ON DIFF
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.
OFF DIFF
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
MAX ON TIME
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)
Figure 86
DHW SETTINGS
menu (see Figure 78, page 70 for access information)
CIRCULATOR EXERCISING and FREEZE PROTECTION
CIRCULATOR EXERCISING
1. The
ECO
control will automatically start both circulator
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.
PRE PUMP TIME
1. The DHW circulator will start this amount of time before the
burner is started.
POST PUMP TIME
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 550-142-190/1218
75
Menu/Item
Units
Low
Value
High
Value
Default
Comment
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
ECO
70
ECO
110HW
*
ECO
110EBM
ECO
155
RPM
RPM
RPM
RPM
1100
1400
1900
1300
4300
5650
7850
5500
4150
5450
7550
5300
! "
*
See Notice on page 71
##! $%& &'
ECO
70
ECO
110HW
*
ECO
110EBM
ECO
155
RPM
RPM
RPM
RPM
1100
1400
1900
1300
4300
5650
7850
5500
1100
1400
1900
1300
( )
+, -#:-
$#!; <
! "
*
See Notice on page 71
®
S
ERIES
2
G
AS
-
FIRED
WATER
BOILER
—
Boiler Manual
