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Unit Display
OR
Sample
Display
1 sec
1 sec
1 sec
Please note that in operating mode to hold the
display on the value the user can press and hold
either the Up ñ or Down ò keys and the value
will be continuously shown. This may be helpful in
watching a value “live”.
Changing the Adjustable Parameters
To adjust the High Limit setpoint, High Limit
Differential or Pump Overrun time settings or
setting the display for either °F or °C temperature
readings:
1. Access the adjustment mode by pressing
and holding the Up ñ, Down ò, and “I”
keys simultaneously for three (3) seconds.
This procedure is intended to discourage
unauthorized changes or accidental changes
to limit settings.
2. Press the "I" key to display available
Adjustment Mode options. Select an option.
Adjustment Mode Options
HL_ Adjust High Limit Setting
dF_ Adjust High Limit Differential
Or_ Pump Overrun Time (minutes)
rst Reset Lockout
f-C Select degrees F or C Mode
bac Back to Operating Mode
3. Press the Up ñ and Down ò keys to adjust
the displayed setpoint to the desired value.
4. To return to the normal operating mode
from the Adjustment Mode, when the "bAc”
option is displayed, press either the Up ñ or
Down ò key. If no keys are pressed, after
ve (5) minutes the IQ Boiler Control will
automatically return to the Operating Mode.
More Information about Adjustable Parameters
1. High Limit (HL_)
The IQ Control is factory programmed
8. PROGRAM THE CONTROLS (continued)
with a High Limit Setpoint of 180°F. The
boiler turns "off" when the supply water
temperature is above this value. The High
Limit setpoint is adjustable between 130°
and 220°F. The Operating Setpoint (SP) will
equal the High Limit Setpoint unless an IQ
Outdoor Reset IQ Option Card is installed.
The Outdoor Reset IQ Option Card reduces
the Operating Setpoint to regulate heat
delivery, increase home comfort and
save energy. Refer to the Appendix H for
additional information.
2. Differential (df_)
The IQ Boiler Control is factory programmed
with a Differential of 15°F. The Differential
is the number of degrees the supply
temperature must decrease below the
Operating Setpoint before the boiler can
restart. The differential is adjustable
between 10° through 30°F.
3. Pump Overrun Time (OR_)
The IQ Boiler Control is factory programmed
with a Pump Overrun Time of 0 minutes.
Pump Overrun Time (also called “off delay”
or “post purge”) continues pump operation
after a call for heat has ended, sending
excess heat from the boiler into the priority
zone. Ensure system piping and zone panel
settings allow water ow to the priority zone
after the call for heat ends. The Pump
Overrun Time is adjustable between 0
through 10 minutes.
Using the IQ Option Panel
IQ Option Cards are available from Burnham
distributors and are the simplest way to add
functionality, safety and efciency to your heating
system. The IQ Option Panel provides an easy and
convenient means to "plug-in" an Auxiliary High
Limit, Low Water Cut-off and/or Outdoor Reset
function.
For installation, programming, and troubleshooting
instructions, refer to the instructions supplied with
those cards.