User Interface Display
C H
S E T T I N G S
C H
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t h e r m o s t a t ▼
C H
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APPENDIX A - CONTROL MODULE
4. Central Heating (CH) modes available:
•
CH Mode = 0 'CH with Thermostat'
•
CH Mode = 1 'CH with Thermostat and Outdoor Reset'
• CH Mode = 2 'CH with Full Outdoor Reset'
M O D E : 1
•
CH Mode = 3 'CH with Permanent Demand'
Note:
• Once CH demand is satisfi ed (i.e. CH thermostat opens or
boiler determines its minimum fi ring rate exceeds system
heating load):
• The internal heat exchanger pump is energized anytime demand
exists regardless of Pump Mode setting or type of demand (CH or
DHW).
67
Explanation
•
Boiler will attempt to satisfy CH demand while CH
thermostat input is closed.
•
Boiler will modulate its fi ring rate to maintain CH set
point and match system heat load.
•
CH set point adjusted in 'Settings' submenu under 'User
Menu'
•
Boiler will attempt to satisfy CH demand when CH
thermostat input is closed.
•
Boiler will modulate its fi ring 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 fi gure A-2
•
Boiler will permanently attempt to satisfy CH
demand.
•
CH thermostat input is ignored.
•
CH set point calculated as function of outdoor
temperature using outdoor reset curve. See fi gure A-2
•
Boiler will permanently attempt to satisfy CH
demand.
•
CH thermostat input is ignored.
•
CH set point is adjusted in 'Settings' submenu under
'User Menu'
•
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 fi res again. Prevents short-
cycling.