Product Overview
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MPO-IQ
Installation & Service Manual
IQ Control System Overview
MPO-IQ Boiler uses a microprocessor based control system called the "IQ Control System". This "IQ Control System"
consists of an IQ Oil Boiler Control in conjunction with an Oil Primary Control and an IQ Option Panel with optional "plug-
in" IQ Option Cards. The IQ Control System fully integrates both factory and field installed components, simplifying
installation and troubleshooting. IQ Control System is designed to efficiently operate the entire boiler system to save
energy and installation and setup time, while ensuring adequate supply of heat and domestic hot water.
The IQ Option Panel works together with the IQ Oil Boiler Control to provide an easy and convenient means to "plug-in"
an Auxiliary High Limit, Low Water Cut-off, and/or Outdoor Reset functions.
The Manual Reset Low Water Cutoff and High Limit IQ Option Cards are CSD-1 compliant, which simplifies installations
in areas where CSD-1 is enforced. IQ Option Cards snap onto the IQ Option Panel supplied on all MPO-IQ boilers and
feature Plug n' Play connections.
IQ Oil Boiler Control: P/N 103851-01
The IQ Oil Boiler Control replaces the familiar Honeywell L7248 electronic Aquastat and contains several additional
features. These unique features allow the IQ Oil Boiler Control to connect the boiler's control system together in a way
that was not previously possible, greatly simplifying set-up and troubleshooting of the boiler.
IQ Option Card Major Features
• Plug-’n-play connection to MPO-IQ Boilers, only wiring required is to field installed sensors
• Status and error codes displayed on built-in 3-digit display
• Optional LCD touch screen display can also be used to read status and make adjustments
• Error codes can be displayed on EnviraCOM-enabled programmable thermostat
• Built-in diagnostics
• U.S. Boiler Company factory engineered and tested as part of a complete system
LED display provides the following information:
- Boiler Status - Standby, pre-purge, post purge, trial
for ignition, running, etc.,
- Diagnostics - CAD cell resistance, run time hours
and cycle counts
- Error Monitoring - Including primary control and
connected IQ Option Cards
(Note: Primary control information is only available
when an EnviraCOM enabled primary is connected)
• Outdoor Air Reset Ready - Operating Setpoint is
automatically adjusted by outdoor air temperature
and heat demand type when an Outdoor Air Reset IQ
Option Card is connected. Also, Operating Setpoint
is adjusted by thermostat “sleep” and “leave” modes
when a setback EnviraCOM enabled
thermostat is connected.
• Warm Start Ready - boiler is started and circulator
is stopped when the boiler is cold and an external
low limit is connected.
• Smart Circulator Pre-purge - Upon a call for heat the
circulator is started and the boiler start is delayed.
The boiler is started without delay if the boiler is cold
or there is a DHW demand. Boiler cycling and
resulting standby loses are reduced by adjusting
the circulator pre-purge time.
• "Energy Banking" Pump Overrun Time - The system
circulator may be run after the call for heat has ended
to “move” residual heat in the boiler to the system or
indirect water heater.
• Second Configurable Pump Output - In addition to the
system pump output the control has a second pump
output and associated input that may be configured
for Domestic Hot Water or second zone demand and
pump control. This second output eliminates the
need for an external relay for DHW pump control or
the need for a zone panel used for a two zone home.
• Boiler System Display - well-known electronic aquastat 3-digit
Appendix A - Oil Burner IQ Control System