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DRE  

Electric commercial 
water heater

DRE - 52/80/120 

Three phase electric water heater, primarily for commercial 

applications • Three to nine Incoloy-sheathed elements with a 
maximum rating of 54 kW • Each element is independently 
controlled via its own control thermostat (adjustable: 49 - 82 °C) 
and a manually resetable high-limit thermostat • Cascade control 
of the elements for more effi cient and faster heating-up times 
• All elements and thermostats are fuse-protected • PermaGlas 
Ultra Coat second-generation glass coating technology helps to 
prevent corrosion • Replaceable magnesium anode • Safety fl oat 
switch • Optional ancillaries: Unvented kits • Destratifi cation pump 
kit • Powered anodes • Time controller • Alternate kW loadings

Summary of Contents for Dre 120

Page 1: ... own control thermostat adjustable 49 82 C and a manually resetable high limit thermostat Cascade control of the elements for more efficient and faster heating up times All elements and thermostats are fuse protected PermaGlas Ultra Coat second generation glass coating technology helps to prevent corrosion Replaceable magnesium anode Safety float switch Optional ancillaries Unvented kits Destratifica...

Page 2: ...26 1020 1314 90 min T 50 C l 416 641 1090 512 737 1186 1635 656 881 1330 1779 120 min T 50 C l 494 796 1399 590 892 1495 2099 734 1036 1639 2243 Continuous T 50 C l h 155 310 619 155 310 619 929 155 310 619 929 Heating up time T 50 C min 78 39 19 116 58 29 19 174 87 44 29 30 min T 55 C l 238 301 428 325 388 515 642 456 519 646 773 60 min T 55 C l 308 442 709 396 529 797 1064 526 660 927 1195 90 mi...

Page 3: ...nsion vent pipe A O Smith unvented system kits utilise combination valves Further installation and connection details can be found in the Installation Commissioning Manual A 1465 1570 1610 B 1410 1530 1580 D 550 640 750 E 690 800 910 M 120 100 100 R 100 100 100 S 1210 1310 1380 1 Cold water 11 4 14 NPT 2 Hot water 11 4 14 NPT 4 Tank drain valve 3 4 14 NPT 5 T P valve 3 4 14 NPT 6 Anode connection ...

Page 4: ... website A Main terminal B Solenoid D Overheat thermostat E Electric element H Float switch K Safety relay L Fuse M Transformator 1 Black 2 Red 3 Blue 4 Brown 5 White For the parts numbers of components please refer to the Maintenance and accessories chapter DRE Electrical diagrams 3 elements 6 elements 9 elements ...

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