Specifications

Controls, Like No Other...
If the G3 heat exchanger is the brawn of the ES2 Boiler, the IQ Boiler Control System is
the brains. The IQ Control System has been specically designed for the next generation
of high efciency cast iron boilers. It simplies boiler operating controls by combining
all the typical boiler safety controls, including ignition, into one central control module.
LED readouts clearly communicate system status updates, and The end result is a
control system which is simple to read, simple to set up, and simple to diagnose.
The IQ Option Panel resides below the boiler control. The Option Panel permits the
addition of features to the boiler by way of genuine IQ Option Cards. These option
cards allow the “plug-n-play” installation of such features as Outdoor Reset, Low
Water Cutoff, and an auxiliary Aquastat. Thanks to the unique design of the IQ Option
Panel, installation of these boiler control upgrades are extremely easy for the qualied
technician to perform.
IQ Outdoor Reset Card – for Increased Energy Savings
A weather-sensitive control that adjusts the boiler temperature up or down based on
the outdoor air temperature. It’s a simple concept. On cooler days, a home requires
more heat to remain at a comfortable temperature inside. On these days, the boiler
temperature is automatically adjusted upward. By contrast, on warmer days, a home
requires less heat to maintain comfort, so the boiler temperature is adjusted down.
Adjusting the boiler temperature has several advantages. Often it allows the boiler
to operate at a lower temperatures , which enhances efciency and can deliver
savings of 15-20%. It maximizes the comfort of the heating system by allowing the
boiler to run for longer cycles at a steady temperature, minimizing wasteful on/off
cycling. Adding the benets of outdoor reset to the ES2 boiler is as simple as plugging
the Option Card into the IQ Option Panel and connecting a 2-wire sensor. Additionally,
the IQ Outdoor Reset Option Card contains many powerful features normally found only
on large stand-alone control packages, such as:
• SelectableDomesticHotWaterPriority
• Selectable&AdjustableDomesticPriorityProtection
• AdjustableDomesticSetpoint
• SelectableandAdjustableTemperatureBoost
All settings on the IQ Outdoor Reset Option Card can be customized for ideal
performance in any heating system.
This is the ONLY boiler that
takes real advantage of
outdoor reset control.
Because of the ES2’s exceptional G3 heat
exchanger, the ES2 boiler can safely handle
return water temperatures as low as 110°F,
which signicantly increases the system
efciency of most heating systems. Even
higher system efciencies can be achieved by
adding the IQ Outdoor Reset Card to the IQ
Boiler Control System in an ES2, resulting in
more fuel savings and improved comfort.
boiler
contr ol
option
panel
option
car d
control
system
Helps Improve Efciency,
Saving Energy and Money!
Chart Tit l e
70
75
80
85
90
95
10 0
100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F
Heating System Efficiency in Relationship to
System Return Water Temperature
70
75
80
85
90
95
100
100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F
Heating System Return Water Temperature
Heating System Efficiency
Å
Lower Hi
g
he
r
Æ
ES2
Outdo or
Reset
Typical Cast Iron Boilers require a
MINIMUM
return w ater temperature of
140°F
to prevent
flue gas condensation and heat exchanger
damage. This limits heating system ef ficiency.
Increased system efficiency
only
available with ES2 where
return water temperatures
can be as low as 110°F.
Typical
Cast Iron
Boilers
System Efficiency
wit h
Reset
Outdo o r
This is the only boiler that
takes real advantage of
outdoor reset control.
Because of the ES2’s exceptional G3
heat exchanger, the ES2 boiler can
safely handle return water temperatures
as low as 110°F, which significantly
increases the system efficiency of most
heating systems. Even higher system
efficiencies can be achieved by adding
the IQ Outdoor Reset Card to the IQ
Boiler Control System in an ES2,
resulting in more fuel savings and
improved comfort.