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Maintenance - Bosch SST150-40 Installation And Operating Manual

Indirect fired water heaters
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7 Maintenance

The SST series indirect water heater is an extremely
simple device and as such requires very little maintenance.
There are, however, several items which should be
checked out on an annual or as needed basis to ensure a
reliable supply of hot water:
• Make sure that the rest of the boiler and domestic water
piping is free of leaks.
• The indirect water heater depends upon the boiler for a
source of heat and is therefore only as reliable as the
• Make sure that the boiler is maintained in accordance
with the boiler manufacturer's instructions.
• If a water treatment system is required to keep the water
chemistry within the parameters shown in Table 2A (see
Section 2 - Pre-Installation), make sure that this system
is properly maintained.
Maintenance Schedule
Annual service by a qualified service technician should
include the following:
Any procedure required by local codes.
Verify system pressure. Air venting procedure may
require adding water to bring boiler system up to
pressure, typically 12 psig.
Manually operate T&P relief valve at least once a year.
This will release some hot water.
Before operating a T&P relief valve, make sure no
one is in front of or around the T&P relief valve
discharge piping. Hot discharge water can cause
severe personal injury or substantial property
Move operating lever to open position for a few
seconds and then move it back, allowing it to snap
closed. After the T&P relief valve is operated, if it
continues to release water, close the cold water inlet
to the water heater immediately. Follow the draining
instructions, and replace the T&P relief valve. If the
T&P relief valve weeps periodically, it may be due to
thermal expansion. Do not plug the T&P relief valve or
discharge piping.
Plugging the T&P relief valve or discharge piping can
cause excessive pressure in the water heater,
resulting in severe personal injury, death, or
substantial property damage.
Indirect Fired Water Heaters Installation and Operating Manual
Installation & Operating Manual
Review homeowner's maintenance responsibilities
and their frequencies, including any not listed in the
following section.
Homeowner monthly maintenance to include:
Visually check valves, pipes, and fittings for leaks. Call
a qualified service technician to repair leaks.
To Fill the Water Heater
Close the water heater drain valve by turning the knob
Open the cold water supply shutoff valve. Open
several hot water faucets to allow air to escape from
the system.
When a steady stream of water flows from the faucets,
the water heater is filled. Close the faucets and check
for water leaks at the water heater drain valve,
combination temperature and pressure relief valve and
the hot and cold water connections.
Water from opened drain valves, unions and other
connections may be extremely hot. To avoid severe
personal injury, death, or substantial property
- Tighten all drain hose connections.
- Direct hot water away from all persons.
To Drain the Water Heater
Should it become necessary to completely drain the water
heater, be sure to follow the steps below:
Disconnect the power supply to the heat source.
Consult the plumbing professional or electric company
in your area for service.
Close the cold water supply shutoff valve.
Open the drain valve on the water heater.
Open a hot water faucet to allow air to enter the
Drain the water heater if it will be shut off and exposed to
freezing temperatures. Freezing water will expand and
damage the water heater.
• If boiler water contains sufficient antifreeze, then only
the domestic water needs to be drained.
• If boiler water does not contain sufficient antifreeze, the
boiler water and the domestic water must be drained.
If antifreeze is used in the boiler water, check
concentration. Boiler water (including additives) must be
practically non-toxic, having a toxicity rating or class of 1,
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