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Explanation: WRG could stand for Wasserrückgewinnung
I got only a few hits for water recovery pumps, one of them being:
Environmental Group Services, Ltd.
... steam condensed water is retrieved from ground through the pneumatic operated
water recovery pumps set in wells The recovered water is steam stripped and ...
egsl.com/seves/seves.html - 7k
Also tried WRG-Pumps and here are a couple of those hits:
UK Inland Waterways humour : Reg at Rickmansworth's tips for ...
... a secondary navigation function. In many locations the apparently permanently-installed
WRG pumps (some of them already listed by English Heritage - and their ... www.mike-stevens.co.uk/cutmisc/humour/regwater.htm
Canal Cuttings - 3.4 - Winter, Spring, Summer 1996
... since the new bottom had been put on. This was done with a pump kindly lent to us
by WRG North West. During this process the hatch covers were pulled up into ... www.scars.org.uk/34rest.htm - 7k
Hope this helps!
Beth Kantus United States Local time: 04:54 Native speaker of: English PRO pts in category: 4
Explanation: ohne weiteren Kontext über die allgemeine Anwendung, ist es schwer mehr zu sagen. Wärmerückgewinnung (heat recovery) ist eine Möglichkeit, es könnte auch der Name eines Pumpenherstellers sein, allerdings kenne ich keine Firma die so heisst.
Den Satz würde ich jedenfalls übersetzen mit:
If the dry contact is closed, the water pump shall be switched on.
Uta Moerschell Local time: 10:54 Specializes in field Native speaker of: German