Daitsu ELITE 3CSD3000] Manuel D'utilisateur page 55

1. Piping connection
Once the bracket is assembled and the collector attached, you can connect the collector output pipe to the tubes.
2. Choice of material for the tubes
Normally, 13 or 15 mm-diameter copper pipes are used for most solar panel installations. Since the flow is slow, there is no need to
use a larger-diameter pipe; it will only increase the cost of the system and facilitate a loss of heat.
3. Pressure level
Regardless of the configuration of the installation, output pressure value control devices, expansion vessels or other devices must
be installed. The solar heat loop must be designed to operate at a maximum of 800 kPa (the relief valve PRV can function at 850
Pa) (800 kPa = 8 bar = 116 psi). In installations using high-pressure water, the system should be designed to operate at <500 kPa,
so a pressure limiter/reducer valve should be used.
4. Tempering value
The installation of a temperature control ('tempering value') device on the hot water pipe between the water heater and bathrooms
and toilets is recommendable and may be required under current regulations, to reduce the risk of scalding. In this respect, the water
temperature should remain below 50ºC/122ºF (may be regulated).
5. Inserting a temperature probe
The solar heat controller's temperature probe should be given a thick coat of thermal paste and should be inserted as far into the
probe port as possible. If it is loose, slide in a copper strip or wire next to the probe. Seal the probe port opening with silicone sea-
lant to stop water getting in. The probes used in the collector must be specified as being resistant to high temperatures (up to
250ºC/486ºF), in particular the cable.
PLUMBING
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