Rheem 491 Owner's Manual And Installation Instructions page 29

SEISMIC RESTRAINT
New Zealand Building Code Clause B1.3.2 requires building elements (including
storage water heaters) to be adequately supported including support against
earthquake forces. This water heater must be restrained to protect against
seismic forces.
ANODE
The vitreous enamel lined cylinder of the water heater is only covered by the
Rheem warranty when the total dissolved solids (TDS) content in the water is
less than 2500 mg/L and when the correct colour coded anode is used. If an
incorrect colour coded anode is used in the water heater, any resultant faults will
not be covered by the Rheem warranty. In addition, the use of an incorrect colour
coded anode may shorten the life of the water heater cylinder.
The correct colour coded anode for the water supply being used must be
selected and fitted to the water heater for the Rheem warranty to apply to the
water heater cylinder (refer to "Water Supplies" on page 17 and the Anode
Selection chart on page 18). The black anode is typically fitted as standard.
Total Dissolved Solids
0 – 40 mg/L
40 – 150 mg/L
150 – 400 mg/L
400 – 600 mg/L
600 – 2500 mg/L
2500 mg/L +
If the water supply has a TDS greater than 150 mg/L and a green anode has not
been changed to a black anode, or if the TDS is greater than 600 mg/L and the
anode has not been changed to a blue anode, there is the possibility the anode
may become overactive and hydrogen gas could accumulate in the top of the
water heater during long periods of no use. In areas where this is likely to occur,
the installer should instruct the householder on how to dissipate the gas safely
(refer to "Caution" on page 18).
SADDLING PIPE WORK
To prevent damage to the cylinder when attaching pipe clips or saddles to the
water heater jacket, we recommend the use of self-drilling screws with a
maximum length of 13 mm. Should pre-drilling be required, extreme caution must
be observed when penetrating the jacket of the water heater.
Note: If the cylinder is damaged as a result of attaching pipe clips or
saddles to the jacket, any resultant faults will not be covered by the Rheem
warranty.
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Anode colour code
Green
Green or Black
Black
Black or Blue
Blue (no cylinder warranty)
29
Blue