Section SPS 322.41 - Temperature control(1) GENERAL. Each system shall be provided with an adjustable thermostat for the regulation of temperature.(2) CIRCULATING HOT WATER SYSTEMS. Circulating hot water systems shall include an automatic or readily accessible manual switch to turn off the circulating pump when the system is not in use.(3) MERCURY THERMOSTATS. The installation of thermostats containing mercury is prohibited. Note: This section does not require the replacement of existing mercury-containing thermostats.
(4) HEAT PUMP SUPPLEMENTARY HEAT. Heat pumps having supplementary electric-resistance heat shall have controls that, except during defrost, prevent supplemental heat operation when the heat pump compressor can meet the heating load.Wis. Admin. Code Department of Safety and Professional Services SPS 322.41
CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09.