Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
OMM-0095_0H
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
35
of
144
GF-139
Phone: 800-526-0288
09/15/2017
Installing the Pressure Relief Valve and Other Components
– Continued
3. Connect the following components to the tapped holes in the manifold assembly, as shown
in Figure 4-6, above:
•
Flow Switch
•
Pressure/Temperature Gauge
NOTE:
It is important to ensure that the flow switch be installed with the “flow” arrow pointing in the
direction of the flow.
4. On
older
models only, also install the 1-1/2” Pressure Relief Valve to the third tapped hole
in the CSD-1 manifold assembly, as shown in Figure 4-6, above.
5. Check to ensure that all components are securely tightened and that the flow switch
paddle moves freely without interference.
6. Locate the BMM module with the “FL” label (Figure 4-7), and remove the black jumper
wire from the terminals of the connector shown in the detail of Figure 4-7. Connect the two
flow switch wires to the two terminals. Flow switch wires have no polarity, so can be
inserted without regard to position.
Figure 4-7: BMM Location and Flow Switch Connection
4.13 DETERMINATION OF PRIMARY BOILER PUMP OR BOILER SYSTEM
PUMP
The following table gives an indication of the pump’s flow rate in function of the
∆t
of the
primary circuit if the installation has a mixing header.
The size of the pumps must be determined by installers or technical engineers according to
boiler data and system design.
Remove this black jumper and
insert the two wires from the flow
switch into terminal connector.
DETAIL
Terminal Connector
