Solahart 151J, Руководство пользователя

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53
SERVICING
Draining the Closed Circuit Fluid
It may be necessary to drain the solar collectors and heat exchanger of a closed circuit system during maintenance.
Draining the solar collectors and heat exchanger of closed circuit fluid should be conducted within three (3) hours of
sunrise when the sun is low in the sky. The 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 closed circuit fluid, as fluid discharged from the solar collectors may be
of a very high temperature.
Note: Care must be taken to ensure there is no spillage of the closed circuit fluid onto the roof surface. Any spilled closed
circuit fluid must be cleaned up immediately and the roof surface cleaned of any fluid residue. The closed circuit fluid
discharged from the solar collectors can render the water in a rainwater tank unusable.
Draining the Solar Collectors and Heat Exchanger
1. Cover the solar collectors with an opaque material to prevent absorption of solar energy. 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 the solar storage tank.
This will assist in the transfer of any heat from high temperature closed circuit fluid in the heat exchanger and solar
collectors to the water in the solar storage tank.
3. Close the hot water tap.
4. Attach one end of a hose to the valve drain port of the fill drain valve assembly and place the other end into a
container of sufficient volume to hold the closed circuit fluid.
Refer to the table on page 31 for the volume of closed circuit fluid in the closed circuit of the water heater.
5. 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.
6. Loosen 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.
7. Very carefully, unscrew the PR6 or PR200 closed circuit relief valve on the left side of the solar storage tank.
Warning: Relieved air or closed circuit fluid may be hot.
Closed circuit fluid will drain through the hose.
8. Allow the closed circuit fluid to drain into a container and dispose of in accordance with the relevant local authority.
Warning: Closed circuit fluid may be hot.
9. When satisfied the closed circuit is drained, tighten the valve screw on the fill drain valve assembly.
Remove the hose from the valve drain port of the fill drain valve assembly.
10. Refit and tighten the PR6 or PR200 closed circuit relief valve on the left side of the solar storage tank.
11. To refill the solar collectors and closed circuit, refer to
“Closed Circuit Commissioning Procedure”
on page 33.