Failure to comply can result in explosion or fire. Hazardous area terminal enclosures are available, consult your local Chromalox representative for details. The NWHMTO series is a general-purpose oil circulation heater intended for use indoors. The 3 steel sheathed tubular elements are centered in a 2-1/2” diameter steel heating chamber and welded to a removable screw plug. The assembly is surrounded by 1-1/2” insulation and sheet metal jacket. Depending upon the specifications, the NWHMTO may

2. This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmospheres are present as defined in the National Electrical Code. Failure to comply can result in explosion or fire. For these applications see PDS CXH-EP (PF305). MAINTENANCE WARNING: Turn off all power to service heater. Do not attempt to service heater while unit is operating as there is hazard of electric shock, injury from operating fan and burns from hot heating ele

. *Note: Fuse 3A 600V KTK-3 — 128-047763-007 (2) Fuse BLK Barrier — 129-048475-001 (1) Fuse Block — 129-048473-001 (2) RENEWAL PARTS IDENTIFICATION 9 RELAYS Model Volts Phase kW Motor Relay UB-1002E 208 1 10 120V 072-303180-008 UB-1002E 208 1 10 208V 072-303180-014 UB-1002E 208 3 10 120V 072-303180-007 UB-1002E 208 3 10 208V 072-303180-013 UB-1002E 240 1 10 120V 072-303180-008 UB-1002E 240 1 10 240V 072-303180-014 UB-1002E 240 3 10 120V 072-303180-007 UB-1002E 240 3 10 240V 072-303180-013 UB-100

*Wall and/or Ceiling Mounting Brackets are Height Above available as an accessory option — ContactFloor 12-1/4” 8” 6” your local sales representative. Specifications — Rubber Feet Provided for Wall Mount Model Only. 7/8” and 1-23/32” Dia. Holes in Rear 13-3/4” 17-1/8” 20-3/4” 11-3/4”9-5/16” Ceiling Line Wall Back Wall 6” Min. Spacing to Adjacent Wall3” 4-7/8” Min. 11-3/4” 17-11/16” 7’-0” Min. Height Above Floor Mounting Holes Center 10” 8” Figure 2 Mounting UB using Wall Mounting Brackets* Model

WIRING DIAGRAMS 3 Use with: UB-1002E 208V, 1O or 3O 240V, 1O 480V, 1O or 3O UB-1252E 208V, 3O 240V, 3O 480V, 1O or 3O UB-1502E 208V, 3O 240V, 3O 480V, 1O or 3O UB-2002E 480V, 1O or 3O 240V, 1O or 3O WIRING DIAGRAMS 4 Use with: UB-1002E-T 480V, 1O or 3O UB-1252E-T 480V, 1O or 3O UB-1502E-T 480V, 1O or 3O UB-2002E-T 480V, 1O or 3O Figure 5 Use with: UB-1002E-R 208V, 1O or 3O 240V, 1O or 3O 480V, 1O or 3O UB-1252E-R 208V, 3O 240V, 3O 480V, 1O or 3O UB-1502E-R 208V, 3O 240V, 3O 480V, 1O or 3O UB-200

Although the safety of installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations. OPERATION DANGER: 2. This heater is not intended for use in hazardous 1. Do not restrict air-flow through the heater by atmospheres where flammable vapors, gases, liqplacing fabric or other obstructions in front of or uids or other combustible atmospheres are present behind the heaters. With some combustible as defined in the National Electrical Code. Failure materials

For these tures could cause a fire. applications see Bulletin PDS CXH-EP PF305. MAINTENANCE WARNING: Turn off all power to service heater. Do not 2. Following long periods of idleness, heater should be vacuattempt to service heater while unit is operating as umed before start-up, to remove accumulated combustible par- there is hazard of electric shock, injury from operat-ticles which otherwise may smoke or incinerate on initial heat ing fan, and burns from hot heating elements. up. 3. Periodical

No. Plug Fig. No. HF203G AC C 120V1P 1,900 15.8 6 3 HF203G AC C 240V1P 2,000 8.3 6 4 HF303H AC* C 120V1P 3,000 25.0 7 — HF303G AC C 240V1P 3,000 12.5 7 3 HF403G AC C 240V1P 4,000 16.7 7 5 HF203EG DC E 120V1P 1,900 15.8 9 3 HF203DG DC E 240V1P 2,000 8.3 8 4 HF303E DC* E 120V1P 3,000 25.0 12 — HF303DG DC E 240V1P 3,000 12.5 11 4 HF403E DC** E 240V1P 4,000 16.7 11 — * Cord Only, no plug. ** Without Cord and plug. 12-5/8” 11-3/8” 13-3/16” 1” 8” 9-3/4” Figure 2 Figure 2A GENERAL Hazard of Fire or Dis

......................... Page ii Dimensions and Panel Cutout .................................................................................................... ........................ 1 Wiring ......................................................................................................................... .................................................. 2 Hardware Setup .................................................................................................................

When the floor is to be finished in carpet, allow clearance under the heaters and corners for carpet installation. Bottom air inlet heaters are to be mounted a minimum of 2” from the finished floor. WARNING: Hazard of Fire. Rugs may be placed up to a heater provided that they are not of a thickness that would block the air-intake. Bottom air inlet heaters are to be mounted a minimum of 2” from the finished floor. Figure 1: Furniture & Drapes GENERAL Draft Barrier Heater Installation (Wall) 1. On