05/21/2009 10
BI501
CONTROLLER SETUP
Temperature set point
– the front red “knob” allows for field or user setting of the outlet water
temperature. The built-in sensor and controller will attempt to regulate the electric element stages around
this set temperature. The smallest staging increment is 4.5 kW; therefore, there will some fluctuation
around this set point. Field setting the outlet temperature at the design or realistic temperature required
by the radiation is more efficient.
The front panel allows selection of the operating temperature. The table below should coincide with the
decal on the front panel.
Circulator pump mode
– as factory set, the circulator pump is controlled directly from the “W” input
terminal. In this setup the circulator pump continues during load control interrupt (or optional remote
standby switch). There is a provision within the controller board (inside) to allow the circulator pump to
not operate during load control interrupt.
On the inside control board, just above the two bottom
terminal blocks, is a small pin jumper arrangement. The
black “device” sets up the pump mode. Just below this pin
jumper arrangement are W and L lettering. When the two
pin shorting device is in the W position, the pump is a
direct function of R to W input. When the two pin jumper
is in the L position, the pump is interrupted during a load
control.
WARNING:
This shorting device must be in one of the two positions for the circulator pump to properly
operate.
OPERATIONAL TIPS
Heating Cycle
1.
External R to W contact closure.
2.
Assume the load control receiver device (or remote option standby switch) is in the off-peak or
non-interrupt mode. This is verified by the front panel amber LED being illuminated.
3.
Circulator pump starts.
4.
30-second plus delay before staging lights or element relays close. This delay allows the pump to
circulate the system water past the outlet water temperature sensor and allows the controller logic
to determine how many elements to energize. If the water temperature is greater than the set
point, elements will not come on.
Monitor Lights, Front Panel
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).