Variable Speed Flow Control (V.s.p.c.) System - Bradford White Brute MagnaTech BMGV1600 Installation And Operation Instructions Manual

Page 74
9.10 Variable Speed Flow Control
(V.S.P.C.) System
V.S.P.C. is a variable pump control that is standard
equipment on all boilers. Pump speed is controlled
to maintain a user-chosen temperature rise between
General PCB Operation
1. The desired Delta T can be set to any of the
following values by moving or adding jumpers to the
2. As shipped, the V.S.P.C. has a jumper on the
JP4 terminal, to operate a 0-10 VDC output. If a
4-20 mA output is needed, move the jumper to the
JP5 terminal. Figure 44
V.S.P.C. can operate in °F or °C. A jumper
3.
on the JP1 terminal allows the user to choose the
temperature scale.
10K
OUTLET
SENSOR
10K
INLET
SENSOR
DIGITIZED
P/N E2345200
LED1
TB1
Figure 44. V.S.P.C. Digital Circuit Board
TB2
TB5
TB4
PCB
1 2
3 4
5 6
7 8
JP3
JP1
7&8 = F
1&2 = SPARE JUMPER
6
and runs the pump output at 100% (10 VDC, or 20
mA).
5. Once the Main Gas valve is energized the PCB
will maintain pump output at 100% for 60 seconds
to allow the system to stabilize. Once the 60 second
timer has expired, the PCB will then run the pump
output speed based on the jumper setpoint. .
at 100% output for the duration of the pump overrun
time.
PCB will allow the variable speed pump control to
operate in degrees Fahrenheit or Celsius. (Factory set
for Fahrenheit).
8. The V.S.P.C. PCB has a low end cap to
programmed to 2 VDC.
-Degrees - Fahrenheit
-Output Signal- 0 -10VDC
-Delta T setpoint - 30 °
TB3
1
2
3
4
JP5
1
JP4
2
3
TB6
JP2
1&2 = 15 DEG F / 8 DEG C
3&4 = 20 DEG F / 10 DEG C
5&6 = 25 DEG F / 13 DEG C
7&8 = 30 DEG F / 16 DEG C
°C
4-20MA(+)
4-20MA(-)
0-10VDC(+)
0-10VDC(-)
2
N/O
COM
N/C
FIRMWARE SETTINGS
P = 20
I = 10
D = 0
ANTI RESET WINDUP = 600
CONTROL ERROR = 70