Solahart 151J, Руководство пользователя

Страница: 54 / 60

SERVICING
54
Draining and Flushing the Solar Storage Tank and Collectors
It may be necessary to drain or flush the solar storage tank of an open or closed circuit system or the solar collectors of an
open circuit system during maintenance or if there is sediment in the water supply. This should be conducted in the
morning, within three (3) hours of sunrise when the sun is low in the sky. The water or closed circuit fluid temperature
inside the solar collectors should be lower as the solar collectors would not have had as much chance to gain as much heat
as later in the day.
Warning: Exercise care to avoid splashing of water, as water discharged from the solar storage tank and solar
collectors may be of a very high temperature.
Note: The water discharged from the solar storage tank and solar collectors may contain sediments and should be diverted
away from any section of roof which is part of a rainwater collection system.
Prior to draining and / or flushing the solar storage tank and / or solar collectors:
Open and Closed circuit system
1. Cover the solar collectors with an opaque material to prevent absorption of solar energy and the transfer of heat to the
solar storage tank. If fitted, cover the HartStat valve with a cloth soaked in cold water.
Failure to cover the solar collectors may cause a safety issue.
2. Open a hot water tap and allow the water to run for five minutes immediately prior to draining or flushing the solar
storage tank and / or solar collectors.
This will assist in the transfer of any high temperature water in the solar collectors to the solar storage tank of an open
circuit system or heat from high temperature closed circuit fluid in the heat exchanger and solar collectors to the water
in the solar storage tank of a closed circuit system.
3. Close the hot water tap.
4. Turn off the water heater. Refer to
“To Turn Off the Water Heater ” on page 28.
5. Ensure all hot water taps are closed.
Closed circuit system
6. Attach a hose to the valve drain port of the fill drain valve assembly.
Place the end of the hose into a container.
Place an absorbent cloth on the roof under the fill drain valve assembly prior to loosening the screw. This will assist in
catching any spilt closed circuit fluid.
7. Loosen (but do not remove) the valve screw on the fill drain valve assembly a few turns to open the valve drain port.
This will release the pressure in the closed circuit.
8. When the pressure is relieved, tighten the valve screw on the fill drain valve assembly.
9. Very carefully, unscrew the PR6 or PR200 closed circuit relief valve on the left side of the solar storage tank to
relieve the pressure from the closed circuit.
Note: It is important the closed circuit is not pressurised whilst the storage tank is unpressurised.
Warning: Relieved air or closed circuit fluid may be hot.
Open and Closed circuit system
10. Operate the temperature pressure relief valve lever - do not let the lever snap back or you will damage the valve seat.
It is very important the lever is raised and lowered gently .
Operating the lever will release the pressure in the solar storage tank.
Draining and Flushing the Solar Storage Tank
Open circuit system
11. Undo the union at the cold water inlet to the solar cold pipe.
12. Undo the fitting and remove the solar cold pipe from the solar storage tank.
Connect a hose to the tank connection. Let the other end of the hose go to a drain.
Closed circuit system
13. Undo the union at the cold water inlet to the solar storage tank and attach a hose.
Let the other end of the hose go to a drain.