08/07/2008 7
BI301D
Figure 1
OPERATIONAL TIPS
1.
Indicator lights – there is a set of four indicator lights on the lower right corner of the front cover with an
identical set of four indicator lights on the internal circuit board itself. Figure 1 is a reproduction of the front
decal giving definition and information for using these indicator lights. Note the statement that there must be a
call for heat before attempting to interpret the indicator lights.
2.
The 160° (71° C) hi-limit is automatic reset.
3.
The 205° (96° C) hi-limit is manual reset and under the cover, located on the
vessel top, left.
Warning
: This 205° (96° C) manual reset controls the 240 power to the
elements. Therefore, open the boiler disconnect prior to removing cover
and prior to attempting to reset this limit. Note: Reset tab is brass in color
and located on the side of the hi-limit.
4.
Via a small pin jumper arrangement on the control board, the circulator pump
can be a direct function of the “W” input
or
interrupted by the load control
device (even though there is a W input). This diagram illustrates this pin
jumper arrangement. This unit is factory setup in the “W” position meaning the
pump will always run as a direct function of “R” to “W” operating thermostat.
By simply moving this black 2-position jumper to the “L” the pump will be
turned off during load control interrupt.
5.
At outlet temperatures of approximately 120
°
F (53° C), the maximum system pressure should be
approximately 18 PSI (124 kPa). If the PSI (or kPa) increase from cold water to operating hot water is more
than approximately 3 to 4 PSI (20.6 to 27.5 kPa), the expansion tank is too small.
6.
Check for water leaks and repair as required.
7.
If flow seems to be a concern, determine both inlet and outlet water temperature and apply GPM (L/min)
formula detailed in previous section “Information/Water Flow Calculations”.