MAINTENANCE MANUAL
GP/146/99. Issue 9. October 2005
PROTECTION AGAINST FROST
As a precautionary measure, when frost is anticipated, drain all water from the pump
and its ancillaries.
The pump is drained by removing the drain plug from the base of the volute. It is
highly recommended that this is removed and the volute fitted with a drain valve
system terminating with a ball valve at a convenient location on the vehicle. The
high-pressure side of the pump will automatically drain down into the low- pressure
side (patent applied for), so that only one pump drain point is required.
If the primer exhaust is piped away to above the primer outlets, these must be
provided with drain valves.
In order to completely drain the piston priming system the pump should be idled for a
few seconds after use with no water in the volute and the drain valve open. This ‘dry
prime’ will then evacuate all residual water from the priming system.
If the water ring primer is fitted, it is drained by removing the drain plug at the base of
the water trap housing.
It is not recommended that the pump be retained full of water since this could result
in freezing in cold climates.
IMPORTANT:
It is essential to carry out the pump tests detailed in Section 13
whenever any part of the pump or priming system is dismantled.
This will ensure that reassembly has been carried out correctly
and that there are no leaks.
©Hale Products Europe LTD, Warwick
GP/146/99
WTmaint - Issue9. 10-2005October 2005
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