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APPENDIX A - CONTROL MODULE
User Interface Display
4. Central Heating (CH) modes available:
• CH Mode = 0 'CH with Thermostat'
• Boiler will attempt to satisfy CH demand while CH thermostat
input is closed.
• Boiler will modulate its firing rate to maintain CH set point
and match system heat load.
• CH set point adjusted in 'Settings' submenu under 'User
Menu'
• CH Mode = 1 'CH with Thermostat and Outdoor Reset'
• Boiler will attempt to satisfy CH demand when CH
thermostat input is closed.
• Boiler will modulate its firing rate to maintain CH set point
and match system heat load.
• CH set point calculated as function of outdoor
temperature using outdoor reset curve. See Figure A-2
• CH Mode = 2 'CH with Full Outdoor Reset'
• CH demand is determined by outdoor temperature and
Warm Weather Shutdown temperature.
• Boiler will permanently attempt to satisfy CH
when CH demand is available.
• CH thermostat input is ignored.
• CH set point calculated as function of outdoor
temperature using outdoor reset curve. See Figure A-2
• CH Mode = 3 'CH with Permanent Demand'
• CH demand is prermanently on.
• Boiler will permanently attempt to satisfy CH
demand.
• CH thermostat input is ignored.
• CH set point is adjusted in 'Settings' submenu under 'User
Menu'
Note:
• Once CH demand is satisfied (i.e. CH thermostat opens or boiler
determines its minimum firing rate exceeds system heating
load):
• Burner shuts off, boiler enters post purge.
• CH pump continues to run for 30 seconds.
• Control will wait until Anti-cycle time of 180 seconds elapses
before boiler fires again. Prevents short-
• The internal heat exchanger pump is energized anytime demand
exists regardless of Pump Mode setting or type of demand (CH or
DHW).
82
Explanation
PN 240011320 Rev. G 10/01/2021]
demand,
cycling.
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