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APPENDIX H – IQ Control System (continued)
IQ Option Cards:
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.
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.
Outdoor Reset IQ Option Card:
Benets of the Outdoor Reset Card: Increased
comfort through smooth, continuous, regulated
heat delivery and reduced indoor air temperature
uctuations.
Energy Savings through:
(1) reducing room overheating
(2) reducing boiler temperature and
(3) increasing combustion efciency
Aquastat IQ Option Card:
The Aquastat IQ Option Card provides electronic
temperature sensing in a UL limit-rated control with
a single sensing probe. The Aquastat IQ Option
Card replaces auxiliary high limits such as the
L4006.
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
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 CSD-1 requirements for water
level controls.
The LWCO IQ Option Card is available with
automatic and manual reset. Automatic reset
Low Water Cutoff (LWCO) IQ Option Card:
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 Controls–Component
• UL GUIDE (MBPR8) Controls, Limit Certied
for Canada–Component per CSA Standard
C22.2
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 (CUL)—Component Recognized
• UL 1998 Software Safety Standards as a
Class 2 device.
A variety of IQ Option Cards are
available to enhance the features of
a standard boiler.