Bell & Gossett P86272B VS Variable Speed Pump Control - Manual (Page 8)

8
◆ These are sensor readings. They can not be adjusted.
◆◆ The display of each setting will remain active for approximately 20 seconds after the last adjustment. Then the display will revert to the default reading.
◆◆◆ These options are available with Reset Mode only. Select r from Startup menu.
◆◆◆◆ These options are available with Return Sensor Mode only. Select rS from Startup menu.
DISPLAY VALUES and ADJUSTMENTS
Press SELECT
DISPLAY Press and hold either the UP or DOWN button to adjust
Button
Once
OUt This is the temperature of the outdoor sensor. If it does not read correctly, check the
Outdoor Temp ◆ Troubleshooting guide.
This is the temperature of the water returning to the boiler. If this sensor is not installed
Twice ◆◆◆◆
ret it will display OPn. If the sensor is installed and does not read correctly, check the
Return Temp ◆ Troubleshooting guide. Available only when the Return Sensor (rS ) is selected from the
Startup menu.
SP
This is the Set Point the Secondary Loop is to maintain. Available only when the Set
3 Times
Set Point
Point (S ) is selected from the Startup menu. It is adjustable from 100° to 180°F with
a default value of 120°F.
3 Times ◆◆◆
CAL This is the Set Point temperature calculated using the Outdoor Reset logic. Available
Calculated Temp ◆ only when Reset (r ) is selected from the Startup menu.
COF
This is the outdoor temperature below which the VS will activate the Secondary loop
Outdoor Cutoff
pump and control the variable speed pump. If the ON setting is selected, the VS will
4 Times
(warm weather)
activate or control both pumps regardless of outdoor temperature. If the OFF setting is
shut down)
selected, the VS will never activate either pump. It is adjustable from 40° to 100°F with
a default value of 60°F.
The higher the curve number selected, the faster the temperature of the Secondary loop
5 Times ◆◆◆
rSt will be increased as outdoor temperature decreases. Available only when Reset (r ) is
Reset Ratio selected from the Startup menu. (For Reset Curves see Figure 6.) It is adjustable from
1 to 12 with a default value of 7.
OFS
The Offset will adjust the calculated Secondary loop temperature (determined by the
6 Times ◆◆◆
Offset
outdoor temperature, Reset Ratio and Setback) by the amount displayed. Available only
when Reset (r ) is selected from the Startup menu. Adjustable ±40°F.
This is the number of degrees the Secondary loop water temperature will be lowered if
7 Times
Sbc the VC is put into Setback. In addition, this amount will be added to the Secondary loop
Setback water temperature when control is in Boost (switching from Setback to normal operation)
for a full hour. It is adjustable from 0 to 30 with a default value of 10.
GAn
The Gain controls how aggressively the VS will change the pump speed when the
8 Times
Gain
Secondary loop temperature is away from the Calculated Temp or the Set Point. It is
adjustable from -10 to +10 with a default value of 0.
9 Times ◆◆◆◆
LOr With Return Water Sensor: Set to the boiler manufacturer’s specification for minimum
Low/Min Return boiler return temperature. It is adjustable from 70° to 170°F with a default value of 70°F.
This is the highest Secondary loop water temperature the VS will maintain. Available
10 Times ◆◆◆
HI only when Reset (r ) is selected from the Startup menu. It is adjustable from 100°F to
Hi Supply Temp 200°F with a default value of 160°F.
IMPORTANT: The VS is not a safety control. All appropriate safety controls must be installed.
11 Times SEC This is the temperature reading of the Secondary loop sensor. If it does not read correctly,
Default ◆◆ 2nd Loop Temp ◆ check the Troubleshooting guide.
Push to
Display settings
Output Light
Indicates Status
Secondary Loop Sensor
Outdoor Sensor
Red
Push these buttons to adjust
the control settings
Digital Display defaults to read
Secondary Loop Temperature
Injection Pump
Output
Secondary Loop
Pump Output
120 VAC
Power Input
Boiler Return Sensor
Setback or remote
Enable or Disable Input
DRY CONTACT ONLY
Black
Blue
FIG. 5