installation &
operating instructions
Design Envelope 4200h & 4280
End Suction Horizontal Pumping Units
36
5.6 quadratic curve control with
maximum flow protection
This configuration is ideal for hvac hydronic systems where
pumps are generally oversized and a flow limit is required for
system equipment stability and resulting energy savings. This
control will take advantage of the 5.4 Quadratic Curve Con-
trol mode, where the pump will decrease speed to maintain
a maximum flow setting. This will prevent over-pumping and
save energy costs. Over-pumping is common in hvac systems
as pumps are typically oversized for the application. Pump con-
trols can only control the flow to a minimum speed; thus a dry-
contact relay is supplies which will close when maximum flow
is reached, which can be used for an alarm or other device.
0
0
20 40 60 80 100
200
400
600
800
1000
1200
120 140 160 180
target curve
Maximum Flow Setting
5.7 quadratic curve control with
minimum & maximum flow protection
This control mode combines the control logic of 5.5 & 5.6 which
takes the values of the quadratic control curve and protection
for both the maximum & minimum flow limits. Pump controls
can only control the flow to the motor limit or maximum / mini-
mum speed limits of the unit, thus a dry-contact relay is sup-
plies which will close when either the minimum or maximum
flow is reached, which can be used for an alarm or other device.
0
0
20 40 60 80 100
200
400
600
800
1000
1200
120 140 160 180
target curve
Minimum & Maximum
Flow Settings
5.8 parallel sensorless pump control
(pspc)
This configuration maps the quadratic control curve into the
pump controls and ensures the system flow requirements are
met, while staging the pumps on and o to maintain optimum
pump energy usage. This is accomplished by operating the
pumping units at the best pumping eciency level for the
required flow.
This control is available for 2, 3, or 4 Design Envelope pump
units operating in parallel. Tango and dualArm units have Paral-
lel Sensorless Pump Control (pspc) pre-programmed in the
controls at Armstrong factories. For all other models (except
twin pumps), pspc can be enabled aftermarket; please contact
your local Armstrong factory for details.
1-pump
1p e 2p e 3p e 4p e
2-pumps
3-pumps
4-pumps
pspc control curve
5.8.1 parallel sensorless pump control for
multiple single pumps
If the Parallel Sensorless Pump Control option was purchased
for control of 2 single pumps (VILs and End Suctions), the func-
tion can be enabled at any time. Note that the pumps must the
same model for proper parallel operation.
Start by installing a wiring bridge between the two pumps (sup-
plied by others). The wiring required between the two control
cards is a CANbus (3-wire) cable with terminal blocks at each
end (3 position strain 3.81mm).
Wiring bridge (supplied by others)
g
g
A = + Positive
B = - Negative
G = Ground
A = + Positive
B = - Negative
G = Ground
From the Webserver, choose Settings -> Pump, set control
mode to Parallel with the following parameter values:
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