Freestyle 2 Series - DHW Settings (Combi Only)

Part number 550-142-950/0122
67
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
28 DHW Settings (Combi Only)
Boiler must be set on comfort mode
DHW SETTINGS
1. e DHW SETTINGS menus are for setting control opera-
tion during DHW operation. e 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82,page63).
DHW TEMPERATURES
DHW priority — e FreeStyle® control gives prior-
ity to DHW operation. During DHW call for heat,
the central heating zone output is disabled. is
continues until the DHW call ends or the DHW
MAX ON TIME has elapsed which is 30 minutes.
BOILER SUPPLY
1. e FreeStyle
®
control will regulate boiler ring 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 91 Compensation parallel offset curves
Typical low temperature radiant application
such as in-oor tubing.
Figure 92 Compensation parallel offset curves, Typical
copper n tube /cast iron baseboard radiation.
27 Controls and operation
Figure 93 DHW SETTINGS menu (see below for setting
values and descriptions)
Rated
Heat
Input
DHW production rate
[MBH]
[GPM with
ΔT =30ºF]
[GPM with
ΔT =50ºF]
[GPM with
ΔT =70ºF]
[GPM with
ΔT =90ºF]
FS-80 4.7 2.8 2.0 1.6
FS-120 7.2 4.4 3.2 2.4
FS-155 9.2 5.6 4.0 3.1
Figure 94 DHW curve - FreeStyle 80
Adjustments for Heating Only Boilers
with Outdoor sensor
Figure 90 Compensation curves
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
Freestyle 80 - DHW PRODUCTION
Freestyle 80
Delta T (ºF)
G.P.M.
Starting temperature
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
7
8
9
10
Starting temperature