Circulator Exercising And Freeze Protection - Weil-McLain Series 2 Manual

® S
ERIES
DHW SETTINGS menu
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).
Figure 86
DHW SETTINGS menu (see Figure 78, page 70 for access information)
Menu/Item
Boiler Supply
On Diff
Off Diff
Max On Time
Prepump Time: ### SEC seconds
Postpump Time: ### SEC seconds
MAXIMUM BLOWER RPM
ECO 70
ECO 110HW *
ECO 110EBM
ECO 155
0,1,080 %/2:(5 530
ECO 70
ECO 110HW *
ECO 110EBM
ECO 155

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.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
Low High
Units
Value Value
°F 60 190
°F 2 10
°F 2 10
minutes off 240
0 240
off 240
RPM 1100 4300
RPM 1400 5650
RPM 1900 7850
RPM 1300 5500
4300
RPM 1100
RPM 1400 5650
RPM 1900 7850
RPM 1300 5500
— Boiler Manual
(continued)
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
Default
185 Boiler enters manual reset lockout at 200°F
5 Boiler turns on if temperature drops below target minus
differential on
5 Boiler shuts down if modulates past target plus differential off
30 Longest time boiler will satisfy DHW call before switching to HEAT
input (if present)
20 Additional time to run circulators longer than standard 10
second time
30 Circulator run time after call for heat ends
4150 %RLOHU 0RGHO VSHFL¿F
5450 127( $GMXVWLQJ ERLOHU ¿ULQJ UDWH ZLOO DIIHFW $)8( UDWLQJ
7550 * See Notice on page 71
5300
1100
%RLOHU 0RGHO VSHFL¿F ORZ YDOXH DGMXVWHG
1400 $/7,78'( LV VHOHFWHG LQ FRQWURO VHWXS
1900
127( $GMXVWLQJ ERLOHU ¿ULQJ UDWH ZLOO DIIHFW $)8( UDWLQJ
1300
* See Notice on page 71
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.
Comment
DXWRPDWLFDOO\ LI +,*+
75