8. Program the Controls (continued)
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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 , Down , 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
3.Press the Up and Down 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 five (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
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 flow 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 efficiency to your heating system. The IQ Option Panel provides an easy and convenient means to
For installation, programming, and troubleshooting instructions, refer to the instructions supplied with those cards.
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