Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11R - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Residential › Section 51-11R-40310 - Section R4031-Controls

Current through Register Vol. 24-14, July 15, 2024
R403.1 Controls.
Not less than one thermostat
				shall be provided for each separate heating and cooling system.
R403.1.1 Programmable or connected thermostat.
Where the primary heating system is a forced-air furnace, at least one
				thermostat per dwelling unit shall be Energy Star certified and capable of
				controlling the heating and cooling system on a daily schedule to maintain
				different temperature set points at different times of the day and different
				days of the week. The thermostat shall allow for, at a minimum, a 5-2
				programmable schedule (weekdays/weekends) and be capable of providing at least
				two programmable setback/setup periods per day. This thermostat shall include
				the capability to set back, set up or temporarily operate the system to
				maintain
zone
temperatures down to 55°F (13°C) or up
				to 85°F (29°C). The thermostat shall be programmed initially by the
				manufacturer with a heating temperature set point of not greater than 70°F
				(21°C) and a cooling temperature set point of not less than 78°F
				(26°C). The thermostat and/or control system shall have an adjustable
				deadband of not less than 10°F.
EXCEPTIONS:
1. Systems controlled by an occupant sensor that is
						  capable of shutting the system off when no occupant is sensed for a period of
						  up to 30 minutes.
2. Systems controlled solely by a manually operated
						  timer capable of operating the system for no more than two hours.
3. Ductless mini-split heat pump systems that have an
						  integral proprietary thermostat.
R403.1.2 Heat pump supplementary heat.
Unitary air
				cooled heat pumps shall include controls that minimize supplemental heat usage
				during start-up, set-up, and defrost conditions. These controls shall
				anticipate need for heat and use compression heating as the first stage of
				heat. Controls shall indicate when supplemental heating is being used through
				visual means (e.g., LED indicators). Heat pumps equipped with supplementary
				heaters shall be installed with controls that prevent supplemental heater
				operation above 40°F. At final inspection the auxiliary heat lock out
				control shall be set to 35°F or less.
R403.1.3 Continuously burning pilot lights.
The
				natural gas systems and equipment listed below are not permitted to be equipped
				with continuously burning pilot lights.
1. Fan-type central furnaces.
2. Household cooking appliances.
EXCEPTION:
Household cooking appliances without electrical supply
						  voltage connections and in which each pilot light consumes less than 150
						  Btu/hr.
3. Pool
			 heaters.
4. Spa heaters.
5. Fireplaces.
EXCEPTION:
Any fireplace with on-demand, intermittent or
						  interrupted ignition (as defined in ANSI Z21.20) is not considered
						  continuous.
Statutory Authority:
				  RCW
				    19.27A.020,
				  19.27A.045 and
				  chapters
				  19.27 and
				  34.05 RCW. 13-04-055, §
				  51-11R-40310, filed 2/1/13, effective
				  7/1/13.