Calculate the SCFM.
Technical Information
Electrical Data: Connections and Wiring
Typical Heater Connection
Parallel
Cartridge Heaters are usually wired in a simple parallel connection. Heaters are rated at applied voltage.
Parallel (Single Phase)
Cartridge heaters may be wired in series.
- To reduce wattage in a system, two heaters rated at 240V wired in series will reduce the total wattage to 1/4 of its rated value when 240V is applied. Three similar heaters wired in series will reduce wattage to 1/9 of its rated value.
- For use at higher voltage - two 120V heaters wired in series for use on 240V, or two 240V heaters wired in series for 480V.
3 Phase Delta
The most commonly used method of making 3 Phase connections. The heaters are arranged in multiples of 3 for a balanced system.
Typical Wiring Diagrams
Single Phase
AC or DC Heater Circuit
Circuit with thermostat connected for half current load across each contact
Typical connections when line current exceeds thermostat rating
Three Phase
3 Phase
Typical connections when line current exceeds thermostat rating
Typical connection with ETR temperature control
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