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Features
- A SPDT Transformer Relay with a 20A, 115V supply, can operate the Vacuum Pump and a maximum of 9 Burners in a One-Zone (one Thermostat) System
- A DPDT Transformer Relay with a 20A, 115V supply, can operate the Vacuum Pump and up to 9 Burners in a Two-Zone (two Thermostats) System
Example using Single Stage Thermostat Control
Single Stage, Two Zone Control

- Two Single-Stage thermostats are used
- The Burners are divided in two zones
- Each zone responds to its thermostat independently
- Both zones may be ON or OFF at the same time
Example using Two Stage Thermostat Control
Two Stage, Single Zone Control

- One Two-Stage Thermostat is used
- All Burners respond to one thermostat and are either HI, LOW or OFF at the same time