User Guide
Part number 550-100-325/0718
64
AquaBalance
®
SERIES 2 WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
Figure 91 DHW curve - AquaBalance
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120 Figure 92 DHW curve - AquaBalance
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155
27 DHW Settings (Combi Only) (continued)
0
0.5
1
1.5
2
2.5
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9
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11
11.5
12
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100105
AquaBalance 120 - DHW PRODUCTION
G.P.M.
Delta T (ºF)
AquaBalance 120
0
0.5
1
1.5
2
2.5
3
3.5
4
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15
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Freestyle 155 - DHW PRODUCTION
Freestyle 155
Delta T (ºF)
G.P.M.
AquaBalance 155
AquaBalance 155 -
The “D” Parameter codes below are part of the normal Control Operation and typically appear during Start Up.
This a “Timed” or “Auto Recycle” event.
• D1….the boiler is / has finished the call for Domestic Water heating, and is in the transition to either
standby mode or central heating mode.
• D2….the boiler has reached the required water set point, and the firing has stopped / with a call for Cen-
tral Heating still applied by the T-Stat to the boiler. Circulators will continue to operate and the boiler is
monitoring the two internal water sensors (return & discharge) waiting for a water “Delta-T” to return…at
that time the boiler will re-fire if need be.
• D3….the boiler has made 3 tries for ignition and has failed to ignite. A re-trial ignition cycle / delay is in
effect for 3 more tries to ignite/restart boiler operation.
Parameter Description
D1
After cycle of Domestic water mode, D1 will be displayed.
D2
When required boiler water set - point is reached D2 will be displayed.
D3
After an attempt for ignition, re-trial ignition delay is in effect (D3 is displayed).
* Check for proper fuel supply.
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* Insure condensate is draining properly.
* Insure venting size and length are correct and unobstructed.