Bell & Gossett P86272B VS Variable Speed Pump Control - Manual (Page 9)

9
OPERATION
OUTPUT LIGHT
The output light has the following three indications:
Light Off
• The heating system is not active. Neither the Secondary
loop pump nor the Injection pump output are active.
Light On
• The heating source output is active. The Secondary loop
pump relay is energized, and the speed of the Injection
pump is being controlled.
Flashing
• The Secondary loop pump relay is energized to circulate
the water through the loop. The Injection pump output is
not active. This would occur when there is a call for heat,
but the temperature of the Secondary loop is satisfied so
none of the hot water from the Primary loop is needed in
the Secondary loop.
DEFAULT DISPLAY INDICATORS
The Display when not used will display the temperature of the
secondary loop. The display has the following indications:
Right Decimal Point Light
• Decimal point indicator located on the right hand side of the
right most digit of the LED display in the default display
mode will light to indicate the system is in the Setback/
Boost mode.
Left Decimal Point Light
• Decimal point indicator located on the left hand side of the
left most digit of the LED display in the default display
mode will light to indicate the Return is below the Low
Return Temperature.
OUTDOOR CUTOFF (Warm Weather Shut Down)
The Outdoor Cutoff (COF ) is the outdoor temperature below
which the Secondary loop pump will be activated to circulate
water through the loop and the Injection pump speed will be
regulated to control the temperature of the Secondary loop
water. When the outdoor temperature rises above this point,
the Secondary Pump relay (BLACK wires) and the Injection
pump output (RED wires) will be off. The Outdoor Cutoff (COF )
is adjustable from 40°F to 100°F with a default of 60°F. The
Outdoor Cutoff (COF ) also has two special modes:
OFF
• When the Outdoor Cutoff (COF ) is set to OFF, neither the
Secondary loop pump nor the Injection pump will run. This
can be used for testing or to disable heat to the particular
loop. Do not use this feature to turn off pumps for mainten-
ance. For this, use the safety disconnect.
ON
• When the Outdoor Cutoff (COF ) is set to ON, the Secondary
loop pump will run regardless of outdoor temperature. The
Injection pump speed will be regulated to control the
temperature of the Secondary loop water temperature.
Follow the chart on pg. 8 to adjust the Outdoor Cutoff (COF ).
System is in
Setback or Boost Mode
Return is below
Low Return Temperature
• •