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RECOMMENDATIONS FOR HYDRAULIC CONNECTIONS
1. It is recommended that all units are connected to a water supply and return pipe system of the Tickelman
Loop type. The Tickelman Loop system is self-balancing and thus only requires manual balancing if
a large number of units with different flow and pressure loss characteristics are connected to a single
hydraulic loop. A very simple way of checking the hydraulic balance is to measure the temperature
difference between the water connections. To ensure a correct water flow, the difference must be in
the region of 3 to 7 °C in Cooling mode and 2 to 5°C in Heating mode.
A system with two parallel pipes can also operate in a perfectly adequate manner, but it is more
difficult to achieve, and to maintain, balance.
2. Steel, copper or P.V.C. pressure pipes may be used.
3. It is advisable to make the unit’s water supply and return conveyance lines with short lengths of high-
pressure hose, as they form excellent shock absorbers for unit operating noise and hydraulic pressure
surges.
One of the hose ends must be fitted with a rotating connector to facilitate removal for maintenance.
Rigid pipes can be connected directly to the unit, but this is not recommended due to their inability
to absorb vibrations and noise.
Rigid pipes must be equipped with removable connectors to facilitate future removal of the unit from
its location.
4. Certain flexible hose threaded connectors are supplied with sealing paste. If this is not the case, use
Teflon tape to create a tight seal.
5. Each unit must be equipped with isolation valves on the water inlet and outlet pipes. The return
isolation valve is used for both cutting off the water supply and balancing the installation’s water flow.
As it is used to establish the balance of the flows,
it must be equipped with a lockable position
end stop
. This end stop ensures that, after the valve is closed, it can only be re-opened as far as
the position required to maintain a balanced water flow.
HYDRAULIC CONNECTIONS
Main return pipe work
Siphon
Hoses
Spherical dome
valve
Main water supply
pipe work
Main condensate drainage
pipe work
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Summary of Contents for HRW 07
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