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HI-LIMIT, red – this will only illuminate when the vessel hi-limit opens due to excessive high
water temperature. This hi-limit is self resetting.
PWR ON, green – basically this is illuminated at all times. It represents 24-volt power source,
good fuse, controller logic is operational, and a good outlet sensor. If the outlet sensor is
inoperative, incorrectly wired, or malfunctioning; this green monitor LED will be in the blinking
or pulsing mode (see page 11).
EL MODE, amber – when illuminated the system is in the electric mode. If it is not illuminated
the utility load control receiver is in the interrupt or on-peak mode. If there is an optional or
remote standby switch, the status of the standby switch is also monitored by this amber LED.
HEAT ON, red – indicates a remote switch closure (t-stat or zoning end switch) is closed between
terminals R and W.
Inside Controller Board
STAGES, red – these four LED's indicate which electric element stages are on and active.
Manual Reset, Hi-Limit
At the top of the vessel there will be either two or three surface mount hi-limits preset at 205° F. There is
no light indicator associated with these safety hi-limits. Also these 205° F safety limits break the L2
current carrying 240-volt wire going to the elements. Reset involves locating a small shiny lever or metal
tab protruding on the side of the black safety limit base. This small tab is pressed inward approximately
1/8" to "snap in" the contacts.
Safety caution – the wires and screws have 240-volt potential and can be dangerous. Turn off
circuit breakers before investigating or attempting to reset the 205° F safety limits.
Internal Fuse
The fuse on the controller board protects the transformer secondary, external items connected to "R", and
the circuit board itself. Replace with 2-amp fast blow, AGC2 or equivalent.
Stat Heat Anticipator - If it is a mechanical stat, verify heat anticipator has been set at Ø.2 (non-zone
system).
System Pressure
The side press/temp. gauge should be at approximately 10 to 16 PSI at room temperature water and
should not rise more than approximately 4 PSI at the operating or hot water temperature. If the pressure
change is more than approximately 4 PSI, the expansion tank is too small or there is a problem with the
expansion tank piping, expansion tank itself.
Cold slab, outdoor reset and temperature sensing prevent full boiler on – by adding a temporary
jumper between the lower W screw terminal and the upper left "E" tab, all temperature sensing functions
are bypassed and the control board will step in all the stages. Caution: This jumper shall not be a
permanent function, jumper needs to be removed after slab is approaching normal temperature.
Standby Switchover, SOT Timer
This plug-in option device allows a selection from 40 to 80 minute thermostat operating time for
automatic switchover to standby boiler. Order part number SOT-1.
03/19/2009
11
BI508
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