User Guide

Part number 550-100-325/0718
63
AquaBalance
®
SERIES 2 WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
27 DHW Settings (Combi Only)
Boiler must be set on comfort mode
Figure 87 Compensation parallel offset curves
Typical low temperature radiant application
such as in-floor tubing.
Figure 88 Compensation parallel offset curves
Typical Copper fin tube /cast iron baseboard radiation.
26 Controls and operation
Adjustments for Heating Only Boilers
with Outdoor sensor
Figure 89 DHW SETTINGS menu (see below for setting
values and descriptions)
DHW production rate
Boiler
Model
[GPM with
ǻ7 )@
[GPM with
ǻ7 )@
[GPM with
ǻ7 )@
[GPM with
ǻ7 )@
AB-80 4.7 2.8 2.0 1.6
AB-120 7.2 4.4 3.2 2.4
AB-155 9.2 5.6 4.0 3.1
DHW SETTINGS
1. The DHW SETTINGS menus are for setting control opera-
tion during DHW operation. The settings apply ONLY to
DHW Zone.
2. If DHW is used, the settings for control operation during
DHW calls for heat are set under the DHW SETTINGS menus
(Figure 78, page 59).
DHW TEMPERATURES
DHW priority — The control gives priority to DHW
operation. During DHW call for heat, the central
heating zone output is disabled. This continues
until the DHW call ends or the DHW MAX ON
TIME has elapsed which is 30 minutes.
BOILER SUPPLY
1. The control will regulate boiler firing to provide outlet water
at this temperature.
2. For most DHW applications, set this to 190°F. A lower supply
temperature can be used, but will reduce the indirect water
heater heating capacity.
Figure 90 DHW curve - AquaBalance
®
80
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
AquaBalance 80 - DHW PRODUCTION
Delta T (ºF)
G.P.M.
AquaBalance 80
Figure 86 Compensation curves
68
86
104
122
140
158
176
194
-42814202632384450566268
BOILER FLOW TEMPERATURE (°F)
OUTSIDE AIR TEMPERATURE (°F)
OTC CURVES
1
2
3
4
5
6
78910
2))6(7 
2))6(7 
Starting temperature