Install Instructions

DHW SETTINGS menu
&IGURE (%!4).'3%44).'3 menu (see Figure 71, page 66 for access information)
DHW SETTINGS
1. The DHW SETTINGS menus are for setting control operation
during DHW operation. The settings apply ONLY to $(7 Zone
(see Figure 78).
2. If DHW is used, the settings for control operation during DHW calls
for heat are set under the DHW SETTINGS menus (see Figure 78).
DHW TEMPERATURES
$(7PRIORITY — The ECO 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.
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1. The ECO 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.
-ENU)TEM Units
,OW
Value
(IGH
Value
$EFAULT #OMMENT
SUPPLY MAX
°F 60 190 180
Required supply temp. at system design max. load
SUPPLY MIN
°F 60 190 130
Minimum supply temp. for system
OD RESET MAX
°F 50 100 70
Outdoor temp. at which supply target reaches min.
OD RESET MIN
°F –20 50 0
Outdoor temp. at which supply target reaches max.
Modulate On Diff
°F 2 10 5
Boiler turns on if temperature drops below target minus differential on
Modulate Off Diff
°F 2 10 5
Boiler shuts down if modulates past target plus differential off
Min On Time
minutes off 240 30
Shortest time boiler will satisfy space heating system before
switching to DHW
Boost Interval
minutes off 240 off
When operating on ODR increases target 10°F when this time
expires until reaching MAX
Prepump Time: ### SEC
seconds 0 240 20
Additional time to run circulators longer than standard 10 second time
Postpump Time: ### SEC
seconds off 240 30
Circulator run time after call for heat ends
MAXIMUM BLOWER RPM
%#/
%#/ 110
%#/ 155
RPM
RPM
RPM
1100
1400
1300
4300
5650
5500
4150
5450
5300
Boiler Model specific
NOTE: Adjusting boiler firing rate will affect AFUE rating.
MINIMUM BLOWER RPM
%#/ 70
%#/ 110
%#/ 155
RPM
RPM
RPM
1100
1400
1300
4300
5650
5500
1100
1400
1300
Boiler Model specific (low value adjusted automatically if HIGH
ALTITUDE is selected in control setup)
NOTE: Adjusting boiler firing rate will affect AFUE rating.
&IGURE $(73%44).'3 menu (see
Figure 79, page 71 for setting values and
descriptions)
Part number 550-142-122/0513
70
TM
GAS-FIRED WATER BOILER — Boiler Manual
HEATING SETTINGS menu (continued)