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/.$)&&
1. The temperature must drop this many degrees below
target temperature for the boiler to come on when a
call for heat is present on DHW input.
/&&$)&&
1. While the boiler is firing, as the temperature increases
above the target temperature, the boiler firing rate is
reduced.
2. At this many degrees above the target temperature, the
control will temporarily turn off burner. The burner will
be restarted when temperature drops below TARGET
TEMPERATURE minus ON DIFF.
DHW TIMES
-!8/.4)-%
1. This is the longest time the boiler will continue in DHW
mode before switching to space heating (if there is a
space heating call).
DHW SETTINGS menu (continued)
&IGURE $(73%44).'3menu (see Figure 71, page 66 for access information)
-ENU)TEM Units
,OW
Value
(IGH
Value
$EFAULT #OMMENT
Boiler Supply °F 60 190 185 Boiler enters manual reset lockout at 200°F
On Diff °F 2 10 5 Boiler turns on if temperature drops below target minus
differential on
Off Diff °F 2 10 5 Boiler shuts down if modulates past target plus differential off
Max On Time minutes off 240 30 Longest time boiler will satisfy DHW call before switching to HEAT
input (if present)
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
%#/70
%#/ 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.
CIRCULATOR EXERCISING and FREEZE PROTECTION
CIRCULATOR EXERCISING
1. The ECO control will automatically start both circula-
tor outputs and run for 10 seconds for each 72-hour
period of inactivity.
Setting MAX ON TIME to off will cause the control to
never switch to space heating while DHW call for heat
is present. This could present a freeze hazard for some
installations if the DHW aquastat were to remain closed
indefinitely.
02%05-04)-%
1. The DHW circulator will start this amount of time before the
burner is started.
0/3405-04)-%
1. The DHW circulator will continue to run this amount of time
after the burner is shut down when the call for heat is satisfied.
MIN / MAX BLOWER RPM
1. Use to set minimum and maximum boiler inputs by setting
minimum and maximum blower RPM.
2. Adjusting the MAX BLOWER RPM down will reduce DHW
performance
FREEZE PROTECTION
1. This function automatically fires the boiler and starts the HEAT
circulator when the heat exchanger sensor detects a temperature
less than 40 °F. The circulator turns off when the temperature
rises above 45 °F.
Part number 550-142-122/0513
71
TM
GAS-FIRED WATER BOILER — Boiler Manual
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