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User Interface Display
Explanation
CH Settings
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
demand, 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-
cycling.
• The internal heat exchanger pump is energized anytime demand
exists regardless of Pump Mode setting or type of demand (CH or
DHW).
APPENDIX A - CONTROL MODULE
Содержание 075 97gb
Страница 44: ...44 13 TROUBLE SHOOTING ...
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Страница 61: ...61 14 WIRING DIAGRAM 14 1 Connection Diagram ...
Страница 62: ...62 14 WIRING DIAGRAM 14 2 Schematic Diagram of Ladder Form ...
Страница 78: ...78 NOTES ...
Страница 79: ...79 Company Address Phone Company Name Tech Initials Service Performed Date ...