A.O. Smith DRE - 52/80/120 user manual

Summary of the content on the page No. 1

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

Summary of the content on the page No. 2

DRE Technical specifications Electrical data Input kW 9 18 36 9 18 36 54 9 18 36 54 Current A 11-13 23-25 46-50 11-13 23-25 46-50 69-75 11-13 23-25 46-50 69-75 Elements - 3 3 6 3 3 6 9 3 3 6 9 Power supply V AC/Hz 415 / 50 Draw-off capacity Storage capacity l 200 300 450 Max. temperature setting °C 82 82 82 82 82 82 82 82 82 82 82 30 min. ∆T=44°C l 297 377 535 406 486 6

Summary of the content on the page No. 3

DRE Dimensions 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 1 Cold water 1 /4-14 NPT 1 2 Hot water 1 /4-14 NPT 3 4 Tank drain valve /4-14 NPT 3 5 T&P valve /4-14 NPT 3 6 Anode connection Rp /4 Dimensions in mm. All DRE water heaters receive a three years warranty on the tank and one year on parts. DRE 1 Pressure reducing valve Installation diagrams 3 T&P valve 4 Stop valve V ented 5 N

Summary of the content on the page No. 4

DRE Electrical diagrams A Main terminal 3 elements 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. 6 elements 9 elements www.aosmithinternational.com Data subject to change INT/0808/DRE/01 Terms and conditions apply, please refer to our website.