SDT/SET
Installation & Operation Manual
7
Maintenance
Make sure that the rest of the solar, boiler and domestic water
piping is free of leaks.
•
If there is an oil lubricated circulator in the system,
make sure it is lubricated as called for by the circulator
manufacturer.
•
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.
The Lochinvar SDT/SET series indirect water heater is an
extremely simple device and it requires very little maintenance.
There are, however, several items which should be inspected
on an annual or as needed basis to ensure a reliable supply of
hot water:
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.
WARNING
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 damage.
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.
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
1. Close the water heater drain valve by turning the knob
clockwise.
2. Open the cold water supply shutoff valve.
3. Open several hot water faucets to allow air to escape from
the
system.
4. 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.
DANGER
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.
WARNING
Water from opened drain valves, unions and
other connections may be extremely hot.
To avoid severe personal injury, death, or
substantial property damage:
-
Tighten all drain hose connections.
- Direct hot water away from all
persons.
•
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, as listed in the
Clinical
Toxicology of Commercial Products.
A maximum 50/50 mixture
of inhibited propylene glycol is recommended. Follow the
antifreeze manufacturer’s instructions.
WARNING
Do not use automotive, ethylene glycol
or petroleum-based antifreeze. Do not use
any undiluted antifreeze. This can cause
severe personal injury, death, or substantial
property damage.
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.
Follow instructions on circulator to oil, if required.
Check mixing valve, valves, pipes, and fittings for leaks.
Check function of the field-installed controls and valves.
See component manufacturer’s instructions.
Review homeowner’s maintenance responsibilities and
their frequencies, including any not listed in the
following
section.
21
To Drain the Water Heater
Should it become necessary to completely drain the water heater,
be sure to follow the steps below:
1. Disconnect the power supply from the heat source. Consult
a plumbing professional or the electric company in your
area for service.
2. Close the cold water supply shutoff valve.
3. Open the drain valve on the water heater.
4. Open a hot water faucet to allow air to enter the system.
