Per Thermostat - Schwank SPW2-JZ Series Installation & Owner's Manual

18. WIRING DIAGRAM: 24V 2-STAGE THERMOSTAT CONTROL
Each tube heater requires 120V, 60 HZ electrical power sized for 145VA. The heater includes
a 24V/120V relay switch . Maximum power flow for internal 24V burner components is 21VA.
The heater must be electrically grounded in accordance with the National Electrical Code. AN-
SI / NFPA 70 or current Canadian Electrical code CSA C22.1.
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
SINGLE HEATER PER THERMOSTAT
(Multiple Heaters per Thermostat—next page)
Two-Stage Thermostat
MUST have sequence
OFF-ON (Low)-ON (high)
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