Chromalox UB-1502E, UB-2002E, UB-1252E, UB-1002E Operation, Maintenance, Wiring Diagrams

WIRING

Note: All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person.

WARNING: Hazard of Electric Shock. Any installa- tion involving electric heaters must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.

1.Connect heater according to the voltage and frequency speci- fied on the nameplate and using the appropriate wiring diagram (Figures 3 thru 7).

Note: Be sure to check voltage rating of the fan motor which is either 120, 208 or 240 volt, single phase since heater circuit could be 480 volts, single or three phase.

2.If an external transformer is used to step down the voltage for oper- ating the fan motor, use appropriate wiring diagram (Figures 3, 5 or 7).

3.Heaters are not provided with a control switch and should be controlled by a magnetic contactor (integral or external) and a separately mounted thermostat. External contactor is not nec- essary with heaters having a model number suffixed with the letter “R”.

4.Protection against overheating is provided by an internal auto- matic thermal cutout which opens the electric circuit if the nor- mal air-flow is restricted or stopped. Cutout automatically energizes heater on removal of the obstruction.

WARNING: Users should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure may be severe, back-up controls are essen- tial. Although the safety of installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.

OPERATION

DANGER:

1.Do not restrict air-flow through the heater by placing fabric or other obstructions in front of or behind the heaters. With some combustible materials, the resulting high discharge tempera- tures could cause a fire.

2.This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liq- uids 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 elements.

1.Fan motors in these heaters are provided with sealed ball bear- ings, factory lubricated, requiring no further lubrication under normal service conditions.

2.Following long periods of idleness, heater should be vacuumed before start-up, to remove accumulated combustible particles which otherwise may smoke or incinerate on initial heat up.

3.Periodically inspect all electrical connections and terminals to avoid electrical wiring difficulties. Inspect all wiring for frayed or worn insulation.

WIRING DIAGRAMS

Figure 3

Use with:

UB-1002E 208V, 1Ø or 3Ø 240V, 1Ø 480V, 1Ø or 3Ø

UB-1252E

208V, 3Ø 240V, 3Ø 480V, 1Ø or 3Ø

UB-1502E

208V, 3Ø 240V, 3Ø 480V, 1Ø or 3Ø

UB-2002E

480V, 1Ø or 3Ø 240V, 1Ø or 3Ø

Control Source for	}
Separately Wired Motors		1 or 3 Phase, 60 Cycle
120 or 240 Volts, 60 Cycle
		Power Supply 208, 240
		or 480 Volts
		Heater
Fused	Fused
	Switch
Control Switch
	Contactor

	Ground
	This Wiring
	by Customer
	F1
	F2
	T1
Thermostat When Used	L1
	L2
	L3

1Ø Motor Heater Bank

Cutout

Wiring Comp't

Baffle

For 3 Phase Only