10/22/2008
7
BI302B
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.
24Ø volt element power current flow can be measured when the external operating thermostat is calling for heat.
There are no delays.
Assumes off-peak mode.
3.
The operating thermostat heat call can be verified by the
red
LED marked “Mini-Boiler heat on” located on front
cover.
4.
The 160° (71° C) hi-limit is automatic reset.
5.
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.
6.
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.
7.
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.
8.
Check for water leaks and repair as required.
9.
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”.
