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3.10 Water Treatment - Bosch 660 EF User Manual

Indoor model/ natural gas/lp gas boilers
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Supply water piping
• Do not use PVC, iron, or any piping which has been
treated with chromates, boiler seal or other chemi-
cals.
• Mount a check valve and a shut off valve (near the
inlet).
• In order for the client to use the water heater comfort-
ably, 29 to 70 psi of pressure is needed from the
water supply. Be sure to check the water pressure. If
the water pressure is low, the water heater cannot
perform to its full capability, and may become a
source of trouble for the client.
Drain piping
• Expansion water may drop from the pressure preven-
tion device and wet the floor. If necessary, provide
drain piping or use a drain hose to remove the water.
Hot water piping
• Do not use lead, PVC, iron or any piping which has
been treated with chromates, boiler seal or other
chemicals.
• The longer the piping, the greater the heat loss. Try
to make the piping as short as possible.
• Use mixing valves with low water resistance. Use
shower heads with low pressure loss.
• If necessary, use a pump or other means to ensure
that the supply water pressure to the inlet of the
heater does not fall below 29 psi when the maximum
amount of water is being demanded. Install a pres-
sure meter on the inlet to confirm proper water pres-
sure.
Damage to the water heater as a result of poor water
quality is not covered by the Limited Warranty. To
ensure full warranty coverage, treat or condition water
that exceeds the target levels provided in this table.
Source: EPA National Secondary Drinking WaterRegu-
lations (40 CFR Part 143.3)
Description
1)
Total Hardness
Aluminum
Chloride
Copper
Iron
Manganese
pH
Total Dissolved Solids
Table 4
6 720 644 063
Max. Levels
100 mg/L (6 gpg) or less
0.05 to 0.2 mg/L or less
0.05 to 0.2 mg/L or less
1 mg/L or less
0.3 mg/L or less
0.05 mg/L or less
6.5 - 8.5
500 mg/L or less
Description
Zinc
Sulfate ion
Residual chlorine
Table 4
1)
Maximum limit suggested by Bosch.

3.10 Water Treatment

If this water heater will be installed in an application
where the supply water is hard, the water must be
treated with either a water softener, which removes the
hardness, or by using sequestering agents, that reduce
the amount of scale deposits. Refer to the below tables
for suggested treatment and maintenance measures to
be taken based on the water hardness level. Damage
to the water heater as a result of water in excess of 6
gpg (100 mg/L) of hardness is not covered by the
Bosch Thermotechnology Corp. Limited Warranty.
When installing a water softener, consult
i
with the manufacturer for proper sizing
and installation guidelines; the below dia-
gram is for reference only.
Residential Use Treatment Guidelines
Type of
Hardness
Water
Level
Soft
0-1 gpg
(0-17 mg/L)
Slightly Hard
1-3 gpg
(17-51 mg/L)
Moderately
3-6 gpg
Hard
(51-100 mg/L)
Hard
6-10 gpg
(100-171 mg/L)
Very hard
10-14 gpg
(171-239 mg/L)
Extremely Hard
> 14 gpg
(> 239 mg/L)
Table 5
1)
Install Bosch Isolation Valves to allow for flushing.
Installation instructions
Max. Levels
5 mg/L or less
250 mg/L or less
4 mg/L or less
Treatment
Flush
1)
Device
Frequency
None
None
None
None
Water Softener
Once a Year
Water Softener
Once a Year
Water Softener
Softener
Required
Water Softener
Softener
Required
25

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660 efo