INSTALLATION
ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property damage. Heater must be installed by a qualified person in accor- dance with the National Electrical Code, NFPA 70.
1.Vertical Mounting (Preferred)
When the heater is vertically mounted, the terminal housing will be at the top of the heater. The inlet pipe will be located on the side near the bottom of the heater and the outlet pipe at the top.
The axis of the chamber will be in a vertical position as in the photo on previous page and as in Figure A. Note: A drain pipe located at the bottom of the heater should be provided and enough room left, when mounting heater, to allow draining the heater.
2.Horizontal Mounting (Optional)
CAUTION: When mounting heater horizontally, inlet and outlet pipes must be up. In any other position, heater cannot be purged of air, and elements may be seriously damaged. (See Figure B)
3. Whether vertically or horizontally, the heater should be rigidly mounted so that vibration is at a minimum since excessive vibra- tion will result in erratic thermostat operation. The
4.By using a slotted mounting assembly on either of the lugs, the heater chamber will be permitted to expand with increasing tem- perature.
5.Provide adequate space at terminal to end permit withdrawal of the heater from chamber should servicing be required.
FIRE HAZARD. Since heaters are capable of develop- ing high temperatures, extreme care should be taken to:
A.Provide a minimum of 6” spacing from chamber and related piping to nearest combustible material.
B.Do not operate near combustible fluids or vapors.
FREEZE HAZARD. This unit is equipped with a ther- mowell for process control or
Correct
Incorrect |
Correct
Incorrect 
Figure A — Vertical Mounting
Figure B — Horizontal Mounting
WIRING
ELECTRIC SHOCK HAZARD. Any installation involv- ing electric heaters must be performed by a quali- fied person and must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.
1.Be sure line voltage matches heater voltage as shown on name- plate.
2.Electric wiring to heater must be installed in accordance with local and National Electrical Codes by a qualified person as defined in the NEC.
L3
L2
Contactor L1
Contactor
Contactor
3.Power controllers must be used when heaters are rated for 480 volt service or if the amperage rating of the heaters exceeds the contact rating of the thermostat.
4.Refer to Wiring Diagram Table B for the proper wiring diagram for connecting heater.
Wiring Diagrams – Table B
| 240V | 480V |
Model | Fig. | Fig. |
Any Heater | 1 | 2 |
|
|
|
L3
L2
L1
Contactor
Contactor
Contactor
Figure 1 – 240V
Thermostat
Figure 2 – 480V
Thermostat
Note: Dotted lines indicate “customer furnished.” However, thermostat may be furnished by Chromalox if so specified on the order.
