Chromalox PF451-3 specifications Installation

Table 2 - Electrical Data

				Power Supply Circuit					Contactor			Motor
								Minimum	Holding Coil
					Line	Line	No.		Volt Ampheres
Model	kW	Volts	Phase		Amps	Wire Size		Conduit	(Note 3)
							Circuits	Size †			Volts	H.P.	Phase
					(Note 1)	(Note 2)		(In.)	Inrush	Sealed
		208	3		43	6	1	1			208
VUH-C-15	15	240	3		37	8	1	1	52	9	240	1/6	3
		480	3		19	10	1	1/2			480
VUH-C-20	19.5	240	3		48	6	1	1	52	9	240	1/6	3
	20	480	3		25	8	1	3/4			480
VUH-C-25	25	480	3		31	8	1	3/4	52	9	480	1/6	3

Notes:

1.Includes Fan Motor Amps.

2.Use 75˚C Wire - Copper Conductors only.

3.Standard units have one contactor. Units with separate fan motor control use two contactors.

† Conduit knockout location - top of Junction Box.

IMPORTANT

Failure to understand and follow these installation instructions and the “WARNING” notes therein may result in serious per- sonal injury from electrical shock, or from the heater falling due to faulty installation.

WARNING: This heater is not recommended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmos- pheres are present as defined in the National Electrical Code. Failure to comply can result in explosion or fire. For these applications see Bulletin PDS CXH-EP (PF305).

WARNING: Hazard of Shock. Disconnect all power before installing heater.

The heater must be mounted at least 7’ above the floor to prevent accidental contact with the heating elements or fan blade which could cause injury.

The ceiling structure, the brackets, hangers or chains used to sus- pend the heater, and the anchoring provisions must be of sufficient strength to support the combined weight of the heater installation (85 pounds for VUH-C-15, 20, 25 plus the weight of the supports).

Prior to operating the heater verify that the fan hub setscrews are tightened and the push-on clip is secured to assure that the fan blade is securely fastened to the motor shaft.

On models connected to three-phase power, fan blade rotation must be checked. If airflow is not downward, interchange any two of the three customer power leads.

First stage of thermostat must be connected to terminals C1 and C2 to insure proper operation of overheat protective devices.

INSTALLATION

WARNING: Hazard of Shock. Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code.

1.Heater should be positioned with the junction box facing away from walls to provide easy access for servicing relay(s) mounted within.

WARNING: Mount the heater for down discharge only.

2.It is important that the 12” minimum dimension shown in Figure 1 be maintained to make it possible for a serviceman to remove the fan motor, if necessary, without moving the heater from its mounting.

WARNING: The heater must be mounted at least 7’ above the floor to prevent accidental contact with the heating elements or fan blade which could cause injury.

The ceiling structure, the brackets, hangers or chains used to sus- pend the heater and the anchoring provisions must be of sufficient strength to support the total weight of the heater installation (85 pounds for VUH-C-15, 20, 25 plus the weight of the supports).

3.The heater may be mounted to the ceiling by attaching rigid angle brackets, hangers, or chains to the four mounting holes on the top of the heater case using four 5/8” bolts (by others). See Figures 1 and 2.

Note: Brackets, hangers, or chains to support the heater are supplied by the customer.

4.All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person as defined in the NEC.

WARNING: Use Copper conductors only.

5.Rough-in wiring to heater. See Table 2 for line amperes, rec- ommended wire size and conduit size.

6.Wire heater per wiring diagram supplied with this instruction sheet.

Note: Power relay(s) are provided as standard on all heaters.

WARNING: Prior to operating the heater, verify that the fan hub setscrews are tightened and the push-on clip is secured to assure that the fan blade is securely fastened to the motor shaft.

7.Carefully inspect the completed installation. Rotate the fan blade by hand to be sure that it turns freely. Investigate any binding, rubbing or interference.

8.Air diffusers for deflecting the air are optional. See Instruction Sheet PF449 for Installation instructions.