Hubbell ST - Manual (Page 27)

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c. Spence Valves: There is no main spring adjustment on Spence Valves. To set temperature
on the water heater:
(1) Turn pilot spring adjustment “A” clockwise until all tension is off the spring.
(2) Refer to unit start-up section and start unit except for thermostat setting.
(3) Turn spring adjustment “A” counter-clockwise until the wheel is firmly against the
spring.
(4) Continue to turn wheel “A” one 360° turn or until steam begins to pass thru the valve.
(5) Allow unit to heat until the valve closes off.
(6) If unit is not up to temperature at this point, continue to turn adjustment wheel ½ turn,
stop and allow valve to shut off.
(7) Repeat this cycle until unit is up to the desired temperature.