the element. G (fig. 3/1).
Descaling 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
the heating
either chemically or manually:
element
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 if considerably shorter then diagram.
WARNING: make sure the tank has been refilled with water before restoring power.
REPLACEMENT OF PARTS
The anode rod (N fig. 3/2) helps protect the tank against corrosion. Depending on the
Changing
water condition, the magnesium anode rod may need to be changed every year or so.
the anode
Galvanic and electrolytic corrosion can destroy a tank if the anode rod is "spent".
rod
Rusty water is usually an indication of a "spent" anode rod. If rusty water is present,
examine anode rod immediately. Rapid degradation of the anode rod (less than 1
year) may indicate the presence of galvanic corrosion due to "stray" direct current. In
this case, it may be necessary to add a "grounding strap" from the Ariston tank to the
copper plumbing.
1. Turn off the power supply and drain the heater (see previous section).
2. Remove heating element (see previous section).
3. Remove and replace the anode rod N (fig. 3/2).
4. Refill tank with water before restoring power.
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