APPENDIX H – IQ Control System (continued)
IQ Option Cards:
A variety of IQ Option Cards are available to enhance the features of a standard boiler.
For example, if additional safety limits are required, select Manual or Automatic Reset Aquastat or Low Water Cutoff IQ Option Cards. Additionally, if energy savings and improved home comfort is desired, select an Outdoor Reset IQ Option Card.
Outdoor Reset IQ Option Card:
The Outdoor Reset IQ Option Card regulates hydronic heating system heat delivery rate to match the home heat demand and building heat loss. This is accomplished by continuously adjusting the boiler supply water temperature setpoint based on outside air temperature, domestic hot water demand and “sleep” or “leave” period selections, when a Honeywell EnviraCOM enabled programmable thermostat is connected.
Refer to the Outdoor Reset IQ Option Card instructions for additional information.
Aquastat IQ Option Card:
Benefits of the Outdoor Reset Card: Increased comfort through smooth, continuous, regulated heat delivery and reduced indoor air temperature fluctuations.
Energy Savings through:
(1)reducing room overheating
(2)reducing boiler temperature and
(3)increasing combustion efficiency
The Aquastat IQ Option Card provides electronic temperature sensing in a UL
The Aquastat IQ Option Cards are available in automatic or manual reset models. Automatic reset versions automatically reset when temperature return to safe levels. Manual reset
models require user intervention to reset a temperature condition after the temperature returns to safe levels.
Listings/Approvals:
•UL353 Limit Controls for both US (UL) and Canada
•UL 1998 Software Safety Standards as a Class 2 device.
Low Water Cutoff (LWCO) IQ Option Card:
The Low Water Cutoff (LWCO) IQ Option Cards are advanced devices that detect the absence of water in the boiler. LWCO IQ Option Cards use patented signal processing to identify when the probe signal levels have decreased due to fouling, permitting extended operation for probe impedances up to
40K Ohms. The LWCO IQ Option Cards function longer without requiring probe cleaning and can operate in the presence of foam.
Fully compliant with
The LWCO IQ Option Card is available with automatic and manual reset. Automatic reset
versions automatically reset when water levels return to safe levels. Manual reset models require user intervention to reset a low water condition after water levels return to safe levels. Manual reset models will not “lock out” upon power loss provided water still covers the probe when power returns.
Listings/Approvals:
•UL GUIDE (MBPR2) for Limit Controls per UL Standard 353 Limit
•UL GUIDE (MBPR8) Controls, Limit Certified for
C22.2
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