STP SERIES Install, Operation, and Maintenance Manual
SECTION 3: OPERATION AND CONTROLS
Rev-1
Diversified Heat Transfer, Inc.
•
439 Main Road, Route 202
•
Towaco, New Jersey 07082
Page
27
of
97
STP Manual
PHONE: 800-221-1522
•
WEBSITE: www.dhtnet.com
09/11/2019
•
Before shipment, every unit is inspected to make sure the pump speed is varying with
respect to signal from the controller.
•
Pump is powered by 200-240V/1ph/60Hz electricity (field supplied) and power consumption
is 0.027-0.75HP (20 – 650 W).
•
Flow is controlled through pump by 4 to 20 mA signal from the controller.
o
4mA means pump is in fully closed position and no flow through pump (fail safe feature).
o
20mA means pump is in full speed operation (full flow through pump)
3.6.2 Operating modes
Includes following easy to set operating mode options:
o
Constant speed – 3 modes
o
Constant pressure – 4 modes
o
Proportional Pressure
o
0-10V
o
2-Pump Alteration
WARNING!
The pump is factory set to 0-10V operation and should remain in this mode for proper
operation of the unit. Unit controls include conversion from 4-20mA signal to 0-10V mode
operation for this option.
3.6.3 Pump Installation
Piping assembly spool piece is included with the unit to make connection with heat exchanger
and pump. Use nuts and bolts to attach companion flanges to the pump flange for field side
piping connection. Gaskets are included with the pumps. Ensure flange bolts are adequately
torqued.
NOTE:
Pump can be installed with the motor shaft in the horizontal or vertical position with the control
module facing up. Cover can be rotated independent of the pump to adjust orientation of the
user interface.
FIGURE 3-9: VFD Pump with Flange Connections
ACCEPTABLE
UNAUTHORIZED
